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Analysis of multi constant current flowmeter heated elements 多恒流流量计加热元件分析
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2022-01-01 DOI: 10.21495/51-2-357
J. Sedlácek, L. Hurda, J. Mracek
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引用次数: 0
Analysis of vibration of rotors with a thick rigid disc on the overhanging end supported by hydrodynamic bearings and loaded by uncertain unbalance effects 受不确定不平衡作用载荷的悬端厚刚性盘转子振动分析
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2022-01-01 DOI: 10.21495/51-2-409
Prof. Ing. Jaroslav Zapoměl, PhD. Ing. Petr Ferfecki, Ing. Michal Molčan, CSc. Ing. Jan Kozánek
{"title":"Analysis of vibration of rotors with a thick rigid disc on the overhanging end supported by hydrodynamic bearings and loaded by uncertain unbalance effects","authors":"Prof. Ing. Jaroslav Zapoměl, PhD. Ing. Petr Ferfecki, Ing. Michal Molčan, CSc. Ing. Jan Kozánek","doi":"10.21495/51-2-409","DOIUrl":"https://doi.org/10.21495/51-2-409","url":null,"abstract":": Rotors of some rotating machines consist of a shaft and a rigid disc attached to its overhanging end. Because of manufacturing and assembling inaccuracies, the disc is unbalanced. In general case, the disc principal axis of inertia deviates from the shaft axis (both axes are skew lines) and the disc center of gravity is not situated on the shaft center line. Then the disc inertia effects are the source inducing the rotor lateral vibration. As magnitude of parameters specifying the disc unbalance is uncertain, application of an adequate method is required to perform the analysis. In addition, if the rotor is supported by hydrodynamic bearings, their nonlinear properties lead to rising complexity of the system vibration and to reducing its predictability. In the presented paper, the motion equation of a rigid disc has been derived. The shaft was represented by a beam body that was discretized into finite elements. The stiffness and damping parameters of the hydrodynamic bearings were linearized in vicinity of the rotor equilibrium position. Then vibration of the rotor is governed by a set of linearized motion equations. The fuzzy numbers were applied to consider uncertainty of the disc unbalance parameters. The presented procedure provides the approach to computational analysis of rotating machines with the rotor having a disc attached to its overhanging end and the geometrical, mechanical, or technological parameters of which have uncertain values.","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68707610","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
Analytical and numerical analysis of thermal structure 热结构的解析和数值分析
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2022-01-01 DOI: 10.21495/51-2-61
J. Cernoch, J. Mašek, F. Löffelmann
{"title":"Analytical and numerical analysis of thermal structure","authors":"J. Cernoch, J. Mašek, F. Löffelmann","doi":"10.21495/51-2-61","DOIUrl":"https://doi.org/10.21495/51-2-61","url":null,"abstract":"","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68707833","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
Stability of beams under force F in middle of span combined with end moments Ma and Mb 梁在跨中F力及端弯矩Ma和Mb作用下的稳定性
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2022-01-01 DOI: 10.21495/51-2-21
I. Baláž, Y. Koleková, D. Partov
{"title":"Stability of beams under force F in middle of span combined with end moments Ma and Mb","authors":"I. Baláž, Y. Koleková, D. Partov","doi":"10.21495/51-2-21","DOIUrl":"https://doi.org/10.21495/51-2-21","url":null,"abstract":"","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68704998","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
Cable-net systems supporting glass facades 支撑玻璃幕墙的电缆网系统
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2022-01-01 DOI: 10.21495/51-2-205
V. Komlev, J. Machacek
{"title":"Cable-net systems supporting glass facades","authors":"V. Komlev, J. Machacek","doi":"10.21495/51-2-205","DOIUrl":"https://doi.org/10.21495/51-2-205","url":null,"abstract":": Prestressed cable-nets supporting large glass facades are increasingly used for unique structures and studied both experimentally and numerically. Presented paper deals with numerical geometrically nonlinear analysis of planar and double curved cable-nets without and with glass panes attached to the net with clamped fittings. The numerical model established in ANSYS is described and fully validated by published tests (Yussof, 2015). The results confirm the need for taking the glass stiffness into account. It is proved a greater stiffness of curved cable-nets in comparison with the planar ones and a need for careful arrangement of prestressing for curved cable-nets in sagging/hogging cables. Another study will follow with detailed research concerning optimal and safe design of the systems.","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68705351","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: 1
