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Preprint ARTICLE | doi:10.20944/preprints202209.0304.v1

Modeling of PV Cell, PV Module, PV Array and PV IV Characteristics Analysis Using MATLAB/SIMULINK

Arnob Das, Susmita Peu

Subject: Engineering, Mechanical Engineering Keywords: photovoltaic cell; photovoltaic module; photovoltaic panel; photovoltaic array; current-voltage (I-V) characteristic curve; power-voltage (P-V) characteristic curve

Online: 20 September 2022 (10:25:43 CEST)

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Preprint COMMUNICATION | doi:10.20944/preprints202209.0270.v1

A Comparative Investigation on Mechanical Properties of Tib₂/Cr Multilayer Film by Indentation

Simeng Chen, Zhengtao Wu, Qimin Wang

Subject: Engineering, Mechanical Engineering Keywords: TiB2/Cr; Multilayer; Mechanical properties; Coherent interface

Online: 19 September 2022 (08:37:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202209.0160.v1

Design and Shape Optimization of Strain Gauge Load Cell for Axial Force Measurement for Test Benches

Omar Sabah Al-Dahiree, Mohammad Osman Tokhi, Nabil Hassan Hadi, Nassar Rasheid Hmoad, Raja Ariffin Raja Ghazilla, Hwa Jen Yap, Emad Abdullah Albaadani

Subject: Engineering, Mechanical Engineering Keywords: Strain gauge load cell; machine design; axial force measurement; force test bench; shape optimiza-tion; finite element method (FEM); Wheatstone bridge; amplifier circuit; calibration test

Online: 13 September 2022 (05:47:32 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201812.0164.v2

Radiation Effect Modeling for Controlling Heat Transfer in the Shape Memory Alloy

Amine Riad, Mouna Ben Zohra, Abdelilah Alhamany, Mohamed Mansouri

Subject: Engineering, Mechanical Engineering Keywords: Shape memory alloy; SMA; Smart material; Radiation effect; solar radiation effect; radiation heat

Online: 8 September 2022 (09:02:46 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202209.0088.v1

Numerical Simulation of the Elastic-Ideal Plastic Material Behavior of Short Fiber-Reinforced Composites Including Its Spatial Distribution with an Experimental Validation

Natalie Rauter

Subject: Engineering, Mechanical Engineering Keywords: Short fiber-reinforced composite; Random fields; Plasticity; Numerical simulation

Online: 6 September 2022 (10:11:54 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202209.0075.v1

Influence of a Flat Polyimide Inlay on the Propagation of Guided Ultrasonic Waves in a Narrow GFRP-Specimen

Liv Rittmeier, Thomas Roloff, Natalie Rauter, Andrey Mikhaylenko, Jan Niklas Haus, Rolf Lammering, Andreas Dietzel, Michael Sinapius

Subject: Engineering, Mechanical Engineering Keywords: structural health monitoring; narrow specimen; guided ultrasonic waves; continuous wavelet transformation; numerical simulation; composite materials; GFRP

Online: 6 September 2022 (03:06:43 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202208.0512.v1

Snow contact characterisation of cross-country skis: A macro-scale study of the apparent contact

Kalle Kalliorinne, Joakim Sandberg, Gustav Hindér, Roland Larsson, Hans-Christer Holmberg, Andreas Almqvist

Subject: Engineering, Mechanical Engineering Keywords: Contact Mechanics; Cross-Country Skiing; Cross-Country Ski; Load Conditions; Ski-Camber Profile; Sports Equipment

Online: 31 August 2022 (02:26:22 CEST)

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In cross-country skiing the time difference between a race winner and the person coming second is typically very small. Since much of the energy is spent on overcoming resistive forces, a relatively small reduction of these can have a significant impact on the results. The resistive forces come partly from the friction in the tribological interface, between the ski and the snow, and as with many tribological applications the characterisation of its origin, plays an important role in determining the frictional properties. Also in cross-country ski friction, there are several scales impacting the frictional performance, with the major contributors being the ski-camber profile and ski-base structure. Macro-scale measurements of the ski's camber profile under load, are often used to determine how adequate the ski is for a specific condition. The characteristic properties usually obtained are, the force required to collapse the ski to a certain camber height, the topography of the kick-wax zone, and by simple means a determined lengths of the frictional interface, i.e., the apparent contact length. To this date, there are some mathematical models, but there is no robust way of determining the macro-scale contact properties between a cross-country ski and a counter surface using simulations. In the present paper an Artificial neural networks (ANN) is trained to predict the ski-camber profile for various loads placed at different positions, and a well established deterministic approach is used to simulate the contact between the ANN-predicted ski-camber profile and a linearly elastic body with a flat surface, representing the snow. The results suggest that this method is feasible for the determination of the apparent contact characteristics of different skis. Moreover, we show that the apparent contact area does not linearly depend on the load, and that the elastic properties of the counter surface also has a large impact on the apparent contact area and the average apparent contact pressure.

Preprint ARTICLE | doi:10.20944/preprints202208.0490.v1

Inference of Pulmonary Arterial Pressure using Non-invasive Measurements and Scientific Machine Learning Techniques

Ryno Laubscher, Johan Van Der Merwe, Philip G. Herbst, Jacques Liebenberg

Subject: Engineering, Mechanical Engineering Keywords: cardiovascular 0-D model; pulmonary arterial pressure; gradient-based optimization; automatic differentiation

Online: 29 August 2022 (10:57:18 CEST)

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Preprint REVIEW | doi:10.20944/preprints202208.0434.v1

The Unprecedented Role of 3D Printing Technology in Fighting the Covid-19 Pandemic: A Comprehensive Review

Y.C. Niranjan, S.G. Channabasavanna, Shankar Krishnapillai, Velmurugan R, A. Rajesh Kannan, Dhanesh G. Mohan, Sasan Sattarpanah Karganroudi

Subject: Engineering, Mechanical Engineering Keywords: COVID-19; 3D Printing; Additive Manufacturing; Medical Applications; Open-source files; Innovation

Online: 25 August 2022 (10:24:14 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202208.0361.v1

Design and Characterizing of Blower Wind Tunnel Using CFD

Itimad Azzawi

Subject: Engineering, Mechanical Engineering Keywords: Blower wind tunnel design; CFD; Boundary layer controller; Turbulent intensity Validation; Power spectral density (PSD)

Online: 19 August 2022 (08:31:04 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202208.0328.v1

Polyetherimide Reinforced Smart Inlays for Bondline Surveillance in Composites

Chresten Von der Heide, Julian Steinmetz, Oliver Völkerink, Patrick Makiela, Christian Hühne, Michael Sinapius, Andreas Dietzel

Subject: Engineering, Mechanical Engineering Keywords: thin-film sensors; foil sensors; composite structures; structural bonding; multifunctional bondline; function conformity; sensor integration; structural health monitoring

Online: 18 August 2022 (03:41:32 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202208.0304.v1

Liquid Smoke Treatment for Natural Fibers: The Effect on Tensile Properties, Surface Morphology, Crystalline Properties, and Functional Groups of Banana Stem Fibers

Mukhlis Muslimin, Mustamin Rahim, Ahmad Seng, Sandi Rais

Subject: Engineering, Mechanical Engineering Keywords: Banana stem fiber; tensile strength; morphology; crystalline properties; functional groups; light weight; environmentally friendly

