发布求助
文献互助 智能选刊 最新文献

Gong Cheng Li Xue/Engineering Mechanics最新文献

筛选
英文 中文
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
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
The effect of various positions of the straight fin heat sink on the electrical schwitchboard cooling 直翅片散热器不同位置对配电板冷却的影响
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-167
J. Musil, P. Procházka, V. Uruba
{"title":"The effect of various positions of the straight fin heat sink on the electrical schwitchboard cooling","authors":"J. Musil, P. Procházka, V. Uruba","doi":"10.21495/em2023-167","DOIUrl":"https://doi.org/10.21495/em2023-167","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":"45252193","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 vortex-induced vibration by convolution neural network 涡激振动的卷积神经网络研究
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-47
O. Bublík, V. Heidler, A. Pecka, J. Vimmr
{"title":"Investigation of the vortex-induced vibration by convolution neural network","authors":"O. Bublík, V. Heidler, A. Pecka, J. Vimmr","doi":"10.21495/em2023-47","DOIUrl":"https://doi.org/10.21495/em2023-47","url":null,"abstract":": The focus of this paper is to use a convolutional neural network to predict the unsteady laminar flow field in 2D domains, specifically as it relates to vortex induced vibration. In this scenario, an incompressible fluid is flowing around a cylinder, creating a vortex street that leads to oscillation of the cylinder. The movement of the cylinder, which has only one degree of freedom, is modeled using a linear spring-mass-damper equation. The research examines the cylinder’s amplitude response for different spring stiffnesses and damping coefficients, and compares the results to those obtained from FSI computational fluid","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":"43093503","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
Mechanical concept of aeroelastic demonstrator and methodology for experimental investigation of propeller aerodynamic derivatives 气动弹性演示器的力学概念和螺旋桨气动导数实验研究方法
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-55
J. Cecrdle
{"title":"Mechanical concept of aeroelastic demonstrator and methodology for experimental investigation of propeller aerodynamic derivatives","authors":"J. Cecrdle","doi":"10.21495/em2023-55","DOIUrl":"https://doi.org/10.21495/em2023-55","url":null,"abstract":": Whirl flutter is a specific type of flutter instability, for which the experimental validation of the analytical results is required. One of the key issues is the solution of propeller aerodynamic forces on a vibrating propeller. To determine propeller forces and moments, aerodynamic derivatives are used. The complete solution includes six independent derivatives, four of which may be investigated experimentally. The subjected demonstrator represents a sting-mounted nacelle with a motor and propeller. It includes engine pitch and yaw degrees-of-freedom. Both stiffness constants are adjustable and both pivots are movable in the direction of the propeller axis. For the measurement, a single degree-of-freedom model is to be used; therefore, the blocking of either pitch or yaw movement is provided. Pitching moment (c m  ) and vertical force (c z  ) due to the pitch angle derivatives will be measured using pitch-only model arrangement. Pitching moment (c m  ) and vertical force (c z  ) due to the yaw angle derivatives will be measured using yaw-only model arrangement. Measurement includes pitch and yaw angles and pitch or yaw pivot moment, respectively. To separate the contributions of both force and moment to the total moment, the measurement of two configurations varying the distance between the gimbal axis and the propeller plane is used.","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":"48752869","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
Anisotropy of soft biological tissues and its consideration in constitutive models of arteries 软生物组织的各向异性及其在动脉本构模型中的考虑
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-17
J. Burša, A. Hrubanová, P. Skacel, J. Fischer, M. Turčanová, O. Lisický
{"title":"Anisotropy of soft biological tissues and its consideration in constitutive models of arteries","authors":"J. Burša, A. Hrubanová, P. Skacel, J. Fischer, M. Turčanová, O. Lisický","doi":"10.21495/em2023-17","DOIUrl":"https://doi.org/10.21495/em2023-17","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":"47842291","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
Dynamics of a cantilever beam with piezoelectric sensor: Experimental study 带有压电传感器的悬臂梁动力学:实验研究
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-119
R. Kolman, J. Kylar, V. Kotek, R. Cimrman, L. Musil
