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Engineering Mechanics 2019最新文献

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INTERNAL AND EXTERNAL CAUSES OF TRESHINOOBRAZOVANIYA, SIGNS OF DEFORMATION OF THE COAL SEAM IN THE AREA OF VIBRATION EXPOSURE 内因和外因均有变形迹象，煤层在振动区暴露
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-271
M. Pavlenko, N. Barnov
{"title":"INTERNAL AND EXTERNAL CAUSES OF TRESHINOOBRAZOVANIYA, SIGNS OF DEFORMATION OF THE COAL SEAM IN THE AREA OF VIBRATION EXPOSURE","authors":"M. Pavlenko, N. Barnov","doi":"10.21495/71-0-271","DOIUrl":"https://doi.org/10.21495/71-0-271","url":null,"abstract":"","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133575560","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 THE NON-AXISYMMETRIC STRESS STATE IN THE PLASTICITY ZONE BY THE HOLE-DRILLING METHOD WITH OUT-OF-PLANE ESPI 面外电显微镜钻孔法测定塑性区非轴对称应力状态
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-295
A. L. Popov, D. Chelyubeev, A. Levitin, V. M. Kozintsev, A. Chentsov
{"title":"DETERMINATION OF THE NON-AXISYMMETRIC STRESS STATE IN THE PLASTICITY ZONE BY THE HOLE-DRILLING METHOD WITH OUT-OF-PLANE ESPI","authors":"A. L. Popov, D. Chelyubeev, A. Levitin, V. M. Kozintsev, A. Chentsov","doi":"10.21495/71-0-295","DOIUrl":"https://doi.org/10.21495/71-0-295","url":null,"abstract":": The stress state estimates accounting for plasticity are obtained at residual stress evaluation performed by hole-drilling method and out-of-plane ESPI. The plasticity zone in the sample is present prior to the probe hole drilling. The sample is a steel composite disc, assembled by fitting rings on the plug. The initial stress distribution in the composite elastic-ideal plastic disk accounting for the formation of a plastic zone in the covering ring is obtained by the solution of Gadolin in elastoplastic formulation. A simple analytical algorithm to adjust the non-axisymmetric stresses in comparison with the calculation according to the elastic model is developed. The case of probe hole drilling in the area of plastic deformations is considered.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131944498","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
COMPARATIVE STUDY OF SIMPLE TRUSS SOLVED ACCORDING TO THE THEORIES OF 1ST AND 2ND ORDER 一阶与二阶理论解简桁架的比较研究
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-117
K. Frydrýšek, M. Jahodová, Z. Morávková
{"title":"COMPARATIVE STUDY OF SIMPLE TRUSS SOLVED ACCORDING TO THE THEORIES OF 1ST AND 2ND ORDER","authors":"K. Frydrýšek, M. Jahodová, Z. Morávková","doi":"10.21495/71-0-117","DOIUrl":"https://doi.org/10.21495/71-0-117","url":null,"abstract":": This contribution deals with the simple planar asymmetric pin-connected truss with 3 members. The ways and methods of derivations and solutions according to theories of first and second order and other possible linearizations are shown (i.e. internal forces, reactions, elongations, stresses). There are applied linear and nonlinear approaches and their simplifications via Taylor’s series. Finally, the errors of all approaches are evaluated and compared.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133334012","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
CRANKSHAFT MECHANISM WITH OFFSET FOR THE COMBUSTION ENGINE 内燃机用带偏置的曲轴机构
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-65
P. Brabec, R. Voženílek, B. Menič
{"title":"CRANKSHAFT MECHANISM WITH OFFSET FOR THE COMBUSTION ENGINE","authors":"P. Brabec, R. Voženílek, B. Menič","doi":"10.21495/71-0-65","DOIUrl":"https://doi.org/10.21495/71-0-65","url":null,"abstract":"","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123704498","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 SYNCHRONOUS VIBRATION OF RIGID ROTORS MOUNTED IN MAGNETICALLY SENSITIVE SUPPORT ELEMENTS 安装在磁敏感支承元件中的刚性转子同步振动的稳定性
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-419
J. Zapoměl, J. Ferfecki, J. Kozánek
{"title":"STABILITY OF SYNCHRONOUS VIBRATION OF RIGID ROTORS MOUNTED IN MAGNETICALLY SENSITIVE SUPPORT ELEMENTS","authors":"J. Zapoměl, J. Ferfecki, J. Kozánek","doi":"10.21495/71-0-419","DOIUrl":"https://doi.org/10.21495/71-0-419","url":null,"abstract":"","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116267011","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 A CYCLIC BEHAVIOR OF 316L STEEL IN UNIAXIAL AND MULTIAXIAL CYCLIC LOADING 316l钢在单轴和多轴循环加载下的循环性能比较
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-287
L. Poczklán, T. Kruml, V. Mazánová
{"title":"COMPARISON OF A CYCLIC BEHAVIOR OF 316L STEEL IN UNIAXIAL AND MULTIAXIAL CYCLIC LOADING","authors":"L. Poczklán, T. Kruml, V. Mazánová","doi":"10.21495/71-0-287","DOIUrl":"https://doi.org/10.21495/71-0-287","url":null,"abstract":": A study of the cyclic behavior of austenitic stainless steel 316L was carried out in uniaxial loading, pure torsional loading and multiaxial in phase loading. Experiments were performed on hollow cylindrical specimens with polished surface. The specimens were cyclically loaded at room temperature with constant total strain amplitude. The specimen surface was observed by scanning electron microscopy and the microstructure was investigated by transmission electron microscopy. Differences in the mechanical response in different loading modes are discussed. It was found that the exhibited secondary hardening is caused by both the phase transformation and the appearance of  ` martensite. The phase transformation is more intense in the case of torsional loading as compared to axial loading. The crack initiation mechanism does not change considerably in individual modes. Persistent slip bands occur and fatigue cracks initiate along","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122495543","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
NUMERICAL STUDIES BASED ON THE HIGHER ORDER HEAT CONDUCTION THEORY 基于高阶热传导理论的数值研究
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-311
M. Repka, J. Sládek, V. Sládek
