WSEAS Transactions on Applied and Theoretical Mechanics最新文献

Reduction of Input Torque and Joint Reactions in High-Speed Mechanical Systems with Reciprocating Motion 减少带往复运动的高速机械系统中的输入扭矩和关节反作用力

WSEAS Transactions on Applied and Theoretical Mechanics Pub Date : 2024-07-24 DOI: 10.37394/232011.2024.19.10

Vigen Arakelian

{"title":"Reduction of Input Torque and Joint Reactions in High-Speed Mechanical Systems with Reciprocating Motion","authors":"Vigen Arakelian","doi":"10.37394/232011.2024.19.10","DOIUrl":"https://doi.org/10.37394/232011.2024.19.10","url":null,"abstract":"In high-speed machinery, the variable inertia forces generated by reciprocating masses often introduce undesirable effects, such as a significant increase in the required input torque and joint forces. This paper addresses the challenge of reducing input torque and joint reaction forces in such mechanisms by employing two compression linear springs positioned between the slider and the frame. These springs counterbalance the slider's inertia force, thereby diminishing both the input torque and joint reactions. It is important to note that the elastic forces exerted by these springs remain internal to the mechanical system, preserving the balance of shaking forces and moments of the mechanism on the frame. The analytical framework developed in this study focuses on minimizing the root mean square and maximum values of the inertia force effects. A significant scientific achievement is attaining a given goal through an analytical solution. Notably, this is the first instance where this problem has been formulated and solved using explicit expressions. The effectiveness of the proposed technique is also demonstrated through CAD simulations, showing a substantial reduction in input torque and joint reactions.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":"80 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141808053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling the Normal Contact Characteristics between Components Joined in Multi-Bolted Systems 多螺栓系统中连接部件之间的法向接触特性建模

WSEAS Transactions on Applied and Theoretical Mechanics Pub Date : 2024-05-20 DOI: 10.37394/232011.2024.19.8

R. Grzejda

引用次数: 0

Structural Investigation of Drini River Bridges, Case Study of Structures Analyses 德里尼河大桥结构调查，结构分析案例研究

WSEAS Transactions on Applied and Theoretical Mechanics Pub Date : 2024-05-16 DOI: 10.37394/232011.2024.19.7

Iralda Xhaferaj

引用次数: 0

Stability of Beam Bridges Under Bridge-Vehicle Interaction 桥梁与车辆相互作用下梁桥的稳定性

WSEAS Transactions on Applied and Theoretical Mechanics Pub Date : 2024-05-13 DOI: 10.37394/232011.2024.19.6

Ayoub El Amrani, Hafid Mataich, B. El Amrani

{"title":"Stability of Beam Bridges Under Bridge-Vehicle Interaction","authors":"Ayoub El Amrani, Hafid Mataich, B. El Amrani","doi":"10.37394/232011.2024.19.6","DOIUrl":"https://doi.org/10.37394/232011.2024.19.6","url":null,"abstract":"In this paper, we provide an accurate and reliable formulation for simulating the interactions of both train/bridge subsystems and suitable for high-speed railway lines as well as for existing lines worldwide that are being renewed or modernized. We model the train as a series of suspended masses, taking into account the energy dissipation and the suspension system for each train vehicle. On the other hand, the bridge supporting the rails with irregular elevations will be modeled as an Euler-Bernoulli beam. The mathematical formulation of the interaction problem between the two subsystems requires the writing of two sets of equations, which interact with each other through contact forces. Using a one-dimensional finite element formulation, a series of equations are constructed by Modeling the beam structure. In addition, the suspended mass equations are first discretized using Newmark's finite difference formulas, which then reduce the degrees of freedom (DOF) of the vehicle to those of the bridge element. This solves the coupling problem between the two subsystems. The derived component is known as the vehicle/bridge interaction (VBI) element. On the other hand, an iterative procedure will be used subsequently to solve the non-linearity problem of the resulting system of differential equations. MATLAB programs provide results that identify the critical parameters influencing the bridge's dynamic stability.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":"39 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140983813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Earthquake-Induced Structural Pounding on the Floor Accelerations and Floor Response Spectra of Adjacent Building Structures 地震引发的结构冲击对相邻建筑结构的楼层加速度和楼层响应谱的影响

WSEAS Transactions on Applied and Theoretical Mechanics Pub Date : 2024-04-23 DOI: 10.37394/232011.2024.19.4

Pedro L. P. Folhento, Rui Carneiro De Barros, M. Braz-César

{"title":"Effect of Earthquake-Induced Structural Pounding on the Floor Accelerations and Floor Response Spectra of Adjacent Building Structures","authors":"Pedro L. P. Folhento, Rui Carneiro De Barros, M. Braz-César","doi":"10.37394/232011.2024.19.4","DOIUrl":"https://doi.org/10.37394/232011.2024.19.4","url":null,"abstract":"The influence of earthquake-induced structural pounding among buildings is paramount in the seismic analysis and design of structures. The recognition of such a phenomenon has been growing in the last decades. The search for ways to understand and mitigate the consequences of these structural collisions in building structures is the primary goal of the investigation of earthquake-induced building pounding. This phenomenon is known for increasing the floor accelerations, mainly where pounding occurs, implying significant local damage. These collisions cause short-duration acceleration pulses that may compromise the building structure and the non-structural elements within the building’s stories. Non-structural elements supported by the structure’s floors under earthquake-induced pounding instances may present a risk to human lives and/or human activity. Hence, the influence of earthquake-induced pounding in the floor response spectra of two adjacent reinforced concrete structures with inelastic behavior is assessed by varying the number of stories and their separation distance. Pounding greatly influenced the floor acceleration spectra, increasing the spread of accelerations over a broader period range, particularly exciting low to moderate periods of vibration.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":"142 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140668395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Calculation of Rayleigh Damping Coefficients for a Transient Structural Analysis 瞬态结构分析的瑞利阻尼系数计算

