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Preprint ARTICLE | doi:10.20944/preprints202410.1770.v1

Design and Analysis of a Proportional Electromagnet with Experimental Validation for Static and Dynamic Behavior

Ercan Düzgün, Gürsel Şefkat

Subject: Engineering, Mechanical Engineering Keywords: electromagnetic; actuator; FEM; proportional solenoid actuator; constant force characteristics; proportional solenoid valve; solenoid; dynamic model; look-up table; optimization

Online: 23 October 2024 (11:36:38 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.1751.v1

Point Cloud as Imaging Effect in Coordinate Optical Measurement—A New Method for Evaluating Measurement Accuracy (OPTI‐U)

Danuta Owczarek, Ksenia Ostrowska, Adam Gąska, Jerzy Sładek, Krzysztof Tomczyk

Subject: Engineering, Mechanical Engineering Keywords: point cloud; filtration; noise reduction; operator; accuracy; optical coordinate measurement

Online: 22 October 2024 (16:35:55 CEST)

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The article presents extremely current issues concerning imaging and measurements carried out using coordinate optical systems in which the result of scanning spatial objects is a point cloud. What is important, the entire accuracy assessment of the conducted fast, effective coordinate measurement nowadays takes place in the computational area, beyond direct sensory percep-tion, and depends increasingly on its power and the computational algorithms used. Further-more, we are getting closer and closer to recognising virtual standards in coordinate metrology as a direction that allows for an increase in measurement accuracy. Especially in recent years, the importance of the problem has been confirmed by the activities of the most significant scientific and research centres. They focus on improving the accuracy of the data obtained in the form of point clouds, using more precise scanning methods for this purpose, and developing filtering algorithms to remove noise, including methods using artificial intelligence. Based on many years of research, the authors identified a problem regarding the difficulty in developing data obtained from optical systems, such as laser triangulation head systems, systems operating on the principle of structural light, photogrammetric systems, as well as computer tomographs, and the impact of these systems on the assessment of measurement accuracy. Therefore, the optical measurement process was analysed in terms of the quality of the acquired point clouds. The authors presented the division of factors, which, in coordinate optical meas-urements, generate errors in data acquisition and development. The authors also indicated which of these factors generate the most significant errors and, above all, emphasised the impact of the software used, the measurement operator, and the methods of cloud filtration applied by the operator. Therefore, the accuracy assessment of the optical measurement has been noted as a critical problem, and so far, it has not been solved effectively. In the article, as a solution to this problem, the authors proposed the OPTI-U method of estimating uncertainty for optical meas-urements. The method, what is very important, was developed and verified under the conditions of an accredited calibration laboratory. The summary also gives directions for further work on developing and disseminating the developed method, particularly introducing virtual standards.

Preprint ARTICLE | doi:10.20944/preprints202410.1617.v1

Topology Optimization of the Bracket Structure in the Acquisition, Pointing, and Tracking System Considering Displacement and Key Point Stress Constraints

Bo Gao, Hongtao Yang, Weining Chen, Hao Wang

Subject: Engineering, Mechanical Engineering Keywords: structural topology optimization; acquisition; pointing; and tracking system; displacement and stress constraints; minimization of structural compliance; solid isotropic material with penalization

Online: 22 October 2024 (09:50:26 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.1586.v1

Effects of the Position and Size of the Air Injection Holes in the Flow Structure of a Trapped Vortex Combustor

Luis Alfonso Moreno Pacheco, Juan Gabriel Barbosa Saldaña, Edgar Geovany López Jarquín, José Martínez-Trinidad, Ricardo Andrés García León, Miguel Toledo-Velázquez

Subject: Engineering, Mechanical Engineering Keywords: Trapped-vortex combustors; Flow structure; Non-Reactive Flow; Combustors; Numerical Simulation.

Online: 21 October 2024 (14:39:57 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.1424.v1

Depth of Defect Detection in Immersive Environments through Ultrasonic Sensor Data Analysis and Recommender System

Vahid Hassani, Zunaidi Ibrahim

Subject: Engineering, Mechanical Engineering Keywords: ultrasonic sensor; depth of defect (DoD); data cleaning process; recommender system

Online: 18 October 2024 (16:36:58 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.1461.v1

Experimental Investigation of Steel-Borne Acoustic Pulses for Fault Pinpointing in Pipe-Type Cable Systems: A Scaled-Down Model Approach

Zaki Moutassem, Gang Li, Weidong Zhu

Subject: Engineering, Mechanical Engineering Keywords: Acoustic Pinpointing; Fault Pinpointing; Fault Location; HPFF; Underground Power Transmission

Online: 18 October 2024 (14:20:52 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.1487.v1

Resistance Spot Welding Defect Detection Based on Visual Inspection: Improved Faster R-CNN Model

Weijie Liu, Jie Hu, Jin Qi

Subject: Engineering, Mechanical Engineering Keywords: resistance spot welding; surface defect detection; deep learning model; Faster R-CNN; small object detection

Online: 18 October 2024 (14:06:38 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.1418.v1

Mechanical Properties of Spunlace Non-Wovens with a Porous Structure

Michał Sąsiadek, Anna D. Dobrzańska-Danikiewicz, Maciej Niedziela, Waldemar Woźniak, Michał Szota

Subject: Engineering, Mechanical Engineering Keywords: non-woven; porous structure; carding process; tensile strength; SEM

Online: 18 October 2024 (10:56:29 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.1302.v1

Impact of Processing Methods on Mechanical Properties of Neat PLA and PLA Blends with PCL and PEO: Electrospinning vs Solvent Casting

Qi-Hong Weng, Ming-Hsien Hu, Jin-Jia Hu

Subject: Engineering, Mechanical Engineering Keywords: electrospinning; solvent casting; solvent blending; blend electrospinning; polylactic acid; thin films; mechanical properties; crystallinity

Online: 16 October 2024 (16:12:35 CEST)

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The increasing environmental concerns related to no-biodegradable plastics have driven the development of biodegradable alternatives derived from renewable resources. Polylactic acid (PLA), a biodegradable polymer known for its favorable mechanical strength and biocompatibility, suffers from brittleness and poor ductility. This study aims to improve the flexibility of PLA by blending it with polycaprolactone (PCL) and polyethylene oxide (PEO). Specifically, thin films were fabricated from neat PLA, PCL, PLA/PCL, and PLA/PEO blends using both electrospinning and solvent casting to investigate the effects of processing methods on their mechanical behavior. The films were characterized using SEM, FTIR, XRD, DSC, uniaxial tensile testing, and water contact angle measurements. The surface morphology of single electrospun fibers was further examined using AFM. We found that electrospun PLA films exhibited higher elongation at break and ultimate strength with a slightly lower Young’s modulus in comparison to its solvent-cast films. FTIR, XRD, and DSC analyses consistently showed that the electrospun PLA films had significantly lower crystallinity compared to their solvent-cast counterparts. Notably, AFM phase imaging revealed that the electrospun PLA fibers exhibited an aligned crystalline structure. Blending PLA with PCL significantly improved elongation at break in electrospun films, which, unlike solvent-cast blends, retained a Young's modulus comparable to electrospun PLA. This improvement is likely due to reduced phase separation and enhanced crystalline alignment. Furthermore, electrospun films of neat PLA, PCL and PLA/PCL blends were more hydrophobic than their solvent-cast counterparts. Although PLA/PEO blends demonstrated enhanced surface hydrophilicity, they exhibited a marked reduction in mechanical properties. Overall, this study demonstrates that electrospinning effectively enhances the flexibility and mechanical performance of PLA-based films by mitigating the effects of poor miscibility in polymer blends and promoting molecular alignment. These findings suggest that electrospinning is a promising processing method for producing PLA-based films with enhanced flexibility and mechanical integrity, without the need for plasticizers or compatibilizers.

