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Preprint ARTICLE | doi:10.20944/preprints202404.1260.v1

Pump System Model Parameter Identification Based on Experimental and Simulation Data

Sheldon Wang, Dalong Gao, Alexandria Wester, Kalyb Beaver, Shanae Edwards, Carrieanne Taylor

Subject: Engineering, Mechanical Engineering Keywords: inverse; optimization; viscoelastic; computation

Online: 18 April 2024 (13:02:05 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.1258.v1

Magnetic Field Analysis and Thrust Verification of Solenoid Actuator Based on Subdomain Method

Mengkun Lu, Zhifang Yuan, Xianglie Yi

Subject: Engineering, Mechanical Engineering Keywords: Solenoid actuator; subdomain method; magnetic vector potential; push-pull electromagnet; movable iron-core

Online: 18 April 2024 (12:30:39 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.1173.v1

Viscoelastic Hertzian Impact — Feature Article

Ivan Argatov

Subject: Engineering, Mechanical Engineering Keywords: impact problem; spherical impactor; Hertzian impact; Maxwell viscoelastic solid; asymptotic model; maximum contact force; impact duration; coefficient of restitution

Online: 17 April 2024 (17:02:43 CEST)

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Preprint REVIEW | doi:10.20944/preprints202404.0826.v1

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: 12 April 2024 (04:54:06 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0823.v1

Interpretability Analysis and Attention Mechanism of Deep Learning-Based Microscopic Vision

Zheng Xu, Xinwei Zhao, Xiaodong Wang, Yuchen Kong, Tongqun Ren, Yanqi Wang

Subject: Engineering, Mechanical Engineering Keywords: microscopic vision; micro-assembly; convolutional neural network; attention mechanism; gradient-weighted class activation mapping

Online: 11 April 2024 (15:18:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0809.v1

Enabling Passive Load-Holding Function and System Pressures Control in a One-Motor-One-Pump Motor-Controlled Hydraulic Cylinder: Simulation Study

Wei Zhao, Morten Kjeld Ebbesen, Michael Rygaard Hansen, Torben Ole Andersen

Subject: Engineering, Mechanical Engineering Keywords: Motor-controlled hydraulic cylinder; four-quadrant operation; system pressures control; passive load-holding function

Online: 11 April 2024 (11:26:28 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0798.v1

A Modified Enthalpic Lattice Boltzmann Method for Simulating Conjugate Heat Transfer Problems in Non-homogeneous Media

Vinicius Akyo Matsuda, Ivan Talão Martins, Debora Carneiro Moreira, Luben Cabezas-Gómez, Enio Pedone Bandarra Filho

Subject: Engineering, Mechanical Engineering Keywords: Thermal lattice Boltzmann method; Neumann boundary condition; Dirichlet boundary condition; Natural Convection; Conjugate Heat Transfer; Structured Cavities.

Online: 11 April 2024 (10:06:51 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.1226.v2

Description of 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; convex holes; stress concentrations; Low Fatigue Cycles; nonlinear behaviour; fuzzy degradation of properties; finite element modeling

Online: 10 April 2024 (07:16:24 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0662.v1

Fatigue Crack Propagation of 51CrV4 Steels for Leaf Springs Suspensions of Railway Freight Wagons

Vítor M. G. Gomes, Grzegorz Lesiuk, José A. F. O. Correia, Abílio M. P. De Jesus

Subject: Engineering, Mechanical Engineering Keywords: railway; rolling stock; freight wagon; leaf springs; fatigue crack growth; fracture surfaces

Online: 9 April 2024 (12:28:44 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0596.v1

Model-Free Adaptive Sliding Mode Control of Shape Memory Alloy Actuated Parallel Platform

Wenlin CHEN, Hong shuai Liu, Meng Liu, Lina HAO

Subject: Engineering, Mechanical Engineering Keywords: Shape memory alloy; Parallel platform; Model-free adaptive control; Sliding mode control

Online: 9 April 2024 (11:01:11 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0617.v1

Study of Self-Excited Thermomechanical Oscillator with Shape Memory Alloys

Ivo Yotov Yotov, Georgi Dimitrov Todorov, Todor Stoilov Todorov

Subject: Engineering, Mechanical Engineering Keywords: self-exited oscillations; vibrations; shape memory alloy, thermomechanical oscillations

Online: 9 April 2024 (10:04:43 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0629.v1

On the determination of elastic properties of single-walled nitride nanotubes using numerical simulation

Nataliya A. Sakharova, André F.G. Pereira, Jorge M. Antunes, Bruno M. Chaparro, Tomás G. Parreira, José V. Fernandes

Subject: Engineering, Mechanical Engineering Keywords: 13th group element; nitride nanotubes; rigidity; elastic moduli; modelling; numerical simulation.

Online: 9 April 2024 (09:58:21 CEST)

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Preprint REVIEW | doi:10.20944/preprints202404.0318.v1

Sensors and Sensing Devices Utilizing Electrorheological Fluids and Magnetorheological Materials – a Review

Yu-Jin Park, Seung-Bok Choi

Subject: Engineering, Mechanical Engineering Keywords: sensors; electrorheological fluid; magnetorheological materials; force sensor; tactile sensor; flux measurement sensor; strain sensor

Online: 4 April 2024 (15:58:42 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0376.v1

Precise Inverse Kinematic Calculation of the Center of Gravity for Bipedal Walking Robots

İsmail Hakkı Şanlıtürk, Hikmet Kocabaş

Subject: Engineering, Mechanical Engineering Keywords: bipedal robot, dynamic walking, open-loop

Online: 4 April 2024 (15:38:08 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0319.v1

A New Type of Hydraulic Clutch with Magnetorheological Fluid: Theory and Experiment

Karol Musiałek, Ireneusz Musiałek, Karol Osowski, Artur Olszak, Aneta Mikulska, Zbigniew Kȩsy, Andrzej Kęsy, Seung-Bok Choi

Subject: Engineering, Mechanical Engineering Keywords: Keywords: magnetorheological fluid (MR); hydraulic clutch operating with MR fluid; rotating magnetic field; rotational speed; particle sizes

Online: 3 April 2024 (16:19:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0311.v1

A non-destructive monitoring method for chlorophyll content of potato plants based on feature reconstruction algorithm

Yaohua Hu, Huanbo Yang, Xiaoyi Shi, Kaili Zhang, Taifeng Guo

Subject: Engineering, Mechanical Engineering Keywords: chlorophyll content estimation; UAV- based multispectral images; NDRE; PCA3 and INDRE.