{"title":"NUMERICAL STUDIES BASED ON THE HIGHER ORDER HEAT CONDUCTION THEORY","authors":"M. Repka, J. Sládek, V. Sládek","doi":"10.21495/71-0-311","DOIUrl":"https://doi.org/10.21495/71-0-311","url":null,"abstract":": The higher order heat conduction equation is considered to study a one dimensional problem. The related boundary value problem is solved numerically via finite element method and compared with analytical solution. The influence of the characteristic time parameter from generalized heat conduction equation is investigated in numerical examples.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122589150","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
CONTROL TEST OF A WEARABLE ELBOW ORTHOSIS WITH BI-MUSCULAR PNEUMATIC SERVO-DRIVE BASED ON BRAIN-COMPUTER INTERFACE 基于脑机接口的双肌肉气动伺服可穿戴肘矫形器控制试验
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-93
R. Dindorf, P. Woś
{"title":"CONTROL TEST OF A WEARABLE ELBOW ORTHOSIS WITH BI-MUSCULAR PNEUMATIC SERVO-DRIVE BASED ON BRAIN-COMPUTER INTERFACE","authors":"R. Dindorf, P. Woś","doi":"10.21495/71-0-93","DOIUrl":"https://doi.org/10.21495/71-0-93","url":null,"abstract":": The paper presents a control tests of a wearable orthosis of elbow joint with a bi-muscular pneumatic servo-drive. Brain-computer interface (BCI) based control is a complex task, because it must contain a device for recording bioelectric signals (BESs) and translate them into control signals (CS) of the elbow orthosis. The authors analysed the impact of the induced brain activity and the muscular tension within the head of the participant on the BESs which can be used to control the pneumatic servo drive of the elbow joint orthosis. For controlling the elbow joint orthosis, a distributed control system (DCS) was developed that contains two control layers: a master layer connected to the BCI device and a direct layer contained in a wireless manner with the controller of the pneumatic servo-drive (PSD). In the programming of the PSD controller, a kinematic-dynamic model of the elbow joint orthosis, patterned after the biological model of human biceps-triceps, was used. A biomimetic dynamic model of the pneumatic muscle actuator (PMA) was used, in which the contraction force results from the adopted exponential static model of the pneumatic muscle (PM). Use of direct visual feedback (DVF) makes it possible for the participant to focus on the movement of the orthosis taking into account the motoric functions of the elbow.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"157 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125246456","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 VARIOUS DISTRIBUTIONS USED FOR COLLAGEN FIBRE ORIENTATIONS IN ARTERIAL LAYERS 动脉层胶原纤维取向不同分布的比较
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-113
J. Fischer, J. Burša
{"title":"COMPARISON OF VARIOUS DISTRIBUTIONS USED FOR COLLAGEN FIBRE ORIENTATIONS IN ARTERIAL LAYERS","authors":"J. Fischer, J. Burša","doi":"10.21495/71-0-113","DOIUrl":"https://doi.org/10.21495/71-0-113","url":null,"abstract":"To consider tissue anisotropy in computational models of arterial wall, information on directions of collagen fibres and their dispersion in the individual layers of the wall is needed. Many papers introduce the assumption of two fibre families although its experimental substantiation is poor. In this paper we analyse data on direction distribution of collagen fibres published in several papers, in contrast to their authors, without any anticipatory assumptions. Histograms and their different mathematical representations are compared by means of coefficient of determination R2 to obtain the best representation of the experimental data. The results show that in most of the analysed cases other distributions give better representation of the experimental data; specifically, the presented bimodal fit was surpassed with uni-, trior quadri-modal distributions or even with isotropic distribution with a large noise. This effect could be even enhanced when information criteria were applied. Finally, the best mathematical representations of the data (the best fits) are transformed into parameters used by anisotropic constitutive models in FEM analyses.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125511451","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: 4
DOPROC METHOD IMPROVEMENTS AND ITS APPLICATION IN STRUCTURAL FATIGUE ANALYSIS Doproc方法的改进及其在结构疲劳分析中的应用
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-207
M. Krejsa, J. Koktan, J. Brožovský, P. Janás, V. Krejsa
{"title":"DOPROC METHOD IMPROVEMENTS AND ITS APPLICATION IN STRUCTURAL FATIGUE ANALYSIS","authors":"M. Krejsa, J. Koktan, J. Brožovský, P. Janás, V. Krejsa","doi":"10.21495/71-0-207","DOIUrl":"https://doi.org/10.21495/71-0-207","url":null,"abstract":"Probabilistic methods allow better account of the randomness of input quantities in the design process and the reliability assessment. These computing approaches are currently enjoying an increasing popularity in civil engineering practice. New probabilistic procedures have been developing and implementing in commercial software. The main disadvantage is the inaccurate estimate of the resulting probability of failure and the high demands on computing technology and machine time. The presented DOProC method uses optimized numerical integration to calculate the probability of failure. The main improvement of this method is an increase in the accuracy of calculating the probability of failure by modification of the basic algorithm and reduction of computation time using parallelization. First experiences are gained in using the DOProC method on supercomputers. Probabilistic modeling and prediction of fatigue damage is one of the fields where the DOProC method is advantageously utilized and applied.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129747067","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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