Preprint CASE REPORT | doi:10.20944/preprints202410.1284.v1

Autonomous Robot for Road Lines Markings Inspection and Maintenance

Abdulrahman Al-Batati

Subject: Engineering, Mechanical Engineering Keywords: Robotics; Design; Manufacturing; Line Marking; Thesis

Online: 16 October 2024 (11:36:43 CEST)

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According to statistics, the leading cause of death among young people is road car accidents. Moreover, one of the factors for road crashes is low-quality road infrastructure. Road signals are part of the road infrastructure, and they are required for safe driving. Furthermore, road signals are essential for an autonomous mobile machine vision to function properly. Hence, road signals should be clear and transparent in all transportation lanes. Unfortunately, road lane markings – one of the most important signals – fade and deteriorate over time because of the paint quality, weather, and exposure to any external object. Moreover, maintaining those markings manually is considered difficult and tedious by some. Literature review shows few autonomous solutions for such a problem. However, none of the solutions is robust for all kinds of markings. In particular, the literature review shows that the present autonomous solutions require human interference to guide the robot in a specified path to paint a new line where usually the robot will localize itself using GPS. This project targets road markings maintenance with a novel idea to use machine vision for inspecting the line state while moving along the line, and if needed, the robot will repaint the road line. The robot was designed following this idea, and the design can be divided into the following: Driving unit, Paint unit, Vision unit, Control unit, Power unit, UI unit. First, the driving unit is made using a three-wheeled differential drive system, where two wheels are motorized wheels, and the third is a freewheel. Moreover, the painting unit contains an air compressor, an HVLP paint sprayer, a pulley system, and a servo motor. At the same time, the robot vision unit consists of a camera, two IR sensors, and two ultrasonic sensors. Also, the control unit is made of a Raspberry Pi, Arduino, and Motor controllers. Furthermore, the power unit has a 12V lead-acid battery, 48V Li-po battery, four 1.5 batteries, and a power bank. Finally, the UI unit includes a cooling fan and a 10” screen. The software is made of a machine vision code using the OpenCV library in Python language. This code is implemented on the RPI to image process the feed from the camera and then communicate with Arduino using the Serial library. Moreover, Arduino code uses C++ language to decode the message from the RPI and control a relay and a servo for the painting unit and motor controllers for the driving unit. After the design and parts acquisition, the whole system was assembled at home using several manufacturing techniques such as drilling, threading, filing, soldering, 3D printing, adhesion, and zipping. Then, each subsystem was calibrated individually. Finally, the testing phase started for each system individually and ended by testing the system as a whole. In the end, the project progress was hindered by several failed tests. However, it was completed within the timeframe with achieving the main performance measures of the mechanical design/assembly, localization/path planning, road line inspection accuracy, and painting performance.

Preprint ARTICLE | doi:10.20944/preprints202410.1237.v1

Innovative Design and Fabrication of a 3D-Printed Prosthesis Arm for Automated Hand Rehabilitation

Zunaidi Ibrahim, Rahayu Yaakub, Ahmad Elaklouk, Maziri Morsidi, Hazman Piut

Subject: Engineering, Mechanical Engineering Keywords: Prosthesis Arm; 3D-Printing; Additive Manufacturing; Hand Rehabilitation; hemiplegic; Electromyography (EMG)

Online: 16 October 2024 (11:03:39 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.1232.v1

Surface Roughness Analysis of Low-cost Metal Material Extrusion Fabricated Parts and Prediction by Machine Learning Methods

Zhicheng Zhang

Subject: Engineering, Mechanical Engineering Keywords: Additive Manufacturing (AM), Surface Roughness (SR), Low-cost Metal Material Extrusion (LCMME), Machine Learning (ML)

Online: 15 October 2024 (20:37:08 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.1057.v1

Effect of Cryogenic Treatment Applied to Cutting Tool on Machining Parameters and RSM Optimization

Fuat Kara, Aysun Takmaz

Subject: Engineering, Mechanical Engineering Keywords: AISI O2 steel; Cryogenic heat treatment; cutting force; surface roughness; tool wear; RSM optimization

Online: 15 October 2024 (02:54:25 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.1016.v1

On the Game-Based Approach to Optimal Design

Vladimir Kobelev

Subject: Engineering, Mechanical Engineering Keywords: structural optimization; game theory; design under uncertainty

Online: 14 October 2024 (11:07:39 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0868.v1

Study of Parameters Influencing Wrinkles in Deep Drawing of Fiber-Based Materials Using Automatic Image Detection

Yuchen Leng, Cedric Wilfried Sanjon, Qingxiang Tan, Peter Groche, Marek Hauptmann, Jens-Peter Majschak

Subject: Engineering, Mechanical Engineering Keywords: Wrinkle recognition; Deep drawing; Paperboard; Process Parameter; Image identification

Online: 14 October 2024 (05:18:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0861.v1

Unveiling Complex Breakup Dynamics in the Transitional Regime of Entrapped Air within High-Density Media

Muhammad Osama

Subject: Engineering, Mechanical Engineering Keywords: stagnation point; quiescent air filament

Online: 12 October 2024 (07:52:01 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0894.v1

Analysis and Application of DFSS—Design for Six Sigma in the Product Development Process

Gabriele Arcidiacono, Edoardo Risaliti, Francesco Del Pero

Subject: Engineering, Mechanical Engineering Keywords: QFD (Quality Function Deployment); VOC (Voice of the Customer); CTQ (Critical to Quality); competitive benchmarking; project charter; DFSS (Design For Six Sigma)

Online: 11 October 2024 (13:26:51 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0872.v1

Evaluation of the Influence of Surface Roughness Parameters on Ultrasonic Rayleigh Waveforms

Karol Grochalski, Jakub Kowalczyk, Marian Jósko, Michal Wieczorowski

Subject: Engineering, Mechanical Engineering Keywords: Non-destructive testing; ultrasonic testing; surface wave; condition of the surfaces

Online: 11 October 2024 (11:01:55 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0840.v1

Differential Quadrature Free Vibration Analysis of Sandwich Plates with Curvilinear Fiber Variable Stiffness Composite Face Sheets

Zhenyu Zhou, Yi Liu

Subject: Engineering, Mechanical Engineering Keywords: Free vibration; sandwich plate; variable stiffness composite laminates; curvilinear fibers; differential quadrature method

Online: 11 October 2024 (09:42:07 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0834.v1

Numerical Assessment of the Thermal Performance of Microchannels with Slip and Viscous Dissipation Effects

Pamela Vocale, Gian Luca Morini

Subject: Engineering, Mechanical Engineering Keywords: slip flow; viscous heating; noncircular cross-sections; single gas flow

Online: 10 October 2024 (13:59:54 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0624.v1

Mechanical Properties of Two-Dimensional Metal Nitrides: Numerical Simulation Study