Online: 3 April 2024 (15:34:08 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0145.v1

Conceptual Design of an Unmanned Electrical Amphibious Vehicle for Ocean and Land Surveillance

Hugo Policarpo, João P. B. Lourenço, António M. Anastácio, Rui Parente, Francisco Rego, Daniel Silvestre, Frederico Afonso, Duarte M. S. Albuquerque, Nuno M. M. Maia

Subject: Engineering, Mechanical Engineering Keywords: Vehicle, Amphibious, Unmanned, Electric vehicle, Conceptual design, Surveillance

Online: 2 April 2024 (10:45:19 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0113.v1

Five-Axis Finish Milling Machining for an Inconel 718 Alloy Monolithic Blisk

Ming-Hsu Tsai, Teng-Hui Chen, Jeng-Nan Lee, Tai-Lin Hsu, Dong-Ke Huang

Subject: Engineering, Mechanical Engineering Keywords: Monolithic blisk; Five-axis machining; Machining parameter; Tool wear

Online: 2 April 2024 (03:08:26 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0101.v1

Research on Sound Source Localisation Method for UAV Detection Based on Improved EMD

Tao CHEN, Jiyan YU, Zhengpeng YANG

Subject: Engineering, Mechanical Engineering Keywords: sound source localisation; EMD dynamic modal decomposition method; signal processing; feature extraction; Chan-Taylor algorithm

Online: 1 April 2024 (14:46:43 CEST)

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Abstract In order to solve the problem that it is difficult to obtain the accurate trigger signal moment when using the time difference of UAV flight acoustic signals collected by acoustic sensors arranged in advance to locate the position of UAVs when they cannot be tracked by radar and are difficult to be observed by the human eye, an acoustic source localisation method with improved empirical modal decomposition (REMD) under an adaptive frequency window is proposed. Firstly, the collected UAV flight signals are smoothed and filtered, then the robust empirical modal decomposition (REMD) is used for IMF modal decomposition and spectral analysis of the collected signals, and a panning frequency window with variable bandwidth is introduced for corresponding frequency locking and extracting the IMFs; the GWO optimisation is used and the sliding metrics are set to determine the position of the panning frequency window automatically; finally, the extracted Finally, the extracted IMF components are reconstructed according to the criterion, and the trigger signal moments in the reconstructed IMF components are resolved and recorded, and the algorithm is used to calculate the difference between the reception moments of different sensors; for the traditional sound source localisation algorithms with a small detection range, which are prone to fall into the no-solution or false-solution, i.e., unable to achieve the localisation, a weighted least-squares-based Chan-Taylor algorithm is proposed for the localisation computation, and a weighted least-squares algorithm is proposed for the localisation computation, through the Inputting the sensor delay parameter and solving the linear equation system to get the target position information; finally, this paper verifies the robustness and performance of the design method with simulated and actual signals. The results show that the maximum positioning error is no more than 5% in an area with a side length of 15m in the measurement area. With the improved accuracy of time delay estimation, the positioning simulation results meet the positioning requirements even though the positioning error is further expanded when the measurement area is further expanded.

Preprint ARTICLE | doi:10.20944/preprints202403.1879.v1

Influence of a Shaft Shoulder on the Torsional Load-Bearing Behaviour of Trochoidal Profile Contours as Positive Shaft–Hub Connections

Author: Masoud Ziaei, Marcus Selzer, Heiko Sommer

Subject: Engineering, Mechanical Engineering Keywords: shaft shoulder; form-fit shaft and hub connections; trochoidal profiled shafts; torsional loaded connection; fretting fatigue

Online: 29 March 2024 (15:43:06 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1858.v1

Micro and Macroscopic Analysis of Fatigue Wear of Gear Wheel Top Layer – an Impact Analysis of Thermochemical Treatment

Piotr Osiński, Włodzimierz Dudziński, Adam Deptuła, Rafał Łuszczyna, Marek Kalita

Subject: Engineering, Mechanical Engineering Keywords: analysis of surface; pitting; thermochemical treatment; residual austenite; gear pump

Online: 29 March 2024 (13:45:45 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1774.v1

Digital Twin-Based Approach for a Multi-objective Optimal Design of Wind Turbine Gearboxes

Carlos Llopis-Albert, Francisco Rubio, Carlos Devece, Dayanis García-Hurtado

Subject: Engineering, Mechanical Engineering Keywords: digital twin; multi-objective optimization; multibody simulation; finite element analysis; structural optimization; wind turbine; gearbox

Online: 28 March 2024 (14:30:15 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1655.v1

Modelling of Real Gas Compression Using the Finite Volume Thermofluid Network Methodology and Mean-Line Approach for Centrifugal Compressors

Ryno Laubscher, Pieter Rousseau, Johan van der Spuy, Colin Du Sart, Johannes P. Pretorius

Subject: Engineering, Mechanical Engineering Keywords: Supercritical CO2; compressor mean line model; finite volume thermofluid network methodology

Online: 27 March 2024 (06:39:20 CET)

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A novel compressible real gas 1D finite volume thermofluid network modelling methodology is proposed that can be applied in the analysis of supercritical CO₂ (sCO2) power cycles. It is applied to simulate centrifugal compressor performance via a mean line approach that directly solves the mass, energy, and momentum balance equations for the discretized flow channels within the machine along with the associated loss models, component characteristics, and applicable compressible real gas equation of state. This can be integrated seamlessly with the rest of the power cycle components like pipes, valves, heat exchangers, etc., thereby eliminating the need for static performance maps and the associated difficulties to ensure similarity over the whole range of operation. This direct simulation of the internal flows also makes it possible to do integrated cycle design optimization that includes the geometry of the compressors, and to simulate fast transients for dynamic analysis. The methodology was applied to simulate well-documented air and sCO2 centrifugal compressors and compared the generated results with that of conventional thermofluid network incompressible and compressible ideal gas approaches. The results indicate that the proposed compressible real gas approach can capture the stagnation pressure changes and isentropic efficiencies with good accuracy for both cases over the whole range of mass flow rates and shaft rotational speeds. In contrast, the conventional thermofluid network incompressible and compressible ideal gas approaches are only applicable in selected regions of the fluid property regime and suffer from discretization errors and inappropriate treatment of the relationship between stagnation and static pressures. Furthermore, comparative analyses between the newly proposed approach and the traditional mechanical energy balance method are performed, showing that the latter approach needs to be discretized more finely through the compression process to correctly capture the polytropic compression path shape, whereas the former more accurately captures the stagnation pressure changes through the analyzed compressors with only a single increment per compressor component.

Preprint ARTICLE | doi:10.20944/preprints202403.1555.v1

A Laboratory Machine Verifying the Operation of a Hydraulic Rope Equalizer with Tensometric Sensors

Leopold Hrabovský, Jiří Fries, Štěpán Pravda

Subject: Engineering, Mechanical Engineering Keywords: tensometric sensor; rope equalizer; mining machine; traction elevator; breaking force; stranded rope

Online: 26 March 2024 (11:36:49 CET)

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In mining machines with friction discs, but also in multi-rope traction elevators, it is necessary to distribute the applied tensile load, generated by the weight of the cage and counterweight, evenly in all cross-sections of the load-bearing ropes. Hydraulic devices used for this purpose can operate on the principle of Pascal's law. The article presents a structural design, a 3D model and an implemented solution of a laboratory device capable of simulating a practical method of evenly distributing the total weight of the load into partial tensile forces of the same size acting on a selected number of load-bearing ropes. The laboratory equipment uses two pairs of three steel cables of finite length for the simulations. During the experimental measurements, tensile forces derived from the tractive force of the piston rods, pushed into the bodies of the hydraulic cylinders by the pressure of the hydraulic oil supplied through the pipeline under the pistons of the hydraulic cylinders, were detected. The resulting amount of hydraulic oil pressure in the hydraulic circuit influenced by different values of the hydraulic oil pressures in the hydraulic cylinders and by the pressure in the supply pipe was experimentally studied on the laboratory equipment. Simulations were also carried out in order to detect the hydraulic oil pressure in the hydraulic circuit caused by the change in the different magnitudes of the tensile forces in the ropes From the experiments carried out, it follows that with the appropriate choice of hydraulic elements and the design of the hydraulic circuit, the weight of the load, acting as the total pulling force in the ropes, can be evenly distributed (with a deviation of up to 5%) to all cross-sections of the load-bearing ropes. If the exact values of the hydraulic oil volumes under the pistons of all hydraulic cylinders are not known, it is not possible to calculate the pressure values in the hydraulic circuit when the valves of the hydraulic pipes are gradually opened.

