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Localization of a local stiffness decrease 局部刚度下降的局部化
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-171
M. Musil, J. Úradníček, M. Palenik
{"title":"Localization of a local stiffness decrease","authors":"M. Musil, J. Úradníček, M. Palenik","doi":"10.21495/em2023-171","DOIUrl":"https://doi.org/10.21495/em2023-171","url":null,"abstract":": The article using an example of a FEM model describes decreasing tendency of natural frequencies in a context of a local reduction of beam stiffness for specific areas, named pliable regions. It is demonstrated that the drop in natural frequencies also depends on the location of the pliable region, because different curvatures of individual modes relate to a specific position on the beam, which are related to an extent of deformation during bending oscillation. Degree of curvature of modes has an effect on a degree of decrease of their corresponding natural frequencies. Based on these statements, the principle of locating the pliable region on the beam is formulated based on a comparison of drops ratio of natural frequencies of the considered model with the polynomially approximated ratios. This method of locating pliable regions can be used in practice to diagnose machines or structures using an impact test.","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41901365","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
Compressor cascade positive and negative stall incidence angle correlation modelling using artificial neural networks 基于人工神经网络的压气机叶栅正、负失速攻角相关建模
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-127
F¨urst, Ing. Patrik Kov´aˇr, Prof. Ing. Jiˇr´ı F¨urst
{"title":"Compressor cascade positive and negative stall incidence angle correlation modelling using artificial neural networks","authors":"F¨urst, Ing. Patrik Kov´aˇr, Prof. Ing. Jiˇr´ı F¨urst","doi":"10.21495/em2023-127","DOIUrl":"https://doi.org/10.21495/em2023-127","url":null,"abstract":": The analysis of the flows by computational fluid dynamics becomes useful design and optimization method during recent years. Despite the advances in the computational power but it could be still very demanding. Therefore empirical models are commonly used as a main tool for design and prediction of basic performance of axial compressor cascades. The empirical correlations are derived from experimental data obtained from two-dimensional measurements. Unfortunately, sufficient amount of data is available only in cases of well-known airfoils as e","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44694174","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
Innovative station for determining the profile of tissue puncture force using a needle used in amniocentesis procedures 创新的工作站，用于使用羊水穿刺程序中使用的针头确定组织穿刺力的分布
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-79
G. Gruszka, M. Ples, P. Wodarski, K. Daniec, A. Nawrat, D. Bereska, R. Koteras, P. Kosiński, M. Wielgoś
{"title":"Innovative station for determining the profile of tissue puncture force using a needle used in amniocentesis procedures","authors":"G. Gruszka, M. Ples, P. Wodarski, K. Daniec, A. Nawrat, D. Bereska, R. Koteras, P. Kosiński, M. Wielgoś","doi":"10.21495/em2023-79","DOIUrl":"https://doi.org/10.21495/em2023-79","url":null,"abstract":": In this paper we present the results of design works aiming to create a new, functional device that would allow testing the amount of force required for a amniocentesis needle to puncture tissue. The device was supposed to take form of an addition to a standard, market-available 3D Printer and allow collection of data about relation of force to depth of penetration. The device was assembled, made of easily accessible components and 3D printed parts and initial tests proving its functionality were performed. The construction of the device was presented and tests were carried out to verify the functionality of the device on the basis of puncture through selected materials. The results confirm the usefulness of the construction in determining the needle penetration force through human and animal tissues.","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49655417","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
Development of autonomous experimental system to analyse yield surfaces distortion due to multiaxial ratcheting 分析多轴棘轮作用下屈服面畸变的自主实验系统的开发
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-243
J. Svárovský, S. Parma, J. Štefan, C. Ciocanel, H. Feigenbaum, R. Marek, V. Klepáč, J. Plešek
{"title":"Development of autonomous experimental system to analyse yield surfaces distortion due to multiaxial ratcheting","authors":"J. Svárovský, S. Parma, J. Štefan, C. Ciocanel, H. Feigenbaum, R. Marek, V. Klepáč, J. Plešek","doi":"10.21495/em2023-243","DOIUrl":"https://doi.org/10.21495/em2023-243","url":null,"abstract":": Multiaxial ratcheting is a failure mode of structures characterized by the accumulation of plastic strain due to cyclic loading. Despite several models having been developed to predict multiaxial ratcheting, they often fail when validated with experimental data collected under a wide array of loading conditions. In this study, an experimental setup was developed and an autonomous testing procedure was used to experimentally analyze the evolution of the yield surface shape due to cyclic biaxial loading. Thin-walled tubular test specimens were made of 304L steel with a diameter of 40 mm and underwent axial-torsional testing using the Instron 8852 system. The total axial strain was increased from 0 to 1% while the total shear strain underwent 5 cycles with the strain amplitude of 0.5% and the mean strain of 0.5%. Three yield surfaces were measured after the straining sequence was completed. Results showed strong directional distortional hardening and good agreement between the flow vectors and the normals to the yield surface, lending support to the associative flow rule.","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43166558","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
Multi-parameter MTS criterion used for estimation of the crack deflection angle near a corrosion pit 用于估算腐蚀坑附近裂纹偏转角的多参数MTS准则
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-151
L. Malíková
