Engineering › Mechanical Engineering

Mechanical Engineering and Vibrations Research

Works Count: 62828

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Description

This cluster of papers focuses on the modelling, analysis, and optimization of composite springs, particularly for vehicle suspension systems. It includes topics such as finite element analysis, fatigue life prediction, mechanical behavior, helical springs, cam design, leaf springs, and the application of genetic algorithms in optimal design.

Keywords

Composite Springs; Vehicle Suspension; Finite Element Analysis; Optimization; Fatigue Life Prediction; Mechanical Behavior; Helical Springs; Cam Design; Leaf Springs; Genetic Algorithms

Machine design: An integrated approach

1998-01-01

Robert L. Norton

Dynamik der Kraftfahrzeuge

1995-01-01

Manfred Mitschke

Mechanics of Deformable Bodies

1950-01-01

Arnold Johannes Wilhelm Sommerfeld

Design of machinery: an introduction to the synthesis and analysis of mechanisms and machines

1992-11-01

Robert L. Norton

Part I Kinematics of Mechanisms 1 Introduction 2 Kinematics Fundamentals 3 Graphical Linkage Synthesis 4 Position Analysis 5 Analytical Linkage Synthesis 6 Velocity Analysis 7 Acceleration Analysis 8 Cam Design … Part I Kinematics of Mechanisms 1 Introduction 2 Kinematics Fundamentals 3 Graphical Linkage Synthesis 4 Position Analysis 5 Analytical Linkage Synthesis 6 Velocity Analysis 7 Acceleration Analysis 8 Cam Design 9 Gear Trains Part II Dynamics of Machinery 10 Dynamics Fundamentals 11 Dynamic Force Analysis 12 Balancing 13 Engine Dynamics 14 Multicylinder Engines 15 Cam Dynamics 16 Cam-and Servo-Driven Mechanisms Appendix A Computer Programs Appendix B Material Properties Appendix C Geometric Properties Appendix D Spring Data Appendix E Coupler Curve Atlases Appendix F Answers to Selected Problems Appendix G Equations for Under-or Overbalanced Multicylinder Engines Index DVD Catalog

Crashworthy capability of composite material structures

1997-02-01

A.G. Mamalis , Mark Robinson , D.E. Manolakos +3 more

Advanced Mechanics of Materials

2001-05-01

Kurt H. Gerstle

Cam Design and Manufacturing Handbook

2004-03-01

Robert L. Norton

Written by a professional with extensive practical and teaching experience in Mechanical Engineering. Cam Design and Manufacturing Handbook brings together up-to-date cam design technology, correct design and manufacturing procedures, and … Written by a professional with extensive practical and teaching experience in Mechanical Engineering. Cam Design and Manufacturing Handbook brings together up-to-date cam design technology, correct design and manufacturing procedures, and recent cam research results in one volume that is indispensable to the design and manufacturing of cam-follower systems. Beginning at an introductory level and progressing to more advanced topics, this comprehensive handbook includes complete coverage of: Proper Cam Design Techniques, Single- and Multi-Dwell Cams, Classical Cam Functions, Polynomial Cams, Spline Functions for Cams, Pressure Angle & Radius of Curvature, Radial and Barrel Cams, Translating & Oscillating Followers, Roller & Flat-Faced Followers, Forward & Inverse Dynamic Analyses, Residual Vibrations, Polydyne & Splinedyne Cams, Cam Profile Definition, Cutter Compensation, Conjugate Cams, Cam Materials & Manufacturing Techniques, Stress Analysis of the Cam Follower Joint, Lubrication of the Cam Follower Joint, Measurement of Cam Follower Dynamics, Extensive Bibliography. What's more, this unique book is accompanied by a 90-day trial demonstration copy of the Professional Version of Dynacam for Windows V. 7.0. Written by the author and used worldwide, this program solves the equations described in the book and allows in its fully licensed version the design, dynamic modeling, analysis, and generation of follower center, cam surface, and cutter coordinate data for any cam. It also defines conjugate cams for any cam design.

Shear Force Development by Pneumatic Tyres in Steady State Conditions: A Review of Modelling Aspects

1991-01-01

Hans B. Pacejka , R. Sharp

SUMMARY Modelling of the generation of shear forces by pneumatic tyres under steady state conditions is reviewed. The review is placed in a practical context, through reference to the uses … SUMMARY Modelling of the generation of shear forces by pneumatic tyres under steady state conditions is reviewed. The review is placed in a practical context, through reference to the uses to which models may be put by the vehicle dynamicist and the tyre designer. It will be of interest also to the student of rolling contact problems. The subject is divided into sections, covering physically founded models which require computation for their solution, physically based models which are sufficiently simplified to allow analytical solutions and formula based, empirical models. The classes are more nearly continuous than this strict division would imply, since approximations in obtaining analytical solutions may be made, empirical correction factors may be applied to analytical results and formula based methods may take into account tyre mechanical principles. Such matters are discussed in the relevant sections. Attention is given to the important matter of choosing model parameters to best represent the behaviour of a particular tyre. Conclusions relate to the structural and frictional mechanisms present in the shear force generation process, the contributions of carcass and tread elastic properties and of geometrical and frictional factors to the determination of the distributions of force through the contact region, the relationship between accuracy and computational load and the selection of methods for modelling tyre forces in a road vehicle dynamics context. Reference to the most pertinent literature in the field is made and possibilities for the further development of the state of the art are mentioned.

Vehicle Dynamics: Theory and Application

2008-01-01

Reza N. Jazar

2002 ASME International Mechanical Engineering Congress and Exposition

2003-07-01

Sean F. Wu

First Page First Page

Nonlinear Integer and Discrete Programming in Mechanical Design Optimization

1990-06-01

Eric P. Sandgren

A general purpose algorithm for the solution of nonlinear mathematical programming problems containing integer, discrete, zero-one, and continuous design variables is described. The algorithm implements a branch and bound procedure … A general purpose algorithm for the solution of nonlinear mathematical programming problems containing integer, discrete, zero-one, and continuous design variables is described. The algorithm implements a branch and bound procedure in conjunction with either an exterior penalty function or a quadratic programming method. Variable bounds are handled independently from the design constraints which removes the necessity to reformulate the problem at each branching node. Examples are presented to demonstrate the utility of the algorithm for solving design problems.

Vibration and Shock in Damped Mechanical Systems

1969-06-01

J. C. Snowdon , D. I. G. Jones

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Aluminium in Innovative Light-Weight Car Design

2011-01-01

Jürgen Hirsch

The main Aluminium applications as state-of-the-art in European cars are presented. The main established Aluminium alloys and their application in automotive parts are presented together with recent developments. Also new … The main Aluminium applications as state-of-the-art in European cars are presented. The main established Aluminium alloys and their application in automotive parts are presented together with recent developments. Also new studies and innovative multi-material concepts are discussed where Aluminium light-weight solutions are compared with that of other materials, like new steels, magnesium, plastics and composites. In the "SLC" (Super-Light-Car) project these new concepts were tested in a multi-material body-in-white prototype for a VW Golf V car, reaching a 34% weight reduction within a cost increment of 7,8 €/kg saved, with suitable technologies for high volume assembly cycles. In the final SLC concept Aluminium is the material of choice, proving its leading role in innovative light-weighting of cars. Aluminium achieves weight savings of parts up to 50% while maintaining safety and performance in a cost efficient way, competing efficiently with other light-weight materials.

