发布求助
文献互助 智能选刊 最新文献

Acta Mechanica Slovaca最新文献

筛选
英文 中文
FEM Modeling of Shear Cutting of Electrical Steel Sheets under Various Technological Conditions 不同工艺条件下电工钢板剪切的有限元模拟
Acta Mechanica Slovaca Pub Date : 2019-02-01 DOI: 10.21496/AMS.2018.031
J. Slota, Ľ. Kaščák, S. Kut
{"title":"FEM Modeling of Shear Cutting of Electrical Steel Sheets under Various Technological Conditions","authors":"J. Slota, Ľ. Kaščák, S. Kut","doi":"10.21496/AMS.2018.031","DOIUrl":"https://doi.org/10.21496/AMS.2018.031","url":null,"abstract":"Almost all electrical machine consists of the stator and rotor cores, which are made of stacked non-oriented electric steel sheets. Punching and blanking are the two commonly used shear cutting technologies. The efficiency and performance of an electrical machine depend on the magnetic properties of its magnetic core. The shear cutting process causes the formation of residual stresses in cut segments next to the cutting line from the non-oriented electrical sheet metal, resulting in increased iron losses. The extent of deterioration in the magnetic material properties depends on the amount of induced stresses, which is affected by the used process parameters during shear cutting and the mechanical properties of the electrical steel sheets. This paper focuses on the residual stresses induced by punching with different shear cutting conditions using finite element analysis. Influence of cutting clearance of the shear cutting tool on were observed.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127135956","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: 2
Rheological Properties of New and used Brake Fluids 新旧制动液的流变特性
Acta Mechanica Slovaca Pub Date : 2019-02-01 DOI: 10.21496/AMS.2018.034
M. Wójcik
{"title":"Rheological Properties of New and used Brake Fluids","authors":"M. Wójcik","doi":"10.21496/AMS.2018.034","DOIUrl":"https://doi.org/10.21496/AMS.2018.034","url":null,"abstract":"The operating as well as energy-efficiency criteria determine specific rheological parameters of car's fluids, including brake fluids. The aim of this paper is the determination of rheological properties of new and used DOT 3 brake fluid with the use of rotational cone-plate rheometer. The viscosity and flow curves of brake fluids were determined at ≈ 20oC and ≈ 80oC. The results of tests showed differences between new and used brake fluids. It was noted that used brake fluid was characterized by lower viscosity and higher density. The viscosity was constant in the whole range of a shear rate. Additionally, the decrease of viscosity with the increase of temperature was also observed. The linear dependence between shear rate and shear stress for both tested brake fluids was noted. The aforementioned relationship enables to classify both new and used brake fluids as Newtonian liquids.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128420796","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
Risks During the Production and use of the thin Steel Sheets as one of the Most Ecological Materials in Packaging Technology 薄钢板作为包装技术中最生态的材料之一，在生产和使用过程中的风险
Acta Mechanica Slovaca Pub Date : 2019-02-01 DOI: 10.21496/AMS.2018.035
E. Spišák, J. Majerníková
{"title":"Risks During the Production and use of the thin Steel Sheets as one of the Most Ecological Materials in Packaging Technology","authors":"E. Spišák, J. Majerníková","doi":"10.21496/AMS.2018.035","DOIUrl":"https://doi.org/10.21496/AMS.2018.035","url":null,"abstract":"Thin steel sheets, which surface is processed against corrosion with various coatings, are still being used nowadays for the production of various packages, mainly for the long-term storing of materials. These packages are required to be reliably functioning while not contaminating the inner content for the whole time. In practice, we often encounter the opinion that the packages from thin steel sheets have been in recent years substituted with the packages made from non-metal materials, mainly from plastic materials. However, from the recent statistical evaluation it is evident that the packages from thin steel sheets play a significant role in the production of packages. This contribution describes changes in the production of steel sheets during recent years and the influence of these changes on the final properties of thin sheets. Contribution also presents the examples of disruption of such packages from thin steel sheets and the analysis of such disruptions.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130253596","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
Microcellular Co-Extrusion Process and Selected Properties of Thin-Walled Products 微孔共挤工艺及薄壁制品性能选择
Acta Mechanica Slovaca Pub Date : 2019-02-01 DOI: 10.21496/AMS.2018.028
A. Tor-Świątek, Ľ. Dulebová