Nataliya A. Sakharova, André F.G. Pereira, Jorge M. Antunes

Subject: Engineering, Mechanical Engineering Keywords: 13th group element; metal nitrides; nanosheets; elastic moduli; modelling; numerical simulation

Online: 9 October 2024 (08:37:48 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0619.v1

Virtual Prototyping Based Development of Stepper Motor Design

Georgi Todorov, Konstantin Kamberov, Blagovest Zlatev

Subject: Engineering, Mechanical Engineering Keywords: Virtual prototyping; Physical prototyping; Electric drive; Stepper motor; Permanent magnet

Online: 9 October 2024 (00:08:12 CEST)

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Preprint REVIEW | doi:10.20944/preprints202410.0522.v1

Digital Assistance Systems to Implement Machine Learning in Manufacturing: Current State and Future Directions

Jannik Rosemeyer, Marta Pinzone, Joachim Metternich

Subject: Engineering, Mechanical Engineering Keywords: machine learning; systematic literature review; manufacturing; digital assistance systems; work-based learning

Online: 7 October 2024 (17:33:39 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0390.v1

On the Numerical Investigation of Natural Convection Heat Sinks Across a Wide Range of Flow and Operating Conditions

Louis Dewilde, Syed Mughees Ali, Rajesh Nimmagadda, Tim Persoons

Subject: Engineering, Mechanical Engineering Keywords: Natural Convection; Heat Sink; Turbulence Modelling; Computational Fluid Dynamics; Electronics Cooling

Online: 7 October 2024 (11:32:34 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0287.v1

Lifetime Prediction of Single Crystal Nickel-based Superalloys

Çağatay KASAR, Utku Kaftancıoglu, Emin BAYRAKTAR, Ozgur Aslan

Subject: Engineering, Mechanical Engineering Keywords: Crystal Plasticity; Fatigue; Artificial Neural Networks; Lifetime Assessment Modelling; 18 Turbine Blades

Online: 4 October 2024 (08:14:52 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0280.v1

Design, Control, and Testing of a Multifunctional Soft Robotic Gripper

Ana Correia, Tiago Charters, Afonso Leite, Francisco Campos, Nuno Monge, André Rocha, Mário J.G.C. Mendes

Subject: Engineering, Mechanical Engineering Keywords: soft robotics; multifunctional soft PneuNet actuators; soft robotic gripper; hyperelastic models; Dobot robot

Online: 4 October 2024 (04:15:41 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0205.v1

Predicting Surface Roughness and Grinding Forces in UNS S34700 Steel Grinding: A Machine Learning and Genetic Algorithm Approach to Coolant Effects

Mohsen Dehghanpour Abyaneh, Parviz Narimani, Mohammad Sadegh Javadi, Marzieh Golabchi, Samareh Attarsharghi, Mohammadjafar Hadad

Subject: Engineering, Mechanical Engineering Keywords: mechanical property; surface roughness; grinding force; machine learning; genetics algorithm; digitalization

Online: 2 October 2024 (15:17:14 CEST)

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In the realm of digitalization, data play a crucial role across various scientific fields, from physics to engineering. Analyzing data with advanced technologies like artificial intelligence enhances en-gineers' ability to make informed judgments on product quality. This study aligns with the digital-ization trend by implementing formula generation, generalization, and optimization using genetic algorithms and three machine learning approaches: support vector regression, Gaussian process regression, and artificial neural networks, on a grinding process dataset from a previous study on UNS S34700 steel. The study introduces new approaches by considering three different grinding wheels and four cooling and lubrication solutions as influential process parameters, previously considered qualitative and fixed in earlier literature. Additionally, seven different depths of cut were implemented to measure surface roughness and grinding forces (tangential and normal). Qualitative data were encoded into quantitative data using standard techniques. By enhancing genetic algorithm optimization, a relational formula with 25 coefficients was developed to describe the relationship between input parameters and outputs. Three machine learning algorithms were evaluated for predicting the relationship between predictors and responses. The flexibility and scalability of these methods, combined with the relational formula, provide a sophisticated ap-proach for future expansions. The formula evaluation achieved around 85% accuracy for surface roughness and 90% for grinding forces. In machine learning approaches, the GPR method reached model stability with an R² of around 0.98 and a mean accuracy of 93%, while the ANN reached an R² of around 0.96 and a mean accuracy of 90%. This shows that machine learning approaches are more suitable than formula generalization. The scalability and flexibility of machine learning help generalize with more data variety, while the formula evaluation only accepted current data sets. Furthermore, ML methods achieve high accuracy and are suitable for predicting future data, aligning with digitalization and trend prediction.

Preprint ARTICLE | doi:10.20944/preprints202410.0112.v1

Modeling and Simulation of Fatigue Crack Initiation Process Based on Field Theory of Multiscale Plasticity (FTMP) Part II: Modeling Vacancy Formation and Coupling with Diffusion Analysis

You Xinping, Tadashi Hasebe

Subject: Engineering, Mechanical Engineering Keywords: fatigue; persistent slip band; crack initiation; crystal plasticity; field theory; non-Riemannian plasticity; finite element method; vacancy diffusion; dislocation dynamic

Online: 2 October 2024 (12:00:03 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0031.v2

Modeling and Simulation of Fatigue Crack Initiation Process Based on Field Theory of Multiscale Plasticity (FTMP) Part I: PSB Ladder Formation and Verification

You Xinping, Tadashi Hasebe

Subject: Engineering, Mechanical Engineering Keywords: fatigue; persistent slip band; crack initiation; crystal plasticity; field theory; non-Riemannian plasticity; finite element method; vacancy diffusion; dislocation

Online: 2 October 2024 (11:11:21 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0003.v1

Calculation of Trusses System in MATLAB - Multibody

Štefan Ondočko, Jozef Svetlík, Rudolf Jánoš, Ján Semjon, Miroslav Dovica

Subject: Engineering, Mechanical Engineering Keywords: CAD; FEM; Static Analyses; beam; bars; trusses; MATLAB; SOLIDWORKS

Online: 1 October 2024 (11:56:17 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202410.0031.v1

Modeling and Simulation of Fatigue Crack Initiation Process Based on Field Theory of Multiscale Plasticity (FTMP) Part I: PSB Ladder Formation and Verification

You Xinping, Tadashi Hasebe

Subject: Engineering, Mechanical Engineering Keywords: fatigue; persistent slip band; crack initiation; crystal plasticity; field theory; non-Riemannian plasticity; finite element method; vacancy diffusion; dislocation

Online: 1 October 2024 (11:32:52 CEST)

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Preprint REVIEW | doi:10.20944/preprints202409.2411.v1

Advancing Additive Manufacturing Through Machine Learning Techniques: A State-of-the-Art Review

Shaoping Xiao, Junchao Li, Zhaoan Wang, Yingbin Chen, Soheyla Tofighi

Subject: Engineering, Mechanical Engineering Keywords: additive manufacturing; supervised learning; semi-supervised learning; reinforcement learning

Online: 30 September 2024 (14:31:33 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.2421.v1

A Normal Displacement Model and Compensation Method of Polishing Tool for Precision NC Polishing of Aspheric Surface

Yongjie Shi, Min Su, Qianqian Cao, Di Zheng

Subject: Engineering, Mechanical Engineering Keywords: displacement compensation; NC polishing; aspheric surface; deformation

Online: 30 September 2024 (13:50:23 CEST)

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Preprint REVIEW | doi:10.20944/preprints202409.2348.v1

Digital Engineering: Innovations in Laser Processing Techniques

Serguei Murzin

Subject: Engineering, Mechanical Engineering Keywords: digital models; artificial intelligence (AI); freeform optics; digital twins; laser processing; manufacturing efficiency; photonics

Online: 30 September 2024 (11:47:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.2337.v1

Telehandler Dynamics Analysis using Bond Graph Methodology

Beatriz Puras, Gustavo Raush, Javier Freire, Germán Filippini, Pedro Roquet, Manel Tirado, Oriol Casadesús, Esteve Codina

Subject: Engineering, Mechanical Engineering Keywords: Telehandler; Experimentation; Simulation; Dynamic Model; Multi-solid; Multi-domain; Bond Graph; Coupled Model, Mechanics and Hydraulics.