Preprint ARTICLE | doi:10.20944/preprints202403.1502.v1

Optimization of Process Parameters for Stir Casting of Tib2 Reinforced In-Situ Composites

Xavier Vivek Paul P, Xavier Sethu E, S. PERIYASAMY

Subject: Engineering, Mechanical Engineering Keywords: Metal Matrix Composite; Stir Casting Technique; Optimization; Box-Behnken Design and Process Parameters.

Online: 26 March 2024 (08:25:46 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1304.v1

Experimental Verification of Geometric Changes Caused by the Release of Residual Stresses for Large-Scale Welded Frames

Michał Wieczorowski, Michał Jakubowicz, Lidia Marciniak-Podsadna, Bartosz Gapiński, Roman Barczewski, Bartosz Jakubek, Filip Rogiewicz, Czesław Jermak, Rehan Khan

Subject: Engineering, Mechanical Engineering Keywords: coordinate measuring technique; photogrammetry; vibratory stress relief; residual stresses

Online: 26 March 2024 (02:57:42 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1446.v1

Hardware in the Loop Simulation of Gas Turbines: How Real Time Control System Design Tools Can Be Exploited Also to Generate Fault Cases to Train and Tune Data Based Diagnostic Systems.

Attilio Brighenti, Chiara Brighenti

Subject: Engineering, Mechanical Engineering Keywords: HIL model(s); Dynamic simulation(s); Data-based modelling; Predictive diagnostics; Fault detection and isolation (FDI)

Online: 25 March 2024 (08:30:18 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1405.v1

Effect of Post-Processing Heat Treatment on the Micro-Contact Damage of Zirconia-Reinforced Lithium Silicate Dental Materials

José A. Pérez, Fernando Rodríguez-Rojas, Óscar Borrero-López, Estíbaliz Sánchez-González

Subject: Engineering, Mechanical Engineering Keywords: Dental materials; Lithium silicate; Microstructure; Contact damage; Fracture

Online: 25 March 2024 (07:59:34 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1319.v1

Three-Dimensional Singular Stress Fields and Interfacial Crack Path Instability in Bicrystalline Superlattices of Orthorhombic/Tetragonal Symmetries

Reaz A. Chaudhuri

Subject: Engineering, Mechanical Engineering Keywords: Three-dimensional; Crack; Stress Singularity; bicrystalline superlattice; Orthorhombic; Cubic, Stress Intensity Factor; Energy Release Rate

Online: 22 March 2024 (08:19:42 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1297.v1

Fabrication and Characterisation of Sustainable 3D Printed Parts Using Post-consumer PLA Plastic and Virgin PLA Blends

Mohammad Raquibul Hasan, Ian J Davies, Alokesh Paramanik, Michele John, Wahidul Biswas

Subject: Engineering, Mechanical Engineering Keywords: Additive manufacturing; post-consumer PLA (PC-PLA) waste; blended filament; mechanical properties; circular economy

Online: 22 March 2024 (08:12:34 CET)

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Sustainable manufacturing practices are becoming increasingly necessary due to the growing concerns regarding climate change and resource scarcity. Consequently, material recycling technologies have gradually become preferred over conventional processes. This study aimed to recycle waste polylactic acid (PLA) from household-disposed cups and lids to create 3D-printed parts and promote sustainable manufacturing practices. To achieve this, the current study utilised virgin and post-consumer PLA (sourced from household waste) blends. The PC-PLA wastes were shredded and sorted by size with the aid of a washing step, resulting in a filament with a 1.70 ± 0.5 mm diameter without fragmentation or dissolution. A 50:50 wt.% blend of virgin PLA (vPLA) and PC-PLA was selected as the standard recycling percentage based on previous research and resource conservation goals. The study investigated the impact of three 3D printing parameters (layer height (LH), infill density (I), and nozzle temperature (NT))on the quality of 3D-printed parts using a three-level L9 Taguchi orthogonal array. The findings revealed that blending PC-PLA with vPLA led to significant improvements in the tensile, flexural, and impact strengths by 18.40%, 8%, and 9.15%, respectively, compared to those of recycled PLA. This conclusion was supported by the investigation of the fracture surface area, which revealed fractographic features associated with printing parameters, such as plastic deformation and interfilament debonding. An ANOVA analysis revealed a positive influence of larger layer height and high nozzle temperature on the mechanical properties. Subsequently, the optimal printing parameters (LH: 0.3 mm, I: 100%, and NT: 215 °C) were determined using the S/N ratio, and a confirmation test using the optimum printing parameters exhibited a strong correlation with statistically predicted outcomes. Finally, the study used optimum printing parameters to fabricate 100% post-consumer recycled PLA 3D printed parts, demonstrating their potential for low-strength applications. Based on these findings, it can be concluded that virgin and post-consumer recycled PLA blended filament for fabricating 3D printed components is an effective way to support plastic recycling in the context of a circular economy.

Preprint ARTICLE | doi:10.20944/preprints202403.1333.v1

Prediction of Greenhouse Microclimatic Parameters Using Building Transient Simulation and Artificial Neutral Networks

Olivera Ećim-Đurić, Mihailo Milanović, Aleksandra Dimitrijević Petrović, Zoran Mileusnić, Aleksandra Dragičević, Rajko Miodragović

Subject: Engineering, Mechanical Engineering Keywords: Artificial Neutral Networks; TRNSYS building simulation; greenhouse; temperature; relative humidity

Online: 22 March 2024 (07:26:32 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1250.v1

The Circular Fluid Heating – Transient Entropy Generation

Fikret Alic

Subject: Engineering, Mechanical Engineering Keywords: transient thermal entropy; circular air flow; PTC heaters; longitudinal fins; circular housing

Online: 21 March 2024 (10:42:07 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1258.v1

Evaluation of Powder- and Extrusion- based Metal Additive Manufacturing Processes for the Fabrication of Spare Parts in Electromobility

