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Preprint ARTICLE | doi:10.20944/preprints202306.0457.v1

Novel Arrangement for Pin-Fin Heat Sinks for Improves the Optimization of Thermal Dissipation

Juan Pablo Ramirez, Martin Nieto

Subject: Engineering, Mechanical Engineering Keywords: Heat sinks; Global thermal resistance; Pressure drop; Nusselt number; Fin- deflectors; Computational Fluid Dynamics (CFD)

Online: 6 June 2023 (12:06:56 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.0374.v1

Layout Dependence Stress Investigation In Through Glass via Interposer Architecture Using Submodeling Simulation Technique and Factorial Design Approach

Shih-Hung Wang, Wensyang Hsu, Yan-Yu Liou, Pei-Chen Huang, Chang-Chun Lee

Subject: Engineering, Mechanical Engineering Keywords: Multi-chiplet; TGV; Finite element analysis; Submodeling technique; Analysis of variance

Online: 6 June 2023 (04:06:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.0271.v1

The Potential of Replacing Concrete with Sand and Recycled Polycarbonate Composites: Compressive Strength Testing

Morgan C. Woods, Apoorv Kulkarni, And Joshua M. Pearce

Subject: Engineering, Mechanical Engineering Keywords: waste plastic composites; poly carbonate; polycarbonate composite; sand; plastic and sand composites; plastic sand bricks; concrete; construction; compressive strength; mechanical properties

Online: 5 June 2023 (10:00:49 CEST)

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Preprint REVIEW | doi:10.20944/preprints202306.0266.v1

A Comparative Analysis of Two-Phase Flow Boiling Heat Transfer Coefficient and Correlations for Hydrocarbons and Ethanol

Mohamed ElFaham, Clement C. Tang

Subject: Engineering, Mechanical Engineering Keywords: Flow boiling; Heat transfer coefficient; Two phase flow; hydrocarbons; Ethanol; Flow boiling correlations

Online: 5 June 2023 (08:21:06 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.0222.v1

Film Boiling Around a Finite Size Cylindrical Apecimen - A Transient Conjugate Heat Transfer Approach

Alen Cukrov, Yohei Sato, Ivanka Boras, Bojan Ničeno

Subject: Engineering, Mechanical Engineering Keywords: low Biot number material; conjugate heat transfer; film boiling; large-scale domain; turbulent flow; Kelvin-Helmholtz instability; frozen turbulence approach

Online: 2 June 2023 (16:40:35 CEST)

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The DNS of film boiling requires strong computational resources that are difficult to obtain for a daily CFD use by the practitioners of the industrial R&D experts. On the other hand, the film boiling experiments are associated with the usage of the expensive and highly sophisticated apparatus, and the research to this end is found to be relatively difficult due to high heat flow rates that are present in the process itself. When combined with a transient heat conduction in a solid, the problem becomes significantly difficult. Therefore, a novel method in computation of conjugate heat transfer during film boiling in a quiescent liquid has been proposed in this paper. The method relies on the solution of mass, momentum and energy conservation equations in a two-fluid framework, supplemented with the appropriate closures. Furthermore, the turbulent flow has been found as an important parameter in obtaining the accurate solution of the temperature field evolution in a solid specimen, via the proper modeling of turbulent kinetic energy (TKE) value, that has been imposed as a constant value, i.e., the frozen turbulence approach. It was found, in addition, that the appropriate TKE value can be obtained by use of Kelvin-Helmholtz instability theory in conjunction with the boundary layer theory. The obtained results show excellent agreement with the experimental data within the first 15 s of the experiment, i.e., the first ca. 10 % of the total duration of the film boiling mode of heat transfer. Furthermore, the heat transfer coefficient has matched the error bands prescribed by the authors of the paper that has presented the correlations, whilst the averaged values are far beyond this band, i.e., are slightly more than 30 % higher. The further inspection has revealed a measure of similarity between the computational result of the volume fraction field distribution and the experiment, thus confirming the capability of the method to obtain realistic interface evolution in time. The method has shown full capability for further pursuing the industrial-scale film boiling problems that involve turbulent flow and the conjugate heat transfer approach.

Preprint ARTICLE | doi:10.20944/preprints202306.0173.v1

Improving Pure Titanium's Biological and Mechanical Characteristics through ECAP and Micro Arc Oxidation Processes

Dawit Bogale Alemayehu, Masahiro Todoh, J. H. Hsieh, Chuan Li, Song-Jeng Huang

Subject: Engineering, Mechanical Engineering Keywords: Pulp cell; Periodontal cell; Micro-Arc Oxidation (MAO), Sever Plastic deformation (SPD), Equal Channel Angular Pressing (ECAP), AlamarBlue; ELISA; trypsin

Online: 2 June 2023 (10:01:53 CEST)

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Preprint REVIEW | doi:10.20944/preprints202306.0172.v1

Gels that Serve as Mucus Simulants: A Review

Appu Vinod, Rafael Tadmor, David Katoshevski, Ephraim Gutmark

Subject: Engineering, Mechanical Engineering Keywords: Mucus; synthetic hydrogels; polymers; gel networks

Online: 2 June 2023 (09:57:48 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.0044.v1

Adaptively Lightweight Spatiotemporal Information Extraction Operator-Based DL Method for Aero-Engine RUL Prediction

Junren Shi, Jun Gao, Sheng Xiang

Subject: Engineering, Mechanical Engineering Keywords: RUL prediction; spatiotemporal information, aero-engine, deep learning

Online: 1 June 2023 (07:17:18 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.2123.v1

Lagrange-Kirchhoff Model for curvature of Circular Silicon Plate, Annular Silicon Plate and Taiko Silicon Plate

Antonio Landi

Subject: Engineering, Mechanical Engineering Keywords: Taiko wafer deformation

Online: 30 May 2023 (11:18:53 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1449.v2

Design and Analysis of a Typical Vertical Pressure Vessel using ASME Code and FEA Technique

Kristaq Hazizi, Mohammad Ghaleeh

Subject: Engineering, Mechanical Engineering Keywords: pressure vessel:; ASME code; optimum design; working pressure; structural analysis; finite element method; autodesk inventor professional

Online: 30 May 2023 (03:04:41 CEST)

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As the demand for liquefied petroleum gas (LPG) continues to increase worldwide, more LPG facilities are being constructed. However, the design and manufacture of pressure vessels used to store dangerous liquids or pressurised fluids, such as LPG, has been a major cause of hazards, including explosions and leakage. In this study, we aim to address this issue by designing and analysing a vertical pressure vessel with a capacity of 10 m3 of pressurised LPG in accordance with the American Society of Mechanical Engineers (ASME) code. Safety is the primary concern in designing pressure vessels due to the potential risks posed by accidents. Therefore, the main objective of this project is to design a pressure vessel that is safe from failure. The vessel is cylindrical with two elliptical heads, two nozzles, a manway and four leg supports, and we used Autodesk Inventor Professional 2023 for geometric modelling and Inventor Nastran for FEA analysis. To investigate the displacements, deflections and Von-Mises stresses in the pressure vessel, we used the finite element method, and Autodesk Inventor Nastran was employed for the analysis. Our results showed that changes to the structure of the pressure vessel were needed to reduce stress in the structure. Specifically, the displacement showed an inverse relationship with the tank section shell thickness. Moreover, we observed that the factor of safety increased linearly with shell thickness. We carefully considered permissible pressures and determined the required wall thickness to ensure acceptable maximum stresses. Our results indicate that the design is safe from failure, and the highest stresses are experienced by the manway followed by the shell, while the heads, nozzles and legs support experienced the lowest stresses. We also performed a theoretical calculation for the entire model and checked the results to ensure they were within the acceptable limits. In summary, our study highlights the importance of designing pressure vessels in accordance with ASME codes to ensure safety and prevent hazards caused by improper design and manufacturing. By using the finite element method, we identified potential stress points in the pressure vessel and were able to make modifications to improve its safety.