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Parametric Deflection Approximations for End-Loaded, Large-Deflection Beams in Compliant Mechanisms

1995-03-01

Larry L. Howell , Ashok Midha

Geometric nonlinearities often complicate the analysis of systems containing large-deflection members. The time and resources required to develop closed-form or numerical solutions have inspired the development of a simple method … Geometric nonlinearities often complicate the analysis of systems containing large-deflection members. The time and resources required to develop closed-form or numerical solutions have inspired the development of a simple method of approximating the deflection path of end-loaded, large-deflection cantilever beams. The path coordinates are parameterized in a single parameter called the pseudo-rigid-body angle. The approximations are accurate to within 0.5 percent of the closed-form elliptic integral solutions. A physical model is associated with the method, and may be used to simplify complex problems. The method proves to be particularly useful in the analysis and design of compliant mechanisms.

Planetary Gear Train Dynamics

1994-09-01

Ahmet Kahraman

A model to simulate the dynamic behavior of a single-stage planetary gear train with helical gears is developed. The three-dimensional dynamic model includes all six rigid body motions of the … A model to simulate the dynamic behavior of a single-stage planetary gear train with helical gears is developed. The three-dimensional dynamic model includes all six rigid body motions of the gears and the carrier. The generic nature of the formulation allows the analysis of a planetary gear set with any number of planets. Planets can be arbitrarily spaced (equally or unequally) around the sun gear. The model is also capable of handling different planet meshing conditions which are functions of number of gear teeth and planet positions. The linear time-invariant equations of motion are solved to obtain the natural modes and the forced vibration response due to static transmission errors. The proposed model is employed to describe the effects of the planet mesh phasing conditions on the dynamic behavior of a four-planet system.

A matrix structural theory of piecewise linear elastoplasticity with interacting yield planes

1970-12-01

G. Maier

Corrections to the paper "A matrix structural tbeo O, oJ piecewise linear elastoplasti¢i O' w#b interacting.yield planes", Ly Corrections to the paper "A matrix structural tbeo O, oJ piecewise linear elastoplasti¢i O' w#b interacting.yield planes", Ly

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Hybrid composite laminates reinforced with glass/carbon woven fabrics for lightweight load bearing structures

2011-11-13

Jin Zhang , Khunlavit Chaisombat , Shuai He +1 more

Mechanical engineering design

1985-07-01

T.Y. Reddy

Fundamentals of Vibrations

2000-12-14

Robert H. Fries

Vibrating systems contain both energy-storage and energy-dissipating elements. Energy is stored as either potential energy or kinetic energy. In mechanical systems, potential energy is stored elastically in compliant elements modeled … Vibrating systems contain both energy-storage and energy-dissipating elements. Energy is stored as either potential energy or kinetic energy. In mechanical systems, potential energy is stored elastically in compliant elements modeled as springs and it is also stored as changes in the elevation of masses in a gravitational field.

Advances in Applied Mechanics

1981-03-01

Jacek Gierlinski

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The Helix-Coil Transition in Solutions of Polyglutamic Acid

1964-02-01

Mitsuru Nagasawa , Alfred Holtzer

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Helix-Coil Transition in Solutions of Polyglutamic AcidMitsuru. Nagasawa and Alfred. HoltzerCite this: J. Am. Chem. Soc. 1964, 86, 4, 538–543Publication Date (Print):February 1, 1964Publication History Published … ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Helix-Coil Transition in Solutions of Polyglutamic AcidMitsuru. Nagasawa and Alfred. HoltzerCite this: J. Am. Chem. Soc. 1964, 86, 4, 538–543Publication Date (Print):February 1, 1964Publication History Published online1 May 2002Published inissue 1 February 1964https://pubs.acs.org/doi/10.1021/ja01058a002https://doi.org/10.1021/ja01058a002research-articleACS PublicationsRequest reuse permissionsArticle Views874Altmetric-Citations258LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

An introduction to composite materials

1997-02-01

David Roylance

This module introduces basic concepts of stiffness and strength underlying the mechanics of fiber-reinforced advanced composite materials. This aspect of composite materials technology is sometimes terms “micromechanics,” because it deals … This module introduces basic concepts of stiffness and strength underlying the mechanics of fiber-reinforced advanced composite materials. This aspect of composite materials technology is sometimes terms “micromechanics,” because it deals with the relations between macroscopic engineering properties and the microscopic distribution of the material’s constituents, namely the volume fraction of fiber. This module will deal primarily with unidirectionally-reinforced continuous-fiber composites, and with properties measured along and transverse to the fiber direction.

Mechanical vibrations

1958-05-01

Henry Clarke

Machinery's Handbook

1979-04-01

A Sparsity-Oriented Approach to the Dynamic Analysis and Design of Mechanical Systems—Part 1

1977-08-01

N. Orlandea , M. A. Chace , D. A. Calahan

The work described herein is an extension of sparse matrix and stiff integrated numerical algorithms used for the simulation of electrical circuits and three-dimensional mechanical dynamic systems. By applying these … The work described herein is an extension of sparse matrix and stiff integrated numerical algorithms used for the simulation of electrical circuits and three-dimensional mechanical dynamic systems. By applying these algorithms big sets of sparse linear equations can be solved efficiently, and the numerical instability associated with widely split eigenvalues can be avoided. The new numerical methods affect even the initial formulation for these problems. In this paper, the equations of motion and constraints (Part 1) and the force function of springs and dampers (Part 2) are set up, and the numerical solutions for static, transient, and linearized types of analysis as well as the modal optimization algorithms are implemented in the ADAMS (automatic dynamic analysis of mechanical systems) computer program for simulation of three-dimensional mechanical systems (Part 2). The paper concludes with two examples: computer simulation of the front suspension of a 1973 Chevrolet Malibu and computer simulation of the landing gear of a Boeing 747 airplane. The efficiency of simulation and comparison with experimental results are given in tabular form.

Mechanical Engineering Design

2020-10-16

Ansel C. Ugural , Youngjin Chung , Errol A. Ugural

Mechanical Engineering Design, Third Edition strikes a balance between theory and application, and prepares students for more advanced study or professional practice. Updated throughout, it outlines basic concepts and provides … Mechanical Engineering Design, Third Edition strikes a balance between theory and application, and prepares students for more advanced study or professional practice. Updated throughout, it outlines basic concepts and provides the necessary theory to gain insight into mechanics with numerical methods in design. Divided into three sections, the text presents background topics, addresses failure prevention across a variety of machine elements, and covers the design of machine components as well as entire machines. Optional sections treating special and advanced topics are also included. Features: Places a strong emphasis on the fundamentals of mechanics of materials as they relate to the study of mechanical design Furnishes material selection charts and tables as an aid for specific uses Includes numerous practical case studies of various components and machines Covers applied finite element analysis in design, offering this useful tool for computer-oriented examples Addresses the ABET design criteria in a systematic manner Presents independent chapters that can be studied in any order Introduces optional MATLAB® solutions tied to the book and student learning resources Mechanical Engineering Design, Third Edition allows students to gain a grasp of the fundamentals of machine design and the ability to apply these fundamentals to various new engineering problems.

