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Engineering Mechanics 2020最新文献

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DISTORTIONAL BUCKLING RESISTANCE OF THIN-WALLED PROFILES MADE OF STAINLESS STEEL 不锈钢薄壁型材的抗扭曲屈曲性能
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-258
J. Jůza, M. Jandera
{"title":"DISTORTIONAL BUCKLING RESISTANCE OF THIN-WALLED PROFILES MADE OF STAINLESS STEEL","authors":"J. Jůza, M. Jandera","doi":"10.21495/5896-3-258","DOIUrl":"https://doi.org/10.21495/5896-3-258","url":null,"abstract":": The described research is focused on load-bearing capacity of compressed, stainless steel, thin-walled elements with a stiffener. This is typically a matter of trapezoidal sheeting design. An extensive numerical study was carried out with validation done on experiments from literature. As a result, a proposal of a distortional buckling curve specifically intended for stainless steel was made.","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":"115384746","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
FAMILY OF THE ROAD SIGNS MASTS VALIDATION IN ACCORDANCE TO EN 12767 根据en12767认证的路标桅杆系列
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-460
M. Stopel, A. Cichański, G. Kończalski, N. Yague
{"title":"FAMILY OF THE ROAD SIGNS MASTS VALIDATION IN ACCORDANCE TO EN 12767","authors":"M. Stopel, A. Cichański, G. Kończalski, N. Yague","doi":"10.21495/5896-3-460","DOIUrl":"https://doi.org/10.21495/5896-3-460","url":null,"abstract":": Occupant safety during car accidents is to a large degree dependent on road infrastructure behavior. For safety reasons, this type of infrastructure is designed taking into account legal requirements. The paper presents part of the process of certification of the road signs masts family accordingly to EN 12767. In the work, experimental results and numerical calculations of the crash test are presented. A comparison of numerical and experimental data is used in the validation process of developed methodology for preparing numerical models.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"53 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":"115551795","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
STATISTICAL ANALYSIS OF THE MODELS FOR ASSESSMENT OF THE PUNCHING RESISTANCE OF FLAT SLABS 平板冲孔阻力评估模型的统计分析
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-330
L. Majtánová, J. Halvonik
{"title":"STATISTICAL ANALYSIS OF THE MODELS FOR ASSESSMENT OF THE PUNCHING RESISTANCE OF FLAT SLABS","authors":"L. Majtánová, J. Halvonik","doi":"10.21495/5896-3-330","DOIUrl":"https://doi.org/10.21495/5896-3-330","url":null,"abstract":": Flat slabs are one of the most widely used structural system for the construction of administrative buildings nowadays. Together with many advantages connected particularly with architecture and construction processes the system possesses also some drawbacks. From a structural point of view, the most dangerous is the concentration of shear forces at the vicinity of columns which may cause punching of a slab. Punching is a dangerous phenomenon due to its brittle mode of failure and its ability to spread over a whole structure, which can be followed by a progressive collapse. Several models for the assessment of punching capacity have been developed and calibrated using experimental results from laboratory tests. This paper deals with a statistical evaluation of the safety level of two models for punching resistance without transverse reinforcement. One of the models is fully empirical, the EC2 (2004), the second model reflect the physical nature of the phenomenon, CF CSCT (2017). Database which includes results of more than 400 experimental tests on flat slab specimens has been used for the statistical evaluation.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"157 5 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":"128803062","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
SELECTED ADVERSE OPERATIONAL EFFECTS OF HYDROSTATIC SYSTEMS 选定的流体静力系统的不利操作影响
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-396
P. Osiński, M. Stosiak, K. Leszczynski
{"title":"SELECTED ADVERSE OPERATIONAL EFFECTS OF HYDROSTATIC SYSTEMS","authors":"P. Osiński, M. Stosiak, K. Leszczynski","doi":"10.21495/5896-3-396","DOIUrl":"https://doi.org/10.21495/5896-3-396","url":null,"abstract":": This paper discusses the operational and environmental aspects of hydrostatic systems. Requirements which such systems must meet and criteria for evaluating the latter are specified. The noisiness of operation of hydrostatic systems and the reduction of their environmental impact have become new major criteria. The interrelationship between pressure pulsations, mechanical vibrations and the noise (especially low-frequency noise) emitted to the environment is identified. Possible effective passive and active ways of reducing the adverse impact of hydrostatic systems are indicated.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"27 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":"127815704","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