Online: 30 September 2024 (09:14:20 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.2334.v1

Microstructure Refinement of Bulk Inconel 718 Parts during Fabrication with EB-PBF Using Scanning Strategies: Transition from Bidirectional-Raster to Stochastic Point-Based Melting

Shadman Tahsin Nabil, Cristian Banuelos, Michael Edward Madigan, Sammy Tin, Jacob I Rodriguez, Lawrence E Murr, Ryan B Wicker, Francisco Medina

Subject: Engineering, Mechanical Engineering Keywords: microstructure control; electron beam melting; scanning strategy; Inconel 718; spot melting

Online: 30 September 2024 (08:39:36 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.2359.v1

Multi-Criteria Calibration of a Thermo-Mechanical Model of Steel Plate Welding in Vacuum

Ivo Draganov, Venko Vitliemov, Yuliyan Angelov Angelov, Stiliyana Mileva Mileva, Nikolay Ferdinandov, Danail Gospodinov, Rossen Hristov Radev

Subject: Engineering, Mechanical Engineering Keywords: welding in vacuum; thermo-mechanical model; multicriteria identification; inverse identification problem; adequacy criteria; parameter space investigation method; selection; Salukvadze optimum

Online: 30 September 2024 (07:47:58 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.2382.v1

Optimization of Production Parameters for Impact Strength of 3D-Printed Carbon/Glass Fiber Reinforced Nylon Composite in Critical ZX Printing Orientation

Selim Hartomacioğlu

Subject: Engineering, Mechanical Engineering Keywords:

additive manufacturing; polymer composite; short carbon/glass fiber; nylon

Online: 30 September 2024 (07:39:23 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.2269.v1

Long Short-Term Memory (LSTM) Networks for Automated Identification the Stationary Phase in Tribological Experiments

Yuxiao Zhao, Leyu Lin, Alois K. Schlarb

Subject: Engineering, Mechanical Engineering Keywords: Artificial Neural Network (ANN); Long-Short Term Memory (LSTM); Tribology; Polymer-based composites

Online: 29 September 2024 (11:04:07 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.2219.v1

Analytical Prediction of Multi-Phase Texture in Laser Powder Bed Fusion

Wei Huang, Mike Standish, Wenjia Wang, Jinqiang Ning, Linger Cai, Ruoqi Gao, Hamid Garmestani, Steven Y. Liang

Subject: Engineering, Mechanical Engineering Keywords: LPBF; Analytical simulation; Bunge calculation; Boundary heat transfer; Multi-phase texture

Online: 29 September 2024 (04:11:31 CEST)

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For advancing manufacturing, arising AM, with an inverse philosophical approach compared to conventional procedures, has benefits that include intricate fabrication, reduced material waste, flexible design, and more. Regardless of its potential, AM must overcome several challenges due to multi-physical processes with miscellaneous physical stimuli in diverse materials systems and situations, such as anisotropic microstructure and mechanical properties, a restricted choice of materials, defects, and high cost. Unlike conventional experimental work that requires extensive trial and error resources and FEM, which generally consumes substantial computational power, the analytical approach based on physics is an exceptional choice. Understanding the relationship between the microstructure and material properties of the fabricated parts is a crucial focus in AM research. Texture is a vital factor in almost every modern industry. This study first proposed a physics-based model to foreshadow the multi-phase crystallographic orientation distribution in Ti-6Al-4V LPBF while considering the part boundary conditions due to the importance of part geometry in real industry. The thermal distribution obtained from this function operates as the information for the single-phase crystallographic texture model. In this model, we forerun and validate the orientations of single-phase materials utilizing three Euler Angles with the principles of CET and thermodynamics, as well as the intensity of the texture by approximating them with published results. Then, we transform the single-phase texture into a dual-phase texture in Bunge calculation, illustrating visualized by pole figures of both BCC and HCP phases. This texture evolution model provides a new paradigm for future researchers to model the texture or microstructure evolution semi-analytically and save many computational resources in a real-world perspective. Others have not yet done this work about simulating the multi-phase texture in an analytical approach, so this work bridges the gap in this field. Furthermore, this paper establishes the foundation for future research on materials properties affected by microstructure or texture in academic and industrial environments. The precision and dependability of the results obtained through this method make it a valuable tool for ongoing research and advancement.

Preprint ARTICLE | doi:10.20944/preprints202409.2186.v1

Catastrophic Failure Analysis of a Wind Turbine Gearbox by Finite Element Method and Fracture Analysis

Jairo Aparecido Martins, Estaner Claro Romão

Subject: Engineering, Mechanical Engineering Keywords: Renewable energy; wind turbine; gearbox; catastrophic failure; fatigue

Online: 27 September 2024 (08:07:57 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.2166.v1

Trajectory Planning and Performance Atlases of a New Omnidirectional Conveyor

Zhuo Zhang, Tianyu Sun, Zexing Wang, Xuping Zhang

Subject: Engineering, Mechanical Engineering Keywords: omnidirectional conveyor; kinematic model; trajectory generation; performance atlases

Online: 27 September 2024 (07:51:34 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.2071.v1

Mathematical Modeling and Experimental Tests of Working Parameters of Piston-Radial Pumps in Hydraulic Systems of Mobile Machines

Radovan Petrović, Milan Radosavljević, Boris Žeželj, Duško Belović, Stefan Cvejić

Subject: Engineering, Mechanical Engineering Keywords: mobile equipment; piston-radial pump; mathematical modeling; hydrodynamic processes; pressure; power; energy recovery; sensors; efficiency

Online: 26 September 2024 (09:20:05 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.2088.v1

Modeling and Measurement of Tool Wear During Angular Positioning of a Round Cutting Insert of a Toroidal Milling Tool for Multi-axis Milling

Michał Gdula, Lucia Knapčíková, Jozef Huśar, Radoslav Vandžura

Subject: Engineering, Mechanical Engineering Keywords: angular positioning; torus milling cutter; round cutting insert; tool wear modelling; multi-axis machining; cutting blade working angle; modelling, optical and digital measurements

Online: 26 September 2024 (09:16:19 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.2074.v1

Discrete Modeling of Projectile Penetration into Calcareous Sand Subgrade Runway Pavement Structure and Genetic Algorithm Optimization for Critical Striking Velocity