Handbook of Engineering Mechanics

1963-03-01

W. Flu ̈gge

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Engineering Mechanics

2006-01-01

C Hartsuijker , J. W. Welleman

Mechanical Vibrations

2011-09-16

Tony L. Schmitz , Scott Smith

Loss Factors of Viscoelastic Systems in Terms of Energy Concepts

1962-07-01

Eric E. Ungar , Edward Kerwin

The definition of loss factor in terms of energy quantities is reexamined, particularly as it applies to composite viscoelastic systems. A restatement of this definition in terms of a corresponding … The definition of loss factor in terms of energy quantities is reexamined, particularly as it applies to composite viscoelastic systems. A restatement of this definition in terms of a corresponding viscoelastic spring is used to show that this definition is extremely useful for massless (ideal viscoelastic spring) systems, but may be applied unambiguously to spring systems with a single attached mass only at resonance. Simple relations are derived which express the loss factors of series-parallel arrays of massless viscoelastic springs in terms of properties of the individual components; application of these relations to damping analyses of composite structures should result in considerable economy of effort.

A matrix structural theory of piecewise linear elastoplasticity with interacting yield planes

1970-03-01

G. Maier

Mechanical Vibrations

1948-04-01

A. L. P.

DEN HARTOG'S book combines mathematical simplicity with a rare insight into the physical nature of vibrations, and its author has a happy knack of explaining things in a way that … DEN HARTOG'S book combines mathematical simplicity with a rare insight into the physical nature of vibrations, and its author has a happy knack of explaining things in a way that the less gifted can understand. For these reasons, and for the wealth of information it contains, the book has long been a standard work in Great Britain as well as in the United States. Mechanical Vibrations By Prof. J. P. Den Hartog. Third edition. Pp. xi + 478. (New York and London: McGraw-Hill Book Co., Inc., 1947.) 30s.

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HANDBOOK ON EXPERIMENTAL MECHANICS

1989-08-01

Vehicle Dynamics and Control

2006-01-01

Rajesh Rajamani

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Mechanical Engineering Design

2016-09-07

M. Selvaraj , M.S. Alphin , M. Nalla Mohamed +1 more

Advances in Mechanical Engineering

2015-11-27

T. Rajmohan , S. Arumugam , K. Palanikumar

Advances in Applied Mechanics

2023-12-18

Z. Azari , Khalid El Had , Mohamed ElAmine Ait Ali +3 more

Retraction: AI-assisted design of lightweight and strong 3D-printed wheels for electric vehicles

2025-06-25

| PLoS ONE

Topology Optimization Design of Flexible Micro-clamp Considering Clamp Stability

2025-06-24

Meng Zhang , LIU Shicheng , Yuqing Zhu +2 more | Journal of Micromechanics and Microengineering

Abstract Flexible micro-clamps induce parasitic displacements at the output port during the clamping process, leading to tilting and instability. This study proposes a multi-constraint topology optimization model, leveraging the variable … Abstract Flexible micro-clamps induce parasitic displacements at the output port during the clamping process, leading to tilting and instability. This study proposes a multi-constraint topology optimization model, leveraging the variable density method to enhance clamping stability. The objective function aims to maximize the displacement amplification ratio, subject to constraints on parasitic displacements and displacement variations between the two ends of the output port. Sensitivities of both the objective and constraint functions are derived and solved using the method of moving asymptotes (MMA), yielding a design that achieves both high amplification and clamping stability. The experimental results show that when an input voltage of 120V is applied to the piezoelectric ceramic, the flexible micro-clamp exhibits a bidirectional amplification ratio of 8.06, while its relative parasitic displacement and relative parallelism displacement are 0.53% and 0.79%, respectively.

Optimal design and experimental validation of composite driveshafts: a comprehensive methodology

2025-06-24

Brian Farid Morales-Hernández , Heller Guillermo Sánchez Acevedo , Reynel Germán Barrera-Santos | The International Journal of Advanced Manufacturing Technology

Dynamic Analysis of Half-Car Suspension Systems Using MATLAB Simulink and ANSYS

2025-06-24

Kribanandan Gurusamy Naidu | INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT

This study presents the dynamic modelling, simulation and analysis of a half-car suspension system using both passive and active suspension configurations. A vertical half-car 4-DOF (degree of freedom) model is … This study presents the dynamic modelling, simulation and analysis of a half-car suspension system using both passive and active suspension configurations. A vertical half-car 4-DOF (degree of freedom) model is developed to analyse pitch and bounce motions. The project integrates MATLAB Simulink for time-domain analytical simulations and ANSYS finite element analysis (FEA) for numerical validation. The objective is to evaluate suspension behaviour under road disturbances at speeds ranging from 10 to 45 km/h. The analysis demonstrates that active suspensions significantly improve ride comfort and handling compared to passive systems, although they involve higher complexity and cost.

A novel model for bicycle drivetrain efficiency

2025-06-23

Teal Dowd , Patrick J. Cavanaugh , Jan-Anders Månsson | Sports Engineering

Abstract This study introduces a new model for bicycle drivetrain efficiency, termed the “DCM” model. This model is used for characterizing cycling drivetrain efficiency across varying conditions—a critical factor in … Abstract This study introduces a new model for bicycle drivetrain efficiency, termed the “DCM” model. This model is used for characterizing cycling drivetrain efficiency across varying conditions—a critical factor in optimizing the performance of bicycles in competitive, recreational, and transportation contexts. A testing rig was developed to measure drivetrain efficiency under different simulated riding conditions, with a focus on the performance of chains using various lubricants tested over torque and angular velocity combinations. Analysis revealed a linear relationship ( $$R^2> 0.99$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>R</mml:mi> <mml:mn>2</mml:mn> </mml:msup> <mml:mo>></mml:mo> <mml:mn>0.99</mml:mn> </mml:mrow> </mml:math> ) between efficiency and the DCM metric, defined as $$DCM_{\text {metric}} = \frac{{\omega _{\text {wheel}}}^{0.3}}{{\tau }_{\text {crank}}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>D</mml:mi> <mml:mi>C</mml:mi> <mml:msub> <mml:mi>M</mml:mi> <mml:mtext>metric</mml:mtext> </mml:msub> <mml:mo>=</mml:mo> <mml:mfrac> <mml:msup> <mml:mrow> <mml:msub> <mml:mi>ω</mml:mi> <mml:mtext>wheel</mml:mtext> </mml:msub> </mml:mrow> <mml:mrow> <mml:mn>0.3</mml:mn> </mml:mrow> </mml:msup> <mml:msub> <mml:mi>τ</mml:mi> <mml:mtext>crank</mml:mtext> </mml:msub> </mml:mfrac> </mml:mrow> </mml:math> providing a framework for predicting drivetrain efficiency. Through regression analysis, the slope and the intercept of this linear relationship were used as all-encompassing parameters that characterize drivetrain performance, facilitating the selection of lubricant based on anticipated cycling conditions. The DCM model establishes a robust framework for advancing both practical applications and scientific understanding of cycling drivetrain efficiency. The DCM model’s broad applicability in analyzing efficiency across different situations offers opportunities for optimizing drivetrain performance, especially in aligning mechanical and physiological efficiencies for prolonged power outputs.

