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Engineering Mechanics 2020最新文献

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COMPUTATION OF AERODYNAMIC OF STRUT-BRACED WING 支撑翼气动计算
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-202
P. Hospodář, V. Hanzal, A. Drábek
{"title":"COMPUTATION OF AERODYNAMIC OF STRUT-BRACED WING","authors":"P. Hospodář, V. Hanzal, A. Drábek","doi":"10.21495/5896-3-202","DOIUrl":"https://doi.org/10.21495/5896-3-202","url":null,"abstract":": This article deals with the computation of aerodynamic characteristic of strut-braced wing. Calculations were performed on L-610 airplane with two proposals of wing with the different aspect ratio. Results of these calculations were compared with the original wing of the L-610. Aerodynamic characteristics serve as the basis for the structure analysis and are used for analyses of flight performance.","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":"115168222","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 SUITABLE ASYMPTOTIC COURSES OF METEO-BALLISTIC WEIGHTING FACTOR FUNCTIONS FOR SENSITIVITY ANALYSIS OF PERTURBED PROJECTILE TRAJECTORIES 为扰动弹丸轨迹敏感性分析设计合适的气象-弹道加权因子函数渐近路线
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-440
O. Rozehnal, V. Čech
{"title":"DESIGN OF SUITABLE ASYMPTOTIC COURSES OF METEO-BALLISTIC WEIGHTING FACTOR FUNCTIONS FOR SENSITIVITY ANALYSIS OF PERTURBED PROJECTILE TRAJECTORIES","authors":"O. Rozehnal, V. Čech","doi":"10.21495/5896-3-440","DOIUrl":"https://doi.org/10.21495/5896-3-440","url":null,"abstract":": This paper is a free continuation of the paper at Engineering Mechanics 2014 by Čech, Jevický and Jedlička. In practice, various relationships are used to sensitivity analysis the effect of meteo conditions on the uncontrolled projectile trajectory, all of which are derived from the corresponding Weighting Factor Functions - WFFs. One of the ways to analyze the influence of the trend of meteo conditions on the projectile trajectory is the use of simplified - asymptotic courses of WFFs. Thus, for example, Weighting Factors - WFs for STANAG 4061 were created in this way. In the article, we deal with the analysis of the properties of one group of asymptotic WFFs, which is suitable for surface-to-surface fire and the effect of wind on the projectile trajectory with altitude up to cc. 10 km (range up to cc. 30 km) and virtual temperature up to altitude cc. 6 km (range up to cc. 20 km). From the given WFFs, the corresponding systems of WFs are easily calculated. At the same time, we present the relations for the calculation of the Reference Height of projectile trajectory, which is given in the tabular firing tables according to the Soviet methodology.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"3 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":"127837003","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
COMPARING NUMERICAL AND EXPERIMENTAL SOLUTIONS OF FRICTION STIR WELDING OF AN ALUMINIUM PLATE 铝板搅拌摩擦焊接数值解与实验解的比较
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-226
R. Janco, P. Élesztős, L. Écsi, P. Šlesar
{"title":"COMPARING NUMERICAL AND EXPERIMENTAL SOLUTIONS OF FRICTION STIR WELDING OF AN ALUMINIUM PLATE","authors":"R. Janco, P. Élesztős, L. Écsi, P. Šlesar","doi":"10.21495/5896-3-226","DOIUrl":"https://doi.org/10.21495/5896-3-226","url":null,"abstract":": Friction Stir Welding (FSW) is one of the most effective solid state joining processes and has numerous potential applications in many industries. The aim of this paper is to describe an experimental method of measuring the thermal field during the FSW and compare it to the thermal-fluid simulation of FSW using the finite element method in program SYSWELD. The thermal results from the numerical simulation using SYSWELD are presented for aluminum alloy.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"109 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":"134552319","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
IMPROVING CUTTING CAPABILITY OF PLASMA BEAM BY MODIFYING THE NOZZLE GEOMETRY SUPPLIED BY FEM 利用有限元法修正喷嘴几何形状，提高等离子束的切割能力
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-334
M. Málek, M. Mician
{"title":"IMPROVING CUTTING CAPABILITY OF PLASMA BEAM BY MODIFYING THE NOZZLE GEOMETRY SUPPLIED BY FEM","authors":"M. Málek, M. Mician","doi":"10.21495/5896-3-334","DOIUrl":"https://doi.org/10.21495/5896-3-334","url":null,"abstract":"","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"70 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113983187","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
SHAPE OPTIMIZATION USING A GENETIC ALGORITHM AND FINITE ELEMENT METHOD 采用遗传算法和有限元法进行形状优化
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-190
M. Hermann, T. Hruš, P. Kacálek
{"title":"SHAPE OPTIMIZATION USING A GENETIC ALGORITHM AND FINITE ELEMENT METHOD","authors":"M. Hermann, T. Hruš, P. Kacálek","doi":"10.21495/5896-3-190","DOIUrl":"https://doi.org/10.21495/5896-3-190","url":null,"abstract":": Our study examines an algorithm for searching ideal shapes of parts according to their functions and lifetime. Due to finite element method (hereinafter referred to as the „FEM“) we obtain maximal equivalent stress at critical part of component or maximum deformation. This is the value of fitness function for genetic algorithm, which is searching for ideal shape of part according to requirements. The goal of the research is to create a universal algorithm that can be used to optimize any component.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"8 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":"114257913","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
UNCERTAINTIES OF KINEMATIC AND DYNAMIC MODEL OF REDUNDANTLY ACTUATED PARALLEL MECHANISMS 冗余驱动并联机构运动学和动力学模型的不确定性
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-420
F. Prochazka, M. Valášek