Alexander Mahr, Tobias Rosnitschek, Thomas Schütt, Stephan Tremmel, Frank Döpper

Subject: Engineering, Mechanical Engineering Keywords: electromobility; additive manufacturing; spare parts supply; process comparison; powder bed fusion of metals via laser beam; metal extrusion-based additive manufacturing

Online: 21 March 2024 (09:17:13 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1242.v1

Effects of Lignin on the Thermal and Morphological Properties and Damages Mechanisms after UV Irradiation of Polypropylene Biocomposites Reinforced with Flax and Pine Fibres: Acoustic Emission Analysis

Zouheyr Belouadah, Khaled Nasri, Lotfi Toubal

Subject: Engineering, Mechanical Engineering Keywords: biocomposites; UV aging; acoustic emission; damage mechanisms; environmental degradation; thermogravimetric analysis

Online: 20 March 2024 (17:03:54 CET)

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Preprint REVIEW | doi:10.20944/preprints202403.1245.v1

A Comparative Review of Models for All-Solid-State Li-Ion Batteries

Erkin Yildiz, Mattia Serpelloni, Alberto Salvadori, Luigi Cabras

Subject: Engineering, Mechanical Engineering Keywords: All-solid-state batteries; Modeling; Multiscale compatibility

Online: 20 March 2024 (15:37:55 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1003.v1

Enhanced Energy Absorption in Bioinspired Combined TPMS-Gyroid and Walled TPMS-Gyroid Lattice Structure Manufactured via Fused Filament Fabrication (FFF)

Dawit Bogale Alemayehu, Masahiro Todoh

Subject: Engineering, Mechanical Engineering Keywords: Keywords; bio-inspired; gyroid lattice, Boolean subtraction; finite element analysis; plastic plateau; densification; energy absorption; relative density; size effect

Online: 18 March 2024 (10:39:43 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0986.v1

Experimental and Numerical Analysis of the Assembling Stresses in Parabolic Leaf Springs for Railway Freight Wagons

Vítor M. G. Gomes, Miguel A.V. de Figueiredo, José A. F. O. Correia, Abílio M. P. de Jesus

Subject: Engineering, Mechanical Engineering Keywords: railway; freight wagon; parabolic leaf springs; assembling stresses; finite element analysis.

Online: 18 March 2024 (10:16:23 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1001.v1

A Study of Interface Bond Strength Following Hot Deformation Bonding of AA6061 at Different Temperatures and Loading Rates

Moty Kayat, Brigit Mittelman, Dvir Fadel, Michael Ben-Haroush, Jacob Bortman, Elad Priel

Subject: Engineering, Mechanical Engineering Keywords: metal forming; hot bonding; interface strength; composite sheets

Online: 18 March 2024 (07:30:55 CET)

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Preprint REVIEW | doi:10.20944/preprints202403.0931.v1

Performance and Challenges of Planetary Roller Screw Mechanism in Complex Conditions: A Comprehensive Review of Recent Progress

Jiacheng Miao, Rui Tang, Xing Du, Bingkui Chen

Subject: Engineering, Mechanical Engineering Keywords: Planetary roller screw mechanism; Structural mechanics; Nonlinear dynamics; Tribological characteristics; Thermal behavior; Reliability assessment;

Online: 15 March 2024 (14:58:37 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0922.v1

Design and Verification of Self-Propelled Electric Tea Seed Planter Based on Orthogonal Test

Luofa Wu, Daogen Chen, Yanqi Wu

Subject: Engineering, Mechanical Engineering Keywords: tea seed; electric; planter; orthogonal test

Online: 15 March 2024 (12:12:06 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0895.v1

Optimization of Process Parameters of Friction Stir Welded Dissimilar Aluminium Alloys (AA6061 and AA8011) Using Response Surface Methodology

Xavier Sethu E, V. SRITHARAN

Subject: Engineering, Mechanical Engineering Keywords: Friction stir welding; Al6061 T6; Al8011; Process Parameters; Box-Behnken; Response Surface Methodology

Online: 15 March 2024 (07:51:49 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0857.v1

A Fault Diagnosis Method for CNC Machine Feed System Based on DoubleEnsemble-LightGBM Model

Yiming Li, Yize Wang, Liuwei Lu, Lumeng Chen

Subject: Engineering, Mechanical Engineering Keywords: CNC machine feed system; variable speed condition; multi-sensor monitoring; ensemble learning; intelligent fault diagnosis

Online: 15 March 2024 (07:03:09 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0868.v1

Sustainability Assessment of Machinery Safety in a Manufacturing Organisation – Supporting Machinery Safety Decision Making with AHP and CART Methods

Hana Pačaiová, Renata Turisová, Juraj Glatz, Daniela Onofrejová

Subject: Engineering, Mechanical Engineering Keywords: machinery safety; multicriteria decision making; AHP; classification and regression trees; CART; safety sustainability; machinery safety decision making

Online: 14 March 2024 (15:49:19 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0824.v1

Development and Optimization of PIR and QIR Maintenance Strategies Using Monte Carlo Method

Khamiss Cheikh, EL Mostapha Boudi, Rabi Rabi, Hamza Mokhliss

Subject: Engineering, Mechanical Engineering Keywords: Maintenance strategies; decision-making; Condition Based Maintenance strategies; Performance & robustness; system with more or less stable behavior; Monte Carlo Method

Online: 14 March 2024 (11:12:17 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0758.v1

Finite Element Analysis versus Empirical Modal Analysis of a Basketball Rim and Backboard

Daniel Winarski, Kip P. Nygren, Tyson Winarski

Subject: Engineering, Mechanical Engineering Keywords: Mode Shape; Frequency; Finite Element Analysis; Modal Analysis

Online: 13 March 2024 (07:59:57 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0719.v1

Mathematical Model of Tapered Thread Profile Made by Turning from Different Machinability Materials

Oleh Onysko, Volodymyr Kopei, Cristian Barz, Yaroslav Kusyi, Saulius Baskutis, Miсhal Bembenek, Predrag Dašić, Vitalii Panchuk

Subject: Engineering, Mechanical Engineering Keywords: cutting edge inclination angle; lathe tool rake angle; lead screw angle; convolute helicoid; oblique helicoid; generator of ruled helicoid

Online: 12 March 2024 (14:19:22 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0721.v1

Mechanics 4.0 and Mechanical Engineering Education

EUSEBIO JIMENEZ LOPEZ, PABLO ALBERTO LIMÓN LEYVA, Armando Ambrosio López, Francisco Javier Ochoa Estrella, Juan José Delfín Vázquez, Baldomero Lucero Vázquez, Víctor Manuel Martínez Molina

Subject: Engineering, Mechanical Engineering Keywords: Industry 4.0; Mechanical Engineering; Engineering Education; Mechanics 4.0

Online: 12 March 2024 (14:06:30 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0665.v1

Mechanical Characterization of Corrugated Board: Sensitivity Analysis in Design of Experiments

Tomasz Garbowski, Jolanta Pozorska, Zbigniew Pozorski

Subject: Engineering, Mechanical Engineering Keywords: sensitivity analysis; material properties; identification; corrugated board; experimental tests ;

Online: 12 March 2024 (13:38:39 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0674.v1