Chucai Peng, Jingnan Huang, Xichen Sun, Yifei Nan, Yaohui Chen, Kun Chen, Jun Feng

Subject: Engineering, Mechanical Engineering Keywords: runway pavement structure; discrete element method; depth of penetration; genetic algorithm; critical striking velocity

Online: 26 September 2024 (09:10:14 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.2059.v1

Novel Nonlinear Suspension based on the Concept of Origami Metastructures: Theoretical and Experimental Investigations

Antonio Zippo, Moslem Molaie, Giovanni Iarriccio, Francesco Pellicano

Subject: Engineering, Mechanical Engineering Keywords: quasi-zero stiffness; origami-type structure; non-linear stiffness; passive vibration isolator; multibody dynamics; experimental testing; metamaterials

Online: 26 September 2024 (07:46:49 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.2020.v1

Optimisation of Windmill Power Plant Epicyclic Gearbox

Željko Vrcan, Sanjin Troha, Kristina Marković, Dragan Marinković

Subject: Engineering, Mechanical Engineering Keywords: epicyclic gear train; complex planet carrier gear train; multiplier gearbox; comparative analysis; wind power generation; renewable energy; sustainable development (max 10)

Online: 25 September 2024 (12:21:41 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.1893.v1

Characterization and Optimization of Boride Coatings on AISI 1137 Steel: Enhancing Surface Properties and Wear Resistance

Asım Genç, Levent Urtekin, Merdin DANIŞMAZ

Subject: Engineering, Mechanical Engineering Keywords: AISI 1137; thermo-diffusion coating; boron oxide; abrasive wear; thermal analysis; optical image analysis; Taguchi and Anova analysis

Online: 24 September 2024 (10:51:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.1792.v1

Enhanced Energy Harvesting from Thermoelectric Modules: Strategic Manipulation of Element Quantity and Geometry for Optimized Power Output

Chun-I Wu, Kung-Wen Du, Yu-Hsuan Tu

Subject: Engineering, Mechanical Engineering Keywords: Thermoelectric generators; Annular thermoelectric generators; Waste heat recovery; Energy harvesting; Module design and optimization; Energy conversion efficiency; Thermocouple optimization

Online: 23 September 2024 (15:13:26 CEST)

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Preprint REVIEW | doi:10.20944/preprints202404.0826.v2

Global, Layerwise and Multi-scale Modeling in Polymer Matrix Laminated Composites: A Review of Fundamentals, Advances and a Trend Analysis for Future Studies

Marcelo Machado, Felipe Lopes, Noan Simonassi, Eduardo Carvalho, Sergio Monteiro

Subject: Engineering, Mechanical Engineering Keywords: Macromechanics; Mesomechanics; Multiscale analysis; Laminated polymer composites

Online: 22 September 2024 (06:37:41 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.1639.v1

Machine Learning-Based Structural Health Monitoring Technique for Crack Detection and Localisation Using Bluetooth Strain Gauge Sensor Network

Tahereh Shah Mansouri, Gennady Lubarsky, Dewar Finlay, James McLaughlin

Subject: Engineering, Mechanical Engineering Keywords: Structural Health Monitoring; Machine Learning; Bluetooth Low Energy Sensor; Shewhart Chart; Grubbs Test; Hierarchical Clustering; 3D Composite

Online: 21 September 2024 (06:13:34 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.1624.v1

Analysis of the Motion of a Robotic Arm for Fruit Harvesting Using Matlab Software

Maxwell Salazar, Paola Portero

Subject: Engineering, Mechanical Engineering Keywords: Kinematic analysis; Robotic arm; 4 degrees of freedom

Online: 20 September 2024 (16:19:36 CEST)

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Preprint REVIEW | doi:10.20944/preprints202401.1284.v2

Micromechanics for Polymer Matrix Laminated Composites: A Literature Review of Fundamental Models, Advances and a Trend Analysis for Future Researches

Marcelo Vitor Ferreira Machado, Felipe Perissé Duarte Lopes, Noan Tonini Simonassi, Eduardo Atem de Carvalho, Sergio Neves Monteiro

Subject: Engineering, Mechanical Engineering Keywords: micromechanics; polymer laminated composites; heterogeneous material; homogenization

Online: 20 September 2024 (16:17:01 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.1620.v1

Sensitivity of Dynamic Stall Models to Dynamic Excitation on Large-Flexible Wind Turbine Blades in Edgewise Vibrations

Galih Bangga

Subject: Engineering, Mechanical Engineering Keywords: aerodynamics; dynamic stall; engineering model; wind energy; wind turbine

Online: 20 September 2024 (12:44:43 CEST)

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Preprint REVIEW | doi:10.20944/preprints202409.1571.v1

Review on Evaporative Cooling Systems for Application in Buildings in Hot and Dry Climates

Misrak Girma Haile, Roberto Garay Marinez, Ana Macarulla Arenaza

Subject: Engineering, Mechanical Engineering Keywords: Building; Evaporative Cooling System; Hybrid; Effectiveness; Hot-Dry Climate

Online: 20 September 2024 (03:13:22 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.1434.v1

Influence of Process Parameters on the Mechanical Properties of 3D printed Metallic Specimens of Steel 1.2709 and 1.4542

Varun Vashist, Dr. Oldal Istvan, Rawabe Fatima Faidallah, Dr. Zoltan Szakal

Subject: Engineering, Mechanical Engineering Keywords: Additive manufacturing; steel; laser power; laser scan velocity; impact strength; maximum stress

Online: 19 September 2024 (12:07:47 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.1447.v1

Photothermal Conversion Performance of Fe3O4/ATO Hybrid Nanofluid for Direct Absorption Solar Collector

Jeonggyun Ham, Hyemin Kim, Honghyun Cho

Subject: Engineering, Mechanical Engineering Keywords: hybrid nanofluid; optical properties; solar weight absorption coefficient; photothermal conversion coefficient; direct absorption solar collector

Online: 19 September 2024 (07:48:43 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.1420.v1

Decision Analysis Approaches on the Collection Methods of Polyethylene Terephthalate Waste

Johnson A. Oyewale, Lagouge K. Tartibu, and Imhade P. Okokpujie

Subject: Engineering, Mechanical Engineering Keywords: PET waste; AHP; TOPSIS; VIKOR; entropy weights; equal weights

Online: 19 September 2024 (07:39:23 CEST)

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The rising challenge of polyethylene terephthalate (PET) waste necessitates efficient collection methods to mitigate environmental impacts. The Analytic Hierarchy Process (AHP) is one of the Multi-Criteria Decision Analysis (MCDA) approaches utilized in this study. The Technique for Order of Preference by Similarity to the Ideal Solution (TOPSIS) was used to rank each alternative according to the objective weight that AHP had produced. Also, sensitivity analysis was performed to determine how robust the findings were when considering equal weights and entropy weights to maximize PET waste collection techniques. The alternative achieved the objective of obtaining the best collection method, Threshold Plastic Bottle Waste Collection (Tpbw), out of all the three alternatives considered. Another MCDA approach, VIseKriterijumska Optimizacija I Kompromisno Resenje (VIKOR), was used to compare the results and validate the ranking result achieved by the TOPSIS method. The VIKOR technique's validation of the TOPSIS approach showed that the outcomes were highly consistent. Data for the study were gathered from the archives of waste management companies on possible practices of plastic waste collection addressing costs, environmental impacts, social acceptance, feasibility, and efficiency. The findings provide a prioritized framework for enhancing PET waste collection strategies, contributing to sustainable waste management. Many criteria are considered when deciding the best collecting method for PET waste recycling, making it challenging. By using criteria importance, multi-criteria decision analysis (MCDA) was applied in this study, and the objective weight of the criteria was determined using the analytic hierarchy process (AHP). The five criteria considered in this study are Initial investment cost, Operational cost, Transportation cost, Environmental risk, Employment potential, and the objective weights allocated to them. AHP results 0.4952, 0.1997, 0.1565, 0.0870, and 0.0616 are respectively determined.

