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{"title":"Parametrization of the main rotor and working environment for different flight conditions – Computational Fluid Dynamics analysis as an application for multidisciplinary optimization","authors":"Jakub Kocjan, Stanisław Kachel, Robert Rogólski","doi":"10.15632/jtam-pl/171748","DOIUrl":"https://doi.org/10.15632/jtam-pl/171748","url":null,"abstract":"1. Allen L.D., Lim J.W., Haehnel R.B., Dettwiller I.D., 2021, Rotor Blade Design Framework for Airfoil Shape Optimization with Performance Considerations, Engineer Research and Development Center. CrossRef Google Scholar","PeriodicalId":49980,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135407391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
1. Asami T., 2019, Exact algebraic solution of an optimal double-mass dynamic vibration absorber attached to a damped primary system, Journal of Vibration and Acoustics, 141, 5, 051013. CrossRef Google Scholar
{"title":"Self-synchronization of drive vibrators of an antiresonance vibratory conveyor","authors":"Grzegorz Cieplok","doi":"10.15632/jtam-pl/170840","DOIUrl":"https://doi.org/10.15632/jtam-pl/170840","url":null,"abstract":"1. Asami T., 2019, Exact algebraic solution of an optimal double-mass dynamic vibration absorber attached to a damped primary system, Journal of Vibration and Acoustics, 141, 5, 051013. CrossRef Google Scholar","PeriodicalId":49980,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135110210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chaoming Shen, Yang Chen, Lei Liu, Zexin Zhang, Baijian Tang, Fushan Li, Denghui Qian
1. Chen L., Du T., Xiao X., et al., 2019, Experimental and numerical simulation of 7075 aluminum target impacted with ogival-nosed projectiles, Ordnance Materials Science and Engineering, 42, 5, 27-32. Google Scholar
{"title":"Investigation on the anti-penetration performance of UD - three-dimensional orthogonal woven fabric composite reinforced structure","authors":"Chaoming Shen, Yang Chen, Lei Liu, Zexin Zhang, Baijian Tang, Fushan Li, Denghui Qian","doi":"10.15632/jtam-pl/170712","DOIUrl":"https://doi.org/10.15632/jtam-pl/170712","url":null,"abstract":"1. Chen L., Du T., Xiao X., et al., 2019, Experimental and numerical simulation of 7075 aluminum target impacted with ogival-nosed projectiles, Ordnance Materials Science and Engineering, 42, 5, 27-32. Google Scholar","PeriodicalId":49980,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135153947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
1. Abramov N., Goman M., Khrabrov A., 2004, Aircraft dynamics at high incidence flight with account of unsteady aerodynamic effects, AIAA Atmospheric Flight Mechanics Conference and Exhibit, 5274. CrossRef Google Scholar
{"title":"Analysis of an aircraft departure and spin characteristics using Nash equilibrium theory","authors":"Chao Yan, Lianghui Tu, Yang Yang, Yuhao Wang","doi":"10.15632/jtam-pl/170721","DOIUrl":"https://doi.org/10.15632/jtam-pl/170721","url":null,"abstract":"1. Abramov N., Goman M., Khrabrov A., 2004, Aircraft dynamics at high incidence flight with account of unsteady aerodynamic effects, AIAA Atmospheric Flight Mechanics Conference and Exhibit, 5274. CrossRef Google Scholar","PeriodicalId":49980,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135436703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuanyuan Gao, Nkosilathi Lovewell Hlupo, Quan Qian, Hongtao Jiang
1. Abdelrahman A.A., Esen I., Özarpa C., Eltaher M.A., 2021, Dynamics of perforated nanobeams subject to moving mass using the nonlocal strain gradient theory, Applied Mathematical Modelling, 96, 215-235. CrossRef Google Scholar
{"title":"Mechanical performance of asphalt pavement with orthotropic unbound granular sub-base under vehicle load","authors":"Yuanyuan Gao, Nkosilathi Lovewell Hlupo, Quan Qian, Hongtao Jiang","doi":"10.15632/jtam-pl/170854","DOIUrl":"https://doi.org/10.15632/jtam-pl/170854","url":null,"abstract":"1. Abdelrahman A.A., Esen I., Özarpa C., Eltaher M.A., 2021, Dynamics of perforated nanobeams subject to moving mass using the nonlocal strain gradient theory, Applied Mathematical Modelling, 96, 215-235. CrossRef Google Scholar","PeriodicalId":49980,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135396133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
There is limited research available on the effect of asymmetric structure on the performance of the prosthesis. In this paper, 12 sets of prosthetic feet with asymmetric structures were developed using a planar polar coordinate system. The effect of asymmetry on the prosthesis performance was investigated. The prosthetic feet with asymmetric structures were modeled in a gradient manner within a polar coordinate system. A finite element (FE) model of the prosthetic walking process was formulated, and dynamic simulations were conducted to simulate the loading of the prosthesis during the support phase. Evaluation indices such as energy characteristics, contact pressure and roll-over shape were selected to investigate the effects of the asymmetric structure. The results indicate that θ 1 and θ 3 asymmetry significantly affects strain energy density. Moreover, incorporating heel asymmetry proves to be more advantageous in reducing contact pressure of the prosthesis during the middle stance moment. The optimal parameters for asymmetric prostheses are determined based on these findings.