Study and Structural and Tribological Analysis of the Brake Disc-Pads Pair Material

Filip Ilie, Andreea Catalina Cristescu

Subject: Engineering, Mechanical Engineering Keywords: Brake pads; Crystalline structure; Tribological properties; Braking system

Online: 12 March 2024 (08:01:45 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0646.v1

Pin-on-Plate vs. Pin-on-Disk Wear Tests: Theoretical and Numerical Observations on the Initial Transient Phase

Francesca Di Puccio, Andrea Di Pietro, Lorenza Mattei

Subject: Engineering, Mechanical Engineering Keywords: wear test; pin-on-plate; pin-on-disc; flat-on-disc; wear factor; Archard’ s wear law; wear predictive model

Online: 11 March 2024 (18:05:25 CET)

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Preprint ARTICLE | doi:10.20944/preprints202401.1962.v2

Analytical Solution of a Forced Vibrating Tube Transporting Fluid

Moussa Tembely

Subject: Engineering, Mechanical Engineering Keywords: Tube conveying fluid; forced vibration; Analytical solution

Online: 11 March 2024 (10:13:34 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0604.v1

Optimization of sensor placement for modal testing using machine learning

Todd W Kelmar, Maria Chierichetti, Fatemeh Davoudi

Subject: Engineering, Mechanical Engineering Keywords: modal testing; sensor placement; machine learning; finite element method; beam analysis

Online: 11 March 2024 (10:04:42 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0603.v1

Effect of Zinc and Severe Plastic Deformation on Mechanical Properties of AZ61 Magnesium Alloy

Song-Jeng Huang, Sheng-Yu Wu, Murugan Subramani

Subject: Engineering, Mechanical Engineering Keywords: AZ61 Magnesium Alloy; ECAP; heat treatment; Mechanical Properties; Corrosion resistance

Online: 11 March 2024 (09:48:08 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0503.v1

Computational Fluid Dynamics Methodology to Estimate the Drag Coefficient of Balls in Rolling Element Bearings

Yann Marchesse, Christophe Changenet, Fabrice Ville

Subject: Engineering, Mechanical Engineering Keywords: rolling element bearing; drag coefficient; computational fluid dynamics; energy efficiency

Online: 8 March 2024 (11:01:12 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0519.v1

Numerical Modelling of a Female Brain: Effect of the Dura Mater

Joana R Pinto, Sofia M Gonçalves, Fábio A. O. Fernandes, Gustavo Carmo, Matthew B. Panzer, Ricardo Alves de Sousa

Subject: Engineering, Mechanical Engineering Keywords: Finite Element Model; Brain; Traumatic Brain Injury; Female Head Model; Dura Mater

Online: 8 March 2024 (10:28:53 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0462.v1

An Improved Zero-Flowrate Switching Control Method to Reduce Switching Losses in a Hydraulic Actuator

Shuang Peng, Fanglong Yin, Yong Hu

Subject: Engineering, Mechanical Engineering Keywords: hydraulic ; control systems; switching power loss; system efficiency

Online: 8 March 2024 (03:59:38 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0350.v1

Research on the Calculation Method for the Load Distribution of the Dual-Input Counter-Rotating Transmission System

He Yu, Wankai Shi, Zhenhao Su

Subject: Engineering, Mechanical Engineering Keywords: Jacobian-Torsor; Monte Carlo; local parallel chains; three-dimensional tolerances; equal loading

Online: 6 March 2024 (13:18:19 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0087.v2

Design and Fabrication of Adaptable Fixture

Xavier Sethu, Michael Thomas Rex

Subject: Engineering, Mechanical Engineering Keywords: fixture; accuracy; clamping; adaptable; workpiece; locating

Online: 6 March 2024 (10:53:04 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0252.v1

Analysis of Kinematics and Dynamics Performance of a New Type of Three-Pronged Sliding Universal Coupling

Xia Xiu, Degong Chang, Yunpeng Ju, Liang Zheng

Subject: Engineering, Mechanical Engineering Keywords: Three fork type universal coupling; Kinematics; Dynamic performance; The optimal operating angle range

Online: 5 March 2024 (13:56:00 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0221.v1

Developing a YOLOv3-Based Neural Network to Enable Digital Cameras to Detect Features on the Reflective Surface of Objects in Robotic Applications: A Low-Computational Approach with a New Public Dataset

Albin Bajrami, Matteo Claudio Palpaceli

Subject: Engineering, Mechanical Engineering Keywords: Feature Detection; Object Reflective Surfaces; YOLOv3 Neural Network; Transfer Learning; Digital Cameras; Collaborative Robots; Machine Learning in Manufacturing; Automation in Polishing; Industrial AI Applications; GPU; CUDA and cuDNN

Online: 5 March 2024 (13:21:58 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0196.v1

System Identification and Dynamic Analysis of the Propulsion Shaft Systems Using Response Surface Optimization Technique

Aavash Chandra Paudel, Sushil Doranga, Yueqing Li, Mukunda Khanal

Subject: Engineering, Mechanical Engineering Keywords: Propeller Shaft, Vibrations, Optimization, Response Surface

Online: 5 March 2024 (09:18:00 CET)

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For marine vessels, a propeller shaft system, also known as a propulsion shaft system, is an essential changer in engine torque and propeller thrust. The propeller shaft system is subjected to transverse, longitudinal, and torsional excitations during operation. These sources of excitations originate from alternating thrust generated by the propeller, operation of a propeller in a stern flow field which is non-uniform in time and space, misalignment of components such as shafts, bearings, and keyholes in the assembly, excitations in the form of rotational motion, and the whirling motion of the shafts. These dynamic excitations posed a challenging issue for the integrity and reliability of a marine vehicle. Thus, it is crucial to analyze the dynamic response of the propulsion shaft system. The dynamic analysis of the propulsion shaft system is typically conducted using numerical /analytical models. At present, Finite Element Model (FEM) as a numerical model plays a vital role in analyzing the dynamic response of the structure. The computed response and the modal parameters from the FE model are reliable only if accurate boundary conditions, such as stiffness, can be imposed on the model. However, the numerical FE model deviates from the experimental results because of uncertainties in the stiffness values of the bearings and other connectors. This paper uses the Response Surface Optimization (RSO) technique to estimate the unknown stiffness of the bearings used in the propulsion shaft system. The experimental model of the propeller shaft system is constructed from the steady-state response of the system using the step sine excitation. The natural frequencies and the amplitude of vibrations in the FE model are updated using the parametric RSO technique. The updated model shows that the difference in natural frequencies and vibration amplitude is less than 10% between the optimized and experimental models. Propeller Shaft, Vibrations, Optimization, Response Surface

Preprint ARTICLE | doi:10.20944/preprints202403.0229.v1

A Novel Hybrid Approach to the Diagnosis of Simultaneous Imbalance and Shaft-Bow in a Jeffcott Rotor-Bearing System.