Preprint ARTICLE | doi:10.20944/preprints202305.2018.v1

Tribocorrosion Behaviour of γ’-Fe4N Nitride Layer Formed on Mild Steel by Plasma Nitriding in Chloride Containing Solution

Yong Sun, Richard Bailey

Subject: Engineering, Mechanical Engineering Keywords: nitriding; iron nitride; wear; corrosion; tribocorrosion; mild steel

Online: 29 May 2023 (13:51:50 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1866.v1

A Novel Approach for Reducing Feature Space Dimensionality and Develop a Universal Machine-Learning Model for Coated Tubes in Cross Flow Heat Exchangers

Mahyar Jahaninasab, Ehsan Taheran, S. Alireza Zarabadi, Mohammadreza Aghaei, Ali Rajabpour

Subject: Engineering, Mechanical Engineering Keywords: Computational heat transfer; Coating; Feature combination; Machine learning; Heat-exchangers

Online: 26 May 2023 (05:38:40 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1729.v1

Optimization of Electron and Hole Transport Layer to Model A Lead-Free Inorganic Cs₃Bi₂I₉Based Perovskite Solar Cell and Investigating the Effects of Different Attributes on Device Performance

Arnob Das, Sujan Banik, Barun K. Das, Nurul Islam

Subject: Engineering, Mechanical Engineering Keywords: Perovskite solar cell; Lead-free Cs3Bi2I9; HTL; ETL; Fill factor; PCE

Online: 25 May 2023 (03:47:38 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1670.v1

Effect of Diffusion and Laser Pulse on a Poro-Thermoelastic Medium via Three-Phase-Lag Model

Mohamed Abdelsabour Fahmy, Mohamed I. A. Othman, Elsayed M. Abd-Elaziz

Subject: Engineering, Mechanical Engineering Keywords: Three-phase-lag model; Laser pulse; Diffusion; Voids; Normal mode analysis

Online: 24 May 2023 (02:39:07 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1599.v1

Corrosion Failure Analysis of Duplex Stainless Steel Used as Shell and Tube Heat Exchanger with Seawater as the Cooling Medium

Husaini Ardy, Thomas Albatros, Afriyanti Sumboja

Subject: Engineering, Mechanical Engineering Keywords: Microbial Induced Corrosion; Failure Analysis; Heat Exchanger Failures; Crevice Corrosion; Seawater Corrosion

Online: 23 May 2023 (07:41:01 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1561.v1

Research of the Pre-processing Strategy Influence on the Tribological Properties of PEI Processed by Fused Filament Fabrication Technology.

Gerhard Mitaľ, Ivan Gajdoš, Emil Spišák

Subject: Engineering, Mechanical Engineering Keywords: PEI; FFF; path generation strategy; abrasive wear

Online: 23 May 2023 (04:22:52 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1457.v1

A Quantitative Examination of the Efficiency of a Biogas-Based Cooling System in Rural Regions

Kenan SAKA

Subject: Engineering, Mechanical Engineering Keywords: Efficiency analysis; biogas-powered cooling system; energy and exergy analysis; small-scale plant; absorption cooling system; triple-effect; ECOP; animal species; methane content

Online: 22 May 2023 (03:43:46 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1449.v1

Design and Analysis of a Typical Vertical Pressure Vessel using ASME Code and FEA Technique

Kristaq Hazizi, Mohammad Ghaleeh

Subject: Engineering, Mechanical Engineering Keywords: pressure vessel:; ASME code; optimum design; working pressure; structural analysis; finite element method; autodesk inventor professional

Online: 19 May 2023 (16:30:24 CEST)

Show abstract| Download PDF| Share

As the demand for liquefied petroleum gas (LPG) continues to increase worldwide, more LPG facilities are being constructed. However, the design and manufacture of pressure vessels used to store dangerous liquids or pressurised fluids, such as LPG, has been a major cause of hazards, including explosions and leakage. In this study, we aim to address this issue by designing and analysing a vertical pressure vessel with a capacity of 10 m3 of pressurised LPG in accordance with the American Society of Mechanical Engineers (ASME) code. Safety is the primary concern in designing pressure vessels due to the potential risks posed by accidents. Therefore, the main objective of this project is to design a pressure vessel that is safe from failure. The vessel is cylindrical with two elliptical heads, two nozzles, a manway and four leg supports, and we used Autodesk Inventor Professional 2023 for geometric modelling and Inventor Nastran for FEA analysis. To investigate the displacements, deflections and Von-Mises stresses in the pressure vessel, we used the finite element method, and Autodesk Inventor Nastran was employed for the analysis. Our results showed that changes to the structure of the pressure vessel were needed to reduce stress in the structure. Specifically, the displacement showed an inverse relationship with the tank section shell thickness. Moreover, we observed that the factor of safety increased linearly with shell thickness. We carefully considered permissible pressures and determined the required wall thickness to ensure acceptable maximum stresses. Our results indicate that the design is safe from failure, and the highest stresses are experienced by the manway followed by the shell, while the heads, nozzles and legs support experienced the lowest stresses. We also performed a theoretical calculation for the entire model and checked the results to ensure they were within the acceptable limits. In summary, our study highlights the importance of designing pressure vessels in accordance with ASME codes to ensure safety and prevent hazards caused by improper design and manufacturing. By using the finite element method, we identified potential stress points in the pressure vessel and were able to make modifications to improve its safety.

Preprint ARTICLE | doi:10.20944/preprints202305.1401.v1

Coarse and Fine Two-Stage Calibration Method for Enhancing the Accuracy of Inverse Finite Element Method.

Jiewei Lu, Dahang He, Zhenyi Zhao, Hong Bao

Subject: Engineering, Mechanical Engineering Keywords: inverse finite element method; Shape sensing; Single-objective particle swarm optimization; Error correction model; Bayesian; Residual analysis; Fuzzy network

Online: 19 May 2023 (08:00:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1400.v1

Influence of Tool-base Metal Interference on the Performance of Aluminum-Magnesium Alloy Joined by Bobbin Tool Friction Stir Welding

Sebastian Balos, Danka Labus Zlatanovic, Nenad Kulundzic, Petar Janjatovic, Miroslav Dramicanin, Zorana Lanc, Miodrag Hadzistevic, Slobodan Radisic, Dragan Rajnovic, Milan Pecanac

Subject: Engineering, Mechanical Engineering Keywords: bobbin tool; friction stir welding; interference; mechanical properties

Online: 19 May 2023 (07:53:58 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1384.v1

Analysis of Tool Wear in GH4169 Material Milling Process

Xueguang Li, Wang Zhang, Liqin Miao, Zhaohuan Pang

Subject: Engineering, Mechanical Engineering Keywords: Tool wear; Prediction model; Ultrasonic vibration; Coated cutting tools; Tool temperature

Online: 19 May 2023 (05:26:01 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1301.v1

Identification of Geometric Features of the Corrugated Board Using Images and Genetic Algorithm

Maciej Rogalka, Jakub Krzysztof Grabski, Tomasz Garbowski

Subject: Engineering, Mechanical Engineering Keywords: corrugated board; flute; flute type; cross-section image; genetic algorithm

Online: 18 May 2023 (08:32:06 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1249.v1

Influence of Body Heat Loss on Temperature and Velocity Fields in a Whole-Body Cryotherapy Chamber

Rim Elfahem, Bastien Bouchet, Boussad Abbes, Guillaume Polidori, Fabien Beaumont

Subject: Engineering, Mechanical Engineering Keywords: Computational Fluid Dynamics (CFD); Whole body cryotherapy (WBC); skin temperature; extreme cold; human body