WSEAS Transactions on Applied and Theoretical Mechanics Pub Date : 2024-04-23 DOI: 10.37394/232011.2024.19.5

Andrey Grishin, V. Geraschenko

{"title":"Calculation of Rayleigh Damping Coefficients for a Transient Structural Analysis","authors":"Andrey Grishin, V. Geraschenko","doi":"10.37394/232011.2024.19.5","DOIUrl":"https://doi.org/10.37394/232011.2024.19.5","url":null,"abstract":"Direct numerical integration of differential equations of motion is widely used by engineers to describe the behavior of structures under dynamic loading. The method entails directly integrating the motion equations over time. In the direct method, the damping matrix is formed as a linear combination of mass and stiffness matrices multiplied by the Rayleigh damping coefficients α and β, respectively. The Rayleigh damping coefficients have a significant effect on the response of building structures under dynamic loading. Therefore, the design values of the damping coefficients α and β have crucial importance to ensure accurate and reliable results in a dynamic analysis. The paper presents a time domain analysis for a building subjected to seismic excitations using the modal superposition and direct integration methods. The direct method considers the damping properties of building structures by Rayleigh damping coefficients obtained using various approaches. The building's response to seismic load is compared by response spectra. The authors proposed the least conservative approach for calculating the Rayleigh damping coefficients for analyzing a building in the time domain.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":"38 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140670929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Higher Order Generalized Thermoelastic Model with Memory Responses in Nonhomogeneous Elastic Medium due to Laser Pulse 激光脉冲导致非均质弹性介质中具有记忆响应的高阶广义热弹性模型

WSEAS Transactions on Applied and Theoretical Mechanics Pub Date : 2024-04-17 DOI: 10.37394/232011.2024.19.3

Soumen Shaw, Aktar Seikh

引用次数: 0

Numerical Analysis of Unsteady Vibrations of a Plate Resting on an Elastic Isotropic Half-Space 弹性各向同性半空间上静止板的非稳态振动数值分析

WSEAS Transactions on Applied and Theoretical Mechanics Pub Date : 2024-04-03 DOI: 10.37394/232011.2024.19.2

M. Shitikova, Anna S. Bespalova

{"title":"Numerical Analysis of Unsteady Vibrations of a Plate Resting on an Elastic Isotropic Half-Space","authors":"M. Shitikova, Anna S. Bespalova","doi":"10.37394/232011.2024.19.2","DOIUrl":"https://doi.org/10.37394/232011.2024.19.2","url":null,"abstract":"The paper is devoted to the numerical solution of the problem of vibrations of an infinite elastic plate resting on an elastic isotropic half-space using the analytical method based on the ray method with its numerical realization via the Maplesoft package. Unsteady oscillations are caused by the action of instantaneous loads on the plate, resulting in the appearance of two plane wave surfaces of strong discontinuity in the elastic half-space, behind the fronts of which, up to the contact boundary, the solution is constructed using ray series. The unknown functions entering the coefficients of the ray series and the equation of plate motion are determined from the boundary conditions of the contact interaction between the plate and the half-space. Previously, the approximate solution of this problem was obtained analytically without using mathematical packages, and the dynamic deflection of the plate involving only the first three terms of the ray series was written down. In this work, a two-layer medium with different properties was investigated using an algorithm developed to solve contact dynamic problems related to the occurrence and propagation of strong and weak discontinuity surfaces.","PeriodicalId":53603,"journal":{"name":"WSEAS Transactions on Applied and Theoretical Mechanics","volume":"779 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140749027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of a Two-stage Bevel Helical Gearbox using Multiple Objectives to Increase Efficiency and Reduce Gearbox Bottom Area 利用多目标优化双级螺旋锥齿轮转向箱，以提高效率并减少转向箱底部面积

WSEAS Transactions on Applied and Theoretical Mechanics Pub Date : 2024-01-16 DOI: 10.37394/232011.2024.19.1

Tran Huu Danh, Dinh Van Thanh, Bui Thanh Danh, Nguyen Manh Cuong, Luu Anh Tung

引用次数: 0

Research on Adapting Sanitizing Robots in Stock Farms Hygiene 关于在畜牧场卫生中应用消毒机器人的研究

WSEAS Transactions on Applied and Theoretical Mechanics Pub Date : 2023-12-07 DOI: 10.37394/232011.2023.18.26

V. Yosifova, Nikolay Stoimenov

引用次数: 0