Shyh-Chin Huang, Sherina Octaviani, Mohammad Najibullah

Subject: Engineering, Mechanical Engineering Keywords: hybrid approach; multi-fault diagnosis; machine learning; feed-forward neural network

Online: 5 March 2024 (06:36:41 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0171.v1

Piezoresistive Porous Composites with Triply Periodic Minimal Surface Structures Prepared by Self-Resistance Electric Heating and 3D printing

Ke Peng, Tianyu Yu, Pan Wu, Mingjun Chen

Subject: Engineering, Mechanical Engineering Keywords: 3D printing; triply periodic minimal surface; composites; sensors

Online: 4 March 2024 (19:03:03 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0087.v1

Design and Fabrication of Adaptable Fixture

Xavier Sethu

Subject: Engineering, Mechanical Engineering Keywords: fixture; accuracy; clamping; adaptable

Online: 4 March 2024 (05:52:45 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0039.v1

Advancing 3D Dental Implant FEA: Incorporating Biomimetic Trabecular Bone with Varied Pore Sizes in Voronoi Lattices

Dawit Bogale Alemayehu, Masahiro Todoh, Song-Jeng Huang

Subject: Engineering, Mechanical Engineering Keywords: finite element analysis; Voronoi lattice; dental implant; trabecular bone; human mandible’ s; nTopology; Creo Parametric; computer aided design; porosity

Online: 1 March 2024 (12:31:26 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0002.v1

Analytical Theory of Fractional Vibrations

Ming Li

Subject: Engineering, Mechanical Engineering Keywords: Frequency dependent mass or damping or stiffness, fractional inertia or damping or restoration force, equivalent motion equation, multi-fractional Euler-Bernoulli beam

Online: 1 March 2024 (10:30:13 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.1705.v1

New Processing Route for the Production of Functionally Graded 7075 Al/SiCp Composites through the Combination of Semi-Solid Stirring and Sequential Squeeze Casting

Serhan KARAMAN GENC, Nilhan URKMEZ TASKIN

Subject: Engineering, Mechanical Engineering Keywords: metal matrix composites; functionally graded materials; semi-solid stirring; squeeze casting; SiC; aluminum alloys

Online: 29 February 2024 (12:57:41 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.1642.v1

Measuring Device Detecting Impact Forces on Impact Rollers

Leopold Hrabovský, Daniel Kurač, Štěpán Pravda, Eliška Nováková, Tomáš Machálek

Subject: Engineering, Mechanical Engineering Keywords: impact roller; fixed conveyor idler; steel trestle; rubber bracket; vibration; impact force; laboratory equipment.

Online: 28 February 2024 (16:02:43 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.1592.v1

Towards the Isothermal Compression – A Novel Finned Piston-Cylinder with Increased Efficiency

Alfred Rufer

Subject: Engineering, Mechanical Engineering Keywords: gas compression; isothermal; energy efficiency; heat exchange; finned piston

Online: 28 February 2024 (08:38:40 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.1526.v1

Development of Novel Hydraulic 3D Printed Actuator Using Electrorheological Fluid for Robotic Endoscopy

Fabian Sadi, Jan Holthausen, Jan Stallkamp, Marius Siegfarth

Subject: Engineering, Mechanical Engineering Keywords: electrorheological actuator; 3D printing; snake-like endoscopic robot; hydraulic actuation; miniaturized actuator design

Online: 27 February 2024 (12:39:55 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.1491.v1

Numerical Investigation of Micro-gravity Field in a Cylindrical Cell Culture Flask Mounted in a Random Positioning Machine

Praveen Lawrence

Subject: Engineering, Mechanical Engineering Keywords: tissue engineering; random positioning machines (RPMs); computational fluid dynamics(CFD); porous medium

Online: 26 February 2024 (19:49:05 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.1329.v1

High-Precision Integration of Optical Sensors into Metallic Tubes Using Rotary Swaging: Process Phenomena in the Joint Formation

Nassr Al-Baradoni, Phlipp Heck, Peter Groche

Subject: Engineering, Mechanical Engineering Keywords: sensory structure; joining by forming; high accurate joining by forming

Online: 22 February 2024 (17:04:09 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.1272.v1

Steel Sheet Deformation in Clinch‐Riveting Joining Process

Waldemar Witkowski, Jacek Mucha, Łukasz Boda

Subject: Engineering, Mechanical Engineering Keywords: sheet deformation clinch‐rivet joint; GOM measurements; DX51+Z275 steel sheet

Online: 22 February 2024 (12:42:32 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.1261.v1

The Environmental and Economic Importance of Mixed and Boundary Lubrication

Robert Ian Taylor, Ian Sherrington

Subject: Engineering, Mechanical Engineering Keywords: Lubrication; IC Engines; Machine Elements; Friction; Wear; Modelling

Online: 22 February 2024 (07:51:36 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.1259.v1

Extension of the Equivalent Thickness Concept to the Bifurcation of Large Semiconductor Front Side Metal Taiko Wafers Investigated by Ansys Finite Element Analysis Methods

Vincenzo Vinciguerra, Giuseppe Luigi Malgioglio, Marco Renna

Subject: Engineering, Mechanical Engineering Keywords: Bifurcation; Taiko wafers; Finite Element Analysis (FEA); ANSYS; Thermomechanical Simulations; Warpage; Modelling; Equivalent Thickness

Online: 22 February 2024 (07:50:28 CET)

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Scaling up the production of power devices involves, in the semiconductor industry, the use of large semiconductor 8” and 12” wafers of Si or SiC. Their use implicates a successful an effective monitoring and control of wafer warpage, as the geometrical size of the substrate increases, as well as a command control on the degeneration of non-linear warpage into critical phenomena known as bifurcation or buckling.To mitigate the warpage, the use of taiko wafers, which consists of wafers having a thicker region on the rim region of the wafer, has been generally adopted in the production lines. In a previous work [1] we investigated the warpage of taiko wafers by introducing the concept of equivalent thickness, in the linear approximation, for the case of a front side metalized taiko wafer. However, as the thickness of the central semiconductor substrate region decreases the possibility that also the taiko wafer bifurcates emerges. For this reason, in this work we have investigated the occurrence of bifurcation or buckling in a taiko wafer. In particular, we implemented a finite element analysis method by using ANSYS Mechanical Enterprise 2023/R2 to investigate the phenomenon of bifurcation in a taiko wafer. The investigated system consisted of a 200 mm Si (001) front side metalized (FSM) taiko wafer, having a substrate thickness ranging from 100 µm to 400 µm, with a step height fixed to 450 µm. The FSM layer consisted of an Al layer of 4.5 µm thin. The system was subjected to a thermal load such that, getting cooled from a nominal temperature T to 25°C, the metal layer can develop a residual stress. To investigate the bifurcation, an asymmetry was induced in the system by applying a slight force on a point of the circumferential region perpendicularly to the substrate. The temperature investigated ranged from 30 °C to 170 °C. From this investigation, it results that also the bifurcation is mitigated by the taiko structure. Indeed, the bifurcation emerges at higher values of the stresses with respect to the case of flat wafers having the same size and thickness of the substrate. Moreover, the concept of equivalent thickness needs to be reformulated by taking into account of the bifurcation phenomenon. Indeed, from the warpage at the bifurcation point of the taiko wafer, we can determine an overall equivalent thickness of the taiko wafer.