Online: 17 August 2022 (05:48:26 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202208.0156.v1

Static Load Characteristics of Hydrostatic Journal Bearings: Measurements and Predictions

Howon Yi, Hyunsung Jung, Kyuman Kim, Keun Ryu

Subject: Engineering, Mechanical Engineering Keywords: Hydrostatic bearings; Journal bearings; Static load characteristics; Measurements; Predictions

Online: 8 August 2022 (10:57:53 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202208.0075.v1

Waste Plastic Direct Extrusion Hangprinter

Aliaksei Petsiuk, Bharath Lavu, Rachel Dick, Joshua M. Pearce

Subject: Engineering, Mechanical Engineering Keywords: 3D printing; additive manufacturing; big area additive manufacturing; BAAM; hanging printer; hangprinter; plastic waste; recycling; sustainable manufacturing; wire robot

Online: 3 August 2022 (07:17:07 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202208.0063.v1

Buckling Behavior of Different Types of Spherical Weave Structures Under Vertical Compression Loads

Guangkai Song, Bohua Sun

Subject: Engineering, Mechanical Engineering Keywords: Spherical weave structure; In-plane curvatures; Buckling; Test; Buckling load

Online: 2 August 2022 (10:22:30 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202207.0368.v1

Systems Design and Integration of Small Scale Nano and Picosatellites

Philip Naumann, Joshua S. Umansky-Castro, Mason Peck, Timothy Sands

Subject: Engineering, Mechanical Engineering Keywords: Systems Engineering; Kane Damper; Forward Error Correction; Matched Filtering

Online: 25 July 2022 (09:35:15 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202206.0001.v2

Effect of Sintering Temperature on the Properties of CuAlO₂ Synthesized from Nanosized Precursors for Application in Smart Infrastructure Systems

Shabnam Ghotbi, Mohammad Abbas Mousa, Lateef N Assi, SeyedAli Ghahari

Subject: Engineering, Mechanical Engineering Keywords: copper aluminum oxide; sintering; electrical conductivity; activation energy

Online: 21 July 2022 (02:53:40 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202207.0195.v1

Co-Creating a Framework to Integrate Sustainable Design into Product Development Practice: Case Study at an Engineering Consultancy Firm

Tejaswini Chatty, Will Harrison, Hana H. Ba-Sabaa, Jeremy Faludi, Elizabeth L. Murnane

Subject: Engineering, Mechanical Engineering Keywords: sustainable product development; sustainable design; product development practice; corporate sustainability practices

Online: 13 July 2022 (09:12:47 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202207.0184.v1

Bending Stresses and Deformations in Prismatic Profiled Shafts With Noncircular Contours Based on Higher Hybrid Trochoids

Masoud Ziaei

Subject: Engineering, Mechanical Engineering Keywords: higher trochoids; noncircular cross sections; profiled shafts; form-fit shaft and hub connections; bending stress; bending deflection; rotating bending stress

Online: 12 July 2022 (09:27:59 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202206.0358.v1

Unsteady Natural Convection in An Initially Stratified Air-filled Trapezoidal Enclosure Heated from below

Md. Mahafujur Rahman, Sidhartha Bhowmick, Rabindra Nath Mondal, Suvash Chandra Saha

Subject: Engineering, Mechanical Engineering Keywords: stratified air; trapezoidal cavity; natural convection; heat transfer; transient flow

Online: 27 June 2022 (10:02:45 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202206.0330.v1

Determining the Severity of Open and Closed Cracks Using the Strain Energy Loss and the Hill-Climbing Method

Cristian Tufisi, Catalin V. Rusu, Nicoleta Gillich, Marius Vasile Pop, Codruta Oana Hamat, Christian Sacarea, Gilbert-Rainer Gillich

Subject: Engineering, Mechanical Engineering Keywords: crack severity; strain energy loss; beam deflection; frequency shift; hill-climbing method

Online: 24 June 2022 (04:46:40 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202206.0254.v1

Numerical Study on the Effect of Deposits Layer on the Minimum Wall Thickness of Boiler Water Tube Under Different Operating Conditions

Ahmed S. Aljohani, Khaled I. Ahmed, Saeed Asiri, Mohamed H. Ahmed

Subject: Engineering, Mechanical Engineering Keywords: steam boiler; water tube; deposit layer; tube wall thickness; wall tube thermal conductivity, thermo-mechanical performance

Online: 17 June 2022 (10:11:56 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202206.0245.v1

MEMS Vibrometer for Structural Health Monitoring Using Guided Ultrasonic Waves

Jan Niklas Haus, Walter Lang, Thomas Roloff, Liv Rittmeier, Sarah Bornemann, Michael Sinapius, Andreas Dietzel

Subject: Engineering, Mechanical Engineering Keywords: MEMS vibrometer; Structural Health Monitoring (SHM); Guided Ultrasonic Waves (GUW); Fiber Metal Laminates (FML); wafer bonding

Online: 17 June 2022 (03:55:30 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202206.0200.v1

Design of a Compact Energy Storage with Rotary Series Elastic Actuator for Lumbar Support Exoskeleton

Omar Sabah Al-Dahiree, Raja Ariffin Raja Ghazilla, Mohammad Osman Tokhi, Hwa Jen YAP, Emad Abdullah Albaadani

Subject: Engineering, Mechanical Engineering Keywords: Augmentation,; exoskeleton; lifting strategy; lumbar support; SEA; series elastic actuator; spiral spring; machine design

Online: 14 June 2022 (08:50:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202206.0191.v1

Dynamic Model Used for Describing the Coupled Vibration of Gear Pair and Bearing in the Gearbox

Shuping Yan, Peng Dai, Da Shu, Jianbin Wang, Jie Sun, Dabin Zhang, Hongwei Li

Subject: Engineering, Mechanical Engineering Keywords: gearbox; dynamic model; harmonic response; input speed; coupled vibration

Online: 14 June 2022 (04:13:21 CEST)

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Preprint TECHNICAL NOTE | doi:10.20944/preprints202206.0182.v1

Heat Transfer Equipment for Space Shuttle Orbiter, Its Main Engine (Aerojet Rocketdyne RS 25), Thermal (Passive and Active), Environmental Control and Life Support System

Muhammad Musaddique Ali Rafique

Subject: Engineering, Mechanical Engineering Keywords: heat transfer; thermodynamics; evaporation; condensation; regeneration

Online: 13 June 2022 (10:07:32 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202206.0171.v1

Design and Manufacture of a Flexible Pneumatic Soft Gripper

Jing Lei, Zhenghao Ge, Pengju Fan, Wang Zou, Tao Jiang, Liang Dong

Subject: Engineering, Mechanical Engineering Keywords: soft robot; pneumatic drive; soft gripper; 3D printing

Online: 13 June 2022 (08:09:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202206.0088.v1

A Comprehensive Energy Model for an Optimal Design of a Hybrid Refrigerated Van

Angelo Maiorino, Adrián Mota-Babiloni, Fabio Petruzziello, Manuel Gesù Del Duca, Andrea Ariano, Ciro Aprea

Subject: Engineering, Mechanical Engineering Keywords: Refrigerated transport; Photovoltaic panels; Electrical batteries; Thermal model; Cold chain; Carbon emissions