Preprint REVIEW | doi:10.20944/preprints202409.1412.v1

Design and Development of a Self-Sufficient Riding Reaper Machine

Berisso Woyessa Bekele

Subject: Engineering, Mechanical Engineering Keywords: harvesting; reaper machine; mechanization; cost reduction; efficiency; product development; planning; testing

Online: 18 September 2024 (12:04:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.1244.v1

The Influence of In-Plane Constraints on Fatigue Crack Growth Rate

Jaroslaw Galkiewicz, Urszula Janus-Galkiewicz, Sebastian Lipiec

Subject: Engineering, Mechanical Engineering Keywords: fatigue crack growth; Paris’ law; in-plane constraints; brittle fracture; Williams’ solution

Online: 18 September 2024 (05:17:38 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.1163.v1

An Analysis Comparing the Taguchi Method for Optimizing the Process Parameters of AA5083/Silicon Carbide and AA5083/Coal Composites That Are Fabricated via FSP

Oritonda Muribwathoho, Velaphi Msomi, Sipokazi Mabuwa

Subject: Engineering, Mechanical Engineering Keywords: Aluminium alloys; Composite; Metal Matrix Composite; Mechanical Properties; Friction Stir Welding; Friction Stir Processing; Taguchi; S/N Ratio; ANOVA

Online: 16 September 2024 (10:00:10 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.1062.v1

Multi-Material Topology Optimization on Separate Tetrahedral Meshes with Explicit Design Resolution by means of Remeshing

Robert Renz, Albert Albers

Subject: Engineering, Mechanical Engineering Keywords: multi-material; topology optimization; level set; remeshing; mesh adaption

Online: 14 September 2024 (10:06:41 CEST)

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Preprint REVIEW | doi:10.20944/preprints202409.0946.v1

A Review of Plasma Chemical Surface Treatment on Parylene for Deposition on Ionic Polymers

SHARA KHURSHEED, Dr. Khawaja Moeed, Dr. Zain Khan

Subject: Engineering, Mechanical Engineering Keywords: Nafion117; actuators; parylene; plasma

Online: 12 September 2024 (11:09:08 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.0979.v1

Various Grids in Moiré Measurements

Vladimir Saveljev

Subject: Engineering, Mechanical Engineering Keywords: moiré effect; moiré measurements; moiré magnifier; public safety

Online: 12 September 2024 (08:59:23 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.0807.v1

RANS Simulation of Minimum Ignition Energy of Stoichiometric and Leaner CH4/Air Mixtures at Higher Pressures in Quiescent Conditions

Sooraj Paleli Vasudevan, Siva Muppala

Subject: Engineering, Mechanical Engineering Keywords: minimum ignition energy; single-step mechanism; minimum ignition power; density; high operating pressures; reactingFOAM solver; spherical flames; flame evolution; Arrhenius law

Online: 10 September 2024 (14:19:39 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.0789.v1

A Comparative Data Augmentation-Assisted Diagnostic Framework for Industrial Centrifugal Pumps

Dong-Yun Kim, Akeem Bayo Kareem, Daryl Domingo, Jangwook HUR

Subject: Engineering, Mechanical Engineering Keywords: centrifugal pump; data augmentation; electric motor; fault classification; gaussian noise; PHM

Online: 10 September 2024 (11:07:18 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.0709.v1

The Synthesis of a Two-Circuit Steering Mechanism of the Ackerman Transport Mobile Robot

Amandyk Tuleshov, Yerkebulan Tuleshov, Moldir Kuatova, Aziz Kamal, Daniyar Kerimkulov

Subject: Engineering, Mechanical Engineering Keywords: ackermann transport mobile robot; synthesis; steering mechanism

Online: 10 September 2024 (10:41:13 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.0708.v1

A Proposed Algorithm Based on Variance to Effectively Estimate Crack Source Localization in Solids

Young-Chul Choi, Byun-Young Chung, Doyun Jung

Subject: Engineering, Mechanical Engineering Keywords: Acoustic emission; variance; source localization; crack wave; time of arrival difference

Online: 9 September 2024 (16:46:35 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.0694.v1

Hybrid Biomechanical Design of Dental Implants: Integrating Solid and Gyroid TPMS Lattice Architectures for Optimized Stress Distribution

Dawit Bogale Alemayehu, Masahiro Todoh, and Song-Jeng Huang

Subject: Engineering, Mechanical Engineering Keywords: finite element method; implantology; biomechanical; additive manufacturing; dental implant; osseointegration; hybrid

Online: 9 September 2024 (13:03:49 CEST)

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Dental implantology has evolved greatly as a result of the application of biomechanical engineering concepts, notably the utilization of additive manufacturing technologies that recreate the intricate architecture of real bone. This technique intends to improve functional compatibility with bone tissue while also addressing continuing problems of stress distribution inside dental implants. The research examines two types of dental implants: fully gyroid latticed and hybrid gyroid latticed with a solid neck, comprising three different cell sizes—FI-111, FI-222, FI-333, and their hybrid equivalents HI-111, HI-222, and HI-333. Traditional solid implants often cause stress shielding, which reduces long-term osseointegration and implant durability. Developed using nTopology for lattice configuration and meshing, this design undergoes a comprehensive stress analysis using finite element analysis (FEA). The study seeks to determine the most efficient implant design by maximizing stress distribution and mechanical stiffness. Analyses suggest that hybrid latticed implants, notably the HI-222 type, possess superior mechanical characteristics. These implants successfully balance stiffness and flexibility, reducing stress concentrations and improving stress distribution throughout the implant structure. This balance is critical for decreasing micromotions at the bone-implant interface, boosting osseointegration, and, ultimately, increasing implant longevity and success rates in clinical settings. The paper describes a substantial redesign of dental implants by combining biomechanical engineering and modern additive manufacturing. The novel proposed hybrid structure not only addresses typical challenges such as stress shielding, but it also establishes new standards in implantology, potentially leading to better clinical results and patient quality of life. This complete approach emphasizes the ability of personalized implant designs to fulfill individual clinical demands, indicating a significant improvement in dental treatment technology.