{"title":"UNCERTAINTIES OF KINEMATIC AND DYNAMIC MODEL OF REDUNDANTLY ACTUATED PARALLEL MECHANISMS","authors":"F. Prochazka, M. Valášek","doi":"10.21495/5896-3-420","DOIUrl":"https://doi.org/10.21495/5896-3-420","url":null,"abstract":": The paper deals with modeling of redundantly actuated parallel mechanisms. A calculation method how to obtain a quantitative information about kinematic and dynamic model accuracy is presented. This method is based on utilization uncertain model parameters such as geometric and dynamic parameters with bounded deviations. The proposed method is tested on the parallel redundantly actuated planar 4RRR mechanism “Crosshead”. Finally obtained results are discussed.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"184 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":"114431966","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
PROBABILISTIC ANALYSIS OF MACHINE TOOL STRUCTURES FRAGILITY ON EXTREME SNOW IMPACT 极端积雪冲击下机床结构脆性的概率分析
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-302
J. Králik
{"title":"PROBABILISTIC ANALYSIS OF MACHINE TOOL STRUCTURES FRAGILITY ON EXTREME SNOW IMPACT","authors":"J. Králik","doi":"10.21495/5896-3-302","DOIUrl":"https://doi.org/10.21495/5896-3-302","url":null,"abstract":": This probabilistic assessment of NPP structures for Probabilistic Safety Analysis (PSA) level 2 of VVER 440/213 in the case of the extreme external even without the earthquake is presented. On the base of the meteorological monitoring of the locality, the extreme load parameters were defined for the return period 104 years using the Monte Carlo simulations. There is showed a summary of calculation models and calculation methods for the probability analysis of the structural resistance. The general purpose of the nonlinear probabilistic analysis of the NPP structure resistance was to define the safety level of the critical structural elements. The numerical simulations on the base of the LHS method were realised in the system ANSYS and FReET.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"150 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":"123226216","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
PROBABILITY LINEAR METHOD POINT CLOUD APPROXIMATION 概率线性方法点云逼近
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-306
J. Králík, V. Venglár
{"title":"PROBABILITY LINEAR METHOD POINT CLOUD APPROXIMATION","authors":"J. Králík, V. Venglár","doi":"10.21495/5896-3-306","DOIUrl":"https://doi.org/10.21495/5896-3-306","url":null,"abstract":": Fitting curves through point clouds is useful when the further computation is required to be fast or the data set is too large. The most common method to fit a curve into a point cloud is the approximation using the Least squares method (LSM) but it can be used only when the expected data have normal distribution. Data obtained from LIDAR often tend to have an error which can’t be solved by LSM, like data shifted in one angular direction. The main goal of this paper is to propose more efficient method for estimation of obstacle position and orientation. This method uses curve approximation based on probability; this can solve some classic errors that appear when processing data obtained by LIDAR. This method was tested and was found to have a disadvantage: great demand for computing power; its more than ten times slower than classic LSM and in cases with normal distribution gives the same results. It can be used in system where the emphasis is on accuracy or in multiagent solution when working with big data set is not desired.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"12 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":"121747770","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
CONCEPT OF METAMATERIAL WITH PIEZOELECTRIC ELEMENTS FOR CYBER-PHYSICAL SYSTEM APPLICATIONS 用于信息物理系统的压电元件超材料的概念
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-174
Z. Hadaš, P. Marcián, O. Rubeš, M. Hrstka
{"title":"CONCEPT OF METAMATERIAL WITH PIEZOELECTRIC ELEMENTS FOR CYBER-PHYSICAL SYSTEM APPLICATIONS","authors":"Z. Hadaš, P. Marcián, O. Rubeš, M. Hrstka","doi":"10.21495/5896-3-174","DOIUrl":"https://doi.org/10.21495/5896-3-174","url":null,"abstract":": This paper deals with a metamaterial for sensing purposes under Industry 4.0 applications. The presented of metamaterial is based on an auxetic structure which is made by Direct Metal Laser Sintering technology. The stain steel auxetic structure could integrate smart material elements or systems for electromechanical conversions. The proposed concept of metamaterial uses the auxetic structure with piezoelectric elements or stacks to transduce external load of structure into electric signal. The auxetic structure could provide uniform mechanical load on several smart piezoelectric elements in middle layers due to negative Poisson ration. The paper presents a FEM simulation of this concept and analysis of coupled electromechanical system under harmonic excitation. Deformation of auxetic structure with piezoceramic PZT plates is presented and the voltage response is analyzed. The assembly of metamaterial system with piezoelectric PVDF in case of soft application is also presented and it will be tested under future development.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"1 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":"129236469","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
STRENGTH ANALYSIS WITH WIND INFLUENCE ON A HYBRID MULTIMEDIA MOBILE SCENE 考虑风对混合多媒体移动场景影响的强度分析
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-326
M. Liss, T. Kałaczyński, N. Dluhunovych
{"title":"STRENGTH ANALYSIS WITH WIND INFLUENCE ON A HYBRID MULTIMEDIA MOBILE SCENE","authors":"M. Liss, T. Kałaczyński, N. Dluhunovych","doi":"10.21495/5896-3-326","DOIUrl":"https://doi.org/10.21495/5896-3-326","url":null,"abstract":": The mobile scene subjected to strength analysis is an extraordinary temporary building, whose endurance in relation to very high variability and diversity of operating conditions is the main theme of this study. The paper also presents the issue of analyzing this type of structure in design offices and in the light of applicable standards. Selected results of strength analysis carried out in CAD/CAE software were also presented.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"74 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":"128642813","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
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