Online: 6 June 2022 (13:14:34 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202206.0025.v1

Numerical Analysis of the Main Wave Propagation Characteristics in a Steel-CFRP Laminate Including Model Order Reduction

Andrey Mikhaylenko, Natalie Rauter, Nanda Kishore Bellam Muralidhar, Tilmann Barth, Dirk A. Lorenz, Rolf Lammering

Subject: Engineering, Mechanical Engineering Keywords: guided ultrasonic waves; fiber metal laminate; dispersion diagram; displacement field

Online: 2 June 2022 (04:41:42 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202205.0402.v1

Incorporation of Torsion Springs in a Knee Exoskeleton for Stance Phase Correction of Crouch Gait

Katy Bumbard, Harold Herrington, Chung-Hyun Goh, Alwathiqbellah Ibrahim

Subject: Engineering, Mechanical Engineering Keywords: crouch gait; torsion springs; knee exoskeleton; stance phase; gait rehabilitation

Online: 30 May 2022 (11:41:03 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202205.0337.v1

Experimental Study into Optimal Configuration and Operation of Two-Four Rotor Coaxial Systems for e-VTOL Vehicles

Jubilee Prasad Rao, Jonathan E. Holzager, Marco Maia, F. Javier Diez

Subject: Engineering, Mechanical Engineering Keywords: e-VTOL vehicles; coaxial rotors; design optimization; operation; experiments; electric propulsion; propeller pitch

Online: 25 May 2022 (03:34:42 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202205.0326.v1

Buckling Behavior of Different Types of Woven Structures Under Axial Compression Loads

Guangkai Song, Bohua Sun

Subject: Engineering, Mechanical Engineering Keywords: In-plane curvatures; Buckling; Woven structure; 3D print; Gaussian curvature

Online: 24 May 2022 (09:06:46 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202108.0087.v6

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; Inca; Cusco; Ollantaytambo; Machu Picchu; Sacsayhuaman; Peru

Online: 16 May 2022 (12:15:55 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202205.0203.v1

An Intelligent Artificial Approach Used for Water Solar Distillation in the Algerian Sahara Area

Omar Labbadlia, Mounir Zirari, Younes Chiba, Yacine Marif

Subject: Engineering, Mechanical Engineering Keywords: solar distillation; intelligent artificial approach; thermal analysis; water treatment

Online: 16 May 2022 (10:06:28 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202205.0155.v1

Rolling Bearing Fault Diagnosis based on Multiscale Permutation Entropy and SOA-SVM

Xi Zhang, Hongju Wang, Mingming Ren, Mengyun He, Lei Jin

Subject: Engineering, Mechanical Engineering Keywords: whale optimization algorithm; variational mode decomposition; seagull optimization algorithm; support vector machine; multi-scale permutation entropy; fault diagnosis

Online: 12 May 2022 (03:49:42 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202204.0273.v1

Research on The Controllable Interface Response Enhancement of The Textured Pilot Valve

Jing Xu, Guiming Zhang, Shaochao Fan, Jing Ni, Jiadi Lian

Subject: Engineering, Mechanical Engineering Keywords: pilot valve; texture; response; stress; flow field analysis

Online: 28 April 2022 (05:28:55 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202204.0210.v1

Idle Vibration Reduction of a Diesel Sport Utility Vehicle

Seokwon Ryu, Dongju Kim, Booyoung Lee, Doohee Han, Insoo Jung, Jintai Chung

Subject: Engineering, Mechanical Engineering Keywords: diesel sport utility vehicle (SUV); idle vibration; multi-body dynamic model; vibration reduction; vibration absorber

Online: 22 April 2022 (07:52:21 CEST)

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Preprint REVIEW | doi:10.20944/preprints202204.0067.v1

Multi-Scale Modelling of Fuel Droplet Heating and Evaporation in Combustion Engines

Jianfei Xie

Subject: Engineering, Mechanical Engineering Keywords: fuel droplet; liquid-vapour interface; molecular dynamics; evaporation coefficient; Knudsen layer; kinetic theory modelling

Online: 8 April 2022 (03:17:40 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202203.0392.v1

Simulation-Based Process Design for the Asymmetric Single Point Incremental Forming of Individual Hip Cup Prosthesis Made of Titanium Alloy

Sirine Frikha, Laurence Giraud Moreau, Anas Bouguecha, Mohamed Haddar

Subject: Engineering, Mechanical Engineering Keywords: Incremental Forming; Finite Element simulation; biomedical implants; titanium; wall angle

Online: 30 March 2022 (15:15:24 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202203.0386.v1

Calculation of the Pressure Field for Turbulent Flow Around a Surface Mounted Cube Using the SIMPLE Algorithm and PIV Data

Nikolaos-Petros Pallas, Demetri Bouris

Subject: Engineering, Mechanical Engineering Keywords: CFD; PIV; experimental fluid mechanics; pressure calculation; SIMPLE; Reynolds Stresses; measurement integration)

Online: 30 March 2022 (04:40:11 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202203.0382.v1

The Characteristic of CFRP Laminates Related to Water Absorption Subjected to Tensile, Bending, and Compression

Sudarisman Sudarisman, Alfian Hidayat, Haniel Haniel, Muhammad Tiopan, Rela Adi Himarosa, Muhammad Akhsin Muflikhun

Subject: Engineering, Mechanical Engineering Keywords: CFRP; vacuum infusion; water absorption; tensile test; bending test; compressive test

Online: 29 March 2022 (12:22:53 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202203.0355.v1

Scaled-Up Multi-Needle Electrospinning Process Using Parallel Plate Auxiliary Electrodes

Étienne J. Beaudoin, Maurício M. Kubaski, Mazen Samara, Ricardo J. Zednik, Nicole R. Demarquette

Subject: Engineering, Mechanical Engineering Keywords: electrospinning; multi-needle electrospinning; scale-up; auxiliary electrodes; nanofibers; non-woven membranes; PVDF

Online: 28 March 2022 (07:52:48 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202203.0308.v1

Laser Structuring and DLC Coating of Elastomers for High Performance Applications

Sönke Vogel, Andreas Brenner, Bernadette Schlüter, Bernhard Blug, Franziska Kirsch, Tamara van Roo

Subject: Engineering, Mechanical Engineering Keywords: diamond like carbon; DLC; Tribology; rubber; flexible; nature inspired; coating; friction; sealing; delamination

Online: 23 March 2022 (04:32:51 CET)

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Preprint ARTICLE | doi:10.20944/preprints202203.0287.v1

Experimental Combustion and Emissions Evaluation of Ternary Mixtures of Diesel-Biodiesel-Ethanol in a CFR-ASTM Engine

Rodrigo R. Machado, Nauberto R. Pinto, Marcelo J. Colaço, Albino J. K. Leiroz

Subject: Engineering, Mechanical Engineering Keywords: ternary mixtures; CFT-ASTM; Bayesian techniques

Online: 21 March 2022 (18:34:12 CET)

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Preprint ARTICLE | doi:10.20944/preprints202203.0222.v1

Ensemble Machine Learning Approach for Evaluating the Material Characterization of Carbon Nanotube-Reinforced Cementitious Composites

Faramarz Bagherzadeh, Torkan Shafighfard

Subject: Engineering, Mechanical Engineering Keywords: machine learning; CNT-reinforced cement-based composites; mechanical attributes

