发布求助
文献互助 智能选刊 最新文献

Engineering Mechanics 2020最新文献

筛选
英文 中文
DETERMINATION OF THE RELATIONSHIP BETWEEN KINEMATIC QUANTITIES OF A MECHANICAL SYSTEM WITH DAMPING 确定具有阻尼的机械系统的运动学量之间的关系
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-206
D. Hroncová, I. Delyová, P. Sivák
{"title":"DETERMINATION OF THE RELATIONSHIP BETWEEN KINEMATIC QUANTITIES OF A MECHANICAL SYSTEM WITH DAMPING","authors":"D. Hroncová, I. Delyová, P. Sivák","doi":"10.21495/5896-3-206","DOIUrl":"https://doi.org/10.21495/5896-3-206","url":null,"abstract":": The motion of a bound mechanical system is described by position, speed and acceleration of all its members and joints. The paper deals with the kinematic analysis of a four-joint mechanism using MSC Adams. The model of the mechanism is used to show the dynamic investigation of a bound mechanical system. Lagrange equations of mixed type were used in this case as well as a suitable tool for compiling equations of motion for the analytical investigation.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"32 23","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132241205","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
RADAR INTERFEROMETRY TESTS OF THE BRIDGE RESPONSE DURING FULL TRAFFIC 全工况下桥梁响应的雷达干涉测量试验
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-318
K. Lamperová, M. Sokol
{"title":"RADAR INTERFEROMETRY TESTS OF THE BRIDGE RESPONSE DURING FULL TRAFFIC","authors":"K. Lamperová, M. Sokol","doi":"10.21495/5896-3-318","DOIUrl":"https://doi.org/10.21495/5896-3-318","url":null,"abstract":": This paper is devoted to measuring and evaluating displacements of the Prístavný most in Bratislava, Slovakia. It is a combined four-span highway and railway bridge with a length of 460.8 m. It is important to have knowledge of the functioning of the observed structure. Without a thorough and detailed numerical analysis, it is very difficult to correctly evaluate all measured data. Without detailed calibrated numerical models, in some cases it would not be possible to verify response of the structures. By comparing the numerical calculations and the measured data, we have the possibility to detect some structural defects that may not be visible. At the same time, we were be able to verify the impact of some non-structural elements of the structure on its behavior.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132464772","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
KEY AREAS OF ENGINEERING MECHANICS IN DESIGN OF MODERN INTEGRATED PROCESS EQUIPMENT 工程力学在现代集成工艺设备设计中的关键领域
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-026
Z. Jegla, M. Reppich, M. Krňávek, J. Horsák
{"title":"KEY AREAS OF ENGINEERING MECHANICS IN DESIGN OF MODERN INTEGRATED PROCESS EQUIPMENT","authors":"Z. Jegla, M. Reppich, M. Krňávek, J. Horsák","doi":"10.21495/5896-3-026","DOIUrl":"https://doi.org/10.21495/5896-3-026","url":null,"abstract":": Process engineering is a technical specialization focused on the design of industrial processes and equipment whose purpose is generally to convert raw materials into desired products. These include, for example, not only chemical or refinery processes, but also food and pharmaceutical processes, waste treatment processes and many others. Coverage of such a wide range of different technologies enables the concept of unit operations completed by a process integration technique allowing an efficient sequencing of unit operations in a process so that the process is designed and operated as cost-effectively as possible. In the context of global changes and the need for maximum energy efficient and environmentally friendly solutions of production processes, a new trend of so-called modern integrated equipment (MIE) is now starting. The MIE are generally characterized by maximum efficiency and multifunctionality via aggregation of multiple unit operations into a single apparatus. It reduces the process to the minimum number of equipment, thus reducing both investment and operating costs while process works efficiently and more environmentally. The MIE design principles are presented in the paper together with several design challenges addressed to the relevant key areas of engineering mechanics to which attention in the paper will be also paid.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123273512","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
DESIGN OF EXPERIMENTAL DEVICE FOR TESTING OF SUBCOOLED FLOW BOILLING 过冷流沸腾试验装置的设计
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-150
M. Gleitz, P. Zácha, S. Entler, J. Syblik