Balancing Cam Mechanism for Instantaneous Torque and Velocity Stabilization in Internal Combustion Engines: Simulation and Experimental Validation

2025-06-21

Daniel Filipe da Silva Cardoso , Paulo Fael , Pedro Dinis Gaspar +1 more | Energies

Torque and velocity fluctuations in internal combustion engines (ICEs), particularly during idle and low-speed operation, can reduce efficiency, increase vibration, and impose mechanical stress on coupled systems. This work presents … Torque and velocity fluctuations in internal combustion engines (ICEs), particularly during idle and low-speed operation, can reduce efficiency, increase vibration, and impose mechanical stress on coupled systems. This work presents the design, simulation, and experimental validation of a passive balancing cam mechanism developed to mitigate fluctuations in single-cylinder internal combustion engines (ICEs). The system consists of a cam and a spring-loaded follower that synchronizes with the engine cycle to store and release energy, generating a compensatory torque that stabilizes rotational speed. The mechanism was implemented on a single-cylinder Honda® engine and evaluated through simulations and laboratory tests under idle conditions. Results demonstrate a reduction in torque ripple amplitude of approximately 54% and standard deviation of 50%, as well as a decrease in angular speed fluctuation amplitude of about 43% and standard deviation of 42%, resulting in significantly smoother engine behavior. These improvements also address longstanding limitations in traditional powertrains, which often rely on heavy flywheels or electronically controlled dampers to manage rotational irregularities. Such solutions increase system complexity, weight, and energy losses. In contrast, the proposed passive mechanism offers a simpler, more efficient alternative, requiring no external control or energy input. Its effectiveness in stabilizing engine output makes it especially suited for integration into hybrid electric systems, where consistent generator performance and low mechanical noise are critical for efficient battery charging and protection of sensitive electronic components.

Determining the position function of sewing machine mechanisms using the triangle method

2025-06-21

Zhaksybek Usenbekov , G. Baqytzhan | The Journal of Almaty Technological University

The quality of the stitches performed largely depends on the interaction of the working tools of sewing machines, so their exact location during the kinematic cycle is important. The location … The quality of the stitches performed largely depends on the interaction of the working tools of sewing machines, so their exact location during the kinematic cycle is important. The location of the working tools is determined by the function of the position of the mechanism. The position function of the mechanisms is determined by analyzing their kinematic schemes. In practice, the method of closed vector contours and the triangle method are most widely used. The use of the closed vector contour method is not universal compared to the triangular contour method. The use of these methods for flat, kinematically complex sewing machine mechanisms makes it possible to develop universal programs by pre-distributing the component modifications of links and dyads into hierarchical structural modules and selecting and composing the main program from the prepared subprograms for them. The paper presents routines in the Python language, applied to the mechanism of the sewing machine 852 cl. At the same time, a structural diagram of the mechanism for modifications of links and dyadic groups is shown, which made it possible to develop a summary program for calculating the position functions of working tools and plot their graphs. The analysis of the calculated data will ensure the high-quality operation of the mechanism and the availability of working tools.

Intentionally informing product innovation with an updated habitual motion path deviation analysis

2025-06-20

Evan M. Day , Rebekah R. Pallone , Megan Saftich +2 more | Footwear Science

Pengaruh Sudut Drive Pulley dan Massa Roller terhadap Daya dan Tingkat Kebisingan pada Sepeda Motor Bertransmisi Otomatis 110cc

2025-06-20

Bagus Irawan , Purwoko Purwoko , Ratna Monasari +1 more | Deleted Journal

Automatic transmission motorcycles, especially those with 110cc engines, are increasingly in demand by the public because of their practicality. The performance of this motorcycle is greatly influenced by the transmission … Automatic transmission motorcycles, especially those with 110cc engines, are increasingly in demand by the public because of their practicality. The performance of this motorcycle is greatly influenced by the transmission system, especially the Drive pulley and Roller components. The correct setting of the Drive pulley angle and Roller mass can improve engine performance and reduce noise, thus supporting driving comfort. This study aims to analyze the effect of variations in the Drive pulley angle and Roller mass on engine performance, in terms of power (HP), torque (Nm), and noise level (dB) at several engine speeds. The variations tested include the Drive pulley angle of 13.5°–14° and the Roller mass of 13–15 grams, with testing at 5000, 6000, 7000, and 8000 RPM. The test results show that the combination of the angle and Roller mass affects engine performance. At 5000 RPM, the combination of the 14° angle and 15 gram Roller produces the highest power, torque, and noise. At 6000 RPM, the combination of 13.8° and 13 grams produces a maximum power of 6.86 HP and 8.15 Nm of torque, with a noise of 97.40 dB. While at 7000–8000 RPM, the combination of 13.5° and 15 grams provides the best performance with 7.10 HP and 6.30 Nm of torque, accompanied by a noise of 104.17 dB. In general, increasing the angle and mass of the Roller increases performance, but is followed by an increase in noise.

Cam pair Wear analysis based on conjugate cam pair clearance collision and lubrication models

2025-06-20

Dandan Li , Chi Xue , Zhan Wei +4 more | Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology

Conjugate cams are widely used in the beating-up mechanism of modern high-speed rapier looms, and the collision and friction between the cams and rollers significantly impact the service life of … Conjugate cams are widely used in the beating-up mechanism of modern high-speed rapier looms, and the collision and friction between the cams and rollers significantly impact the service life of the cams. To investigate the relationships among cam rotation speed, clearance collision, and lubrication wear, the conjugate cam beating-up mechanism was selected as the research object. A dynamic model for clearance collision of conjugate cam pairs was established, and cam wear under different working conditions was simulated and calculated based on the Archard adhesion wear model. The research results indicate that as the driving speed increases, the cam impact force also increases accordingly, leading to increased cam wear. Additionally, an increase in cam clearance can raise the peak contact load between the cam and the roller, resulting in an increase in the peak depth of cam wear. By establishing a model and comprehensively analyzing the effects of speed and clearance, important theoretical basis is provided for predicting and enhancing the service life of conjugate cams.

Design and stiffness assessment of non-pneumatic bicycle tyres with latticed cores produced by fused filament fabrication

2025-06-19

Pedro Tomé , Manuel Sardinha , M. Fátima Vaz +1 more | Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications

Conventional tyres often suffer from issues such as air pressure maintenance and blowouts. Recently, companies have begun developing non-pneumatic tyres (NPTs) made from rubber-like materials, offering potential benefits such as … Conventional tyres often suffer from issues such as air pressure maintenance and blowouts. Recently, companies have begun developing non-pneumatic tyres (NPTs) made from rubber-like materials, offering potential benefits such as reduced environmental impact. However, research on this technology remains relatively underexplored. This study investigates the design, and mechanical performance of NPTs produced via fused filament fabrication (FFF) using thermoplastic polyurethane. The NPTs were developed through iterative design stages, combining experimental testing and numerical analysis for evaluation. Two base lattice configurations were employed: a hexagonal honeycomb and a hollow spherical-based structure. Initially, relative density was kept constant while cell size was varied to assess its effect on vertical stiffness and energy absorption. Based on the results, one design from each lattice type was refined, focusing on shear layer geometry and cell wall thickness. Compression tests evaluated vertical stiffness and energy absorption, while numerical simulations also analysed lateral and longitudinal stiffness to simulate cornering and braking scenarios. The numerical simulations are performed using a nine-parameter Mooney-Rivlin hyperelastic material model calibrated from experimental stress-strain data. Results indicated that hexagonal designs exhibited higher vertical and lateral stiffness, while spherical designs demonstrated superior longitudinal stiffness. Design adjustments yielded NPTs with vertical stiffness closely aligning with standard commuter bicycle tyres. Deformation behaviour revealed a combination of bending and elastic buckling in cell walls, with numerical simulations capturing key trends despite underestimating stiffness. This study demonstrates the feasibility of functionally optimized NPTs via FFF, offering a promising alternative for bicycle tyres.

