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Engineering Mechanics 2019最新文献

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PROBABILISTIC IDENTIFICATION OF UNSATURATED SOIL HYDRAULIC PROPERTIES FROM SINGLE RING INFILTRATION EXPERIMENT 基于单环入渗试验的非饱和土水力特性概率识别
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-165
E. Janouchova, A. Kucerová, M. Kuráz
{"title":"PROBABILISTIC IDENTIFICATION OF UNSATURATED SOIL HYDRAULIC PROPERTIES FROM SINGLE RING INFILTRATION EXPERIMENT","authors":"E. Janouchova, A. Kucerová, M. Kuráz","doi":"10.21495/71-0-165","DOIUrl":"https://doi.org/10.21495/71-0-165","url":null,"abstract":": Knowledge of soil hydraulic properties is essential for modelling hydrodynamic phenomenons in soils under variably saturated conditions. This contribution focuses specifically on the properties of the top layer of soil which fundamentally influences the rainfall-runoff process, but the laboratory experimental proce-dures for the top-soil are very limited due to e.g. vegetation disturbing the experimental samples. The Richards equation describing the soil water flow process is here parameterised by the Mualem-van Genuchten model. The identification of the soil hydraulic parameters of this model is based on an in situ measurement of the single ring infiltration experiment. The experimental data and a priori information about parameters’ values are combined according to Bayes’ rule in order to obtain an updated probabilistic description of unknown parameters. The Bayesian inference is realized by the Markov chain Carlo method based on a less time-consuming polynomial approximation of the Mualem-van Genuchten model.","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":"129285812","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
ADVANCED DESIGN OF JOINTS WITH STEEL ELEMENTS IN TIMBER STRUCTURES 木结构中钢构件节点的先进设计
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-395
K. Vopatová, B. Židlický, M. Kuříková, K. Cábová
{"title":"ADVANCED DESIGN OF JOINTS WITH STEEL ELEMENTS IN TIMBER STRUCTURES","authors":"K. Vopatová, B. Židlický, M. Kuříková, K. Cábová","doi":"10.21495/71-0-395","DOIUrl":"https://doi.org/10.21495/71-0-395","url":null,"abstract":"Presented paper is focused on the design of timber joints with inserted steel sheet. Topicality of the problematic is presented together with a description of joints with the inner steel plate design and failure modes. The design resistance calculation is described in detail. The numerical model created in finite element software Abaqus is described. The analytical model was considered according to code EN 1995-1-1 (2006). The aim of this research is to show and compare numerical results of the timber joint with the current codified procedure provided by EN 1995-1-1 (2006), the general method and some proposals developed by other researchers recently. Furthermore, research results provide backgroung for the numerical software creation dealing with steel-timber joints. The numerical model validation made based on the analytical model is presented. Experimental programme is presented and its data serve for numerical model validation, as well.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"212 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":"132336620","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
DESIGN RESISTANCE OF STAINLESS-STEEL FILLET WELDS 不锈钢角焊缝的设计阻力
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-101
N. Feber, M. Jandera, L. Forejtová
{"title":"DESIGN RESISTANCE OF STAINLESS-STEEL FILLET WELDS","authors":"N. Feber, M. Jandera, L. Forejtová","doi":"10.21495/71-0-101","DOIUrl":"https://doi.org/10.21495/71-0-101","url":null,"abstract":"Welded joint strength depends on the correlation factor βw, which should be taken 1.0 for all stainless-steel families (according to Eurocode 3 (EN 1993-1-4, 2006)). The aim of this study is to investigate the strength and failure mode of the welded stainless-steel joints to determine the value of the correlation factor βw for austenitic grade EN 1.4301 based on experiments. The experiments investigation consists of tensile tests of two plates (15 mm thick) connected by four longitudinal fillet welds. The load was applied parallel to the weld causing only shear stress in the fillet weld. Every specimen was tested to investigate the strength, strain and failure mode.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"316 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113998778","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
MOTION SYNCHRONIZATION FOR ELECTRO-HYDRAULIC SERVO-DRIVES 电液伺服驱动的运动同步
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-407
P. Woś, R. Dindorf
{"title":"MOTION SYNCHRONIZATION FOR ELECTRO-HYDRAULIC SERVO-DRIVES","authors":"P. Woś, R. Dindorf","doi":"10.21495/71-0-407","DOIUrl":"https://doi.org/10.21495/71-0-407","url":null,"abstract":"Keywords: This article presents a control algorithm that solves the problem of motion synchronization for a system of three electro-hydraulic drives. The designed control system takes into account not only position errors for individual drive axes, but also synchronization errors with neighboring axes. The synchronization function for the control system, which takes into account the positioning errors of individual drive axes was specified. Experimental results on a 3-cylinder system were presented to verify the effectiveness of the proposed approach.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"5 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":"127990287","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
BEHAVIOUR OF EXTENDED BACKLASH BASED DRY FRICTION MODEL IN SIMULINK IN COMPARISON WITH DAHL AND LUGRE MODELS 基于扩展间隙的干摩擦模型在simulink中的性能与dahl和lugre模型的比较
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-359
P. Šnábl, L. Pešek, L. Pust