Online: 15 March 2022 (16:50:44 CET)

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Preprint ARTICLE | doi:10.20944/preprints202108.0087.v5

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; replica; chisel; hammer; megalith; Inca; Cusco; Ollantaytambo; Machu Picchu; Sacsayhuaman; Peru

Online: 8 March 2022 (10:58:47 CET)

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Preprint ARTICLE | doi:10.20944/preprints202203.0098.v1

Dynamic Model and Response Analysis of Gear-Rotor-Bearing Systems with Bearing Fitting Clearances

Fengtao Wang, Peng Dai, Jianping Wang, Linkai Niu

Subject: Engineering, Mechanical Engineering Keywords: Gear-rotor-bearing system; bearing fitting clearance; vibration response; rotating speed; multiple harmonic response

Online: 7 March 2022 (12:31:56 CET)

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Preprint ARTICLE | doi:10.20944/preprints202203.0080.v1

Residual Stresses in VT6 (Ti-6Al-4V) Alloy After Shot Peening Evaluated Using X-Ray Diffraction, Laser Speckle Interferometry and GA-Ion FIB-DIC Micro-Ring-Core Milling

Pavel A. Somov, Eugene S. Statnik, Yuliya Kan, Vladimir S. Pisarev, Sviatoslav I. Eleonsky, Dmitry Yu. Ozherelkov, Alexei I. Salimon

Subject: Engineering, Mechanical Engineering Keywords: residual stress; VT6 (Ti-6Al-4V); shot peening; X-ray diffraction; speckle interferometry; Ga-ion FIB-DIC

Online: 4 March 2022 (13:34:03 CET)

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Shot peening has become a well-established technique for the introduction of beneficial compressive Residual Stresses (RS) into the near-surface layers of metallic materials for the purpose of preventing or suppressing fatigue crack nucleation and growth. Ti-alloys are widely used to fabricate compressor blades of aeroengines. Titanium blades that may be susceptible to different modes of damage under cyclic loading (high cycle fatigue, fretting fatigue) are often subjected to shot peening to extend their safe operating time. The control and monitoring of residual stresses in titanium blades is of great importance to assure the safety of aeroengines. The techniques for residual stress evaluation include mechanical methods (material removal) as well as physical methods such as X-ray diffraction. Perhaps the most common and practically accessible form of the latter is the method. Conventional laboratory X-ray diffractometers typically probe samples to the depths up to ~20 µm that correspond to 1x...5x the average grain size for typical metals and alloys. The limitations of the method have been identified and reviewed in the literature, motivating the use of other semi-destructive approaches to evaluate the residual stresses in deeper layers and at more sharply defined locations. In the present report we present a case study of the comparison between non-destructive and semi-destructive evaluation techniques, namely the X-ray diffraction method against the mechanical and FIB-DIC ring-core drilling applied to the samples of VT6 (Russian designation of Ti-6Al-4V) titanium alloy after shot peening with 1 mm steel balls. Mechanical drilling of circular holes of ~2 mm diameter with laser speckle interferometry monitoring of strains gives a rough spatial resolution of a few millimeters, while the Korsunsky FIB-DIC method of Ga-ion beam micro-ring core milling within FIB-SEM with Digital Image Correlation (DIC) deformation analysis delivers spatial resolution down to a few micrometers. Good agreement has been found between the X-ray and FIB-DIC estimates of RS variation profiles as a function of depth in shot peened titanium alloy samples. Some advances in the FIB-DIC method are presented and discussed in terms of the acceleration of data acquisition and interpretation.

Preprint ARTICLE | doi:10.20944/preprints202203.0056.v1

Aerodynamic Performance and Wake Flow of Crosswind Kite Power Systems

Mojtaba Kheiri, Samson Victor, Sina Rangriz, Mher Marc Karakouzian, Frederic Bourgault

Subject: Engineering, Mechanical Engineering Keywords: Airborne wind energy; crosswind kite; induction factor; wake model; aerodynamic performance; CFD; analytical model

Online: 3 March 2022 (07:50:24 CET)

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Preprint ARTICLE | doi:10.20944/preprints202203.0023.v1

Contributions on Highlighting an Energy Method Used for Constructive Optimization of the Mechanical Structure of a Mobile Robot Implemented in Humanitarian Demining Operations

Silviu Mihai Petrişor, Mihaela Simion

Subject: Engineering, Mechanical Engineering Keywords: robotics; tracked robot; dynamic modeling; constructive optimization; human-artificial partnership; humanitarian demining

Online: 1 March 2022 (12:56:18 CET)

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Modularity in the construction of industrial robots is becoming increasingly popular, as the modules can be assembled in different ways so as to obtain various architectures of industrial robots determined by the requirements of specific applications. Such a robot with modular structure is considered in this paper. The tracked mobile robot, with translation – rotation – translation – translation – rotation (TRTTR) modular serial structure, is the subject of national invention patent number RO132301 B1/2021, granted by the State Office for Inventions and Trademarks of Bucharest, to “Nicolae Bălcescu” Land Forces Academy of Sibiu, Romania [1]. The tracked mobile robot has been designed to perform the task of humanitarian demining operations and the mechanical structure, respectively the kinematic analysis were described in detail in papers [1,2]. A first general objective of this paper is to highlight a dynamic-organological method to achieve an architectural structure of mobile robot on tracks, able to replace the human element in areas with high risk for health and life, for detection and demining anti-personnel and anti-armor minefields in countries where military conflicts have taken place. For this scope it was performed the dynamic modeling using the Lagrange’s formalism and to achieve the constructive optimization of the TRTTR mechanical structure, in order to obtain a minimum energy consumption through an optimal arrangement of the modules in its structure. A second objective is to improve the action flexibility of the technological product in humanitarian detection and demining operations, as well as for educational purposes, by training highly educated and specialized human resources in the field of advanced military technologies. The differential equations of motion of the robot has obtained and respectively the mechanical design equations, which lead to the optimal choice of the drive motors of the modules in the robot structure. Also, it is presented the mathematical model for obtaining the driving motor of base translation modulus (MTB SIL) of the modular serial tracked robot and the constructive solution of the MTB SIL module.