Modelling wear of truck tyres under high slip

2025-06-18

Chen Liu , David Cebon | Vehicle System Dynamics

The Use of Matlab Routines for Teaching Simgle-Degree-Of-Freedom Mass-Spring Vibration Systems

2025-06-18

Julio Cézar de Almeida , Alexandre Pescador Sardá , Leomar Gomes Júnior +1 more | Revista de Gestão Social e Ambiental

Objective: The objective of this study is to present a conceptual and mathematical review of conventional mechanical vibration problems involving a mass-spring system with one degree of freedom. Theoretical Framework: … Objective: The objective of this study is to present a conceptual and mathematical review of conventional mechanical vibration problems involving a mass-spring system with one degree of freedom. Theoretical Framework: The theoretical framework considered is based on the conventional mathematical formulation of vibration problems with one degree of freedom, including systems without damping and with damping, as well as free systems and forced systems. Method: The methodology adopted for this research involves the use of simplified computational implementations, which were returned from the Matlab programming language. Results and Discussion: The results of this research include a significant contribution to the teaching and learning of mathematically demanding disciplines, in which, in many circumstances, undergraduate students have difficulty not only in understanding, but mainly in visualizing the physical phenomenon in question. Research Implications: This proposal may contribute additionally to the context of a wider range of computational implementations to be developed in the broad area of engineering, always favoring the teaching and learning aspect of the students involved. Originality/Value: The value of the work is directly related to the possibility of readers reproducing different and varied results, from simple manipulations of the input data of each proposed computational code, as a consequence of these being fully available in the appendix.

Integrated Design and Analysis of a Battery Mounting Bracket Tray in Four-Wheelers

2025-06-17

Varad Joshi , Dnyaneshwar M. Mate | International Journal of Science and Research (IJSR)

The Influence of Pneumatic Lumbar Support on Pressure Distribution of Pilot Rocket Ejection Seats

2025-06-16

Jun Li , Wujun Xie , Hui Li +1 more | Advances in transdisciplinary engineering

Prolonged flights by pilots are highly prone to causing lumbar injuries, which can subsequently degrade combat effectiveness and increase flight safety hazards. Therefore, beyond ensuring the life safety of pilots … Prolonged flights by pilots are highly prone to causing lumbar injuries, which can subsequently degrade combat effectiveness and increase flight safety hazards. Therefore, beyond ensuring the life safety of pilots in emergency situations, rocket ejection seats also necessitate ergonomic design to mitigate lumbar injuries resulting from extended periods of sitting. Human pressure distribution indicators for seats can effectively reflect the protective performance for pilots. Consequently, to assess the enhancement effects from pneumatic lumbar support for seat comfort design, human pressure distribution for seat cushion and lumbar support before and after inflation was measured using a flexible pressure testing system. A paired samples test was employed to analyze changes in key human pressure distribution metrics comprising peak and average pressure, contact area, average and peak pressure gradient, Seat Pressure Distribution. Findings indicate that using pneumatic lumbar support nearly doubled the value of Seat Pressure Distribution for seat cushion compared to the uninflated state; the inflated lumbar support significantly increased peak and average pressure, peak pressure gradient, and Seat Pressure Distribution in lumbar region, reflecting enhanced lumbar support and providing a reference standard for seat design improvement.

Thermal Analysis of a Novel Fan-out Packaging Structure Optimized with Graphene

2025-06-16

Zhiyuan Wu , Zhenxiang Dai , Ye Guo +3 more | Engineering Research Express

Abstract Heat dissipation is regarded as one of the most critical issues in high-density fine-pitch fan-out packages. Copper is utilized in the redistribution layer (RDL) for signal transmission and thermal … Abstract Heat dissipation is regarded as one of the most critical issues in high-density fine-pitch fan-out packages. Copper is utilized in the redistribution layer (RDL) for signal transmission and thermal dissipation, however, optimal heat transfer is not consistently achieved. Due to the superior thermal conductivity of graphene, a composite structure of ‘graphene & copper’ for the RDL was proposed. We constructed a model of the Fan-out package with the composite RDL, which was simplified based on the principle of materials equivalence. The model was validated through finite-element simulation, thereby was adopted for evaluating the thermal performance of the Fan-out packages. The results revealed that the average temperature was reduced by 1.6% compared with that of the conventional structure. The integration of graphene improves the heat dissipation in the package. The most significant factors affecting the maximum temperature are the inclusion of the graphene layer and the package/chip ratio (P/C). Therefore, the composite structure of RDL is effective for solving the problem of heat dissipation in electronic devices.

Investigation of mechanical strength and deformation properties of Y25 bogie suspension systems by finite element analysis

2025-06-16

Celalettin Baykara | Railway Sciences

Purpose This paper aims to offer a novel viewpoint for improving performance and reliability by developing and optimizing suspension components in a Y25 bogie through material optimization based on wheel–rail … Purpose This paper aims to offer a novel viewpoint for improving performance and reliability by developing and optimizing suspension components in a Y25 bogie through material optimization based on wheel–rail interactions under variable load and track conditions. Design/methodology/approach The suspension system, a critical component ensuring adaptation to road and load conditions in all vehicle types, is especially vital in heavy freight and passenger trains. In this context, the suspension set of the Y25 bogie – commonly used in Türkiye and Europe – was modelled using CATIA V5, and stress analyses have been performed by way of ANSYS using the finite element analysis (FEA) method. E300-520-M cast steel was selected for the bogie frame, while two different spring steels, 61SiCr7 and 51CrV4, were considered for the suspension springs. The modeled system was subjected to numerical analysis under loading conditions. The resulting stresses and displacements were compared with the mechanical properties of the selected materials to validate the design. Findings The results demonstrate that the mechanical strength and deformation characteristics of the suspension components vary according to the applied external loads. The stress and displacement responses of the system were found to be within the allowable limits of the selected materials, confirming the structural integrity and reliability of the design. The suspension set is deemed suitable for the prescribed material and environmental conditions, suggesting potential for practical application in real-world rail systems. Originality/value This research contributes to the design and optimization of bogie suspension systems using advanced CAD/CAE tools. It thinks that the material selection and numerical validation approach presented here can guide future designs in heavy load rail applications and potentially improve both safety and performance.

Backbone Rigidity Encodes Universal Viscoelastic Signatures in Biomolecular Condensates

2025-06-15

Sean Yang , Subhadip Biswas , Davit A. Potoyan | bioRxiv (Cold Spring Harbor Laboratory)

Biomolecular condensates exhibit a wide range of viscoelastic properties shaped by their molecular sequence and composition. Coarse-grained molecular models of intrinsically disordered proteins are widely used to complement experiments by … Biomolecular condensates exhibit a wide range of viscoelastic properties shaped by their molecular sequence and composition. Coarse-grained molecular models of intrinsically disordered proteins are widely used to complement experiments by revealing the structure and thermodynamics of condensates. However, fully flexible chain representations of inherently disordered proteins often fail to capture their complex viscoelastic behavior, instead predicting purely viscous responses. In this work, we demonstrate that introducing sequence-dependent chain rigidity enables the accurate reproduction of the elastic and viscous moduli for experimentally characterized condensates of A1-LCD and its numerous mutants. Furthermore, we show that the frequency-dependent loss factor can be described by a single parameter that universally correlates with viscosity across different sequences and variations of the coarse-grained molecular energy function. Our results also reveal that increased chain rigidity, indicated by a larger gyration radius, expands the condensates' elastic regime. Finally, we elucidate the microscopic origins of sequence-encoded viscoelasticity by showing how it can be tuned through sequence rearrangements that promote sticker cluster formation.