Modeling of irradiation by short laser pulse — Comparison of Boltzmann transport equation and a two-temperature model with experimental data 激光短脉冲辐照的建模——玻尔兹曼输运方程与双温模型与实验数据的比较
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2022-01-01 DOI: 10.21495/51-2-213
A. Korczak, J. Dziatkiewicz
{"title":"Modeling of irradiation by short laser pulse — Comparison of Boltzmann transport equation and a two-temperature model with experimental data","authors":"A. Korczak, J. Dziatkiewicz","doi":"10.21495/51-2-213","DOIUrl":"https://doi.org/10.21495/51-2-213","url":null,"abstract":": The presented paper investigates two methods of heat transfer problem in nanoscale. Simulations are takeover thin metal film irradiated by the ultrashort laser pulse. The first simulation is based on the Boltzmann transport equation and solved using the lattice Boltzmann method. The second applied method was the finite difference method with a two-temperature model. Results of both simulations were compared with experimental data what is presented in Calculations.","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68705691","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
A quick calibration tool for cyclic plasticity using analytical solution 一种基于解析解的循环塑性快速校正工具
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2022-01-01 DOI: 10.21495/51-2-249
R. Marek, S. Parma, V. Klepáč, H. Feigenbaum
{"title":"A quick calibration tool for cyclic plasticity using analytical solution","authors":"R. Marek, S. Parma, V. Klepáč, H. Feigenbaum","doi":"10.21495/51-2-249","DOIUrl":"https://doi.org/10.21495/51-2-249","url":null,"abstract":"","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68706407","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
Iterative evaluation of trabecular bone anisotropic apparent mechanical properties 小梁骨各向异性表观力学性能的迭代评价
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2022-01-01 DOI: 10.21495/51-2-69
A. Cichański, K. Nowicki
{"title":"Iterative evaluation of trabecular bone anisotropic apparent mechanical properties","authors":"A. Cichański, K. Nowicki","doi":"10.21495/51-2-69","DOIUrl":"https://doi.org/10.21495/51-2-69","url":null,"abstract":"","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68707876","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
Laser-welded I-sections stainless steel beam-columns 激光焊接工字截面不锈钢梁柱
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2022-01-01 DOI: 10.21495/51-2-97
N. Feber, M. Jandera
{"title":"Laser-welded I-sections stainless steel beam-columns","authors":"N. Feber, M. Jandera","doi":"10.21495/51-2-97","DOIUrl":"https://doi.org/10.21495/51-2-97","url":null,"abstract":"","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68708390","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
Smart operational load monitoring using decision trees and artificial neural networks: A comparative study 基于决策树和人工神经网络的智能运行负荷监测比较研究
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2022-01-01 DOI: 10.21495/51-2-269
W. Mucha, J. C. Viana, J. Nunes
{"title":"Smart operational load monitoring using decision trees and artificial neural networks: A comparative study","authors":"W. Mucha, J. C. Viana, J. Nunes","doi":"10.21495/51-2-269","DOIUrl":"https://doi.org/10.21495/51-2-269","url":null,"abstract":": Operational Load Monitoring is an industrial process that allows to predict the remaining in-service life of a mechanical structure under variable loads. Data from sensors embedded or mounted on the structure is acquired and allows to estimate the number and amplitude of load cycles that the structure has withstood so far in its working environment. This process is especially important in the aerospace industry where mechanical structures of an aircraft are monitored in order to maximize their operating lifetime. Smart Operational Load Monitoring means implementation of artificial intelligence techniques to the process in order to make predictions based on measurements from reduced number of sensors. In this paper a composite lightweight structure of typical geometry used in aircraft structures is taken as an example for Smart Operational Load Monitoring. The predictions are made from measurements from six strain gauges mounted to the structure, using carefully prepared artificial intelligence-based models. Efficiency of the models is compared, in terms of their prediction accuracies and computational complexities.","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68706108","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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