Online: 17 May 2023 (12:39:36 CEST)

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Preprint REVIEW | doi:10.20944/preprints202305.1235.v1

Development and Evaluation of Mechanical Harvesting of Root Crops and Its Performance Optimization

Zheng Gong, Yuwan Yang

Subject: Engineering, Mechanical Engineering Keywords: Root crops; Evaluation; Mechanical harvesting; Optimization

Online: 17 May 2023 (10:41:36 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1211.v1

Navigation and Control of Motion Modes with Soft Microrobots for Drug Delivery at Low Reynolds Numbers

Gokhan Kararsiz, Yasin Cagatay Duygu, Zhengguang Wang, Louis William Rogowski, Sung Jea Park, Min Jun Kim

Subject: Engineering, Mechanical Engineering Keywords: Magnetic Manipulation; Microrobotics; Non-Newtonian Fluid; Swarm Control

Online: 17 May 2023 (08:38:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1207.v1

Experimental and Numerical Analysis of Crack Propagation of the Tensile Composite Plate with the Hole

Pawel Wysmulski

Subject: Engineering, Mechanical Engineering Keywords: crack propagation; XFEM; thin-walled structures; tensile analysis; laminates; finite element method

Online: 17 May 2023 (08:15:17 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1147.v1

Investigation of ASHRAE Global Thermal Comfort Database II and its Impact on the Development of Effective Passive Design Systems

Nyasha Bema, Bertug Ozarisoy

Subject: Engineering, Mechanical Engineering Keywords: ASHRAE; climate change; passive cooling; thermal comfort; thermal sensation

Online: 16 May 2023 (10:06:20 CEST)

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A variety of factors ranging from ethnicity and occupants’ lifestyles to local climatic characteristics of any studied location and people’s age factors can affect thermal comfort assessment globally. Due to the detrimental impact of climate change, the building industry has started to implement energy efficiency schemes while considering the thermal comfort of vulnerable population both for the society and any sphere of economy. Although, considering human-based approaches have been neglected by other scholars in thermal comfort studies. This paper reviews energy effectiveness of state-of-the-art passive systems in providing neutral adaptive thermal comfort for elderly people, through exploring passive design strategies in four distinct climates namely, Canada, India, Abu Dhabi and the South-eastern Mediterranean basin. The aim of the study is to analyze the available data provided by the ASHRAE Global Thermal Comfort Database II version record 2.1. The main objective of the study is to develop an effective methodological framework for the on-going development of adaptive thermal comfort theory. To this extend, this study presents a comprehensive review on the assessment of energy effectiveness of passive design systems. To accomplish this, the impact of climate change factor in passive design systems was investigated. The meta-analysis method was adopted to determine the input variables for the statistical analysis. Cramer’s V and Fisher’s Exact tests were used to assess occupants’ thermal sensation votes (TSVs). The findings revealed that there are discrepancies detected between the in-situ field experiments and the data recorded in the ASHRAE Global Thermal Comfort Database II. According to the Köppen-Geiger climate classification, it was found from the study that the slightly high temperature fluctuations were identified in India where the weather is dry and savanna climate. The study findings contribute to the development of adaptive thermal comfort theory by reviewing the existing methodologies globally. Furthermore, a critical review on the significance of occupants’ age differences should be conducted in the identification of neutral adaptive thermal comfort.

Preprint ARTICLE | doi:10.20944/preprints202305.1016.v1

Thermal Convection in a Heated-Block Duct With Periodic Boundary Conditions by Element-by-Element Treatment

Tswen-Chyuan Jue, Horng-Wen Wu, Ing-Chien Hsueh, Zhi-Wei I Guo

Subject: Engineering, Mechanical Engineering Keywords: heat transfer enhancement; heated-block channel; mounting rectangular cylinders; periodic boundary conditions

Online: 15 May 2023 (10:11:58 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0834.v1

I.C. Engine Conversion for Hydrogen Combustion and Near Zero NOx Emissions

Nils Monney, Leo Kurz, Simon Gillioz, Christian Nellen

Subject: Engineering, Mechanical Engineering Keywords: H2ICE; Hydrogen; Ultra-low NOx; Engine conversion

Online: 11 May 2023 (09:09:14 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0698.v1

Research on Swing Model and Fuzzy Anti Swing Control Technology of Bridge Crane

Zhen YU, Ming Hao DONG, Ming Chang LIU

Subject: Engineering, Mechanical Engineering Keywords: Bridge crane; Anti-sway strategy; Mathematical model of swing angle; Fuzzy controller

Online: 10 May 2023 (07:29:30 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0626.v1

Nonlinear Dynamic Response of Nanocomposite Microbeams Array for Multiple Mass Sensing

Giovanni Formica, Walter Lacarbonara, Hiroshi Yabuno

Subject: Engineering, Mechanical Engineering Keywords: Nanocomposite; microcantilever; mass sensing; frequency shifts; carbon nanotubes; nonlinear frequency response

Online: 9 May 2023 (09:36:54 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0619.v1

Digital Twins and Data-driven in Plant Factory: An Online Monitoring Method for Vibration Evaluation and Transplanting Quality Analysis

Kaikang Chen, Yanwei Yuan, Bo Zhao, Liming Zhou, Kang Niu, Xin Jin, Shengbo Gao, Ruoshi Li, Hao Guo, Yongjun Zheng

Subject: Engineering, Mechanical Engineering Keywords: Digital twin; data-driven; plant factory; transplanting; online monitoring

Online: 9 May 2023 (08:59:04 CEST)

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Plant Factory Transplanter (PFT) is a key component of the plant factory system. Its operation status directly affects the quality and survival rate of planted seedlings, which in turn affects the overall yield and economic efficiency. To monitor the operation status and transplanting quality of a transplanting machine in a timely manner, the primary task is to use a computerized and easy-to-use method to monitor the transplanting units. Inspired by the latest developments in augmented reality and robotics, a DT model-based and data-driven online monitoring method for plant factory transplanting equipment is proposed. First, a data-driven and virtual model approach is combined to construct a multi-domain digital twin of the transplanting equipment. Then, taking the vibration frequency domain signal above the transplanting manipulator and the image features of the transplanting seedling tray as input variables, the evaluation method and configuration method of the PFT digital twin system are proposed. Finally, the effect of the transplanter is evaluated, and the cycle can be repeated to optimize the transplanter to achieve optimal operation parameters. The results show that the digital twin model can effectively use the sensor data to identify the mechanical vibration characteristics and avoid affecting transplanting quality due to mechanical resonance. At a transplanting rate of 3000 plants/h, the transplanting efficiency can be maintained at a high level and the vibration signal of X, Y, Z-axis above the transplanting manipulator is relatively calm. In this case, Combined the optimal threshold method with the traditional Wiener algorithm, the identification rate of healthy potted seedlings can reach 94.3%. Through comprehensively using the optimal threshold method and 3D block matching filtering algorithm for image threshold segmentation and denoising, the recognition rate of healthy seedlings has reached over 96.10%. In addition, the developed digital twin can predict the operational efficiency and optimal timing of the detected transplanter, even if the environmental and sensor data are not included in the training. The proposed digital twin model can be used for damage detection and operational effectiveness assessment of other plant factory equipment structures.