Optimization of Cam-forming Process for Side Bead Considering Springback

2025-06-15

J. W. Yun , Yujin Chae , Seongsik Lim +2 more | Journal of The Korean Society of Manufacturing Technology Engineers

Design And Analysis of a High-Performance Powertrain for a Sae Baja Racing Off-Road Vehicle

2025-06-15

R .Shiva | INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT

ABSTRACT - This paper presents the comprehensive design and analysis of a high-performance powertrain for an SAE Baja off-road vehicle powered by a 300cc, 10 horsepower engine. It focuses on … ABSTRACT - This paper presents the comprehensive design and analysis of a high-performance powertrain for an SAE Baja off-road vehicle powered by a 300cc, 10 horsepower engine. It focuses on the integration and performance of a Continuously Variable Transmission (CVT), emphasizing its role in delivering maximum torque and efficiency under varied terrain. Key contributions include detailed component selection, solid modeling using SolidWorks, and simulation via ANSYS for structural integrity and fatigue life estimation. The results show that a CVT combined with an optimized fixed gear ratio can achieve the torque multiplication needed for competitive acceleration and hill climb capabilities. Material selection using DFMA principles and fatigue-safe design ensures durability and compliance with SAE standards. The study concludes with a performance comparison against historical Baja benchmarks and proposes future enhancements including the use of electronic CVTs and AI-based tuning.

Pengaruh Head Terhadap Kecepatan Dan Debit Aliran Irigasi Tetes Bertingkat Berdasarkan Volume Aliran Tertampung

2025-06-15

I Dewa Gede Jaya Negara , Anid Supriyadi , I Wayan Yasa +2 more | Deleted Journal

The secondary pipe network in a multi-level drip irrigation network is a water source that will serve the drip irrigation network at each level. The amount of flow obtained by … The secondary pipe network in a multi-level drip irrigation network is a water source that will serve the drip irrigation network at each level. The amount of flow obtained by the drip irrigation network is highly dependent on the available head height from the water source. This study aims to determine the amount of flow discharge produced by the height of the water source head in a four-level drip irrigation pipe network, so that it can be used for optimal design of a multi-level drip irrigation network. Optimization of the irrigation network is reviewed against the amount of deviation of discharge from the primary network to the drip discharge, as the final result of irrigation to the plants. The test was carried out on a 4-level drip irrigation network with a water source height from the reservoir of 3.21m with a capacity of 200 liters. The head variation consists of four types according to the amount of height of the drip irrigation network to the surface of the reservoir water. The main data analyzed are the volume of flow collected, discharge, speed and deviation of discharge or speed. While the presentation of the results is displayed in the form of regression graphs between the two test parameters, so that they can be applied generally. In the secondary pipe, there is an average difference in flow velocity of around 0.05 m/s in each network, with the lowest secondary flow rate deviation obtained at a small head of 0.2 cm3/s between the fourth and third floors, while the highest discharge deviation is obtained on the first and second floor networks, which is around 1.6 cm3/s. Low vt deviation is obtained at a head below 2.3m and the highest occurs at a head above 2.3m. The difference in head in the primary and secondary distribution networks does not have a significant effect on the distribution of drip irrigation flow, if the drip points are more numerous, the deviation is still within reasonable limits.

Design and Fabrication of Layered Fiber-Reinforced Polymer Spring for Lightweight Vehicles

2025-06-14

Dhia A. Alazawi , Mohammed Ismael Hameed | Iraqi Journal of Industrial Research

Reducing the weight of a vehicle is a key aspect that affects its performance, driving economy and overall safety. The suspension system is one of the major components for weight … Reducing the weight of a vehicle is a key aspect that affects its performance, driving economy and overall safety. The suspension system is one of the major components for weight saving in vehicles as it contributes to a considerable rate of the unsprung weight. The developing of hybrid materials technology can be employed for avoiding bulky leaf spring with identical load carrying ability and stiffness. This paper describes the design and experimental analysis of composite leaf spring made of woven glass fiber reinforced polymer (FRP). The main goal of this study is to investigate the load carrying capability, stiffness, and possibility for weight minimization in composite materials as a lightweight alternative to conventional metallic leaf springs. The effective geometric parameters have been designed for 1000 kg automobile mass. The finite element analysis has been used as a computer-based simulation technique for prediction spring thickness (h) related to safe displacement and induced stress due to the applied load. The numerical and experimental outcomes demonstrate the strength, durability, and fatigue performance of composite materials. Additionally, the proposed fabricated prototype demonstrates an 80% weight reduction compared to a steel multi leaf spring, confirming its suitability for lightweight and high efficiency applications.

Design Optimization and Fabrication of Metal 3D Printed Wheel Hub Using AlSi10Mg: A Comprehensive Review

2025-06-14

Y.V. Durga Sai , Shyam K. Ladhad , Rajesh Ramesh +2 more | Journal of Advanced Manufacturing Systems

The industry of manufacturing has undergone a remarkable shift with the advent of Metal 3D printing technology, which offers unmatched design and optimization flexibility. The idea of metal 3D printing … The industry of manufacturing has undergone a remarkable shift with the advent of Metal 3D printing technology, which offers unmatched design and optimization flexibility. The idea of metal 3D printing is important to this generation of the fourth industrial revolution within the context of Industry 4.0. Utilizing the goals of metal additive manufacturing (AM) technology, this review aims to develop and create high-performance wheel hubs for automotive and aerospace applications utilizing the aluminum-based alloy AlSi10Mg. The amount of literature that was reviewed assisted in determining a number of factors to be taken into account while carrying out the task as well as in deciding on the material and method that would be used for fabrication. The study uses physical testing and a numerical approach to assess the wheel hub performance. From the available literature, Subramanian and Oza [Strength analysis of a ventilated brake disc-hubassembly for a multi-utility vehicle, Int. Res. J. Eng. Technol. 2(2) 726-730 2015] found that AlSi10Mg is the most suitable material which can be used for fabricating a wheel hub. The design of the wheel hub has been analyzed in the Ansys software based on the results obtained; it was found out that the maximum von-Mises stress is 110–120 MPa and the deformation ranges from 0.15–0.25 mm with FOS ranging in 2.5–2.8 which falls under the real-life application. The weight reduction in the wheel hub from the initial wheel hub dropped at around 31.61% of its weight helped in increasing other parameters of the vehicle. Future research will be concentrated on identifying better ways to optimize the existing wheel hub design and, if relevant, adopting a better production process.