Preprint ARTICLE | doi:10.20944/preprints202402.1269.v1

A Cost-Effective Integrated Methodology for Electromagnetic Actuation via Visual Feedback

Shuwan Chen, Damiano Padovani, Andrea Cioncolini, Angelo Alessandri

Subject: Engineering, Mechanical Engineering Keywords: image processing; optical tracking; position control; magnetic flux; magnetic force; model-based control; feedback control; electromagnet; Arduino; MATLAB Simulink; webcam; microrobots

Online: 22 February 2024 (04:26:17 CET)

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Preprint REVIEW | doi:10.20944/preprints202402.1205.v1

A Review on Sheet Metal Forming Evaluation of Advanced High Strength Steels (AHSS)

Rui Pereira, Nuno Peixinho, Sérgio Luís Costa

Subject: Engineering, Mechanical Engineering Keywords: AHSS; Failure models; FLD/FLC limitations

Online: 22 February 2024 (01:37:49 CET)

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Preprint ARTICLE | doi:10.20944/preprints202108.0087.v10

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: 21 February 2024 (05:13:48 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.1150.v1

Influence of Workpiece Submerging Velocity on Current and Power in Plasma Electrolytic Polishing

Joško Valentinčič, Henning Zeidler, Toni Böttger, Marko Jerman

Subject: Engineering, Mechanical Engineering Keywords: plasma electrolytic polishing (PeP); peak current; average power; process initialisation

Online: 20 February 2024 (14:32:01 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.1098.v1

Optimizing Stainless Steel Bearings: The Impact of Low-Temperature Forming on Bearing Life

Alexander Heinrich Bodewig, Florian Pape, Gerhard Poll

Subject: Engineering, Mechanical Engineering Keywords: bearings; bearing life; cold forming; stainless steel

Online: 20 February 2024 (06:22:04 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0995.v1

Experimental and Numerical Evaluation of Equivalent Stress Intensity Factor Models under Mixed-Mode (I+II) Loading

Estefania Gómez-Gamboa, Jorge Guillermo Díaz-Rodríguez, Jairo Andres Mantilla-Villalobos, Oscar Rodolfo Bohórquez-Becerra, Manuel del Jesús Martínez

Subject: Engineering, Mechanical Engineering Keywords: Equivalent Stress Intensity factor; Low-carbon steel; Mixed Mode I/II; Finite element method (FEM); Boundary element method

Online: 19 February 2024 (08:14:08 CET)

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Preprint REVIEW | doi:10.20944/preprints202402.0824.v1

Research Progress on the Dynamic Stability of Dry Gas Seals

Lanxia Zhang, Xuexing Ding, Shipeng Wang, Shuai Zhang, Junhua Ding

Subject: Engineering, Mechanical Engineering Keywords: dry gas seals; sealing performance; dynamic characteristic；stability；vibration respons

Online: 18 February 2024 (23:34:58 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0837.v1

Design of a Flexure-based Flywheel for Storage of Angular Momentum and Kinetic Energy

Patrick Flückiger, Florent Cosandier, Hubert Schneegans, Simon Henein

Subject: Engineering, Mechanical Engineering Keywords: flexure mechanism; flywheel; energy storage; angular momentum

Online: 15 February 2024 (09:36:04 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0832.v1

Integrated Performance of a Modular Biomass Boiler with a Combined Heat and Power Industrial Rankine Cycle and Supplementary sCO₂ Brayton Cycle

Rashid A. Haffejee, Pieter Rousseau, Ryno Laubscher

Subject: Engineering, Mechanical Engineering Keywords: biomass; supercritical-CO₂; thermofluid process modelling; heat transfer

Online: 15 February 2024 (07:40:42 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0761.v1

Enhancing the Efficiency of Rotary Thermal Propulsion Systems

Xuankun Shen, Aaron W. Costall

Subject: Engineering, Mechanical Engineering Keywords: wankel rotary engines; thermal efficiency; large-eddy simulation; pre-chamber jet ignition; two-stage rotary engine

Online: 15 February 2024 (03:43:17 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0804.v1

Hydrogen-rich syngas production from gasification of sewage sludge: Catalonia case

Sandra Untoria, Abel Rouboa, Eliseu Monteiro

Subject: Engineering, Mechanical Engineering Keywords: Gasification; Syngas; Hydrogen; Sewage sludge; Aspen Plus

Online: 14 February 2024 (11:24:42 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0698.v2

Resistance Feedback for miniaturization of Shape Memory Alloys actuators

Francesco Durante, Terenziano Raparelli, Pierluigi Beomonte Zobel

Subject: Engineering, Mechanical Engineering Keywords: shape memory alloys; control; electrical resistance feedback; soft actuator.

Online: 13 February 2024 (11:46:49 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0698.v1

Resistance Feedback for miniaturization of Shape Memory Alloys actuators

Francesco Durante, Terenziano Raparelli, Pierluigi Beomonte Zobel

Subject: Engineering, Mechanical Engineering Keywords: shape memory alloys; control; electrical resistance feedback; soft actuator.

Online: 12 February 2024 (14:17:37 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0610.v1

Comparing Performance of General Rolled Steel and 3D Printed 316L Stainless Steel

Yao-Tsung Lin, Ming-Yi Tsai, Shih-Yu Yen, Guan-Hua Lung, Jin-Ting Yei, Kuo-Jen Hsu, Kai-Jung Chen

Subject: Engineering, Mechanical Engineering Keywords: additive manufacturing; subtractive manufacturing; metal 3D printing; surface roughness; general rolled steel

Online: 12 February 2024 (10:56:06 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0569.v1

Shot Peening Effect on Wet Sliding Wear in 0.9% NaCl of 17-4PH Stainless Steel Fabricated by Additive Manufacturing

Mariusz Walczak, Aleksander Świetlicki, Mirosław Szala, Marcin Turek, Dariusz Chocyk

Subject: Engineering, Mechanical Engineering Keywords: Additive manufacturing; DMLS; 17-4PH; AISI 630; Shot peening; Wear; Tribology

Online: 9 February 2024 (11:30:19 CET)

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17-4PH steel is a widely used grade for precipitation hardening. The growing demand for modern materials with high corrosion and tribological resistance has led to its increased use for the production of medical devices. With additive manufacturing (AM), complex functional shapes can be achieved for medical applications. Direct laser metal sintering (DMLS) technology makes it possible to obtain products with complex architectures, but it also faces various challenges, including imperfections in the surface layer of products due to the use of 3D printing technology itself. This study analyzed the abrasive wear resistance in 0.9% NaCl solution of 17-4PH steel produced by DMLS technology. In order to improve the properties of the surface layer after 3D printing and to improve the tribological wear resistance of the steel, a shot peening (SP) process using CrNi shot and ceramic beads (based on ZrO2) was applied. The chemical and phase composition of the materials obtained, Vickers hardness, surface roughness, and microscopic and SEM imaging were investigated. Tribological tests were carried out using the ball-on-disc method, and the surfaces that showed traces of abrasion to identify wear mechanisms were subjected to SEM analysis. The chemical composition was in accordance with the EOS manufacturer's declarations, and the presence of austenite and martensite was found in the post-production state, while a higher content of martensitic phase was found in the case of peened samples due to phase transformations. The surface hardness of the peened samples increased more than twice, and the post-treatment roughness increased by 12.8% after peening CrNi steels and decreased by 7.8% after peening ZrO2 relative to reference surfaces. Roughness has an identifiable effect on sliding wear resistance. Higher roughness promotes material loss. After the SP process, the coefficient of friction increased by 15.5% and 20.7%, while the wear factor (K) decreased by 25.9% and 32.7% for the samples peened with CrNi steels and ZrO2, respectively. Abrasive and adhesive mechanism were dominant featured with slight fatigue. The investigation showed a positive effect of SP on the tribological properties of DMSL 17-4PH.