Preprint ARTICLE | doi:10.20944/preprints202305.0546.v1

Optimizing the Thermal Spray Parameters for Producing High-Performance Mo/ZrB2 Metal Matrix Composites Using the Taguchi Method

Muftah Montaser Mihoob Ahmed, Dher Mohammed Albarody, Faiz Ahmed, Mohamad Alnarabiji

Subject: Engineering, Mechanical Engineering Keywords: flame spray; coating parameters; spraying distance; molybdenum; zirconium diboride

Online: 8 May 2023 (15:02:13 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0471.v1

Improving Sensitivity of Ferrous Particle Sensors with Permanent Magnet

Sung-Ho Hong

Subject: Engineering, Mechanical Engineering Keywords: ferrous particle; permanent magnet; oil sensor; sensitivity

Online: 8 May 2023 (08:35:00 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0466.v1

Design and Performance Analysis of a Torsional Soft Actuator Based on Superelastic Materials

Zhengyun Xu, Haiqiang Liu, Weihua Feng, Huaming Yang, Xin Nie, Rougang Zhou

Subject: Engineering, Mechanical Engineering Keywords: soft actuator; modular design; machine vision; flexible clamping technology

Online: 8 May 2023 (08:21:53 CEST)

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Preprint REVIEW | doi:10.20944/preprints202305.0450.v1

Varnish Formation and Removal in Lubrication Systems: A review

Sung-Ho Hong, Eun Kyung Jang

Subject: Engineering, Mechanical Engineering Keywords: varnish; lubricant; contamination; degradation; oxidation

Online: 8 May 2023 (05:04:38 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0447.v1

Improving Surface Wear Resistance of Polyimide by Inserting KH550 Grafted GO

Chen Liu, Jingfu Song, Gai Zhao, Qingjun Ding

Subject: Engineering, Mechanical Engineering Keywords: polyimide; Molecular dynamics simulation; tribology; graphene oxide

Online: 8 May 2023 (04:53:07 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0417.v1

A New Type of Misaligned Journal Bearing with Flexible Structure

Woo-Ju Jeon, Sung-Ho Hong

Subject: Engineering, Mechanical Engineering Keywords: elastohydrodynamic lubrication (EHL); flexible structure; minimum film thickness; misaligned journal bearing

Online: 6 May 2023 (10:28:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0410.v1

Influence of Ion Nitriding on Microstructure and Properties of Haynes 282 Nickel Alloy Specimens Produced using Additive Technique

Ryszard Sitek, Krzysztof Kulikowski, Krystian Paradowski, Kamil Gancarczyk, Akira Kobayashi, J. Moneta, Janusz Kamiński

Subject: Engineering, Mechanical Engineering Keywords: Haynes 282 nickel alloy; Additive manufacturing; Ion nitriding, Corrosion resistance, Microstructure, Static tensile test.

Online: 6 May 2023 (10:09:13 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0370.v1

Free-edge Effect on the Tensile Properties of 3D Woven Composites

Zengwen Wu, Ce Li, Feng Liao, Gang Liu, Shan Zeng

Subject: Engineering, Mechanical Engineering Keywords: 3D woven composites; damage; edge-effect

Online: 5 May 2023 (14:09:00 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0342.v1

An Insect-Scale Four-Winged Robot Designed by Flexure Hinge

Jiaxin Zhao, Weiping Zhang, Chaofeng Wu, Guangping Wu

Subject: Engineering, Mechanical Engineering Keywords: FWMAV; four-winged; flexure hinge; robotic

Online: 5 May 2023 (10:00:51 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0318.v1

Determination of the Equivalent Thickness of a Taiko Wafer using ANSYS Finite Elements Analysis

Vincenzo Vinciguerra, Giuseppe Luigi Malgioglio, Antonio Landi, Marco Renna

Subject: Engineering, Mechanical Engineering Keywords: Taiko Wafers; Finite Elements Analysis (FEA); ANSYS thermomechanical simulations

Online: 5 May 2023 (07:36:04 CEST)

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The successful handling of large semiconductor wafers is crucial for scaling up their production. Early-stage warpage control allows to prevent undesirable asymmetric warpage, known as wafer bifurcation or buckling. Indeed, even in a gravity-free environment, thinning an 8" or 12" semiconductor wafer can result in warpage and bifurcation. To mitigate this issue, the taiko method, which involves creating a thicker ring region around the rim of the wafer, has been widely used. Previous research has focused on the theoretical factors affecting the warpage of a backside metalized taiko wafer. This work extends the case to a front-side metalized taiko wafer and introduces the concept of the equivalent thickness of a taiko wafer. The equivalent thickness of a taiko wafer, influenced by the ring region, lies in between the thickness of the central region and that of the annular region. Because of the limited number of taiko wafers that can be produced on a production line, modelling can be beneficial. In this work we compared the results of a developed analytical model with those obtained from a finite element analysis (FEA) approach with ANSYSY® software to model the equivalent thickness of a taiko wafer. We investigated the curvature as a function of the stress of the metal layer, considering key design factors such as the substrate region thickness, the thickness of the thin metal film, the step height, and the width of the ring region. By systematically varying the thickness of the central region of the taiko wafer, we explored the curvature as a function of stress induced by thermal load in the linear regime and determined the slopes in the linear region of the curvature vs. stress curves. The aim of this study is to identify regularities and similarities with the Stoney equation and investigate the validity of the analytical approach for the case of a taiko substrate. It results that there is a good agreement between the analytical model of a taiko wafer and the numerical analysis gained by the FEA methods.

Preprint ARTICLE | doi:10.20944/preprints202305.0297.v1

Transparent Pneumatic Tactile Sensors for Soft Biomedical Robotics

Sinuo Zhao, Chi Cong Nguyen, Trung Thien Hoang, Thanh Nho Do, Hoang-Phuong Phan

Subject: Engineering, Mechanical Engineering Keywords: Transparent pressure sensors; Robotic palpation; Surgical soft robotics; Flexible sensors.

Online: 5 May 2023 (04:31:51 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0280.v1

Failure of Perforated Polymethyl Methacrylate Specimens Loaded by Inserted Pins

Adrian Gonzalez, Young W. Kwon

Subject: Engineering, Mechanical Engineering Keywords: pin loading; failure criteria; notch

Online: 5 May 2023 (03:05:46 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0234.v1

Damage Cascade Simulation in Zirconium Nitride: A Molecular Dynamics Study

M. Mustafa Azeem

Subject: Engineering, Mechanical Engineering Keywords: Molecular dynamics; LAMMPS; displacement cascade; defects

Online: 4 May 2023 (08:27:04 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0194.v1

Gearbox Fault Diagnosis Based on Optimized Stacked Denoising Auto Encoder and Kernel Extreme Learning Machine

Zhenghao Wu, Hao Yan, Xianbiao Zhan, Liang Wen, Xisheng Jia

Subject: Engineering, Mechanical Engineering Keywords: self-adaptive weighted particle swarm optimization algorithm; stacked denoising automatic encoder; kernel extreme learning machine; gearbox; fault diagnosis

Online: 4 May 2023 (05:16:18 CEST)

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Preprint REVIEW | doi:10.20944/preprints202305.0169.v1

Assessment of the Smart Mechatronics Application in Agricultural: A Review

Girma Gebresenbet, Sairoel Amertet Finecomess

Subject: Engineering, Mechanical Engineering Keywords: mechatronics; robotics system; automation; robotics; agriculture mechanism

Online: 4 May 2023 (03:18:40 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0162.v1

Optimization of Drag Using Computational Fluid Dynamics for Hydrofoil Sailing Catamaran Hulls

Richard Luco, José M. Ahumada, Aitor C. Raposeiras, D. Movilla-Quesada, B. Castro

Subject: Engineering, Mechanical Engineering Keywords: Catamaran sailing; drag; hydrofoils; fluid dynamics; optimizaton

Online: 4 May 2023 (02:38:48 CEST)

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Preprint REVIEW | doi:10.20944/preprints202305.0146.v1

Revolutionizing Prosthetic Design with Auxetic Metamaterials: A Review of Mechanical Properties and Limitations

Muhammad Faris Fardan, Bhre Wangsa Lenggana, U Ubaidillah, Seung-Bok Choi, Didik Djoko Susilo, Sohaib Z. Khan

