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Engineering Mechanics 2020最新文献

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SURFACE ROUGHNESS OF STRUCTURAL POLYMER MATERIALS AFTER MILLING 结构高分子材料铣削后的表面粗糙度
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-362
J. Musiał, R. Polasik, T. Kałaczyński, M. Szmajda
{"title":"SURFACE ROUGHNESS OF STRUCTURAL POLYMER MATERIALS AFTER MILLING","authors":"J. Musiał, R. Polasik, T. Kałaczyński, M. Szmajda","doi":"10.21495/5896-3-362","DOIUrl":"https://doi.org/10.21495/5896-3-362","url":null,"abstract":": The work was made to determine the technological conditions of milling of modern structural polymer construction materials due to the micro-geometrical structure of the machined surface (surface roughness). Wide spectrum of different type of modern structural polymer materials, used for toolmaking, prototyping and machine parts making application were machined. Five, commonly used, surface roughness parameters were specified, using MarSurf GD 120 PC - Based Roughness Measuring Unit. Original results of the experiment related to comparison of material and roughness with the use of two different milling tools were presented and discussed.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"90 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":"124402623","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
COMPUTATIONAL SIMULATION OF CAVITATION BUBBLE COLLAPSE 空化泡崩塌的计算模拟
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-094
R. Burda, P. Rudolf
{"title":"COMPUTATIONAL SIMULATION OF CAVITATION BUBBLE COLLAPSE","authors":"R. Burda, P. Rudolf","doi":"10.21495/5896-3-094","DOIUrl":"https://doi.org/10.21495/5896-3-094","url":null,"abstract":": Cavitation threatens lifetime of hydraulic machines, ship propellers or diesel injection nozzles, but can also serve as efficient way of pathogenic microorganisms eradication, water disinfection and chemical residuals removal. While classical Rayleigh-Plesset equation provides suitable 1D tool for description of the bubble behavior away from the wall, it suffers serious problems close to solid boundary due to its assumption of bubble sphericity during all stages of the bubble life. Therefore, a detail computational simulation based on RANS equations and multiphase Volume of Fluid approach was performed. Simulation was able to capture microjet, which deforms the bubble in solid wall vicinity, penetrates through bubble interior and is responsible for transformation from vapor bubble to vapor ring. It is important that numerical solution enabled detailed spatial description of the bubble evolution and allowed to distinguish between the pressure peaks caused by microjet impact on the wall and bubble collapse, thereby enhancing our understanding of the bubble collapse close to the solid boundary.","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":"116942731","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
MONITORING OF SELECTED PARAMETERS FOR GASOLINE VEHICLE WHILE USING THE TESTING SUBSTANCE IN LABORATORY CONDITIONS 汽油车在实验室条件下使用试验物质时选定参数的监测
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-218
J. Jablonicky, P. Feriancová, J. Tulík, M. Zastempowski, Ján Polerecký
{"title":"MONITORING OF SELECTED PARAMETERS FOR GASOLINE VEHICLE WHILE USING THE TESTING SUBSTANCE IN LABORATORY CONDITIONS","authors":"J. Jablonicky, P. Feriancová, J. Tulík, M. Zastempowski, Ján Polerecký","doi":"10.21495/5896-3-218","DOIUrl":"https://doi.org/10.21495/5896-3-218","url":null,"abstract":": The aim of the experiment was to carry out a research on the tested substance MPG BOOST in laboratory conditions. The MPG BOOST was tested on a Škoda Fábia 1.4 MPi with a combustion engine. The methodology of the experiment with the selection of suitable measuring and evaluation devices and with the characteristics of the measured object are specified in the experiment. The results of the paper include the evaluation of the measured values, their mutual comparison and the overall evaluation of the measurement results.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"83 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":"125167900","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
REINFORCED CONCRETE SLAB WITH SUBSOIL: NUMERICAL MODELLING AND EXPERIMENT 带底土的钢筋混凝土板:数值模拟与试验
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-342
Z. Marcalikova, M. Kozielová, M. Smirakova, R. Čajka