Preprint ARTICLE | doi:10.20944/preprints202402.0514.v1

Experimental Analysis of a Polygeneration System: Assessment of the Thermal Sub-system

Andre Rodrigues, Ana Palmero-Marrero, Joao Soares, Szabolcs Varga, Armando Coelho Oliveira

Subject: Engineering, Mechanical Engineering Keywords: polygeneration; solar; ejector; thermal storage; cooling; heating

Online: 9 February 2024 (02:39:13 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0481.v1

A Machine Learning-Driven Modeling and Optimization Approach for Enhancing Cassava Mash Production Quality in Cassava Graters.

Nana Yaa Serwaah Sarpong, Joseph Oppong Akowuah, Joseph Ofei Darko, Eric Amoah Asante

Subject: Engineering, Mechanical Engineering Keywords: machine learning prediction; cassava grating; performance modeling; mash quality

Online: 8 February 2024 (09:43:15 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0474.v1

Enhancing Vehicle Lightweight Design Process with Genetic Algorithm-Optimized BP Neural Network and Topology Optimization: A Comprehensive Study

Shengzhao Liao, Li Zhong, Liu Yi

Subject: Engineering, Mechanical Engineering Keywords: lightweight design of vehicle technology; genetic algorithm; BP neural network; topology optimization; design parameter optimization

Online: 8 February 2024 (07:16:52 CET)

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Amid the swift progression of the global automobile industry, the aspiration for lightweight vehicle design has surfaced as a crucial approach to boost fuel efficiency and curtail environmental impact. The objective of this study revolves around achieving holistic optimization of vehicle structure via detailed scrutiny of vehicle process characteristics, amalgamated with a Back Propagation neural network (BPNN) optimized by a genetic algorithm (GA) and a topology optimization (TO) method.The process initiates with an examination of the vehicle's technical characteristics, succeeded by an optimization protocol that couples GA with BPNN. This exhaustive optimization procedure derives the best-fit values of design parameters and identifies the globally optimal lightweight design approach. Subsequently, a comprehensive structural optimization is actualized by modifying the topological distribution of the structure.A simulation experiment of the conceptual car body beam skeleton is conducted as a conclusive step, and the anti-collision capacity of the car body beam skeleton is assessed by measuring deformation intrusion. The findings reveal that in the vehicle topology optimization, a comparative analysis of pre and post-optimization results indicates an improved topological density across diverse sections. The topological density of the vehicle's frontal structure escalates from 0.75 to 0.8. Following optimization, the stiffness assessment records a marginal increase (within the range of 0.02–0.05), implying that the lightweight design does not compromise the general rigidity of the structure.The optimized body structure manifests superior crashworthiness in the crash test: the deformation intrusion diminishes by 27% in front-end collisions. In side impacts, the deformation and intrusion at critical points are reduced by 13.15% to 10% respectively. The comprehensive method proposed herein proves to be an efficient strategy to actualize the lightweight design of vehicles.

Preprint ARTICLE | doi:10.20944/preprints202402.0486.v1

Predicting Surface Roughness in Turning Complex-Tructured Workpieces Using Vibration Signal-Based Gaussian Process Regression

Jianyong Chen, Jiayao Lin, Ming Zhang, Qizhe Lin

Subject: Engineering, Mechanical Engineering Keywords: surface roughness; vibration signal analysis; Gaussian Process Regression; Daubechies Wavelet Packet Transform; Complex-Structured Workpieces

Online: 8 February 2024 (05:18:31 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0423.v1

Magnetorheological Polishing Based on Honing Vertical Mechanism for Inner Surface of Titanium Alloy Pipes

Wanli Song, Zhen Yang, Dezhi Meng, Na Wang, Seung-Bok Choi

Subject: Engineering, Mechanical Engineering Keywords: magnetorheological polishing fluid; vertical magnetorheological polishing; internal surface; simulation analysis; surface roughness

Online: 7 February 2024 (08:46:46 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0376.v1

Turbulent Channel Flow: Direct Numerical Simulation-Data-Driven Modeling

Antonios Liakopoulos, Apostolos Palasis

Subject: Engineering, Mechanical Engineering Keywords: Wall-bounded turbulence; turbulent boundary layers; higher order statistics; Direct Numerical Simulation (DNS)

Online: 7 February 2024 (02:11:42 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0180.v2

Theoretical and Numerical Investigation of Mechanical Properties of Auxetic S-structure under Transverse Load

Prasanna Mondal, Jayaganthan R.

Subject: Engineering, Mechanical Engineering Keywords: Negative Poisson’ s Ratio; Timoshenko Beam Theory; Semi-analytical model; Parametric Analysis; Elastic modulus; Transverse load

Online: 6 February 2024 (10:28:34 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0312.v1

Improving Hardenability Modeling: A Bayesian Optimization Approach to Tuning Hyperparameters for Neural Networks Regression

Wendimu Fanta Gemechu, Wojciech Sitek, Gilmar Ferreira Batalha

Subject: Engineering, Mechanical Engineering Keywords: steel hardenability; Bayesian optimization; k-fold cross-validation; hyperparameter tuning; neural networks regression; steel alloy; predictive model; heat treatment; hardenability band; Jominy end-quench

Online: 6 February 2024 (09:17:47 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0278.v1

A Stiffness Approach for Coupling Structural and Magnetic Models for the Design and Optimization of Radial Flux PM Generators for Sustainable Direct-Drive Wind Turbines

Alasdair McDonald, Pablo Jaen-Sola

Subject: Engineering, Mechanical Engineering Keywords: Direct-drive; Radial Flux Permanent Magnet Generator; Structural & Magnetic; Stiffness; Analytical & FEA

Online: 5 February 2024 (11:13:29 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0180.v1

Theoretical and Numerical Investigation of Mechanical Properties of Auxetic S-structure under Transverse Load

Prasanna Mondal, Jayaganthan R.

Subject: Engineering, Mechanical Engineering Keywords: Negative Poisson’s Ratio; Timoshenko Beam Theory; Semi-analytical model; Parametric Analysis; Elastic modulus; Transverse load

Online: 2 February 2024 (16:04:23 CET)

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