Subject: Engineering, Mechanical Engineering Keywords: prosthetic devices; metamaterials; auxetic structure; negative Poisson’s ratio; metastructure

Online: 3 May 2023 (12:31:06 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0076.v1

Piezoresistive Behavior of a Conductive Polyurethane Based Foam for Real Time Structural Monitoring

Antoine Poirot, Nacera Bedrici, Jean-Christophe Walrick, Michel Arrigoni

Subject: Engineering, Mechanical Engineering Keywords: Piezoresistivity; impact sensing; polyurethane foam; structural health monitoring (SHM); smart materials

Online: 2 May 2023 (09:48:25 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.1271.v1

Nondestructive Internal Defect Detection of In-Shell Walnuts by X-ray Technology Based on Improved Faster R-CNN

Hui Zhang, Shuai Ji, Mingming Shao, Houxu Pu, Liping Zhang

Subject: Engineering, Mechanical Engineering Keywords: Walnuts; X-ray images; Non-destructive detection; Food quality inspection; Improved Faster R-CNN

Online: 30 April 2023 (09:30:42 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.1226.v1

Mesoscale Static and Fatigue Analysis of 2D Woven Roving Plates with Convex Holes and Subjected to Axial Tension

Aleksander Muc

Subject: Engineering, Mechanical Engineering Keywords: 2D woven roving composites; Notch; Stress concentrations; Low Fatigue Cycles; Nonlinear behaviour; Crack initiation; Fuzzy degradation of properties; Experimental results; Numerical modeling

Online: 29 April 2023 (07:50:49 CEST)

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Abstract—In the present paper the static and fatigue analysis of plates with holes is conducted. Structures are made of 2D woven roving composites. The parametrization of convex holes is proposed. Experimental results of specimens without holes and with different shapes of notches under static and fatigue tensile loads are presented. The fatigue behaviour of structures is analysed with the use of the low cycle fatigue method. The attention is focused on the nonlinear deformations of 2D woven roving structures leading to the scatter of results. The analysis is supplemented by the numerical finite element modeling. The agreement between experimental and finite element modeling is very good. Since we do not intend to repeat in the abstract the review of the existing literature I would like to emphasize only that the present work is a continuation and extension of the results discussed in the literature – see the next sections of the paper. The finite element modeling of plates with holes is presented in details by Muc [1], Muc, Ulatowska [2] and Muc, Romanowicz [3] including also the problems of the accuracy. The mesh correctness and accuracy is discussed in Ref [2] where the results are compared to the analytical results illustrated in the Soviet Union literature. The experimental results and the form of specimens are shown by Pandita et al. [4] and they are fundaments for our present experimental investigations. Two parametrical description of static and fatigue behaviour of plates with holes characterizes the goal and the novelty of the paper. The analysis demonstrates how those parameters affect on the variations of static and fatigue failure loads. In addition, it should be emphasized that the fuzzy approach is employed herein to reduce the number of experimental data and to avoid statistical analysis of experimental results – see e.g. Muc [5]. In the mesoscale modeling and using the fuzzy approach it is possible to achieve a very good description of static and fatigue behavior of plates with convex holes subjected to tension.

Preprint ARTICLE | doi:10.20944/preprints202304.0289.v2

Numerical Analysis of SO₂ Absorption inside a Wet Scrubber

Amedeo Amoresano, Giuseppe Langella, Paolo Iodice, Silvia Roscioli

Subject: Engineering, Mechanical Engineering Keywords: Seawater scrubber; SOX; Absorption

Online: 29 April 2023 (02:47:05 CEST)

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Preprint BRIEF REPORT | doi:10.20944/preprints202304.1175.v1

Effects of Mean Stress and Multiaxial Loading on Fatigue Life of Springs

Vladimir Kobelev

Subject: Engineering, Mechanical Engineering Keywords: fatigue life of springs; SMITH-WATSON-TOPPER approach; WALKER approach; BERGMANN approach; Accumulation of damage; sequence effects in fatigue

Online: 28 April 2023 (11:11:04 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.1169.v1

Dry Adhesive Microstructures for Material Handling of Additively Manufactured and Deep Rolled Metal Surfaces with Reference to Mars

Nicole Mensching, Mirja Louisa Krüger, Askar Kvaratskheliya, Daniel Meyer, Kirsten Tracht, Ilya V. Okulov, Lutz Mädler

Subject: Engineering, Mechanical Engineering Keywords: surface properties; dry-adhesive microstructures; deep rolling; additive manufacturing

Online: 28 April 2023 (10:55:57 CEST)

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Preprint REVIEW | doi:10.20944/preprints202304.1142.v1

Review of Research Progress in the Case of Non-conventionally Treated Steel with Plasma Nitriding Applied after Thermomagnetic Treatment

Carmen-Penelopi Papadatu

Subject: Engineering, Mechanical Engineering Keywords: Plasma nitriding; thermo-magnetic treatment; steel; surface layer; wear tests

Online: 28 April 2023 (08:09:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.1138.v1

Application of the DMD Approach to High Reynolds Number Flow Over an Idealized Ground Vehicle

Adit S Misar, Nathan A Tison, Vamshi M Korivi, Mesbah Uddin

Subject: Engineering, Mechanical Engineering Keywords: Dynamic Mode Decomposition (DMD); Computational Fluid Dynamics (CFD); Reduced Order Method (ROM); Ahmed Body; Turbulent Flows; High Reynolds Number Flows; Improved Delayed Detached Eddy Simulations (IDDES); Road Vehicle Aerodynamics

Online: 28 April 2023 (07:57:31 CEST)

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Preprint REVIEW | doi:10.20944/preprints202304.1006.v1

Laser Cavitation Peening: A Review

Hitoshi Soyama, Yuka Iga

Subject: Engineering, Mechanical Engineering Keywords: pulsed laser; cavitation; mechanical surface treatment; cavitation peening; additive manufactured metal; fatigue strength; titanium alloy

Online: 27 April 2023 (02:41:00 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0994.v1

Open-Source Designs for Distributed Manufacturing of Low-Cost Customized Walkers

Anita So, Jacob M. Reeves, Joshua M. Pearce

Subject: Engineering, Mechanical Engineering Keywords: mobility; mobility aid; adaptive aid; walker; 3-D printing; additive manufacturing; mechanical testing; open hardware; open source hardware; frugal innovation

Online: 26 April 2023 (13:06:50 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0976.v1

Application of Functionally Graded Shell Lattice as Infill in Additive Manufacturing

Slawomir KEDZIORA, Thierry DECKER, Elvin MUSEYIBOV

Subject: Engineering, Mechanical Engineering Keywords: Functionally graded lattice structure; infill; design exploration; finite element method; bicycle crank arm; additive manufacturing

Online: 26 April 2023 (10:24:45 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0959.v1

Real-Time Pipe Structure Change Detection and Classification using Distributed Acoustic Fiber Sensors Based on Convolutional Neural Network (CNN) Models

Pengdi Zhang, Abhishek Venketeswaran, Ruishu F. Wright, Nageswara Lalam, Enrico Sarcinelli, Paul R. Ohodnicki

Subject: Engineering, Mechanical Engineering Keywords: machine learning; mechanical damage detection; pipelines; physics-informed datasets; simulations; welding detection; CNN structure optimization; sensing system; data classification performance and noise robustness

Online: 26 April 2023 (04:59:54 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0921.v1

Improved Algorithms of Data Processing for Dispersive Interferometry using Optical Frequency Comb

Tao Liu, Jiucheng Wu, Amane Suzuki, Ryo Sato, Hiraku Matsukuma, Wei Gao

Subject: Engineering, Mechanical Engineering Keywords: absolute distance measurement; dispersive interferometry; Fourier transform; optical frequency comb; excess fraction method