Preprint ARTICLE | doi:10.20944/preprints202202.0360.v1

Effect of Kinematic Algorithm Selection on the Conceptual De-Sign of Orbitally Delivered Vehicles

David Cole, Timothy Sands

Subject: Engineering, Mechanical Engineering Keywords: GNC system design; design and analysis of orbit/attitude determination and control systems; motion planning; guidance; control; trajectory planning; conceptual design; kinematics; direction cosine matrix; DCM; 6 Degrees of Freedom; 6 DOF

Online: 28 February 2022 (12:22:36 CET)

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A particular challenge in the conceptual design of direct-from orbit delivery systems is the seemingly well-known kinematics retain fallacies whose efficacies are reduced over great distances. Rotation about the local wing of an aerospace vehicle is almost never the pitch angle, yet modern application of kinematics often assumes such (with accompanying angular error). The same assertion is usually true about the nature of roll and yaw angles. Expressing motion in coordinates of rotating reference frames necessitates transformation between reference frames, and one such transformation is embodied in the Direction Cosine Matrices (DCM) formed by a sequence of three successive frame rotations. One of two ubiquitous sequences of three rotations used to construct the DCM involves first a rotation around the inertial z-axis, then intermediate y-axis, then finally about the body’s x-axis; a sequence commonly called the “aerospace sequence” or the a “3-2-1 rotation sequence”. The second ubiquitous sequence is the so-called “orbital sequence” or “3-1-3 rotation sequence” with rotations about the inertial z axis first, then about the intermediate x-axis, then finally about the body z-axis. This manuscript evaluates which sequence is the most advantageous for an object starting in space and then travels through the atmosphere to a target on the Earth’s surface. Six degrees of freedom of vehicle motion were simulated starting in orbit with a given thrust and commanded maneuver. The simulation performs all twelve possible rotation sequences (transforming inertial coordinates to body coordinates) with comparison by computational burden and error representing rotations about body axes (roll, pitch, and yaw respectively). Simulation precision is validated using the quaternion normalization condition indicating near machine precision (0.9\times{10}^{-15}) and reveals the so-called 132 rotation is the most accurate with an average error of 0.14° and a computational time of 0.013 seconds: resulting in a 97.95% increase in accuracy over the so-called 321 rotation and a 99.84% increase over the so-called 313 rotation.

Preprint ARTICLE | doi:10.20944/preprints202202.0348.v1

Novel State-Space Realization Generalized from Turbine Blade Modeling

Andrew van Paridon, Timothy Sands

Subject: Engineering, Mechanical Engineering Keywords: transfer function; state-space; realization; conversion

Online: 28 February 2022 (07:23:56 CET)

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Preprint ARTICLE | doi:10.20944/preprints202202.0339.v1

An Analytical Exploration and Mathematical Modeling on the Dynamics of Sea Wave Energy Conversion to Electricity Production

Ahmed Sayed Hassan, Mohammed Tharwan, Yahya Rothan

Subject: Engineering, Mechanical Engineering Keywords: Wave; Energy; Dynamics; Modeling; Generator; Converter; linear

Online: 25 February 2022 (13:53:54 CET)

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Recently, most countries suffering from global warming due to the waste gases coming out of the combustion engines used to generate electric power by traditional methods. Therefore, many countries are currently trying to find alternative solutions to this problem by using renewable energies such as solar energy, wind energy, and energy generated from the waves of the ocean and sea to overcome pollution problems. The waves of the seas and oceans have enormous and largely untapped energy, so this work presents an efficient way to use the energy of sea waves to generate electricity. And also, trying to be a way to produce electricity from wave energy in the future. The best suitable places along the shores of Jizan city were inspected to install the buoy system to revenue advantage of the wave supreme height to achieve the height amount of electrical energy. A mathematical model was made to analyze the wave energy and convert it into energy extracted by mechanical force. The mathematical analyzes used the data collected from satellite maps of the numerous severe waves in the Red sea of the Jazan area, and the data published in previous research along that area. It was found that the beach of the Al Shuqaiq area is the greatest for installing the buoy and obtaining the highest electrical energy due to the presence of the highest wave intensity, followed by the beach of the Baysh and Al Morgan area. Also, one of the objectives of this research is to study the design of a device powered by a buoy to use the waves of the Red Sea to generate electric power. The influence of the buoy system design parameters such as the buoy diameter, length of the cylinder, and the length of the connecting rod on the electrical energy generation from wave energy was investigated. The current device is designed with a gearbox to produce continuous power with a single electric generator. A floating mooring device uses the rise and fall of bulges to convert sea wave energy into electrical energy. The device consists of a float, arm, two wheels of different diameters, a gear set, and an electric generator. The effect of the design of several factors on the performance of the device for converting the sea waves energy into electrical energy, including the length of the buoy arm, the wave height by changing the cam diameter, and the conversion ratios between the gear set, to optimize the output power of the wave energy.

Preprint ARTICLE | doi:10.20944/preprints202202.0256.v1

Influence of the Volute Design Parameters on the Flow Phenomena and Performance of the Centrifugal Compressor

ahmed sayed hassan, Haitham Hadidi,, Mohammed Tharwan

Subject: Engineering, Mechanical Engineering Keywords: Casing treatment; Surge margin; Rotating stall; surface roughness; flow instability

Online: 21 February 2022 (14:52:08 CET)

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Influence of the volute design parameters on the stable operating range and the performance of a centrifugal compressor was investigated experimentally for the following design conditions. The volute casing surface roughness was changed from 0 to 200 µm in five steps and tested. The axial distance between the casing and the diffuser cascades (clearance) was varied in five steps as C/b₂ = 1.2, 2.4%, 3.6%, 4.8%, and 6% relative to the impeller exit width. The radial distance from the impeller blade exit to the diffuser vane inlet in (vaneless space radius) in six steps as C/r₂ = 1.03, 1.05, 1.07, 1.09, 1.11, and 1. 13 relatives to the rotor outlet radius. The volute outlet geometry of a symmetric and tangent with different area ratios from 0.4 to 0.9. Finally, the compressor has been tested experimentally with different pinched vaned diffuser distances relative to the impeller exit width of bp/b2 =1, 0.98, 0.96, 0.94, 0.92, and 0.9. These testes were carried at different compressor operating conditions, and the time variations of the static pressure were recorded using five high-frequency response pressure transducers. A hot-wire anemometer is used to measure the compressor flow rate. The rotating stall and surge at the vaneless zone after the impeller exit can be detected by analyzing the fluctuations of pressure signals and the power spectrum density by using the Fast Fourier Transformation analysis. The experimental results indicated that the compressor with volute casing surface roughness of 100mm gives about 10.9% enhancements in the stable operating and 1% in pressure rise coefficient. The best axial distance between the diffuser vanes and the casing is 2.4% of the impeller blade height and the compressor in this design gives about 12.4% improvements in the stable working range. The compressor with radial vaneless distance of 1.056 gives improvements of about 16.6% in the surge margin, 2% in the pressure recovery and 4% in pressure rise coefficients. The compressor with a pinched diffuser of b/bp of 0.98 gives an improvement of 20.8% in surge point.

Preprint ARTICLE | doi:10.20944/preprints202202.0252.v1

Cyclic Oxidation Properties of the Near Nanocrystalline AlCrFeCoNi High-Entropy Alloy Coatings Applied by Atmospheric Plasma Spraying Technique

Farzin Ghadami, Mohammad Amin Davoudabadi, Soheil Ghadami

Subject: Engineering, Mechanical Engineering Keywords: AlCrFeCoNi high-entropy alloy coating; APS deposition; Cyclic oxidation

Online: 21 February 2022 (12:01:36 CET)

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Preprint ARTICLE | doi:10.20944/preprints202202.0179.v2

Research on 4-UPUS Parallel Mechanism Ankle Joint Rehabilitation Training Robot

Ao Hu, Qiang Yin, Chengcai He, Xiaohong Dun, Jia Ai

Subject: Engineering, Mechanical Engineering Keywords: Ankle joint rehabilitation robot; Parallel mechanism; Statics analysis; Kinematics analysis; Workspace

Online: 18 February 2022 (13:06:23 CET)

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Preprint ARTICLE | doi:10.20944/preprints202202.0179.v1