{"title":"BEHAVIOUR OF EXTENDED BACKLASH BASED DRY FRICTION MODEL IN SIMULINK IN COMPARISON WITH DAHL AND LUGRE MODELS","authors":"P. Šnábl, L. Pešek, L. Pust","doi":"10.21495/71-0-359","DOIUrl":"https://doi.org/10.21495/71-0-359","url":null,"abstract":"","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"232 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":"115489309","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 PARTICLE CONCENTRATION OF AL2O3 NANOFLUID ON THERMAL PERFORMANCE OF THE TWO PHASE NATURAL CIRCULATION LOOP al2o3纳米流体颗粒浓度对两相自然循环回路热性能的影响
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-347
S. Sudheer, K.Kiran Kumar, K. Balasubramanian
{"title":"INFLUENCE OF PARTICLE CONCENTRATION OF AL2O3 NANOFLUID ON THERMAL PERFORMANCE OF THE TWO PHASE NATURAL CIRCULATION LOOP","authors":"S. Sudheer, K.Kiran Kumar, K. Balasubramanian","doi":"10.21495/71-0-347","DOIUrl":"https://doi.org/10.21495/71-0-347","url":null,"abstract":"","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"39 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":"127079184","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 ANALYSIS OF ENERGY ABSORPTION BY SANDWICH PANELS ON THE ARAMID FIBER BACKING 芳纶纤维夹层板吸能的数值分析
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-53
M. Bocian, K. Jamroziak, D. Pyka, E. Babej
{"title":"NUMERICAL ANALYSIS OF ENERGY ABSORPTION BY SANDWICH PANELS ON THE ARAMID FIBER BACKING","authors":"M. Bocian, K. Jamroziak, D. Pyka, E. Babej","doi":"10.21495/71-0-53","DOIUrl":"https://doi.org/10.21495/71-0-53","url":null,"abstract":"The work concerns the analysis of a material solution on an aramid laminate reinforced with additional composite layers loaded with ballistic impact from the 7.62 mm M43 Full Metal Jacket (FMJ). The aim of the study is to identify alternative material systems to the reference 4 mm thick Armox A500T armored steel solution. The research was carried out using the finite element method with the application of the ABAQUS program. The optimal solutions for individual material systems were generated based on numerical analyses, thereby classifying them according to the mass-efficiency criterion. The numerical results obtained were validated in a ballistic experiment on samples made according to the methodology adopted for modeling. The range of absorbed energy and residual energy was determined for material systems based on the assumptions of the Recht-Ipson model.","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":"125868837","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
BI-PENALTY STABILIZED EXPLICIT FINITE ELEMENT ALGORITHM FOR ONE-DIMENSIONAL CONTACT-IMPACT PROBLEMS 一维接触碰撞问题的双罚稳定显式有限元算法
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-185
R. Kolman, J. Kopačka, A. Tkachuk, D. Gabriel, J. González
{"title":"BI-PENALTY STABILIZED EXPLICIT FINITE ELEMENT ALGORITHM FOR ONE-DIMENSIONAL CONTACT-IMPACT PROBLEMS","authors":"R. Kolman, J. Kopačka, A. Tkachuk, D. Gabriel, J. González","doi":"10.21495/71-0-185","DOIUrl":"https://doi.org/10.21495/71-0-185","url":null,"abstract":"In this contribution, a stabilization technique for finite element modelling of contact-impact problems based on the bipenalty method and the explicit predictor-corrector time integration is presented. The penalty method is a standard method for enforced contact constrains in dynamic problems. This method is easily implemented but the solution depends on numerical value of the stiffness penalty parameter and also the stability limit for explicit time integration is effected by a choice of this parameter. The bipenalty method is based on penalized not only stiffness term but also mass term concurrently. By this technique with a special ratio of mass and stiffness penalty parameters, the stability limit of contact-free problem is preserved. In this contribution, we also present a modification of the explicit time scheme based on predictor-corrector form. By meaning of this approach, spurious contact oscillations are eliminated and the results do not depend on numerical parameters.","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":"127492420","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
LOCAL STABILIZATION OF THE QUASIPERIODIC RESPONSE OF THE GENERALIZED VAN DER POL OSCILLATOR 广义范德波尔振荡器准周期响应的局部镇定
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-105
C. Fischer, J. Náprstek
{"title":"LOCAL STABILIZATION OF THE QUASIPERIODIC RESPONSE OF THE GENERALIZED VAN DER POL OSCILLATOR","authors":"C. Fischer, J. Náprstek","doi":"10.21495/71-0-105","DOIUrl":"https://doi.org/10.21495/71-0-105","url":null,"abstract":"","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"7 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":"124481253","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
OPTIMIZATION OF HOPKINSON BAR INSTRUMENTATION FOR TESTING OF CELLULAR AND LOW IMPEDANCE MATERIALS 优化霍普金森棒仪器测试细胞和低阻抗材料
Engineering Mechanics 2019 Pub Date : 2019-05-13 DOI: 10.21495/71-0-97
J. Falta, T. Fíla, M. Adorna, P. Zlámal
{"title":"OPTIMIZATION OF HOPKINSON BAR INSTRUMENTATION FOR TESTING OF CELLULAR AND LOW IMPEDANCE MATERIALS","authors":"J. Falta, T. Fíla, M. Adorna, P. Zlámal","doi":"10.21495/71-0-97","DOIUrl":"https://doi.org/10.21495/71-0-97","url":null,"abstract":"In this paper, an implementation of Split Hopkinson Pressure Bar (SHPB) and its modification Open Hopkinson Pressure Bar (OHPB) for testing of cellular structures is presented. Dynamic testing of materials with low mechanical impedance is very demanding in terms of achieving the requested experimental device performance. Key elements of the Hopkinson bar instrumentation that were successfully employed in dynamic testing of cellular materials are presented in this paper. Detailed overview of the strain-gauges instrumentation including our best practices for installation and noise reduction is provided. Information about the instrumentation of Hopkinson bar with high-speed cameras are also given. To demonstrate the performance of the proposed instrumentation some examples of a typical results are summarized in the text.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"2 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":"122004774","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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