Elektrikli Motosiklet İçin Fırçasız Doğru Akım ve Asenkron Motorun Karşılaştırmalı Analizi: Tasarım, Performans ve Optimizasyon

2025-06-14

Hakan Kahveci , Furkan Muhammed Kırıkcı , Ömür Akyazı | Karadeniz Fen Bilimleri Dergisi

Elektrikli motosikletler, fosil yakıtlara olan bağımlılığı ortadan kaldırmada önemli bir adım olmaları nedeniyle literatürde büyük bir öneme sahiptir. Literatürde, asenkron motorlar (ASM) basit tasarımları, düşük üretim maliyetleri ve dayanıklılıklarıyla; fırçasız … Elektrikli motosikletler, fosil yakıtlara olan bağımlılığı ortadan kaldırmada önemli bir adım olmaları nedeniyle literatürde büyük bir öneme sahiptir. Literatürde, asenkron motorlar (ASM) basit tasarımları, düşük üretim maliyetleri ve dayanıklılıklarıyla; fırçasız doğru akım motorlar (FDAM) ise yüksek verimlilik, tork yoğunluğu ve hassas hız kontrol özellikleriyle ön plana çıkmaktadır. FDA motorların, tekerlek içi (hub motor) uygulamalarda kullanılabilmesi elektrikli motosikletlerde güç aktarım organlarına duyulan ihtiyacı ortadan kaldırmaktadır. Özellikle dıştan rotorlu FDA motorlar ise yüksek tork yoğunluğu ve üstün soğutma özellikleri sayesinde literatürde popüler bir araştırma konusu olmaya devam etmektedir. Bu çalışmada, bir elektrikli motosikletin fiziksel kuvvet hesaplamalarına dayalı olarak (2.2-2.3) kW çıkış gücünü sağlayabilecek ASM ile dıştan rotorlu FDAM tasarımları, Sonlu Elemanlar Yöntemi (SEY) kullanan ANSYS Electronics-Maxwell programında gerçekleştirilmiştir. Motorların hız, verim ve tork parametreleri değerlendirilmiş, ayrıca 2D-Maxwell ortamında akı yoğunlukları incelenmiştir. Elde edilen sonuçlar (%91.14 verim; 50.5 Nm; 11.067 kg), motosiklet uygulamasında FDA motorun üstün olduğunu göstermektedir. Genetik algoritma kullanılarak yapılan optimizasyon ile FDAM’ın istenmeyen Cogging torkunda azalma gerçekleştirilmiştir. Değerlendirme, aynı nüve ve sargı malzemeleri referans alınarak yapılmıştır. Çalışmada, motor tasarım ve optimizasyon yöntemlerinin sunulması literatüre ve uluslararası yarışmalara önemli katkılar sağlamaktadır.

PERBANDINGAN KARAKTERISTIK DAN KUALITAS JAHITAN BENANG MEREK X DAN Y PADA CELANA BERBAHAN KAIN TENUN

2025-06-14

Reski Alya Pradifta , Andhi Sukma Hanafi , Wawan Dwi Novianto +2 more | KNOWLEDGE Jurnal Inovasi Hasil Penelitian dan Pengembangan

The textile industry requires high-kualitasnce sewing threads to ensure product quality, particularly in terms of seam tensile strength, which is a critical factor in garment applications. Standards such as SNI … The textile industry requires high-kualitasnce sewing threads to ensure product quality, particularly in terms of seam tensile strength, which is a critical factor in garment applications. Standards such as SNI 8213:2016 and SNI ISO 13935-1:2012 serve as benchmarks for evaluating the quality of threads and seams. However, comprehensive comparative studies on the kualitasnce of specific thread brands remain limited. This study aims to evaluate the single thread and seam tensile strength of two brands of polyester 40/2 sewing threads, Brand X and Brand Y, using controlled standard parameters. The methods applied include thread count testing, elongation, single thread tensile strength (tenacity), and seam tensile strength in accordance with SNI 8213:2016 and SNI ISO 13935-1:2012. Seams were constructed on woven fabric using a lockstitch machine, Dbx1 85/13 needle, and 12 SPI. Data were analyzed using multiple linear regression to determine significant differences and correlations between thread brands. Results show that Brand X has a single thread tensile strength of 35.27 cN/tex, and Brand Y has 33.00 cN/tex, both meeting the minimum standard of 33 cN/tex. The seam tensile strength was 369.62 N for Brand X and 301.11 N for Brand Y, with a statistically significant difference based on regression analysis (? = 0.5049x - 178.77). This study confirms that Brand X outperforms Brand Y, particularly in seam tensile strength. The contribution of this research lies in its multidimensional approach to thread quality evaluation, offering valuable references for the textile industry in selecting appropriate sewing threads for specific applications. Further research is recommended to explore the effects of stitch parameter variations and environmental conditions on seam quality. ABSTRAKIndustri tekstil memerlukan benang jahit dengan kualitas tinggi untuk mendukung kualitas produk, khususnya dalam aspek kekuatan tarik jahitan yang menjadi faktor penting pada aplikasi pakaian. Standar SNI 8213:2016 dan SNI ISO 13935-1:2012 telah menjadi acuan dalam mengevaluasi mutu benang dan jahitan, namun penelitian terhadap kualitas merek benang tertentu dengan metode analisis komprehensif masih terbatas. Penelitian ini bertujuan untuk mengevaluasi kekuatan tarik helai dan jahitan dua merek benang poliester 40/2, yakni merek X dan Y, menggunakan parameter standar yang terkontrol. Metode yang digunakan mencakup pengujian nomor benang, elongasi, kekuatan tarik helai (tenacity), dan kekuatan tarik jahitan sesuai SNI 8213:2016 dan SNI ISO 13935-1:2012. Jahitan dibuat pada kain tenun menggunakan jenis mesin lockstitch, jarum Dbx1 85/13, dan SPI 12. Data dianalisis menggunakan regresi linier berganda untuk mengidentifikasi hubungan dan perbedaan signifikan antara merek benang. Hasil menunjukkan bahwa benang X memiliki kekuatan tarik helai sebesar 35,27 cN/tex dan benang Y sebesar 33,00 cN/tex, yang keduanya memenuhi standar minimal 33 cN/tex. Kekuatan tarik jahitan menunjukkan nilai 369,62 N untuk benang X dan 301,11 N untuk benang Y, dengan perbedaan signifikan berdasarkan analisis regresi (? = 0,5049x - 178,77). Penelitian ini mengonfirmasi bahwa benang X memiliki kualitas unggul dibandingkan benang Y, khususnya dalam kekuatan tarik jahitan. Kontribusi penelitian ini terletak pada penilaian mutu benang berdasarkan pendekatan multidimensi, memberikan referensi bagi industri tekstil dalam pemilihan benang yang sesuai untuk aplikasi spesifik. Penelitian lanjutan diusulkan untuk mengeksplorasi pengaruh variasi parameter jahitan dan kondisi lingkungan terhadap kualitas jahitan.

Pengaruh Variasi Pegas CVT dan Massa Roller terhadap Performa Motor 110 cc

2025-06-13

Rizki Fatahiah , Purwoko Purwoko , Ratna Monasari +1 more | Jurnal Kendali Teknik dan Sains

This study aims to analyze the effect of variations in CVT spring constants (4.94 N/mm, 6.09 N/mm, and 7.38 N/mm) and roller masses (10 g, 13 g, and 15 g) … This study aims to analyze the effect of variations in CVT spring constants (4.94 N/mm, 6.09 N/mm, and 7.38 N/mm) and roller masses (10 g, 13 g, and 15 g) on torque, power, and specific fuel consumption (SFC) of a 110 cc matic motorcycle. Testing was conducted using a dynotest to measure torque and power, and a measuring glass for fuel consumption at engine speeds of 5000–9000 RPM. Results showed a maximum power of 7.93 HP at 7000 RPM with a 10 g roller and 4.94 N/mm spring, the highest torque of 8.56 Nm at 6000 RPM with a 13 g roller and 4.94 N/mm spring, and the lowest SFC of 0.0689 kg/kWh at 9000 RPM with a 10 g roller and 6.09 N/mm spring. Two-Way ANOVA analysis indicated that all factors and their interactions significantly influenced engine performance (p-value < 0.05), with the statistical model showing an R-squared above 97%. The combination of a light roller and medium spring provided the best fuel efficiency, while heavier rollers were more optimal for torque at mid-range RPMs.