Research on 4-UPUS Parallel Mechanism Ankle Joint Rehabilitation Training Robot

Ao Hu, Qiang Yin, Chengcai He, Xiaohong Dun, Jia Ai

Subject: Engineering, Mechanical Engineering Keywords: Ankle joint rehabilitation robot; Parallel mechanism; Statics analysis; Kinematics analysis; Workspace

Online: 14 February 2022 (15:56:27 CET)

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Preprint ARTICLE | doi:10.20944/preprints202202.0147.v1

Fatigue Crack Initiation and Propagation Relation at Notched Specimens with Welded Joints Characteristics

Moritz Braun, Claas Fischer, Jörg Baumgartner, Matthias Hecht, Igor Varfolomeev

Subject: Engineering, Mechanical Engineering Keywords: notch fatigue analysis; finite element analysis; fracture mechanics; stress gradient; notch acuity; S-N curves; statistical methods; artificial notches

Online: 10 February 2022 (10:44:15 CET)

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Preprint ARTICLE | doi:10.20944/preprints202202.0121.v1

Verification and Validation in Computational Mechanics

Shuvodeep De

Subject: Engineering, Mechanical Engineering Keywords: computational mechanics; composite materials; FEA

Online: 8 February 2022 (15:40:53 CET)

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Preprint ARTICLE | doi:10.20944/preprints202202.0112.v1

Auxetic Structures from Rotating Squares

Julian Plewa, Małgorzata Płońska, Paweł Lis

Subject: Engineering, Mechanical Engineering Keywords: auxetic structures; metamaterials; negative Poisson’s ratio (NPR)

Online: 8 February 2022 (13:15:25 CET)

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Preprint CONCEPT PAPER | doi:10.20944/preprints202202.0094.v1

Reduced Numerical Modeling of Turbulent Flow with Fully Resolved Time Advancement. Part 1. Theory and Physical Interpretation

Alan R Kerstein

Subject: Engineering, Mechanical Engineering Keywords: turbulence; numerical simulation; multiscale modeling; stochastic processes

Online: 7 February 2022 (15:45:47 CET)

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Preprint ARTICLE | doi:10.20944/preprints202108.0087.v4

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; replica; chisel; hammer; megalith; Inca; Cusco; Ollantaytambo; Machu Picchu; Peru

Online: 4 February 2022 (10:33:08 CET)

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Preprint ARTICLE | doi:10.20944/preprints202202.0063.v1

Wear Analysis of Additively Manufactured Slipper-Retainer in the Axial Piston Pump

Agnieszka Klimek, Janusz Kluczyński, Jakub Łuszczek, Adam Bartnicki, Krzysztof Grzelak, Marcin Małek

Subject: Engineering, Mechanical Engineering Keywords: additive manufacturing; wear analysis; mechanical properties; H13 tool steel

Online: 3 February 2022 (16:18:57 CET)

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Preprint ARTICLE | doi:10.20944/preprints202201.0413.v1

Characterization Of Deburring By Abrasive Flow Machining for AL6061

Kwang Joon Kim, Young-Gwan Kim, Kwon-Hee Kim

Subject: Engineering, Mechanical Engineering Keywords: Burr; deburring; abrasive flow machining; objective function; intersecting holes with offset; ANSYS Fluent; prediction of deburring performance

Online: 27 January 2022 (11:09:30 CET)

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Preprint ARTICLE | doi:10.20944/preprints202201.0412.v1

A Variable-length Rational Finite Element Based On The Absolute Nodal Coordinate Formulation

Zhishen Ding, Bin Ouyang

Subject: Engineering, Mechanical Engineering Keywords: Arbitrary Lagrange-Euler; Rational finite element; Absolute nodal coordinate formulation; Variable-length finite element; Sliding joint

Online: 27 January 2022 (11:05:54 CET)

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Preprint ARTICLE | doi:10.20944/preprints202201.0409.v1

Nonlinear Investigation of Gol'denveizer's Problem of a Circular and Elliptic Elastic Torus

Guangkai Song, Bohua Sun

Subject: Engineering, Mechanical Engineering Keywords: circular torus; elliptic torus; finite element method; buckling; nonlinear analysis; Gaussian curvature

Online: 27 January 2022 (06:58:12 CET)

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Preprint ARTICLE | doi:10.20944/preprints202201.0363.v1

Can a Priori Unknown Values of Biomechanical Parameters Be Determined with Sufficient Accuracy in Mbs Using Sensitivity Analysis? Analyzing the Interaction Characteristics between Cervical Vertebra and Pedicle Screw

Ivanna Kramer, Sabine Bauer

Subject: Engineering, Mechanical Engineering Keywords: multibody simulation; multi-way sensitivity analysis; spinal implant anchor screw; stiffness and damping parameters

Online: 24 January 2022 (14:56:06 CET)

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Preprint ARTICLE | doi:10.20944/preprints202201.0362.v1

Hydrocode Investigations of Terminal Astroballistics Problems During the Hypothetical Future Planetary Defense System’s Space Mission

Maciej Mroczkowski, Stanisław Kachel, Adam Kozakiewicz

Subject: Engineering, Mechanical Engineering Keywords: astronautics; astrodynamics; terminal astroballistics; the main planetary defense problem; hydrocode; warheads; impulsive dynamic interactions on the asteroids; modeling and simulation; sensors; network-centric system architecture; space missions; navigation; planetary defense modeling; synchronization; atomic and pulsar time; autonomy; space; relativistic metrology

Online: 24 January 2022 (14:44:37 CET)

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The article is devoted to the preliminary concept of the Future Planetary Defense System (FPDS), emphasizing Astroballistics. This paper is intended to support international efforts to improve the planetary security of the Earth. The work covers three areas of knowledge: Astronautics, Astrodynamics, and Astroballistics. The most important part of the presented article is dynamic, contact combat modeling against small, deformable celestial bodies. For these purposes, the original, proprietary hydrocode of the Free Particle Method (HEFPM-G) with gravity was used. The main aim of combat is to redirect the Potentially Hazardous Objects (PHOs) to orbits safe for the Earth or destroy them. This concept's first task is to find, prepare and use dynamic three-dimensional models of celestial bodies' motion and spacecraft or human-crewed spaceships in the Solar System's relativistic frame. The second task is to prepare the FPDS' architecture and computer simulation space missions' initial concepts in the internal part of the solar system. The third and main task covers simulating, using hydrocodes, selected methods of fighting 100 m and 140 m diameter asteroids. The order of the article is as follows. The first part of the article presents an architecture and FPDS' modus operandi. Preliminary design and development of FPDS' space missions, including navigation, mission dynamics simulation, is prepared using an open-source space mission analysis and design tool. E.g., Asterank and Trajectory Browser or GMAT are presented in the second part. The third part of the article is devoted to computer hydrocodes (HEFPM-G) and the modeling and simulation of asteroid–asteroid collision, laser radiation effects on an asteroid, and FPDS spacecraft's warhead contact interaction on the small celestial body. The authors formulated the Main Planetary Defense Problem (MPDP) in this paper. The proposition of this problem solving has been realized by preparing its concepts, architecture, and modus operandi of the FPDS mission. Finally, a series of realistic simulations were made using hydrocode to deflect or destroy dangerous asteroids. The summary and conclusions can be found in the fourth part of the article.