APPLICATION OF MULTIBODY DYNAMICS TOOLS FOR DETERMINATION OF ENGINE EXCITED TURBOCHARGER VIBRATIONS 多体动力学工具在发动机受激涡轮增压器振动测定中的应用
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-384
P. Novotný, J. Dlugoš
{"title":"APPLICATION OF MULTIBODY DYNAMICS TOOLS FOR DETERMINATION OF ENGINE EXCITED TURBOCHARGER VIBRATIONS","authors":"P. Novotný, J. Dlugoš","doi":"10.21495/5896-3-384","DOIUrl":"https://doi.org/10.21495/5896-3-384","url":null,"abstract":"The problem of turbocharger rotor vibration is widely published in the world literature. However, areas requiring more detailed investigation are the vibration caused by the kinematic excitation of the turbocharger housing including the housing stiffness consideration. The aim of this paper is to analyse the vibration caused by the excitation from the internal combustion engine (ICE) and to present vibration on a key component of the turbocharger, which is a radial hydrodynamic bearing. Due to the nature of the problem, a multibody dynamics based tool is used, supplemented with sub-models of bearings. The non-linear model allows an effective solution of the vibration induced by the existence of rotor resonance states, rotor instabilities of the bearing or excitation from the ICE. The results presented on the radial bearing show that additional side frequency components and their orders appear in the frequency response spectrum. In the state of strong excitation, these frequency components can cause an increase in the acoustic emissions of the turbocharger as well as the entire powertrain.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"572 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":"124502900","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
STAINLESS STEEL I-SECTION BEAM-COLUMNS BEHAVIOR 不锈钢工字截面梁柱性能
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-126
N. Feber, M. Jandera
{"title":"STAINLESS STEEL I-SECTION BEAM-COLUMNS BEHAVIOR","authors":"N. Feber, M. Jandera","doi":"10.21495/5896-3-126","DOIUrl":"https://doi.org/10.21495/5896-3-126","url":null,"abstract":": The interaction between axial compression and major axis bending of welded stainless steel columns is being investigated at the Czech Technical University in Prague. This paper describes numerical modeling of welded stainless steel I-profile members loaded by a combined load (axial force and bending moment). The detailed finite element (FE) models were developed in software ABAQUS and subsequently validated against test results to simulate the interactive behavior and predict the ultimate capacity. The initial geometric imperfection modes, and amplitudes (global and local), and residual stress were considered to enhance the models accuracy. Material tensile coupon tests were also conducted. The aim of this work is to investigate the current design procedures for stainless steel beam-column members and compare them to the numerical results.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"252 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":"116725162","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
TRANSFER OF VIBRATION ENERGY FROM THE WAGON WHEEL TO THE TANK BODY AND POSSIBILITIES OF ITS REDUCTION 振动能量从货车轮向罐体的传递及其减小的可能性
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-102
O. Chlebo, J. Úradníček, S. Ziaran, M. Musil
{"title":"TRANSFER OF VIBRATION ENERGY FROM THE WAGON WHEEL TO THE TANK BODY AND POSSIBILITIES OF ITS REDUCTION","authors":"O. Chlebo, J. Úradníček, S. Ziaran, M. Musil","doi":"10.21495/5896-3-102","DOIUrl":"https://doi.org/10.21495/5896-3-102","url":null,"abstract":": The reduction of railway wagons´ vibration must be taken into account during a wagon design using appropriate vibro-isolation in order to reduce the transmission of structural noise from its main source. The paper analyses the vibration transmission, procedures and vibro-acoustic conditions with a view to reducing this vibration generated between the wagon wheel, as a main source of vibro-sound energy, and the tank body when applying a suitable vibro-isolation. The modal analysis of the tank wagon was complemented by the analysis of gravitational impact of the wheel on the rail generating its vibration. The transmission of the wheel components´ vibration from the wheel through the primary suspension, and the placement of the tank through the sliders and the ball joint into the tank body, is investigated. The solution is also based on the theoretical analysis and methodology of transmission of vibration energy, as well as on the measurement of vibration at the entry and exit measurement points of the main components of the wagon chassis. FFT and modal analysis were used to obtain the vibration parameters. Finally, this article aims at proposing some effective measures that may contribute to reducing the unwanted transmission of structural noise and thus decreasing both the noise emission and immission which have a negative impact on the environment and human health.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"53 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":"126562108","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