{"title":"REINFORCED CONCRETE SLAB WITH SUBSOIL: NUMERICAL MODELLING AND EXPERIMENT","authors":"Z. Marcalikova, M. Kozielová, M. Smirakova, R. Čajka","doi":"10.21495/5896-3-342","DOIUrl":"https://doi.org/10.21495/5896-3-342","url":null,"abstract":": The paper is focused on the issue of modelling reinforced concrete slab in the interaction with the subsoil. It is a specific task that includes the design of concrete structure and geotechnical analysis. The aim of the paper is to analyze the effects of parameters of subsoil in nonlinear analysis. Specifically, a parametric study for different subsoil depths and subsoil modulus of elasticity is elaborated. For numerical modelling, an experiment of the reinforced concrete slab with dimensions of 2000 x 2000 mm and thickness of 150 mm was chosen, which was tested on a specialized device at Technical University of Ostrava. The concrete slab is reinforced with steel reinforcement. Nonlinear analysis with utilization of finite element method is chosen to solve the 3D numerical model, where the fracture-plastic material model is chosen for concrete.","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":"125789884","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
TRANSMISSION ERROR OF THE SPIRAL BEVEL GEARS 螺旋锥齿轮的传动误差
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-138
Z. Fraňová, K. Řehák, A. Prokop
{"title":"TRANSMISSION ERROR OF THE SPIRAL BEVEL GEARS","authors":"Z. Fraňová, K. Řehák, A. Prokop","doi":"10.21495/5896-3-138","DOIUrl":"https://doi.org/10.21495/5896-3-138","url":null,"abstract":": This paper deals with the determination of the transmission error in spiral bevel gears and its minimization using tooth profile modification in order to reduce noise and vibration of transmission systems. Gears are the primary source of vibrations transmitted through the shaft and bearings to the gearbox housing and adjacent surfaces that emit noise to the surroundings. To increase the level of comfort and due to the legislative requirements, increasing emphasis is being placed on reducing the noise and vibrations of machine components, including transmission systems. This leads to the need to identify noise sources and evaluate them in terms of expected acoustic performance. The quality of the gear meshing can be evaluated by transmission error that is closely related to the noise and vibrations. To evaluate the quality of gears based on transmission error, experimental approaches are used that are costly and require quality equipment. Therefore, it is efficient to determine expected transmission error already at the design stage using numerical methods. In the presented paper, FEM software ANSYS is used for numerical simulation of the spiral bevel gear mesh and the obtained results were used to study the effect of tooth profile modifications on the transmission error.","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":"114253948","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 TRANSMISSION ERROR AT HELICAL GEAR 斜齿轮传动误差的测定
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-118
A. Czakó, K. Řehák, A. Prokop
{"title":"DETERMINATION OF TRANSMISSION ERROR AT HELICAL GEAR","authors":"A. Czakó, K. Řehák, A. Prokop","doi":"10.21495/5896-3-118","DOIUrl":"https://doi.org/10.21495/5896-3-118","url":null,"abstract":": This paper deals with the static transmission error issue, which is one of the measured parameters of vibration in gear pairs and transmission systems, which is connected to noise and vibration. The transmission error can be determined in several ways, including a technical experiment. However, due to time and financial reasons, this is not always possible, and therefore, the possibility of using numerical simulations is offered. In this paper, the approach using stress-strain quasi-static contact analysis using the finite element method in Ansys Workbench software is used. The advantage is, among other things, a good comparability of results. The input 3D CAD geometry is a helical gear pair, which was created fully parametrically, so that various configurations could be generated and analyzed, including the gear teeth modifications. The peak-to-peak value of the transmission error is the subject of evaluation, since it turns out as a significant cause of vibration. Based on the result, the presented approach with numerical simulation can be used as a very useful tool for comparison.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"4 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":"129194369","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
ANALYSIS OF MEASUREMENT OF TEMPERATURE DEPENDENCE INSIDE RUBBER SAMPLE UNDER DYNAMIC HARMONIC LOAD 动态谐波载荷下橡胶试样内部温度依赖性测量分析
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-476
P. Šulc, L. Pešek, V. Bula, P. Šnábl, J. Cibulka, J. Košina
{"title":"ANALYSIS OF MEASUREMENT OF TEMPERATURE DEPENDENCE INSIDE RUBBER SAMPLE UNDER DYNAMIC HARMONIC LOAD","authors":"P. Šulc, L. Pešek, V. Bula, P. Šnábl, J. Cibulka, J. Košina","doi":"10.21495/5896-3-476","DOIUrl":"https://doi.org/10.21495/5896-3-476","url":null,"abstract":": This work deals with the preparation and methodology of temperature measurement inside a rubber sample. In this paper, a rubber sample with temperature sensors is described and a description with a temperature measurement scheme under torsional dynamic stress with the possibility of measurement in a temperature chamber is proposed. Large torsional deformations are considered for harmonic torsional loads. The reason for these measurements is to determine the temperature dependence and sensitivity of the heat output parameters.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"867 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":"123955586","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 USING PASSIVE SAFETY SYSTEMS ON CHILD TRAUMA DURING A FRONTAL COLLISION 正面碰撞中使用被动安全系统对儿童创伤的影响