{"title":"Multi-parameter MTS criterion used for estimation of the crack deflection angle near a corrosion pit","authors":"L. Malíková","doi":"10.21495/em2023-151","DOIUrl":"https://doi.org/10.21495/em2023-151","url":null,"abstract":": Combined fatigue and corrosion damage is very typical for metal materials subjected to aggressive environment. Unfortunately, this topic is still not described sufficiently. Thus, a high strength steel specimen was subjected to a numerical analysis studying the mutual interaction of a fatigue crack and a corrosion pit within this work. Finite element method was utilized to model an inclined surface crack near a corrosion pit and then, the multi-parameter form of maximum tangential stress criterion was applied to estimate the crack deflection angle. Because the simulations were linear and parametric, it was easy to investigate effect of individual parameters on the results obtained. In the paper presented, the influence of the crack length, the number of the Williams expansion terms considered for tangential stress approximation and the critical distance, where the fracture criterion was applied, is discussed. The conclusions formulated based on the results of the study shall help to better understand how the fatigue crack behavior can be affected via presence of corrosion defects.","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41884124","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
Analysis of cable-net systems for glass facades 玻璃幕墙索网系统分析
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-123
V. Komlev, J. Machacek
{"title":"Analysis of cable-net systems for glass facades","authors":"V. Komlev, J. Machacek","doi":"10.21495/em2023-123","DOIUrl":"https://doi.org/10.21495/em2023-123","url":null,"abstract":": The paper deals with numerical analysis of cable-net systems supporting large facades of prominent buildings/halls. Following the former proposal and validation of the numerical model by the Authors the current paper provides some details on the modelling in ANSYS software. Based on the previous results the embodiment of glass panes and their rigidity for the apt description of the behavior is essential. The use of geometrically nonlinear analysis for the planar cable-nets with glass laminated panes attached to the net with point-fixed bolted connections comprising glazing bolt and spider fittings is described. The preliminary parametric study concerning the net arrangement is presented.","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42432357","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
Challenges in the thermal design of low-capacity grate combustion chambers 低容量篦式燃烧室热设计的挑战
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-267
J. Zabloudil, Z. Jegla, V. Freisleben
{"title":"Challenges in the thermal design of low-capacity grate combustion chambers","authors":"J. Zabloudil, Z. Jegla, V. Freisleben","doi":"10.21495/em2023-267","DOIUrl":"https://doi.org/10.21495/em2023-267","url":null,"abstract":": The article deals with the issue of the use and reliability of the standard thermal design calculation of grate combustion chambers of low-capacity local heat sources. This standard analytical calculation based on dimensionless characteristic numbers tends to fail when applied to smaller furnaces even though it gives good results for centralized sources of higher capacity. However, when designing low-capacity boilers, it is still appropriate and advantageous to use this standard (empirical-analytical) calculation, which is able to give at least indicative results in an incomparably shorter time and with significantly lower costs than an alternative and demanding numerical analysis based on CFD (Computational Fluid Dynamics) analysis.","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44462416","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
Analysis suggestion for vehicle scanning method 车辆扫描方法分析建议
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-39
J. Bayer
{"title":"Analysis suggestion for vehicle scanning method","authors":"J. Bayer","doi":"10.21495/em2023-39","DOIUrl":"https://doi.org/10.21495/em2023-39","url":null,"abstract":"","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44183967","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
Sailplane wing sectioning based on structural weight 基于结构重量的帆翼剖面
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-59
L. Dubnicky, J. Šplíchal, J. Juračka
{"title":"Sailplane wing sectioning based on structural weight","authors":"L. Dubnicky, J. Šplíchal, J. Juračka","doi":"10.21495/em2023-59","DOIUrl":"https://doi.org/10.21495/em2023-59","url":null,"abstract":": High-performance sailplanes use large wingspans, and the wings are split into sections to allow ground transport, storing and maintenance. Sometimes more section variants are available, resulting in different overall sailplane wingspans. Regular wing sectioning nowadays consists of 4 sections, with considerable weight differences between the inner and the outer sections. The option to use 3-piece sectioning is reviewed and combined with 2 wingspan variants. The splitting location, based on the equal weight distribution among the sections, is calculated according to the wing weight distribution model. The following structural design provided a more accurate wing mass value and the weight distribution model. The original and the calculated weight distributions are compared and an improvement is suggested for later application.","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41672789","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
On uncertain parameters in a model of hypoplasticity 关于低塑性模型中的不确定参数
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-219
J. Runcziková, J. Chleboun
{"title":"On uncertain parameters in a model of hypoplasticity","authors":"J. Runcziková, J. Chleboun","doi":"10.21495/em2023-219","DOIUrl":"https://doi.org/10.21495/em2023-219","url":null,"abstract":": The contribution deals with the mathematical modelling of hypoplasticity of granular materials. The problem of stress-controlled hypoplasticity with a cyclic proportional loading and unloading of drained granular material under different anisotropic settings is considered, and a gradual compaction of the material, called ratchetting, is investigated together with the influence of uncertain input parameters on the model outputs, namely the strain components in the material in its limit (i.e. compacted) state. The uncertainty quantification is presented through 3D graphs. The depicted data also allows for a fuzzy set interpretation.","PeriodicalId":38731,"journal":{"name":"Gong Cheng Li Xue/Engineering Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41939886","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
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