{"title":"Numerical study of the effects of prosthesis foot asymmetry on energy characters and roll-over characteristics","authors":"Meijiao Jiang, Junxia Zhang","doi":"10.15632/jtam-pl/170243","DOIUrl":"https://doi.org/10.15632/jtam-pl/170243","url":null,"abstract":"There is limited research available on the effect of asymmetric structure on the performance of the prosthesis. In this paper, 12 sets of prosthetic feet with asymmetric structures were developed using a planar polar coordinate system. The effect of asymmetry on the prosthesis performance was investigated. The prosthetic feet with asymmetric structures were modeled in a gradient manner within a polar coordinate system. A finite element (FE) model of the prosthetic walking process was formulated, and dynamic simulations were conducted to simulate the loading of the prosthesis during the support phase. Evaluation indices such as energy characteristics, contact pressure and roll-over shape were selected to investigate the effects of the asymmetric structure. The results indicate that θ 1 and θ 3 asymmetry significantly affects strain energy density. Moreover, incorporating heel asymmetry proves to be more advantageous in reducing contact pressure of the prosthesis during the middle stance moment. The optimal parameters for asymmetric prostheses are determined based on these findings.","PeriodicalId":49980,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":"60 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83755730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study extends the traditional problem of a seismic response of elastic foundations under isothermal conditions when considering thermal effects. Firstly, a free-field model of the elastic foundation is established under the incidence of plane P -waves. Then, utilizing the principles of wave propagation in a homogeneous and isotropic thermoelastic medium and the principle of Helmholtz vector decomposition, the influence of thermal physical parameters such as thermal conductivity, medium temperature on seismic ground motion of the free--field on elastic foundation is investigated, which provides a reasonable explanation for the ground motion of a site under thermal effects.
{"title":"Study on seismic ground motion of P-wave incident elastic foundation free field under thermal effect","authors":"Yiqi Yang, Q. Ma","doi":"10.15632/jtam-pl/170730","DOIUrl":"https://doi.org/10.15632/jtam-pl/170730","url":null,"abstract":"This study extends the traditional problem of a seismic response of elastic foundations under isothermal conditions when considering thermal effects. Firstly, a free-field model of the elastic foundation is established under the incidence of plane P -waves. Then, utilizing the principles of wave propagation in a homogeneous and isotropic thermoelastic medium and the principle of Helmholtz vector decomposition, the influence of thermal physical parameters such as thermal conductivity, medium temperature on seismic ground motion of the free--field on elastic foundation is investigated, which provides a reasonable explanation for the ground motion of a site under thermal effects.","PeriodicalId":49980,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":"25 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74849614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper deals with the stability of a spinning shaft in a concentric cylinder filled with an incompressible fluid. The steady-state momentum and continuity equations for the ex-ternal fluid are established. Using Taylor expansion, the fluid forces exerted on the shaft are calculated. The shaft is in the Rayleigh model taking into account the rotary inertia and gyroscopic effects. Accordingly, the governing equation of the considered system is formulated analytically. The explicit characteristic frequency equation for the pinned-pinned spinning shaft system is then derived. Finally, the stability of the system is studied by means of characteristic value analysis.