Preprint ARTICLE | doi:10.20944/preprints202409.0690.v1

Impact of Model Knowledge on Acoustic Emission Source Localization Accuracy

Thomas Erlinger, Christoph Kralovec, Christoph Humer, Martin Schagerl

Subject: Engineering, Mechanical Engineering Keywords: acoustic emission; structural health monitoring; localization; model knowledge; dispersion

Online: 9 September 2024 (12:49:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.0340.v1

Enhancing Aerodynamic Performance in UAV Design: CFD Analysis

Mohamed Hamed Moustafa, Hood Salem Khashwain, Sharul Sham Dol, Ahmad Al Ramahi

Subject: Engineering, Mechanical Engineering Keywords: Unmanned Aerial Vehicles (UAV); Aerodynamic Forces; Lift-to-Drag Ratio; CFD

Online: 5 September 2024 (04:51:11 CEST)

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Preprint REVIEW | doi:10.20944/preprints202409.0184.v2

A Review of Vehicles for Fire Suppression

Osman Acar, Eija Honkavaara

Subject: Engineering, Mechanical Engineering Keywords: Wildfire; Firefighting technology; Firefighting vehicles

Online: 4 September 2024 (12:03:07 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.0281.v1

Recovered Foam Impact Absorption Systems

Sara Marcelino-Sádaba, Pablo Benito Hernandez, Miguel Angel Martin Antunes, Pedro Maria Villanueva Roldan, Fernando Veiga

Subject: Engineering, Mechanical Engineering Keywords: foam; impact absorption; recycling; sustainability

Online: 3 September 2024 (16:55:33 CEST)

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Preprint REVIEW | doi:10.20944/preprints202409.0184.v1

A Review of Vehicles for Fire Suppression

Osman Acar, Eija Honkavaara

Subject: Engineering, Mechanical Engineering Keywords: Wildfire; Firefighting technology; Firefighting vehicles

Online: 3 September 2024 (10:58:05 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.0035.v1

An Implementation based on Mask-D3QN of Quadruped Robot Motion for Steam Generator

Biying Xu, Xuehe Zhang, Xuan Yu, Yue Ou, Kuan Zhang, Hegao Cai, Jie Zhao, Jizhuang Fan

Subject: Engineering, Mechanical Engineering Keywords: crawling robot; deep reinforcement learning; motion planning; hierarchical planning

Online: 2 September 2024 (13:13:56 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.2247.v1

Vibration Analysis of Multilayered Quasicrystal Cylindrical Shells, Annular Plates, and Truncated Conical Shells Filled with Fluid

Xin Feng, Han Zhang, Yang Gao

Subject: Engineering, Mechanical Engineering Keywords: cubic quasicrystal materials; truncated conical shells; fluid-structure interaction; fynamic analysis

Online: 30 August 2024 (15:35:07 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.2180.v1

Nonlinear Finite Element Analysis of Bone-Implant Contact in Three Short Dental Implant Models with Varying Osseointegration Percentages

Dawit Bogale Alemayehu, Masahiro Todoh, Song-Jeng Huang

Subject: Engineering, Mechanical Engineering Keywords: Biomechanical; Osseo-integration; Low-density; High-density; Cancellous bone; Short dental implant; Finite element analysis; bone-implant contact

Online: 29 August 2024 (14:26:57 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.2130.v1

Optimization of Solar-Assisted CCHP Systems: Enhancing Efficiency and Reducing Emissions through Harris Hawks-Based Mathematical Modeling

Uchechi Ukaegbu, Lagouge Tartibu, C.W Lim

Subject: Engineering, Mechanical Engineering Keywords: Tri-generation system; exergy efficiency; CO2 emissions

Online: 29 August 2024 (09:16:40 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1981.v1

Study on Structure Damage Identification Methods

Yuantian Qin, Jiahao Ma

Subject: Engineering, Mechanical Engineering Keywords: damage identification; RGA; INFO algorithm; dynamic response transfer-ratio

Online: 28 August 2024 (11:55:18 CEST)

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Preprint REVIEW | doi:10.20944/preprints202408.2047.v1

Microchannel Heat Sink-A Comprehensive Review

Usman Ghani, Muhammad Anas Wazir, Kareem Akhtar, Mohsin Wajib, Shahmir Shoukat

Subject: Engineering, Mechanical Engineering Keywords: Microchannel Heat Sink; Microelectromechanical Systems; Active and Passive Techniques; Efficient Cool-ing Systems

Online: 28 August 2024 (11:47:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.2001.v1

Open-Source Indoor Horizontal Grow Structure Designs

Jun-yu Qian, Joshua M. Pearce

Subject: Engineering, Mechanical Engineering Keywords: indoor growing; grow bins; aeroponic; hydroponic; mechanical design; distributed fabrication; open hardware; controlled environmental agriculture; sustainable agriculture; agriculture

Online: 28 August 2024 (10:44:17 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1994.v1

Thermomechanical and Viscoelastic Characterization of Continuous GF/PETG Tape for Extreme Environment Applications

José Luis Colón Quintana, Scott Tomlinson, Roberto A Lopez-Anido

Subject: Engineering, Mechanical Engineering Keywords: fiber reinforced composites; continuous thermoplastic tape; material characterization; extreme environments; thermomechanical properties; viscoelastic properties

Online: 28 August 2024 (10:38:30 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1989.v1

Characterisation of Al-alloy EN AW-5454

Matjaž Balant, Tomaž Vuherer, Peter Majerič, Rebeka Rudolf

Subject: Engineering, Mechanical Engineering Keywords: Al alloy EN AW-5454; characterisation; microstructure; properties

Online: 28 August 2024 (09:40:25 CEST)

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A complementary characterisation of the Al-alloy EN AW-5454 was carried out, intended for obtaining the laser hybrid welding parameters of sub-assemblies in the automotive industry. The investigation included a microstructural examination, and determination of the alloy's properties using several analytical methods (HV5 hardness measurement, tensile test, Charpy impact toughness, fracture mechanics analysis). Samples were prepared in the longitudinal and transverse directions of a cold-rolled sheet of EN AW-5454 with thicknesses of 3.5 mm and 4 mm. The measured hardness on the thinner sheet was 5% higher than on the thicker sheet. The tensile and yield strength were nominal, while the elongations were smaller by 2.2 - 3.2% for the longitudinal samples and by 2.7 - 13.7% for the transverse samples. The smaller deviations from the nominal values are for the thinner sheet metal. A precise topographical analysis showed brittle fractures of the samples. The Charpy impact toughness results on the thicker plate showed a 20% greater work needed to break it in the longitudinal direction than in the transverse direction. With the thinner sheet metal, 40% greater work was needed. SEM (Scanning Electron Microscope) analysis has shown that the intermetallic Al6(Mn,Fe) particles in the longitudinal samples were mostly intact, with evidence of tough areas on the upper part of the fracture, indicating a better toughness than the specimens in the transverse direction. More crushed intermetallic particles were observed at the fractures of the transverse samples, and their distribution appeared to be more oriented in the direction of rolling. Fracture mechanics SENB (single edge notch bending) tests and their analysis showed that the resistance of the material to crack propagation in the longitudinal sample was about 50% greater than that in the transverse sample. SEM analysis of the fractures showed that the state of the intermetallic particles in the fracture mechanics testing, and the fracture mechanism differed from the one in the Charpy fractures.