{"title":"DESIGN OF EXPERIMENTAL DEVICE FOR TESTING OF SUBCOOLED FLOW BOILLING","authors":"M. Gleitz, P. Zácha, S. Entler, J. Syblik","doi":"10.21495/5896-3-150","DOIUrl":"https://doi.org/10.21495/5896-3-150","url":null,"abstract":": The article presents the principle and function of the Hypervapotron and the current work progress on the realisation of the experimental loop. Hypervapotron is a heat exchanger operating in a two-phase flow regime, in which the latent heat of the water/steam phase transformation is used, which enables the transfer of large heat fluxes (up to tens of MW/m 2 ). For this reason, it appears to be very promising for use in fusion reactors. The article describes the steps leading to the final design of the experimental loop - selection of suitable mesh parameters in the Star-CCM+ code, geometry and used materials of the single elements of the heating system using electromagnetic induction. The effort of the experimental loop and the flow study in the Hypervapotron in general, is dimensional and material optimization of the geometry is suitable for a wide range of applications for which the benefits of subcooled boiling and Hypervapotron geometry can be applied.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"429 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115955769","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
MULTIFOLD STATIONARY SOLUTIONS OF AN AUTO-PARAMETRIC NON-LINEAR 2DOF SYSTEM 自参数非线性2自由度系统的多重平稳解
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-130
C. Fischer, J. Náprstek
{"title":"MULTIFOLD STATIONARY SOLUTIONS OF AN AUTO-PARAMETRIC NON-LINEAR 2DOF SYSTEM","authors":"C. Fischer, J. Náprstek","doi":"10.21495/5896-3-130","DOIUrl":"https://doi.org/10.21495/5896-3-130","url":null,"abstract":": A non-linear 2DOF model of a bridge girder with a bluff cross-section under wind loading is used to describe the heave and pitch self-excited motion. Existence conditions of stationary auto-parametric response for both the self-excited case and an assumption of a harmonic load form a non-linear algebraic system of equations. Number of distinct solutions to this algebraic system depends on the frequencies of two principal aero-elastic modes and other system parameters. Thus, the system may possess none, one, or several stationary solutions, whose stability has to be checked using the Routh-Hurwitz conditions. If all quantities entering the system are continuous functions, individual solutions may exhibit (piecewise) continuous dependence on selected system parameters. Thus, multiple identified solutions to the system for a given set of parameters may actually belong to a single solution branch and their values can be determined from the knowledge of the solution branch. Such a situation may significantly simplify assessment of stability of the particular solutions and/or provides an applicable overall description of the system response.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"191 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114964953","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
DESTABILIZATION OF DISC BRAKE MECHANICAL SYSTEM DUE TO NONPROPORTIONAL DAMPING 非比例阻尼引起的盘式制动器机械系统失稳
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-496
J. Úradníček, M. Musil, M. Bachratý, F. Havelka
{"title":"DESTABILIZATION OF DISC BRAKE MECHANICAL SYSTEM DUE TO NONPROPORTIONAL DAMPING","authors":"J. Úradníček, M. Musil, M. Bachratý, F. Havelka","doi":"10.21495/5896-3-496","DOIUrl":"https://doi.org/10.21495/5896-3-496","url":null,"abstract":": The paper deals with the study of a possible dissipation induced instability in a disc brake system, which leads to a self-excited vibration and thus to a brake squeal. The work describes an experimental estimation of the damping properties of a disc component of the simplified disc brake system. The stability of the system is analyzed numerically using the Finite Element approach and the Complex eigenvalue analysis. From the evolution of real parts of the eigenvalues with friction, the friction threshold value destabilizing the system is defined for the undamped and non-proportionally damped system. From the results, it can be seen how the damping non-proportionality can lead to the dissipation-induced instability of the disc brake system.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114980682","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: 3
ALTERNATIVE STRAIN-RATE DEPENDENT HYPERELASTIC-PLASTIC MATERIAL MODEL 替代应变率相关的超弹塑性材料模型
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-242
R. Jerabek, L. Écsi