{"title":"Dynamics of a cantilever beam with piezoelectric sensor: Experimental study","authors":"R. Kolman, J. Kylar, V. Kotek, R. Cimrman, L. Musil","doi":"10.21495/em2023-119","DOIUrl":"https://doi.org/10.21495/em2023-119","url":null,"abstract":": Online and real-time sensing and monitoring of the health state of complex structures, such as aircraft and critical parts of power stations, is an essential part of the research in dynamics. Several types of sensors are used for sensing dynamic responses and monitoring response changes during the operation of critical parts of complex systems. The piezoelectric (PZ) materials belong to one group of electroactive materials, which transform mechanical deformation into an electrical response. For example, PZ ceramics or PVDF foils are employed for online sensing of the time history of mechanical deformation. Experimentally obtained response of a cantilever beam structure with a glued PZ sensor is the case of interest in this contribution. During the transient problem of the beam loaded by suddenly interrupted load due to the weight of a mass at the end of the beam, the time history of normal velocity at a point on the beam surface has been measured by a laser vibrometer and parallely, the output voltage on the PZ sensor has been measured by an electric device. The experimental data in the case of the first eigen-frequency is in good agreement with the value given by the formulae from the theoretical modeling of free vibration of a linear beam.","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":"48318445","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
Quantitative model for silicon-acrylate mixtures 硅丙烯酸酯混合物的定量模型
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-235
K. Sladká
{"title":"Quantitative model for silicon-acrylate mixtures","authors":"K. Sladká","doi":"10.21495/em2023-235","DOIUrl":"https://doi.org/10.21495/em2023-235","url":null,"abstract":": Protection of surface layers of building materials are very important in construction industry. Plasters, which are used as a cover layer of load bearing structure, must resist to the adverse natural conditions, corrosion or mechanical damage. As the surface treatment there are used coatings which must require material and physical characteristics and help to resist to the material degradation. This article is focused on silicon-acrylate coatings. Silicons (polysiloxanes) are very resistant and expensive. Acrylates are cheaper and less resistant than polsiloxanes. The coating samples were measured in the ATR module in the infrared spectrometer. The advantage of this method is that the sample doesn´t need to be modified and the measurement is quite cheap. As a result, the mathematical model for quantitative analysis was created – the quadratic dependence of carbonyl peak area on the concentration of acrylate. Indirectly, the polysiloxane concentration can be calculated. In the reality the calculation of polysiloxane concentration can be the problem because of additives. The conditions of the measurement were specified and the statistical deviation was determined to be 4.6 %.","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":"47813099","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
Deep learning methods for the acoustic emission methods to evaluate an onset of plastic straining 用于评估塑性应变开始的声发射方法的深度学习方法
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-187
S. Parma, M. Kovanda, M. Chlada, J. Štefan, J. Kober, H. Feigenbaum, J. Plešek
{"title":"Deep learning methods for the acoustic emission methods to evaluate an onset of plastic straining","authors":"S. Parma, M. Kovanda, M. Chlada, J. Štefan, J. Kober, H. Feigenbaum, J. Plešek","doi":"10.21495/em2023-187","DOIUrl":"https://doi.org/10.21495/em2023-187","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":"44349738","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
Comparison of finite element simulation of tungsten nanoindentation with Berkovich and conical indenter Berkovich和锥形压头对钨纳米压痕的有限元模拟比较
Gong Cheng Li Xue/Engineering Mechanics Pub Date : 2023-05-11 DOI: 10.21495/em2023-63
L. Fiala, I. Ballo, J. Kovář, V. Fuis
{"title":"Comparison of finite element simulation of tungsten nanoindentation with Berkovich and conical indenter","authors":"L. Fiala, I. Ballo, J. Kovář, V. Fuis","doi":"10.21495/em2023-63","DOIUrl":"https://doi.org/10.21495/em2023-63","url":null,"abstract":": Finite Element Method (FEM) was used to study the difference between using Berkovich and conical indenters in nanoindentation test of tungsten specimen. The study was aimed to determine the modulus of elasticity of a tested specimen and how it changes with different indenter. The FEM analysis also revealed that the modulus of elasticity was sensitive to the dimensions of both specimen and the indenter for which were made several numerical calculations with different dimensions.","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":"46906184","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信