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Journal of Theoretical and Applied Mechanics最新文献

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Study of a horizontal seat suspension with a model of the seated human body and energy recovery braking subsystem 带有人体坐姿模型和能量回收制动子系统的水平座椅悬架研究
Journal of Theoretical and Applied Mechanics Pub Date : 2024-03-26 DOI: 10.15632/jtam-pl/186041
I. Maciejewski, Sebastian Pecolt, A. Błażejewski, Bartosz Jereczek, T. Krzyżyński
{"title":"Study of a horizontal seat suspension with a model of the seated human body and energy recovery braking subsystem","authors":"I. Maciejewski, Sebastian Pecolt, A. Błażejewski, Bartosz Jereczek, T. Krzyżyński","doi":"10.15632/jtam-pl/186041","DOIUrl":"https://doi.org/10.15632/jtam-pl/186041","url":null,"abstract":"This article explains the mechanics, control strategies and main applications of a new concept which achieves a balance between energy saving and driver comfort. A physical and mathematical model of a suspension system with energy recovery is presented. It shows practical implementation of the BLDC braking system with energy recovery in a horizontal seat suspension and a detailed simulation analysis of their features and performance. The research involves a specific solution, with a specific BLDC motor, and experimental tests on a laboratory stand. The results of the simulation study using a simplified biomechanical model and experimental studies with human participation are presented.","PeriodicalId":503677,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140379205","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
Dynamic response of a guy line of a guyed tower to stochastic wind excitation: 3D non-linear small-sag cable model 塔架缆索对随机风激励的动态响应：三维非线性小下垂缆索模型
Journal of Theoretical and Applied Mechanics Pub Date : 2024-03-21 DOI: 10.15632/jtam-pl/184322
Hanna Weber, A. Jabłonka, R. Iwankiewicz
{"title":"Dynamic response of a guy line of a guyed tower to stochastic wind excitation: 3D non-linear small-sag cable model","authors":"Hanna Weber, A. Jabłonka, R. Iwankiewicz","doi":"10.15632/jtam-pl/184322","DOIUrl":"https://doi.org/10.15632/jtam-pl/184322","url":null,"abstract":"In the proposed approach, a 3D response of the guy line treated as a small-sag cable is considered. The strong dynamic wind action leads to the base motion excitation of the guy line. Longitudinal cable displacements are coupled with lateral ones. Hamilton’s principle and Galerkin method are used to obtain the set of differential equations of motion. The cable excitation is assumed as a narrow-band stochastic process modelled as a response of an auxiliary linear filter to a Gaussian white noise process. The equivalent linearization technique is applied to obtain approximate analytical results verified against the numerical Monte Carlo simulation.","PeriodicalId":503677,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140221814","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
Internal heat sources in large strain thermo-elasto-plasticity – theory and finite element simulations 大应变热弹性塑性中的内部热源--理论和有限元模拟
Journal of Theoretical and Applied Mechanics Pub Date : 2024-03-17 DOI: 10.15632/jtam-pl/185614
B. Wcisło, M. Mucha, J. Pamin
{"title":"Internal heat sources in large strain thermo-elasto-plasticity – theory and finite element simulations","authors":"B. Wcisło, M. Mucha, J. Pamin","doi":"10.15632/jtam-pl/185614","DOIUrl":"https://doi.org/10.15632/jtam-pl/185614","url":null,"abstract":"The paper deals with theoretical description and numerical simulations of internal sources of heating/cooling in large strain thermo-elasticity and thermo-elasto-plasticity. The attention is paid to metallic materials which undergo cooling in the elastic range and heating during plastic yielding. Theoretical description can be derived from thermodynamic considerations based on the first and second laws of thermodynamics and assumed forms of the Helmholtz free energy. Numerical simulations within the Finite Element Method are performed for a uniaxial tension test and elongation of a dogbone-shape sample. For the latter specimen, a comparison with experimental results is performed, and good agreement is obtained.","PeriodicalId":503677,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140234752","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
Parametric dynamic analysis of tensegrity cable-strut domes 拉索支撑穹顶的参数动态分析
Journal of Theoretical and Applied Mechanics Pub Date : 2024-03-14 DOI: 10.15632/jtam-pl/183833
Paulina Obara, Maryna Solovei, Justyna Tomasik
{"title":"Parametric dynamic analysis of tensegrity cable-strut domes","authors":"Paulina Obara, Maryna Solovei, Justyna Tomasik","doi":"10.15632/jtam-pl/183833","DOIUrl":"https://doi.org/10.15632/jtam-pl/183833","url":null,"abstract":"The paper contains a parametric dynamic analysis of cable-strut domes. The special structures named tensegrity are considered. Two qualitative different tensegrity domes, i.e., the Geiger dome and the Levy dome are taken into account. The aim of the study is to compare the dynamic behaviour of such structures. The first stage of analysis involves the identification of initial prestress forces (system of internal forces, which holds structural components in stable equilibrium) and infinitesimal mechanisms. The second stage focuses on calculating natural frequencies, while in the last, the impact of time-independent external loads on vibrations is studied. The influence of initial prestress and external load on the dynamic response of the structures is considered. A geometrically non-linear model is used to analysis. Presented considerations are crucial for the next step in the analysis, i.e., dynamic stability analysis of the behaviour of tensegrity structures under periodic loads.","PeriodicalId":503677,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140244045","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