Preprint ARTICLE | doi:10.20944/preprints202408.2023.v1

A Strategy of Weak-Connected Grid Search for Noise Filtering and Density Grid-Based Data Clustering

Nang Toan Truong, Sy Dzung Nguyen, Seung-Bok Choi

Subject: Engineering, Mechanical Engineering Keywords: Clustering; Density-based clustering; Density grid-based clustering; Fuzzy approximation

Online: 28 August 2024 (09:06:01 CEST)

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Preprint COMMUNICATION | doi:10.20944/preprints202408.1958.v1

Research on On-Line Monitoring of Grinding Wheel Wear Based on Multi-sensor

Jingsong Duan, Guohua Cao, GuoQing Ma, Zhenglin Yu, Changshun Shao

Subject: Engineering, Mechanical Engineering Keywords: Wheel wear; Acoustic emission; Wavelet packet coefficient Support Vector Machines; Entropy weight evaluation method

Online: 28 August 2024 (02:55:49 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1962.v1

Induced Scratches and Fatigue in Aircraft-Grade Aluminium Alloys. A Statistical Analysis on the UTS and Elongation at Break

Valentin Zichil, Cosmin Constantin Grigoras, Vlad Andrei Ciubotariu

Subject: Engineering, Mechanical Engineering Keywords: aircraft-grade aluminium alloys; induced scratches; low cycle fatigue; statistical analysis

Online: 27 August 2024 (13:43:26 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1886.v1

Dynamic Computation of an Innovative Device for Reducing the Reaction Torque

Stelica Timofte, Zoltan- Iosif Korka, Attila Gerocs, Andrei Komjaty, Florin Bulzan

Subject: Engineering, Mechanical Engineering Keywords: centrifugal forces; chain drive; dynamics; torque

Online: 27 August 2024 (13:07:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1949.v1

Reliability-based Design Optimization for Polymer Electrolyte Membrane Fuel Cells: Tackling Dimensional Uncertainties in Manufacturing and Their Effects on Costs of Cathode Gas Diffusion Layer and Bipolar Plates

Neil Vaz, Kisung Lim, Jaeyoo Choi, Hyunchul Ju

Subject: Engineering, Mechanical Engineering Keywords: polymer electrolyte fuel cell; reliability-based design optimization; dimensional uncertainties; multi-layer perceptron; particle swarm optimization; dimensional tolerance; Monte Carlo simulation; dynamic Kriging surrogate; deterministic design optimization

Online: 27 August 2024 (11:30:33 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1871.v1

Oil Distribution around Ball-Raceway Local Contact Region in Under-Race Lubricating Ball Bearing

Qingcheng Yu, Wenjun Gao, Ping GONG, Yuanhao Li, Can Li

Subject: Engineering, Mechanical Engineering Keywords: numerical simulation; under-race lubrication; ball bearing; local oil distribution; ball-raceway contact

Online: 27 August 2024 (00:46:18 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1696.v1

Dissipation Effects in the Tea Leaf Paradox

Huy Tran, Pooria Pirdavari, Min Y. Pack

Subject: Engineering, Mechanical Engineering Keywords: Tea Leaf Paradox; Separations; Viscous effects; rotational flow; Dissipation

Online: 25 August 2024 (06:23:30 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1628.v1

Cobot Kinematic Model for Industrial Applications

Giorgio Figliolini, Chiara Lanni, Luciano Tomassi

Subject: Engineering, Mechanical Engineering Keywords: Kinematic model; collaborative robotics; robotized cell; industrial application

Online: 23 August 2024 (04:01:53 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1534.v1

Investigating the Performance of Glass Fibre-Reinforced Polymer (GFRP) in the Marine Environment for Tidal Energy: Velocity, Particle Size, Impact Angle and Exposure Time Effects

Talal F. Algaddaime, Emadelddin Hassan, Margaret M. Stack

Subject: Engineering, Mechanical Engineering Keywords: tidal energy; glass-fibre-reinforced polymer (GFRP); erosion impingement rig; marine envi-ronment; scanning electron microscope (SEM); depth profiling analysis; erosion maps

Online: 22 August 2024 (05:45:29 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1511.v1

Elastic Modulus Measurement at High Temperatures for Miniature Ceramic Samples using Laser Micro-Machining and Thermal Mechanical Analyzer

Zhao Zhang, Hai Xiao, Rajendra K. Bordia, Fei Peng

Subject: Engineering, Mechanical Engineering Keywords: Picosecond laser; micromachining; high-temperature ceramics; flexural elastic modulus; alumina; aluminum nitride

Online: 21 August 2024 (11:31:29 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1556.v1

Bionic Optimization Design and Fatigue Life Prediction of Honeycomb Structure Wheel Hub

Na Liu, Xujie Liu, Yueming Jiang, Peng Liu, Yuanyuan Gao, Hang Ding, Yujun Zhao

Subject: Engineering, Mechanical Engineering Keywords: finite element analysis; response surface optimization design; bionic design; fatigue life prediction

Online: 21 August 2024 (11:07:38 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1492.v1

Aluminum‐Modified Plasma Nitriding with High Efficiency and Enhanced Performances

Ze He, Wei Wei, Jing Hu, Jingyi Gu

Subject: Engineering, Mechanical Engineering Keywords: aluminum-modified plasma nitriding; effective hardening layer; compound layer; wear behavior; nitriding efficiency

Online: 21 August 2024 (10:15:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1129.v1

Analysing the Functional Behaviour of Gear Components Made from PA6 Polymer Using Additive Technology

Costin Nicolae ILINCĂ, Ibrahim Naim RAMADAN, Adrian NEACȘA, Eugen Victor LAUDACESCU

Subject: Engineering, Mechanical Engineering Keywords: Polyamide 6 (PA6); 3D Printing; Heat treatments; Annealing; Mechanical properties; Polymer gears; Finite Element Analyses; Numerical Approach; Stress Distributions

Online: 20 August 2024 (04:14:18 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1382.v1

Theoretical Notions with Practical Applications regarding the Statistical Calculation of the Dental Burs Wear

Filip Ilie

Subject: Engineering, Mechanical Engineering Keywords: Dental bur; Lifetime; Reliability; Mass lost; Wear

Online: 20 August 2024 (03:39:37 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1207.v1

Exceptional Strength-Ductility Combinations of a CoCrNi-Based Medium-Entropy Alloy via Short/Medium-Time Annealing after Hot-Rolling

Yongan Chen, Dazhao Li, Zhijie Yan, Shaobin Bai, Ruofei Xie, Jian Sheng, Jian Zhang, Shuai Li, Jinzhong Zhang

Subject: Engineering, Mechanical Engineering Keywords: medium-entropy alloy; precipitates; mechanical properties; deformation mechanisms

Online: 16 August 2024 (08:38:41 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1113.v1

Approaches to Numerical Modelling of Rain Drop Erosion of Wind Turbine Blades: Surface Degradation Issues

Iain Buchanan, Emadelddin Hassan, Margaret M Stack

Subject: Engineering, Mechanical Engineering Keywords: raindrop erosion; wind turbine blades; impact modelling; material degradation; numerical simulation; surface damage; eulerian/lagrangian methods; smoothed particle hydrodynamics (sph); water hammer pressure; renewable energy

Online: 15 August 2024 (12:17:14 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1139.v1

The Designs and Testing of Biodegradable Inserts for Enhanced Crashworthiness in Sports Helmets

Paweł Kaczyński, Mateusz Skwarski, Anna Dmitruk, Piotr Makuła, Joanna Ludwiczak

Subject: Engineering, Mechanical Engineering Keywords: honeycomb; biodegradable polymers; material models; mechanical properties; FEM; tensile test; dynamic test; crashworthiness

Online: 15 August 2024 (10:46:46 CEST)

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