Online: 25 April 2023 (10:24:28 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0877.v1

Laboratory Machine Verification of Force Transmission Provided by Friction Acting on the Drive Drum of a Conveyor Belt

Leopold Hrabovský, Petr Nenička, Jiří Fries

Subject: Engineering, Mechanical Engineering Keywords: laboratory machine; conveyor belt; coefficient of friction; drive drum; rum coating; tensile forces exerted on the belt

Online: 25 April 2023 (03:52:21 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0846.v1

Effect of Flexible Operation on Residual Life of High-Temperature Components of Power Plants

Jun Heo, Mingyu Park, Jeong-myun Kim, Dong-Won Jang, Ji-Hoon Han

Subject: Engineering, Mechanical Engineering Keywords: Flexible operation; Creep-fatigue behavior; Response surface model

Online: 24 April 2023 (10:10:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0840.v1

A Low-Cost Nanostructured Multilayer Piezoelectric Energy Harvester for IoT Devices Using Three-Beam Lead-Free Architecture: A Complete Characterization

Luis A. Uscanga-González, Ernesto A. Elvira-Hernández, Ervin Jesús Alvarez-Sánchez, Francisco López-Huerta, Agustin L. Herrera-May, Rodrigo Fernández-Loyola

Subject: Engineering, Mechanical Engineering Keywords: ZnO; multilayer film; vibration energy harvester; spray deposition; piezoelectric generator; nanostructured material

Online: 24 April 2023 (09:34:09 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0839.v1

Phase Field Modeling of Crack Growth with Viscoplasticity

Qianyu Shi, Hongjun Yu, Xiangyuhan Wang, Licheng Guo, Kai Huang, Jian Han

Subject: Engineering, Mechanical Engineering Keywords: Viscoplastic constitutive; Phase field model; Crack growth; Fracture simulation

Online: 24 April 2023 (09:28:08 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0835.v1

Determination Method of Kinetic Parameters of Strength Recovery in Self-Healing Ceramic Composites

Mostafizur Rahman, Maeda Taiyo, Toshio Osada, Shingo Ozaki

Subject: Engineering, Mechanical Engineering Keywords: self-healing ceramics; oxidation kinetics; activation energy; frequency factor; strength recovery

Online: 24 April 2023 (08:54:26 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0833.v1

Pattern Recognition In Hybrid Dynamical Systems Using Fibonacci Theorem: Jeffcott Rotors

Roberto Outa, Fábio Roberto Chavarette, Aparecido Carlos Gonçalves³, Sandro da Silva Pinto, Fernando Augusto Garcia Muzzi

Subject: Engineering, Mechanical Engineering Keywords: Jeffcott Rotors; Fibonacci; Vibration; Pattern Recognition; Digital Signal Processing.

Online: 24 April 2023 (07:47:25 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0757.v1

Explainable Artificial Intelligence (XAI) and Supervised Ma-Chine Learning Based Algorithms for Prediction of Surface Roughness of Additive Manufactured Polyactic Acid (PLA) Specimens

Akshansh Mishra, Vijaykumar S. Jatti, Eyob Messele Sefene, Shivangi Paliwal

Subject: Engineering, Mechanical Engineering Keywords: Additive Manufacturing; Explainable Artificial Intelligence; Machine Learning; Supervised Learning; Surface Roughness; Structural Integrity

Online: 23 April 2023 (04:04:49 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0721.v1

Evaluation of Spiral Pneumatic Rubber Actuator using Finite Element Analysis for Radial Transportation

Yujin Jang, Hiroyuki Nabae, Koichi Suzumori

Subject: Engineering, Mechanical Engineering Keywords: Soft Robotics; Soft Pneumatic Actuators; Spiral Structural; Finite Element Analysis

Online: 21 April 2023 (10:43:13 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0720.v1

Tilting-Pad Bearings -- Contact Flexibility of the Pivot

Laurence F Wagner

Subject: Engineering, Mechanical Engineering Keywords: bearings; tilting-pad; dynamic; coefficients; stiffness; damping; pivot; contact; flexibility

Online: 21 April 2023 (10:42:07 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0693.v1

Mechanical Behavior of Crimping Composite Post Insulator : Experimental and Simulation Study

Jin Xiao, Yanhong Zhang, Yichuan Xing, Yangyang Jiao, Lihong Zhang

Subject: Engineering, Mechanical Engineering Keywords: composite post insulator; dynamic performance test; flexible high voltage direct current (HVDC) converter valve; finite element analysis, mechanical property

Online: 21 April 2023 (08:40:33 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0682.v1

Thermomechanical Peridynamic Modeling for Ductile Fracture

Shankun Liu, Fei Han, Xiaoliang Deng, Ye Lin

Subject: Engineering, Mechanical Engineering Keywords: Peridynamics; Thermoelastic Coupling; Plastic Deformation; Fracture Simulation.

Online: 21 April 2023 (08:09:17 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0624.v1

Comparison of Anodic and Au-Au Thermocompression Si-Wafer Bonding Methods for High-pressure Microcooling Devices

Sylwester Bargiel, Julien Cogan, Samuel Queste, Stefania Oliveri, Ludovic Gauthier-Manuel, Marina Raschetti, Olivier Leroy, Stéphan Beurthey, Mathieu Perrin-Terrin

Subject: Engineering, Mechanical Engineering Keywords: bonding technology; anodic bonding; thermo-compression bonding; microcooling; microfluidic device; burst pressure test

Online: 20 April 2023 (07:53:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0623.v1

Effects of Flowrate of Additional Shielding Gas on the Properties of Welded Seam by Twin-wire GMAW Welding for Duplex Stainless Steel

Yu Hu, Jiaxiang Xue

Subject: Engineering, Mechanical Engineering Keywords: Flowrate of additional shielding gas; Butt weld; MIG; high-speed welding; duplex stainless steel

Online: 20 April 2023 (07:48:20 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0621.v1

The Impact of a Change in Maintenance Strategy on the Effi-Ciency and Quality of the Production System

Miroslav Rakyta, Peter Bubenik, Vladimira Binasova, Gabriela Gabajova, Katarina Staffenova

Subject: Engineering, Mechanical Engineering Keywords: quality; manufacturing system; maintenance strategy; maintenance processes; maintenance system; Industry 4.0; corrective maintenance, maintenance optimization.

Online: 20 April 2023 (07:44:36 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0556.v1

Effect of Premixed Ethanol Ratio Based on the Same Heating Value on the Atomization of Diesel Fuel Injected in the Cylinder

Se Hun Min, And Hyun Kyu Suh

Subject: Engineering, Mechanical Engineering Keywords: Keywords Air Emissions from Fossil Fuel Combustion; Fuel Combustion; Energy Conversion/system; Energy Systems Analysis

Online: 19 April 2023 (07:18:20 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0529.v1

Dynamic Modeling and Analysis of a Driving Passenger Vehicle

Seen Yun, Jeonga Lee, Woojae Jang, Daeji Kim, Minseok Choi, Jintai Chung

Subject: Engineering, Mechanical Engineering Keywords: dynamic analysis; dynamic model; dynamic responses; mode shapes; natural frequencies; suspension deformations; vehicle driving test; steering conditions

Online: 19 April 2023 (03:29:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202211.0500.v2

A Combined Machine Learning (ML) and Discrete Element Model (DEM) for Pharmaceutical Aerosol Transport in Airways

Mohammad S. Islam, Puchanee Larpruenrudee, Md. Mizanur Rahman, Emilie Sauret, Yuantong Gu, Shahid Husain

Subject: Engineering, Mechanical Engineering Keywords: CFD-DEM; Particle-particle interaction; Upper airway; DE; Spring constant

Online: 18 April 2023 (10:25:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0469.v1