The probabilistic model for system reliability analysis of a steel plane and spatial trusses 钢平面和空间桁架系统可靠性分析概率模型
Journal of Theoretical and Applied Mechanics Pub Date : 2024-03-14 DOI: 10.15632/jtam-pl/184262
Katarzyna Kubicka
{"title":"The probabilistic model for system reliability analysis of a steel plane and spatial trusses","authors":"Katarzyna Kubicka","doi":"10.15632/jtam-pl/184262","DOIUrl":"https://doi.org/10.15632/jtam-pl/184262","url":null,"abstract":"The article focuses on the system reliability analysis of steel trusses (plane and spatial). The computations are realized by the use of a developed by the author C++ code. The following loads are taken into account: self-weight, weight of coverings, wind and snow. The limit state function is defined as a difference between the bearing capacity and the effect of action of an element. The paper presents how effective tool is the system reliability analysis compared with traditional structural design methods. The methods of transforming Gumbel distribution into normal and generating random variables are described.","PeriodicalId":503677,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140241520","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
VIBRATION OF ORTHOTROPIC RECTANGULAR PLATE WITH 2D CIRCULAR THICKNESS AND LINEAR DENSITY 厚度为 2d 圆形、密度为线性的正交矩形板的振动
Journal of Theoretical and Applied Mechanics Pub Date : 2024-03-12 DOI: 10.55787/jtams.24.54.1.124
{"title":"VIBRATION OF ORTHOTROPIC RECTANGULAR PLATE WITH 2D CIRCULAR THICKNESS AND LINEAR DENSITY","authors":"","doi":"10.55787/jtams.24.54.1.124","DOIUrl":"https://doi.org/10.55787/jtams.24.54.1.124","url":null,"abstract":"","PeriodicalId":503677,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140249096","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
FLOW AND STABILITY OF THREE-DIMENSIONAL ROTATING VISCOELASTIC JET 三维旋转粘弹性射流的流动与稳定性
Journal of Theoretical and Applied Mechanics Pub Date : 2024-03-12 DOI: 10.55787/jtams.24.54.1.027
{"title":"FLOW AND STABILITY OF THREE-DIMENSIONAL ROTATING VISCOELASTIC JET","authors":"","doi":"10.55787/jtams.24.54.1.027","DOIUrl":"https://doi.org/10.55787/jtams.24.54.1.027","url":null,"abstract":"","PeriodicalId":503677,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140251211","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
INVESTIGATION OF THE SPATIAL DEFORMATIONS AND TRANSVERSE VIBRATIONS IN MAIN LINKS OF BIG BAND SAW MACHINES 大带锯床主要链节的空间变形和横向振动研究
Journal of Theoretical and Applied Mechanics Pub Date : 2024-03-12 DOI: 10.55787/jtams.24.54.1.073
{"title":"INVESTIGATION OF THE SPATIAL DEFORMATIONS AND TRANSVERSE VIBRATIONS IN MAIN LINKS OF BIG BAND SAW MACHINES","authors":"","doi":"10.55787/jtams.24.54.1.073","DOIUrl":"https://doi.org/10.55787/jtams.24.54.1.073","url":null,"abstract":"","PeriodicalId":503677,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140248972","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
DETERMINATION OF THE MODERN SINGLE SHAFT GAS TURBINE ROTOR THERMAL STRESSES 现代单轴燃气轮机转子热应力的测定
Journal of Theoretical and Applied Mechanics Pub Date : 2024-03-12 DOI: 10.55787/jtams.24.54.1.046
S. E. M. Orhun
{"title":"DETERMINATION OF THE MODERN SINGLE SHAFT GAS TURBINE ROTOR THERMAL STRESSES","authors":"S. E. M. Orhun","doi":"10.55787/jtams.24.54.1.046","DOIUrl":"https://doi.org/10.55787/jtams.24.54.1.046","url":null,"abstract":"A BSTRACT : The paper outlines a finite elements refined mathematical model of the thermal state of modern single shaft gas turbine engine that can be used in ground or floating power plants. The mathematical model is based on special finite elements of hexagonal type. On the base of the developed mathematical model the turbine rotor temperature field was found and experimentally veri-fied. Using the results of temperature field calculation the rotor thermal deformations and stresses have been found too. The obtained results could be used in further studies of the turbine rotor stress-strain state and fatigue strength.","PeriodicalId":503677,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140249168","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
MICROSTRUCTURAL ANALYSIS OF 40X STEEL AFTER STRAIN-CONTROLLED FATIGUE 应变控制疲劳后 40x 钢的微观结构分析
Journal of Theoretical and Applied Mechanics Pub Date : 2024-03-12 DOI: 10.55787/jtams.24.54.1.061
{"title":"MICROSTRUCTURAL ANALYSIS OF 40X STEEL AFTER STRAIN-CONTROLLED FATIGUE","authors":"","doi":"10.55787/jtams.24.54.1.061","DOIUrl":"https://doi.org/10.55787/jtams.24.54.1.061","url":null,"abstract":"","PeriodicalId":503677,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140250148","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
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