{"title":"Stability analysis of a spinning shaft in the concentric cylinder filled with an incompressible fluid","authors":"Zhongkai Jiang, Guangding Wang, Huiqun Yuan","doi":"10.15632/jtam-pl/170706","DOIUrl":"https://doi.org/10.15632/jtam-pl/170706","url":null,"abstract":"This paper deals with the stability of a spinning shaft in a concentric cylinder filled with an incompressible fluid. The steady-state momentum and continuity equations for the ex-ternal fluid are established. Using Taylor expansion, the fluid forces exerted on the shaft are calculated. The shaft is in the Rayleigh model taking into account the rotary inertia and gyroscopic effects. Accordingly, the governing equation of the considered system is formulated analytically. The explicit characteristic frequency equation for the pinned-pinned spinning shaft system is then derived. Finally, the stability of the system is studied by means of characteristic value analysis.","PeriodicalId":49980,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":"193 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75855619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-18DOI: 10.55787/jtams.23.53.3.270
M. A. A. R. Ydalevskaya, Y. U. N. V. Oroshilova
A BSTRACT : In this work, the influence of interactions between multi-comp-onent plasma systems on their equilibrium compositions is studied. Equilibrium densities of atoms, ions and free electrons in these systems are determined by integration of distribution functions over the space of momentum and summation over electronic energy levels. These functions correspond to the maximum entropy for the combination of systems under different conditions of their interaction. Special attention is given to monatomic plasma mixtures under following situations: 1) the systems may exchange only energy; 2) the systems may exchange energy and electrons; 3) the systems may exchange energy, electrons and some chemical elements.
{"title":"CONTACT EQUILIBRIUM OF PLASMA SYSTEMS UNDER DIFFERENT ISOLATION CONDITIONS","authors":"M. A. A. R. Ydalevskaya, Y. U. N. V. Oroshilova","doi":"10.55787/jtams.23.53.3.270","DOIUrl":"https://doi.org/10.55787/jtams.23.53.3.270","url":null,"abstract":"A BSTRACT : In this work, the influence of interactions between multi-comp-onent plasma systems on their equilibrium compositions is studied. Equilibrium densities of atoms, ions and free electrons in these systems are determined by integration of distribution functions over the space of momentum and summation over electronic energy levels. These functions correspond to the maximum entropy for the combination of systems under different conditions of their interaction. Special attention is given to monatomic plasma mixtures under following situations: 1) the systems may exchange only energy; 2) the systems may exchange energy and electrons; 3) the systems may exchange energy, electrons and some chemical elements.","PeriodicalId":49980,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":"73 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84110205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-18DOI: 10.55787/jtams.23.53.3.296
A. Liolios, A. Liolios
A BSTRACT : The Civil Engineering structural mechanics praxis includes framed buildings of reinforced concrete (RC). The present study deals with a stochastic numerical treatment for the pounding problem concerning the seismic interaction between adjacent RC framed structures strengthened by cable-ties when the input parameters are uncertain-but-bounded. This problem concerns here the unilateral contact between neighbouring RC structures during earthquakes and is considered as an inequality problem of dynamic structural contact mechanics. The Monte Carlo method is used for treating the uncertainty concerning input parameters. The purpose here is to estimate numerically and to control actively the influence of the cable-ties on the seismic response of the adjacent structures. Finally, in a practical case of two seismically interacting framed RC structures, the effectiveness of the proposed methodology is shown.
{"title":"A STOCHASTIC APPROACH FOR POUNDING EFFECTS ON THE SEISMIC RESPONSE UNDER UNCERTAINTY OF ADJACENT STRUCTURES STRENGTHENED BY CABLE-TIES","authors":"A. Liolios, A. Liolios","doi":"10.55787/jtams.23.53.3.296","DOIUrl":"https://doi.org/10.55787/jtams.23.53.3.296","url":null,"abstract":"A BSTRACT : The Civil Engineering structural mechanics praxis includes framed buildings of reinforced concrete (RC). The present study deals with a stochastic numerical treatment for the pounding problem concerning the seismic interaction between adjacent RC framed structures strengthened by cable-ties when the input parameters are uncertain-but-bounded. This problem concerns here the unilateral contact between neighbouring RC structures during earthquakes and is considered as an inequality problem of dynamic structural contact mechanics. The Monte Carlo method is used for treating the uncertainty concerning input parameters. The purpose here is to estimate numerically and to control actively the influence of the cable-ties on the seismic response of the adjacent structures. Finally, in a practical case of two seismically interacting framed RC structures, the effectiveness of the proposed methodology is shown.","PeriodicalId":49980,"journal":{"name":"Journal of Theoretical and Applied Mechanics","volume":"8 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74839402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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