Thermo-Mechanical Coupling Numerical Simulation for Extreme High-Speed Laser Cladding of Chrome-iron alloy

Liangxiao Nian, Miaohui Wang, Xueyuan Ge, Xin Wang, Yifei Xu

Subject: Engineering, Mechanical Engineering Keywords: extreme high-speed laser cladding; numerical simulation; temperature field; stress field; residual stress

Online: 18 April 2023 (03:33:55 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0458.v1

Investigation of Effects of Slider Structure on the Reversing Performance of Four-way Reversing Valve

Kepeng Zhang, Dazhuan Wu, Huan Wang

Subject: Engineering, Mechanical Engineering Keywords: Four-way reversing valve; Computational fluid dynamics (CFD); Slider; Reversing performance

Online: 18 April 2023 (02:54:55 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0416.v1

Reconfiguration Analysis and Characteristics of a Novel 8-link Variable-DOF Planar Mechanism with Five Motion Modes

Xianwen Kong, Jieyu Wang

Subject: Engineering, Mechanical Engineering Keywords: Variable-DOF mechanism; reconfigurable mechanism; reconfiguration analysis; motion mode; factorization of two-angle trigonometric function

Online: 17 April 2023 (07:06:59 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0412.v1

Analysis of Flow Characteristics of a Debris Filter in a Condenser Tube Cleaning System

Da Woon Jung, Young-Chan Lim, Chung-Won Seo, Dong Sun Kim, Seung Yul Lee, Hyun Kyu Suh

Subject: Engineering, Mechanical Engineering Keywords: CTCS; Debris filter; Differential pressure; Fluid resistance; Pressure drop; Turbulence kinetic energy; Flow vortex

Online: 17 April 2023 (06:16:34 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0391.v1

Numerical Simulation of the Lubricant-Solid Interface Using the Multigrid Method

Ruchita Patel, Zulfiqar Ahmad Khan, Vasilios Bakolas, Adil Saeed

Subject: Engineering, Mechanical Engineering Keywords: Mixed Lubrication (ML); Numerical Simulation; Computational Fluid Dynamics (CFD); Full Multigrid method; fluid-solid interactions

Online: 17 April 2023 (03:57:56 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0304.v1

Hysteresis Behavior Modeling of Magnetorheological Elastomers Under Impact Loadings Using MultiLayers Exponential Based Preisach Model Enhanced With Particle Swarm Optimization

Alawiyah Hasanah Mohd Alawi, Khisbullah Hudha, Zulkiffli Bin Abd Kadir, Noor Hafizah Amer

Subject: Engineering, Mechanical Engineering Keywords: magnetorheological; elastomers; hysteresis behavior; impact loading; preisach model; particle swarm optimization; exponential function.

Online: 13 April 2023 (07:36:55 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0301.v1

Dynamic of a Flexible Rotor-Bearing System Supported by Worn Tilting Journal Bearings Experiencing Rub-Impact

Ebrahim Tofighi-Niaki, Mir Saeed Safizadeh

Subject: Engineering, Mechanical Engineering Keywords: Rotor dynamics; Bearing wear; Mixed lubrication; Tilting pad journal bearings

Online: 13 April 2023 (07:21:01 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0294.v1

Numerical Study of Velocity and Mixture Fraction Fields in a Turbulent Non-reacting Propane Jet Flow Issuing into Parallel Co-Flowing Air in Isothermal Condition through OpenFOAM

Abdolreza Aghajanpour, Seyedalireza Khatibi

Subject: Engineering, Mechanical Engineering Keywords: turbulence modeling; non-reaction Propane jet; Realizable k-ε eddy viscosity turbulence model; OpenFOAM.

Online: 13 April 2023 (03:46:00 CEST)

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The present work is a numerical simulation of velocity and mixture fraction fields in a turbulent non-reaction Propane jet flow issuing into parallel co-flowing air, in isothermal condition which has been experimentally described here: http://www.sandia.gov/TNF/DataArch/ProJet.html. The objective is a better understanding of the flow structure and mixing process, a situation in which there is no chemical interaction and heat-transfer. The two-equation Realizable k-ε eddy viscosity turbulence model has been used to simulate the turbulent flow field on a 2D plane (i.e., on a 5-degree sector of the experimental domain), because Realizable k-ε more accurately predicts the spreading rate of both planar and round jets and presents the best proficiency in comparison with all versions of the k-ε models. Afterward, axial and radial profiles of mean velocities, turbulence energy, mean mixture fraction, the mixture fraction half radius (Lf), and the mass flux diagram have been numerically elicited for grid independent mesh (mesh B) and compared with corresponding experimental data to assess the numerical model. To obtain turbulence kinetic energy, k, due to lack of w' in the experimental data, the assumption of w'=v' seems to be valid. Simulations have demonstrated that mean mixture fraction (at radial proﬁles at locations x/D=0, 4, 15, 30 and 50) and its half radius, Lf, which characterizes jet width expanse, are prominently well-captured; Moreover, mean vertical velocity fields (in X-direction: Umean) have revealed less accuracy but still conspicuously well-captured. However, mean vertical velocity fields (in Y-direction: Vmean) have disclosed less resolution; Likewise, turbulence kinetic energy, k, have manifested moderate accuracy (between Umean and Vmean). It should be noticed that although numerical results for absolute pressure, p, have been obtained on aforementioned sections, there were no experimental data to compare with them. Thus, the corresponding numerical data has not been demonstrated in this study.

Preprint ARTICLE | doi:10.20944/preprints202304.0184.v1

Dynamic Model of a Novel Planar Cable Driven Parallel Robot with a Single Cable Loop

Antonio Gonzalez-Rodríguez, Andrea Martín-Parra, Sergio Juárez-Pérez, David Rodríguez-Rosa, Francisco Moya-Fernández, Fernando J. Castillo-García, Jesús Rosado

Subject: Engineering, Mechanical Engineering Keywords: Cable-Driven Parallel Manipulator; Dynamic model; Workspace

Online: 11 April 2023 (03:44:37 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0136.v1

Numerical Modelling and Simulation of the Solid Oxide Cell Stacks and Metal Interconnect Oxidation With OpenFOAM

Shangzhe Yu, Shidong Zhang, Dominik Schäfer, Roland Peters, Felix Kunz, Rüdiger-A. Eichel

Subject: Engineering, Mechanical Engineering Keywords: solid oxide cell; multiphysics modelling; OpenFOAM; openFuelCell2; metal interconnect oxidation

Online: 10 April 2023 (03:41:58 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0128.v1

A Comparison of Signal Analysis Techniques for the Diagnostics of IMS Rolling Element Bearing Dataset

Diletta Sacerdoti, Matteo Strozzi, Cristian Secchi

Subject: Engineering, Mechanical Engineering Keywords: vibrations; condition monitoring; rolling element bearings; signals; fault diagnosis

Online: 7 April 2023 (13:13:47 CEST)

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Preprint REVIEW | doi:10.20944/preprints202304.0104.v1

Tesla Valve Microfluidics: The Rise of Forgotten Technology

Agnes Purwidyantri, Briliant Adhi Prabowo

Subject: Engineering, Mechanical Engineering Keywords: Tesla; valve; microfluidics; valvular conduit; rectifier fluid

Online: 7 April 2023 (03:18:45 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0091.v1

Characterisation of the Contact between Cross-Country Skis and Snow: A Micro-Scale Study Considering the Ski-Base Texture

Kalle Kalliorinne, Bo N. J. Persson, Joakim Sandberg, Gustav Hindér, Roland Larsson, Hans-Christer Holmberg, Andreas Almqvist

Subject: Engineering, Mechanical Engineering Keywords: Winter sports; Sports equipment; Snow; Cross-country skiing; Ski friction; Ski-base texture