DETERMINATION OF MECHANICAL PROPERTIES OF BIOLOGICAL MATERIAL OF ANIMAL ORIGIN 动物源性生物材料力学性能的测定
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-170
B. Gzik-Zroska, K. Joszko, E. Kawlewska, A. Balin, J. Karczewski, P. Wyciślok
{"title":"DETERMINATION OF MECHANICAL PROPERTIES OF BIOLOGICAL MATERIAL OF ANIMAL ORIGIN","authors":"B. Gzik-Zroska, K. Joszko, E. Kawlewska, A. Balin, J. Karczewski, P. Wyciślok","doi":"10.21495/5896-3-170","DOIUrl":"https://doi.org/10.21495/5896-3-170","url":null,"abstract":"In this paper, it was described the experimental tests for animal’s intestines, that is used in the meat industry as the natural, edible casings. It was carried out the static tensile test in the physiological chamber in three temperatures for 201 samples. The main aim of investigations was to evaluate the influence of technological operations on the intestines’ mechanical properties. Obtained results can provide a basis for comparative analysis both for animal and human tissues.","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":"127018433","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
ASSOCIATED AND NON-ASSOCIATED FLOW RULES IN THE STRESS STATE PREDICTION 应力状态预测中的关联和非关联流动规律
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-512
R. Vobejda, F. Šebek, J. Petruška, P. Kubík
{"title":"ASSOCIATED AND NON-ASSOCIATED FLOW RULES IN THE STRESS STATE PREDICTION","authors":"R. Vobejda, F. Šebek, J. Petruška, P. Kubík","doi":"10.21495/5896-3-512","DOIUrl":"https://doi.org/10.21495/5896-3-512","url":null,"abstract":": The paper deals with an application of the non-associated flow rule within a complex plasticity model. This leads to a significant improvement in the predicted stress state. The predicted stress state is closer to theoretical value on the contrary to the case when an associated flow rule – within quadratic or non-quadratic yield criteria – is used. The implementation of a more flexible plasticity model will be subject of a further study. The results suggest that the yield criterion has to be more versatile within Haigh– Westergaard space.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"32 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":"127290668","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
INVERSE MASS MATRIX FOR HIGHER-ORDER FINITE ELEMENT METHOD IN LINEAR FREE-VIBRATION PROBLEMS 线性自由振动问题的高阶有限元反质量矩阵法
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-282
R. Kolman, J. A. González, R. Cimrman, J. Kopačka, S. S. Cho, Kyuyon Park
{"title":"INVERSE MASS MATRIX FOR HIGHER-ORDER FINITE ELEMENT METHOD IN LINEAR FREE-VIBRATION PROBLEMS","authors":"R. Kolman, J. A. González, R. Cimrman, J. Kopačka, S. S. Cho, Kyuyon Park","doi":"10.21495/5896-3-282","DOIUrl":"https://doi.org/10.21495/5896-3-282","url":null,"abstract":": In the paper, we present a direct inverse mass matrix in the higher-order finite element method for solid mechanics. The direct inverse mass matrix is sparse, has the same structure as the consistent mass matrix and preserves the total mass. The core of derivation of the semi-discrete mixed form is based on the Hamilton’s principle of least action. The cardinal issue is finding the relationship between discretized velocities and discretized linear momentum. Finally, the simple formula for the direct inverse mass matrix is presented as well as the choice of density-weighted dual shape functions for linear momentum with respect to the displacement shape function with a choice of the lumping mass method for obtaining the correct and positive definitive velocity-linear momentum operator. The application of Dirichlet boundary conditions into the direct inverse mass matrix for a floating system is achieved using the projection operator. The suggested methodology is tested on a free-vibration problem of heterogeneous bar for different orders of shape functions.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"80 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":"124422422","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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