{"title":"ALTERNATIVE STRAIN-RATE DEPENDENT HYPERELASTIC-PLASTIC MATERIAL MODEL","authors":"R. Jerabek, L. Écsi","doi":"10.21495/5896-3-242","DOIUrl":"https://doi.org/10.21495/5896-3-242","url":null,"abstract":": At present, multiplicative plasticity-based models are used to model material degradation of hyperelastic materials within the framework of finite-strain elastoplasticity. The underlying theory assumes that the intermediate configuration of the body is locally unstressed, and as a result, no plastic deformation field exists that meets the conditions of compatibility. The assumption is; however, neither mathematically nor physically justified and the related material models are not continuum-based. In this paper, an alternative strain-rate dependent hyperelastic-plastic material model is presented. Based on the theory of nonlinear continuum mechanics for finite deformation of elastoplastic media, the model can describe the plastic flow in an objective and thermodynamically consistent manner. Therefore the strain-rate density of the model and the specimen from the uniaxial tensile test of the modelled material can be related. In this paper, the dynamic behaviour of a silicone cross-shaped specimen is studied numerically using a Mooney-Rivlin material model with internal damping.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129855340","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
PRESSURE DROP STUDY OF POLYMERIC HOLLOW FIBER HEAT EXCHANGERS 聚合物中空纤维换热器的压降研究
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-314
T. Kroulíková, I. Astrouski, T. Kůdelová
{"title":"PRESSURE DROP STUDY OF POLYMERIC HOLLOW FIBER HEAT EXCHANGERS","authors":"T. Kroulíková, I. Astrouski, T. Kůdelová","doi":"10.21495/5896-3-314","DOIUrl":"https://doi.org/10.21495/5896-3-314","url":null,"abstract":": Polymeric hollow fiber heat exchangers are an alternative to common metal heat exchangers in low-temperature applications. Their advantages are low cost, low weight, and corrosion resistance. The heat transfer surface consists of hundreds or even thousands of fibers of small diameter. The PHFHE for gas-liquid application has a regular structure, which prevents the fibers from blocking the heat transfer surface and allow the gas to flow through the heat exchanger. This arrangement, known as the bank of tubes, is common for the multipass shell and tube heat exchangers. There are relations used to estimate the pressure drop of flow passing the bank of tubes. Those are based on extensive experimental research with steel tubes. Unfortunately, it seems that those relations do not apply to flexible fibers. This paper shows the discrepancy between the theory for non-flexible bank of tubes and measured data of PHFHE.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130071302","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
INFLUENCE OF TEMPERATURES AND SIZES OF WORK SEQUENCE ON CRACKS FORMATION IN RC WALLS 温度和工序尺寸对混凝土墙体裂缝形成的影响
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-456
R. Sonnenschein, L. Majtánová, K. Gajdosova
{"title":"INFLUENCE OF TEMPERATURES AND SIZES OF WORK SEQUENCE ON CRACKS FORMATION IN RC WALLS","authors":"R. Sonnenschein, L. Majtánová, K. Gajdosova","doi":"10.21495/5896-3-456","DOIUrl":"https://doi.org/10.21495/5896-3-456","url":null,"abstract":": The construction of the underground watertight structure is not only conditioned by the watertightness of the foundation slab, but also by the walls. The formation of a crack and thus the amount of reinforcement required to control the occurrence of a crack are dependent on several factors. The amount of tensile stresses occuring in the wall is mainly influenced by the ambient temperature at the time of concreting, the temperature of the foundation slab, which is already hardened, and the ratio of the height of the work sequence of the wall to its length.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120812213","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
IMPACT OF FORMALDEHYDE ON MECHANICAL PROPERTIES OF ATHEROSCLEROTIC CAROTID ARTERIES 甲醛对粥样硬化颈动脉力学性能的影响
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-210
A. Hrubanová, O. Lisický, P. Bartoňová, R. Staffa, M. Heřmanová, R. Vlachovsky, J. Burša
{"title":"IMPACT OF FORMALDEHYDE ON MECHANICAL PROPERTIES OF ATHEROSCLEROTIC CAROTID ARTERIES","authors":"A. Hrubanová, O. Lisický, P. Bartoňová, R. Staffa, M. Heřmanová, R. Vlachovsky, J. Burša","doi":"10.21495/5896-3-210","DOIUrl":"https://doi.org/10.21495/5896-3-210","url":null,"abstract":": Atherosclerosis is a life threatening cardiovascular disease causing lipoprotein accumulation within intima layer of artery wall and thus its thickening. Later stages are characterized by plaque formation with a lipid core separated from lumen by fibrous cap. In case of carotid arteries (CA), rupture of the plaque often results in a stroke. Detailed understanding of mechanical properties of atherosclerotic arteries and their components is essential for improvement of computer models used for prediction of plaque rupture. Samples of atherosclerotic CA from carotid endarterectomy were kept either in saline solution or in formaldehyde solution and then underwent uniaxial tensile testing in two directions. Statistical analysis of the obtained stress-strain responses shows that formaldehyde treatment of the tissue increases significantly the mean stiffness and reduces the dispersion.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122792551","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
首页 上一页
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：481959085
Book学术官方微信