Preprint ARTICLE | doi:10.20944/preprints202104.0762.v3

Uncertainty Quantification And Sensitivity Analysis Of Parameterization-free Surrogate Model

Jiajun Cao, Qingbiao Li, Liping Xu, Rui Yang, Yuejin Dai

Subject: Engineering, Mechanical Engineering Keywords: uncertainty quantification; sensitivity analysis; surrogate model method; optimisation; graph neural network; parameterisation

Online: 24 January 2022 (10:39:52 CET)

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Preprint ARTICLE | doi:10.20944/preprints202201.0305.v1

Organic Brake Friction Composite Materials: Impact of Mixing Duration on Microstructure, Properties, Tribological Behavior and Wear Resistance

Fatma Makni, Anne-Lise Cristol, Riadh Elleuch, Yannick Desplanques

Subject: Engineering, Mechanical Engineering Keywords: Brake friction materials; mixing duration; properties; tribological behavior; wear

Online: 20 January 2022 (13:33:13 CET)

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Preprint REVIEW | doi:10.20944/preprints202201.0272.v1

A Review of Thermally Activated Building Systems (TABS) for Improving the Thermal Behavior of Buildings

M.M. Villar-Ramos, I. Hernández-Pérez, K.M. Aguilar-Castro, I. Zavala-Guillén, E.V. Macias-Melo, I. Hernández-López, J. Serrano-Arellano

Subject: Engineering, Mechanical Engineering Keywords: Thermally Activated Building System; thermal comfort; thermal mass

Online: 19 January 2022 (14:18:14 CET)

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Preprint COMMUNICATION | doi:10.20944/preprints202201.0252.v1

Experimental Bending Fatigue Data of Additive-Manufactured PLA Biomaterial Fabricated by Different 3d Printing Parameters

Ali Dadashi, Mohammad Azadi

Subject: Engineering, Mechanical Engineering Keywords: Fatigue data; Polylactic acid; Additive manufacturing, 3D printing, Fused deposition modeling

Online: 18 January 2022 (10:44:17 CET)

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Preprint ARTICLE | doi:10.20944/preprints202201.0215.v1

Wafer Bifurcation as a Spontaneous Symmetry Breaking

Vincenzo Vinciguerra, Antonio Landi, Giuseppe Malgioglio

Subject: Engineering, Mechanical Engineering Keywords: Bifurcation; Wafer; Spontaneous Symmetry Breaking; Finite Element Analysis (FEA); Simulations

Online: 14 January 2022 (14:31:12 CET)

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Preprint ARTICLE | doi:10.20944/preprints202201.0197.v1

Elastodynamic Behaviour of Laminate Structures with Soft Thin Interlayers: Theory and Experiment

Maria V. Wilde, Mikhail V. Golub, Artem A. Eremin

Subject: Engineering, Mechanical Engineering Keywords: laminate; soft material; thin interlayer; guided waves; edge waves; effective boundary conditions

Online: 13 January 2022 (18:45:28 CET)

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Preprint ARTICLE | doi:10.20944/preprints202201.0128.v1

Estimation of Extreme Loads of the Mi-24 Helicopter During Maneuvers Using Simulation Method

Grzegorz Kowaleczko, Lukasz Piatkowski

Subject: Engineering, Mechanical Engineering Keywords: helicopter loads; fatigue and strength tests; pullup/pushover and diving maneuvers

Online: 10 January 2022 (15:43:44 CET)

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Preprint ARTICLE | doi:10.20944/preprints202201.0111.v1

Beam Damage Assessment Using Natural Frequency Shift and Machine Learning

Nicoleta Gillich, Cristian Tufisi, Christian Sacarea, Catalin V Rusu, Gilbert-Rainer Gillich, Zeno-Iosif Praisach, Mario Ardeljan

Subject: Engineering, Mechanical Engineering Keywords: damage detection; linear regression; random forest; artificial neural network; training parameters; natural frequency

Online: 10 January 2022 (12:26:27 CET)

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Preprint ARTICLE | doi:10.20944/preprints202201.0100.v1

Audoly-Pomeau Linear Law of the Gol'denveizer Torus

Guangkai Song, Bohua Sun

Subject: Engineering, Mechanical Engineering Keywords: circular torus; finite element method; analytical solution; Gaussian curvature

Online: 10 January 2022 (11:27:25 CET)

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Preprint ARTICLE | doi:10.20944/preprints202201.0068.v1

Optimization of a Bearing Fault Diagnosis Method Based on Convolutional Neural Network and Wavelet Packet Transform by Simulated Annealing

Feng He, Qing Ye

Subject: Engineering, Mechanical Engineering Keywords: Simulated annealing; Wavelet packet transform; Convolutional neural network

Online: 6 January 2022 (10:27:40 CET)

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Preprint REVIEW | doi:10.20944/preprints202201.0050.v1

Flow Control in Wings and Discovery of Novel Approaches via Deep Reinforcement Learning

Ricardo Vinuesa, Oriol Lehmkuhl, Adrian Lozano-Duran, Jean Rabault

Subject: Engineering, Mechanical Engineering Keywords: turbulence; flow control; simulation; aerodynamics; machine learning; deep reinforcement learning

Online: 6 January 2022 (09:36:50 CET)

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Preprint ARTICLE | doi:10.20944/preprints202112.0397.v1

Axial Force Analysis of the Support Bracket of Pumped Storage Unit

Buchao Xu, Weiqiang Zhao, Wenhua Lin, Zhongyu Mao, Ran Tao, Zhengwei Wang

Subject: Engineering, Mechanical Engineering Keywords: pump-turbine; support bracket; runner axial force; stress; deformation

Online: 24 December 2021 (08:11:22 CET)

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Preprint ARTICLE | doi:10.20944/preprints202112.0318.v1

Methodology for Wheelchair Design Based on Simulation Analyses

Grzegorz Dobrzynski, Michal Abramowski

Subject: Engineering, Mechanical Engineering Keywords: Wheelchair; climbing stairs; dynamics of movement; sensors

Online: 21 December 2021 (08:59:36 CET)

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Preprint ARTICLE | doi:10.20944/preprints202112.0218.v1

Characterising Penetrometer Tip Contact during Concrete Condition Assessment

Richard Hall, Alex Stumpf, Avinash Baji, Robert Ross, Dean Barnett

Subject: Engineering, Mechanical Engineering Keywords: concrete; remote sensing; remaining life assessment; condition assessment

Online: 13 December 2021 (17:45:55 CET)

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Preprint ARTICLE | doi:10.20944/preprints202112.0107.v1

Status and Perspectives of Commercial Aircraft Morphing

Michelangelo Giuliani, Ignazio Dimino, Salvatore Ameduri, Rosario Pecora, Antonio Concilio

Subject: Engineering, Mechanical Engineering Keywords: Morphing Wings; Adaptive Structures; Control Systems; Embedded Kinematics; Distributed Actuator and Sensor Networks

Online: 7 December 2021 (14:39:02 CET)

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Preprint ARTICLE | doi:10.20944/preprints202112.0062.v1

Cutting Force When Machining Hardened Steels

Karel Osička, Josef Chladil, Petra Sliwková, Jan Zouhar

Subject: Engineering, Mechanical Engineering Keywords: hardened steel; cubic boron nitride; rolling body; structural equations

Online: 6 December 2021 (11:55:19 CET)