Online: 6 April 2023 (10:57:19 CEST)

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In winter sports, the equipment often comes into contact with snow or ice, and this contact generates a force that resists motion. In some sports, such as cross-country skiing, this resistive force can significantly affect the outcome of a race, as a small reduction in this force can give an athlete an advantage. Researchers have examined the contact between skis and snow in detail, and to fully understand this friction, the entire ski must be studied at various scales. At the macro scale, the entire geometry of the ski is considered and the apparent contact between the ski and the snow is considered and at the micro scale the contact between the snow and the ski base ski-base textures. In the present work, a method for characterising contact between the ski-base texture and virtual snow will be presented. Six different ski-base textures will be considered. Five of them are stone-ground ski bases, and three of them have linear longitudinal textures with a varying number of lines and peak-to-valley height, and the other two are factory-ground “universal” ski bases. The sixth ski base has been fabricated by a steel-scraping procedure. In general, the results show that a ski base texture with a higher Spk-value has less real contact area, and that the mutual differences can be large for surfaces with similar Sa-values. The average interfacial separation is, in general, correlated with the Sa-value, where a “rougher” surface exhibits a larger average interfacial separation. The results for the reciprocal average interfacial separation, which is related to the Couette type of viscous friction, were in line with the general consensus that a “rougher” texture performs better at high speed than a “smoother” one, and it was found that a texture with high Sa and Spk values resulted in a low reciprocal average interfacial separation and consequently low viscous friction. The reciprocal average interfacial separation was found to increase with increasing real contact area, indicating a correlation between the real area of contact and the Couette part of viscous friction.

Preprint ARTICLE | doi:10.20944/preprints202108.0087.v8

Fabrication Methods of the Polygonal Masonry of Large Tightly-fitted Stone Blocks with Curved Surface Interfaces in Megalithic Structures of Peru

Rostislav Lapshin

Subject: Engineering, Mechanical Engineering Keywords: stone block; polygonal masonry; clay model; pantograph; translator; parallelogram mechanism; replica; chisel; hammer; megalith; star fortress; Inca; Cusco; Ollantaytambo; Machu Picchu; Sacsayhuaman; Peru; polygonal bas-relief; polygonal Face Towers; Angkor; Cambodia; symmetrical statue; pharaoh statue; Ramses; Egypt

Online: 14 March 2023 (14:19:00 CET)

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Preprint ARTICLE | doi:10.20944/preprints202303.0186.v1

Experimental Evaluation on Fatigue Strength of Lattice Structures of AlSi10Mg Fabricated by AM for an Innovative Aerospace Anti-Ice System

Carlo Giovanni Ferro, Sara Varetti, Paolo Maggiore

Subject: Engineering, Mechanical Engineering Keywords: Additive Manufacturing; Lattice Structures; Fatigue Strength; Aerospace System Design

Online: 10 March 2023 (08:02:59 CET)

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Preprint ARTICLE | doi:10.20944/preprints202303.0142.v1

An Affordable Acoustic Measurement Campaign for Early Prototyping Applied to Electric Ducted Fan Units

Stefan Schoder, Jakob Schmidt, Andreas Fürlinger, Klaus Roppert, Paul Maurerlehner

Subject: Engineering, Mechanical Engineering Keywords: Aeroacoustics; Electric ducted fan; Microperforated plate absorbers; eVTOL

Online: 8 March 2023 (02:58:56 CET)

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New innovative green concepts in electrified vertical take-off and landing vehicles currently emerge as a revolution to urban mobility going into the third dimension (vertically). The high population density of cities makes the market share highly attractive while posing an extraordinary challenge for community acceptance due to the increasing and possibly noisier commuter traffic. In addition to passenger transport, package deliveries to customers by drones may enter the market. The new challenges associated with this increasing transportation need in urban, rural and populated areas pose challenges for established companies and startups to deliver low-noise emission products. The article's objective is to revisit the benefits and drawbacks of an affordable acoustic measurement campaign focused on early prototyping. In the very early phase of product development, often considerably limited resources are available. With this in mind, the article discusses the sound power results using the enveloping surface method in a typically available low-reflection room with a reflecting floor according to DIN EN ISO 3744:2011-02. The method is applied to a subsonic electric ducted fan (EDF) unit of a 1:2 scaled electrified vertical take-off and landing vehicle. The results show that considerable information at low costs can be gained for the early prototyping stage, despite this easy-to-use, easy-to-realize, and not fine-tuned measurement setup. Furthermore, the limitations and improvements to a possible experimental setup are presented to discuss a potentially more ideal measurement environment. Measurements at discrete operating points and transient measurements across the total operating range were conducted to provide complete information on the EDF's acoustic behavior. The rotor-self noise and the rotor-stator interaction were identified as primary tonal sound sources, along with the highest broadband noise sources located on the rotor. Based on engineering experience, a first acoustic improvement treatment is also quantified with a sound power level reduction of 4dB(A). In conclusion, the presented method is a beneficial first measurement campaign to quantify the acoustic properties of an electric ducted fan unit at minimal resources in a reasonable time of several weeks when starting from scratch.

Preprint ARTICLE | doi:10.20944/preprints202303.0055.v1

A Feasibility Analysis of a Solar Power Plant with Direct Steam Generation System in Sonora, Mexico

Ernesto Enciso Contreras, Juan Gabriel Barbosa-Saldaña, Jesus de la Cruz Alejo, Claudia Del C. Gutiérrez-Torres, Jose Alfredo Jimenez Bernal, Maria Belem Arce Vazquez

Subject: Engineering, Mechanical Engineering Keywords: PTC; DSG; solar energy; power plant

Online: 3 March 2023 (03:44:17 CET)

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Preprint ARTICLE | doi:10.20944/preprints202302.0517.v1

Improving the Fatigue Design of Mechanical Products Such as Bearings Based on a (Generalized) Life-Stress Prototype and Sample Size

Seongwoo Woo, Dennis L. O’Neal, Yimer Mohammed Hassen, Gezae Mebrahtu

Subject: Engineering, Mechanical Engineering Keywords: mechanical system; fatigue design; parametric ALT; ice-maker; bearing; design defects

Online: 28 February 2023 (09:54:15 CET)

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Preprint ARTICLE | doi:10.20944/preprints202302.0502.v1

Comparative Study on Hot Metal Flow Behaviour of Virgin and Rejuvenated Heat Treatment Creep Exhausted P91 Steel

Shem Maube, Japheth Obiko, Josias Van der Merwe, Desmond Klenam, Fredrick M Mwema, Michael Bodunrin

Subject: Engineering, Mechanical Engineering Keywords: P91 steel; Rejuvenation Heat treatment; Creep Exhausted; Constitutive equation; hot deformation

Online: 28 February 2023 (04:14:02 CET)

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Preprint ARTICLE | doi:10.20944/preprints202302.0439.v1

Optimization of Pile Driver Frame Based on Sensitivity Analysis

JinMei Wu, Yanqing Yang

Subject: Engineering, Mechanical Engineering Keywords: sensitivity; pile driver; frame; Ansys; optimization design

Online: 27 February 2023 (04:28:30 CET)

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Preprint ARTICLE | doi:10.20944/preprints202302.0377.v1

Employment of Fracture Mechanics Criteria for Accurate Assessment of the Full Set of Elastic Constants of Orthorhombic/Tetragonal Mono-Crystalline YBCO

Reaz A. Chaudhuri

Subject: Engineering, Mechanical Engineering Keywords: Three-dimensional Stress Singularity; Fracture Mechanics Criterion; Sufficient Condition for Fracture; Easy Cleavage System; Orthorhombic Single Crystal; Elastic Constants of Mono-crystalline YBCO

Online: 22 February 2023 (07:00:10 CET)

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