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-250
K. Joszko, A. Danecka, M. Burkacki, M. Gzik
{"title":"IMPACT OF USING PASSIVE SAFETY SYSTEMS ON CHILD TRAUMA DURING A FRONTAL COLLISION","authors":"K. Joszko, A. Danecka, M. Burkacki, M. Gzik","doi":"10.21495/5896-3-250","DOIUrl":"https://doi.org/10.21495/5896-3-250","url":null,"abstract":": The aim of this paper is the assessment of child’s position during a frontal crash. As part of this research, numerical tests were performed using Madymo software, where five different positions taken by a child during car travel were assessed. The research has shown that the child's position during a frontal collision has an impact on the injury criteria. However, passive safety systems are able to effectively protect young passengers from serious injuries. The study showed that positions taken while sleeping, playing with toys, or operating electronic devices are at a slightly higher risk of head, chest and neck injuries compared to the correct model position. A greater likelihood of injury was noted for two positions where the seat belt did not work optimally (there were noted a slipping of the dummy from under the hip belt or slipping of the shoulder belt, which led to increased activity of the belt around the child's abdomen). Tests indicate that the child may behave naturally while driving, but limit positions should be avoided, which may contribute to abnormal operation of passive safety systems.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"AES-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":"126509608","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
EFFECT OF RADIUS CHANGES OF MIDDLE CEREBRAL ARTERY (MCA) ON HEMODYNAMIC PARAMETERS 大脑中动脉半径变化对血流动力学参数的影响
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-536
W. Wolański, M. Sobkowiak-Pilorz, M. Ples, E. Kawlewska, W. Kaspera
{"title":"EFFECT OF RADIUS CHANGES OF MIDDLE CEREBRAL ARTERY (MCA) ON HEMODYNAMIC PARAMETERS","authors":"W. Wolański, M. Sobkowiak-Pilorz, M. Ples, E. Kawlewska, W. Kaspera","doi":"10.21495/5896-3-536","DOIUrl":"https://doi.org/10.21495/5896-3-536","url":null,"abstract":": The article describes the study of the influence of the change in the morphometric features of the middle cerebral artery, i.e. inlet and outlet branch diameters on the values of hemodynamic parameters occurring on the arterial wall – wall shear stress (WSS) and pressure. For numerical calculations ANSYS CFX software was used. A parametric model of the vessel was developed, based on actual anthropometric MCA measurements of patients. Three optimizations were performed by changing individual radius of the arterial branches. The aim of the study was to verify Murray's law for the lowest stress and pressure values. The optimal bifurcation angle calculated in the previous simulations was used.","PeriodicalId":383836,"journal":{"name":"Engineering Mechanics 2020","volume":"56 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":"130810411","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
SELF-HEALING TECHNOLOGY IN CONCRETE STRUCTURE DESIGN 混凝土结构设计中的自愈技术
Engineering Mechanics 2020 Pub Date : 1900-01-01 DOI: 10.21495/5896-3-198
I. Holly, I. Abrahoim, A. Ondák
{"title":"SELF-HEALING TECHNOLOGY IN CONCRETE STRUCTURE DESIGN","authors":"I. Holly, I. Abrahoim, A. Ondák","doi":"10.21495/5896-3-198","DOIUrl":"https://doi.org/10.21495/5896-3-198","url":null,"abstract":": In EU countries and worldly, concrete is the most widely used building material in the world because of its strength and durability, among its other benefits. Concrete also has a certain amount of limitations. They mainly include crack formation over a period of lifetime. Crack formation in reinforced concrete constructions may result to loss of their durability. Ingress water and chemicals can cause premature matrix degradation and corrosion of embedded steel reinforcement in concrete. Regular maintenance and repair of concrete structures is costly and, in some cases, not at possible. One of possible solution for prevention a costly repair, reduce maintenance and increase material durability might be an inclusion of an autonomous self-healing repair mechanism in concrete design technology. This paper describes some types of bacteria, used in self-healing concrete and their effects on different conditions in concrete on the basis of its properties like strength, durability, absorption of water, insertion of chlorides and others.","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":"114337043","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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