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Preprint ARTICLE | doi:10.20944/preprints202111.0561.v1

Combining h-adaptivity with the Element Splitting Method for Crack Simulation in Large Structures

Shi Song, Moritz Braun, Hauke Herrnring, Bjarne Wiegard, Sören Ehlers

Subject: Engineering, Mechanical Engineering Keywords: finite element method; mesh strategy; linear elastic fracture mechanics; mesh refinement; fracture mechanics; numerical crack; h-AES method; interelement method; edge separation; crack propagation

Online: 30 November 2021 (11:43:56 CET)

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Preprint ARTICLE | doi:10.20944/preprints202108.0087.v3

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; replica; chisel; hammer; megalith; Inca; Cusco; Ollantaytambo; Machu Picchu; Peru

Online: 24 November 2021 (12:41:27 CET)

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Preprint ARTICLE | doi:10.20944/preprints202111.0415.v1

Improvement of Position Repeatability of a Linear Stage with Yaw Minimization

Doo Hyun Cho, Hyo Chan Kwon, Kwon Hee Kim

Subject: Engineering, Mechanical Engineering Keywords: Precision stage; Balanced platform; Balancing weight; Drive force offset; Yaw motion; Abbe er-ror; Error prediction; Low-cost stage; Open frame stage; Linear motion guide (LM Guide); Py-thon; GEKKO; ANSYS bushing joint

Online: 23 November 2021 (09:47:56 CET)

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Preprint ARTICLE | doi:10.20944/preprints202111.0377.v1

Rolling Element Bearing Fault Time Series Prediction Using Optimized MCKD-LSTM Model

Leilei Ma, Hong Jiang, Tongwei Ma, Xiangfeng Zhang, Lei Xia, Huailing Zeng, Yifeng Jiang, Yong Shen

Subject: Engineering, Mechanical Engineering Keywords: deep learning; time series prediction; long short-term memory; recurrent neural network; maximum correlation kurtosis deconvolution; cuckoo search.

Online: 22 November 2021 (10:55:00 CET)

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Preprint ARTICLE | doi:10.20944/preprints202111.0281.v1

Analytical Assessment and Comparison of Wood Strength and Density Effect in the Design of Three Connection Types in Double-Shear

Elza M. M. Fonseca, Pedro A. S. Leite, Lino D. S. Silva, Vânia S. B. Silva, Hernâni M. Lopes

Subject: Engineering, Mechanical Engineering Keywords: load-carrying capacity; wood connection; dowel

Online: 16 November 2021 (09:09:16 CET)

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Preprint ARTICLE | doi:10.20944/preprints202111.0274.v1

Rayleigh–Bénard Instability of an Ellis Fluid Saturated Porous Channel with an Isoflux Boundary

Pedro Vayssière Brandão, Michele Celli, Antonio Barletta

Subject: Engineering, Mechanical Engineering Keywords: Ellis fluid; Porous medium; Normal modes; Rayleigh–Bénard instability; Convection.

Online: 15 November 2021 (19:39:24 CET)

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Preprint REVIEW | doi:10.20944/preprints202105.0496.v2

An Explanation and Understanding of Aerodynamic Lift by Triple Deck Theory

Alois Schaffarczyk

Subject: Engineering, Mechanical Engineering Keywords: Aerodynamic Lift; Boundary Layer Theory; Triple Deck Theory

Online: 9 November 2021 (14:52:31 CET)

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Preprint ARTICLE | doi:10.20944/preprints202111.0060.v1

An Investigation of Surface Stress on the Fracture Mechanics Behavior of Classical and Phase-Separating Planar Electrodes

Seyed Ali Mahmoudy, Hamed Haftbaradaran

Subject: Engineering, Mechanical Engineering Keywords: Lithium-ion batteries; phase-separation; fracture mechanics; surface stress; diffusion-induced stresses

Online: 3 November 2021 (08:07:05 CET)

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Preprint ARTICLE | doi:10.20944/preprints202110.0255.v1

Exact Solutions for a Novel H₂ Optimal Design of Electromagnetic Tuned Mass Damper

Ge Li, Qibo Mao, Yifan Luo, Yong Wang, Lei Liu

Subject: Engineering, Mechanical Engineering Keywords: electromagnetic tuned mass damper; H2 optimization; structural vibration control; negative inductance; negative resistance.

Online: 18 October 2021 (15:37:50 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202108.0087.v2

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; replica; chisel; hammer; megalith; Inca; Cusco; Ollantaytambo; Machu Picchu; Peru

Online: 14 October 2021 (15:03:47 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202110.0192.v1

A Novel Framework for Predictive Modeling and Optimization of Powder Bed Fusion Process

Mallikharjun Marrey, Ehsan Malekipour, Hazim El-Mounayri, Eric Faierson, Mangilal Agarwal

Subject: Engineering, Mechanical Engineering Keywords: Additive manufacturing; powder bed fusion; optimization framework; predictive models; neural network; intelligent parameters selection; energy density optimization; mechanical properties optimization

Online: 13 October 2021 (10:20:29 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202109.0483.v1

Design and Analysis of a Helium-Assisted Hybrid Drone for Flight Time Enhancement

Geronimo Macias, Kooktae Lee

Subject: Engineering, Mechanical Engineering Keywords: Hybrid Drone; Helium UAV; Drone Design; Flight Time Increase; UAV Stability and Performance Analysis

Online: 29 September 2021 (09:50:49 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202109.0381.v1

Understanding the Enhanced Protective Mechanism of CoCrNiAlY－YSZ－LaMgAl₁₁O₁₉ Double-Ceramic Coating With Aluminum Plating

Junfei Xu, Zhiguo Wang, Shuai Hu, Yongjun Feng, Suying Hu, Yongjun Chen, Zhiwen Xie

Subject: Engineering, Mechanical Engineering Keywords: double ceramic coating; arc aluminum plating; stress; protection mechanism; finite element sim-ulation

Online: 22 September 2021 (11:52:46 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202109.0312.v1

Parametric Model Order Reduction of Guided Ultrasonic Wave Propagation in Fiber Metal Laminates with Damage

Nanda Kishore Bellam Muralidhar, Natalie Rauter, Andrey Mikhaylenko, Rolf Lammering, Dirk A. Lorenz

Subject: Engineering, Mechanical Engineering Keywords: Fiber metal laminates; Guided ultrasonic wave; Structural health monitoring; Proper orthogonal decomposition; Model order reduction; Damage detection

Online: 17 September 2021 (12:24:40 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202109.0299.v1

Local Thermal Rates and Gradients in Laser Powder Bed Fusion Metal Additive Manufacturing Method: Computer Simulation

Hamed Hosseinzadeh

Subject: Engineering, Mechanical Engineering Keywords: Metal 3D printing; Additive manufacturing; Powder bed fusion; Thermal simulation; Thermal history

Online: 17 September 2021 (09:28:45 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202109.0280.v1

The Effect of Open Boundaries on the Buoyant Viscoelastic Flow in a Vertical Porous Layer

Stefano Lazzari, Michele Celli, Antonio Barletta

Subject: Engineering, Mechanical Engineering Keywords: Buoyant convection; Porous medium; Oldroyd–B viscoelastic fluid; Linear stability analysis; Open boundary

Online: 16 September 2021 (11:44:07 CEST)

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