Frame design and improvement of a small electric vehicle

2025-06-13

Zhongming Wu , Wenjie Pan , Ruikun Niu +1 more | Mechanical sciences

Abstract. The frame is a crucial component of a small electric vehicle. As the main body that bears the load, it has requirements for strength and deformation, meanwhile avoiding resonance … Abstract. The frame is a crucial component of a small electric vehicle. As the main body that bears the load, it has requirements for strength and deformation, meanwhile avoiding resonance with road excitation. Light-weighting of the frame can reduce vehicle cost while meeting performance requirements. This article designs a type of small electric vehicle frame, uses the CATIA 3D modeling software to model the frame entity, and then uses the ANSYS finite-element software to perform simulation analysis of the frame model, obtaining its deformation and stress conditions under the corresponding working conditions. Under the guarantee of frame safety, adjustments and optimizations of the frame dimensions are carried out, and their rationality is verified through simulation. Finally, the light-weighting of the structural design is achieved while meeting the requirements for strength and rigidity. The results show that the optimized frame meets the safety performance requirements and that the overall deformation and stress distribution are reasonable, ultimately achieving a weight reduction target of 10.7 % and realizing the light-weighting goal of the frame.

Finite Element Modeling of Tractor Tire Composite Structure to Analyze Inflation Pressure Effects on Compression

2025-06-13

Siwakorn Phakdee , Chakrit Suvanjumrat | Materials science forum

Tractors play a crucial role in alleviating the workload of farmers across various agricultural processes, including land preparation, seed sowing, pest control, and harvesting. However, the direct contact of tractor … Tractors play a crucial role in alleviating the workload of farmers across various agricultural processes, including land preparation, seed sowing, pest control, and harvesting. However, the direct contact of tractor tires with the soil often results in soil compaction, which adversely affects soil quality. A common approach to mitigate soil compaction is to lower the inflation pressure of agricultural tires, as this increases the tire's contact area and distributes the load more evenly. Nonetheless, reduced inflation pressure decreases the tire's vertical stiffness, thereby elevating the risk of tire damage. This study investigates the effects of inflation pressure on tractor tires by employing the finite element method (FEM) to model their composite structure. The study utilized a composite finite element (FE) modeling technique, demonstrating high accuracy when compared to experimental tire compression tests. An image processing technique was also applied to validate the tire footprint model. The developed FE model exhibited an average error of 8.62% and was subsequently used to examine the effects of inflation pressure, resulting in the creation of a characteristic chart that provides farmers with practical guidance for maintaining optimal tire pressure to ensure efficient operation in cultivated fields.

EFFECTIVENESS OF DIFFERENT DAMPING PAD GEOMETRIES IN REDUCING VIBRATION

2025-06-13

Nazik Abdulwahid Jebur , Zahra Khalid Hamdan , Zaineb waired Metteb +1 more | Jurnal Teknologi

This study aims to evaluate the effectiveness of different geometric shapes of damping pads in reducing vibrations, focusing on square, rectangular, triangular, and circular shapes. The pads were designed to … This study aims to evaluate the effectiveness of different geometric shapes of damping pads in reducing vibrations, focusing on square, rectangular, triangular, and circular shapes. The pads were designed to have the same surface area, thickness, and materials to ensure a fair comparison. The main objective is to determine the most efficient shape for vibration reduction, especially in applications that require a quiet environment, such as vaporizer devices for asthma patients. Vibration velocity and displacement data were analyzed using MATLAB. The results showed that rectangular pads were the most effective, with a vibration velocity of 6.2 mm/s and a displacement of 0.0496 mm, achieving reduction percentages of 34.7% and 42.99%, respectively. The square shape demonstrated good stability with a vibration velocity of 7 mm/s and a displacement of 0.0565 mm, with reduction percentages of 26.3% and 35.2%. Triangular and circular pads were the least efficient in reducing vibrations. This study indicates that rectangular and square shapes are the most effective in reducing vibrations, making them suitable for applications that require a stable and quiet environment.

Elastic wave manipulation in suspension helical spring: Mechanisms and control strategies for tire acoustic cavity resonance noise mitigation

2025-06-13

Xueman Hu , Yue Bao , Hang Liu +4 more | Mechanical Systems and Signal Processing

Damping Rates of Anti-Vibration Gloves Made of Different Materials

2025-06-12

İlknur EROL | Applied Sciences

The transmission of vibrations generated by high-powered machines to the hands can lead to serious health problems and various work-related difficulties for the operators. These issues result in a loss … The transmission of vibrations generated by high-powered machines to the hands can lead to serious health problems and various work-related difficulties for the operators. These issues result in a loss of workforce and increased operational costs due to compensation payments made to affected workers. Exposure to hand–arm vibration can be controlled through the use of vibration damping gloves. In this study, the hand–arm vibration exposure of operators using a jackhammer in three different mines was measured with and without gloves, and the vibration damping ratio of each glove was calculated. One-way analysis of variance was performed to determine the difference between the vibration damping ratios (%) obtained from three separate field measurements of 12 different gloves, and significant differences were detected. In addition, vibration exposure was measured with and without gloves for operators using a vibrating sieve set with standard vibration in a laboratory environment. From both the field and laboratory measurements, the gloves made of chloroprene rubber provide the most effective protection.

Optimal Design of TPMS-Based Non-Pneumatic Tire Spoke with Adaptive Directional Stiffness

2025-06-12

S.J. Kim , K.-H. Lee , Seo-Hyeon Oh +2 more | International Journal of Precision Engineering and Manufacturing-Green Technology

Springing and whipping

2025-06-12

Heinrich Söding | Ship Technology Research

Structural Modeling and Analysis of Flat Wagon Underframe Based on Finite Element Method

2025-06-10

Ilham Satrio Utomo , Edi Nyoto Marsusiadi , S. Wibowo | Journal of Railway Transportation and Technology

This research analyzes the structural strength of the 50-foot Flat Wagon underframe using the finite element method. Modeling was done in Autodesk Inventor and load simulation using ANSYS Workbench with … This research analyzes the structural strength of the 50-foot Flat Wagon underframe using the finite element method. Modeling was done in Autodesk Inventor and load simulation using ANSYS Workbench with a mesh size of 25 mm. The analysis refers to the UIC 571-4 and EN 12663 standards. The results showed that the maximum stress of 347.56 MPa and maximum deformation of 15.305 mm occurred under combined loading. This value is still below the yield strength of the material (355 MPa), but exceeds 75% of the allowable stress according to KM No. 43 Year 2010 (266.25 MPa). The highest safety factor is 1.82 (compression loading), the lowest is 0.76 (combination loading). This simulation shows the need for design optimization to meet national safety standards..