{"title":"Microcellular Co-Extrusion Process and Selected Properties of Thin-Walled Products","authors":"A. Tor-Świątek, Ľ. Dulebová","doi":"10.21496/AMS.2018.028","DOIUrl":"https://doi.org/10.21496/AMS.2018.028","url":null,"abstract":"The microcellular extrusion process takes place with the use of conventional technological line for extruding shapes and coatings under the changed processing conditions, such as temperature for particular zones of the plasticizing system and extruder head zones. The process differs from the conventional method with regard to the method of shaping the extruder product. In the conventional extrusion process, the plastic has a homogenous structure across the whole section, whereas during microcellular extrusion process the plastic, containing the input plastic and a special blowing agent, obtains a two-phase structure changing its structure into microcellular. One phase is solid and the other is microcellular. Microcellular phase is obtained by inserting the blowing agent into the input plastic during its manufacture. It takes place in the penultimate zone of the plasticizing system of the extruder under suitable process conditions which enable expansion of the blowing agent. Currently applied blowing agents have the form of gases and liquids (then they are inserted into the plasticizing system of the extruder by means of a special installation) but also powders and granulates inserted into the plasticizing system of the extruder together with the input plastic after previously mixing thereof. The article presents characteristics of the microcellular extrusion process and it describes selected research results of the process and microcellular extruder product properties.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"364 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115976922","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 Frictional Resistances of Deep Drawing Quality Steel Sheets in Bending Under Tension Test 拉伸弯曲试验中深拉优质钢板摩擦阻力的测定
Acta Mechanica Slovaca Pub Date : 2019-02-01 DOI: 10.21496/AMS.2018.029
T. Trzepieciński, H. Lemu
{"title":"Determination of Frictional Resistances of Deep Drawing Quality Steel Sheets in Bending Under Tension Test","authors":"T. Trzepieciński, H. Lemu","doi":"10.21496/AMS.2018.029","DOIUrl":"https://doi.org/10.21496/AMS.2018.029","url":null,"abstract":"Among many friction tests, the bending under tension (BUT) test simulates the frictional conditions on rounded edge of punch in deep drawing operations. The experimental evaluation of coefficient of friction value has been carried out using a special tribological simulator. Two friction conditions i.e. dry friction and lubrication were analysed. As a test material the deep drawing quality (DDQ) steel sheet commonly used in automotive industry was selected. The mechanical properties of the sheets were selected in the uniaxial tensile test. The experimental results show that the friction coefficient value is very stable after reaching a certain value of sheet deformation. It was found that an increase of rolls surface led to an increase of the sample elongation value at which exists the maximum effectiveness of lubricant. It was also observed that an increase of the amount of sample elongation decreases the sheet surface roughness and friction behaviour changes as a result of high contact pressure and plastic deformation of surface asperities.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121520689","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
Robotic snakes 机器蛇
Acta Mechanica Slovaca Pub Date : 2018-09-15 DOI: 10.21496/ams.2018.025
Ivan Virgala, Ľ. Miková, M. Kelemen
{"title":"Robotic snakes","authors":"Ivan Virgala, Ľ. Miková, M. Kelemen","doi":"10.21496/ams.2018.025","DOIUrl":"https://doi.org/10.21496/ams.2018.025","url":null,"abstract":"The paper deals with snake-like robots. There are several types of snake-like locomotions. Biological example – snake always select the best type of locomotion in accordance with terrain. Big manoeuvrability leads many teams to develop snake-like robots. These structures have many degrees of freedom and it is complicated to control them. Articulated bodies of these snake-like robots consist of segments. The paper deals with segment with one and two degree of freedom.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117236592","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: 5
The Application of Contours Comparison Methods for Matching Segmented Point Clouds 轮廓比较方法在分割点云匹配中的应用
Acta Mechanica Slovaca Pub Date : 2018-09-15 DOI: 10.21496/AMS.2018.024
A. Nikitin, T. Mazitov
{"title":"The Application of Contours Comparison Methods for Matching Segmented Point Clouds","authors":"A. Nikitin, T. Mazitov","doi":"10.21496/AMS.2018.024","DOIUrl":"https://doi.org/10.21496/AMS.2018.024","url":null,"abstract":"This paper is devoted to the application of methods for contours and shapes comparison of objects represented as two-dimensional point clouds obtained during segmentation of data from a laser scanning system. The methods considered allow estimating the displacement of objects in the field of view of the scanning system. Methods are considered on the basis of Euclidean distances, Hausdorff metrics, invariant moments and shape context.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"280 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121366110","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
The Analysis of the Numerical Price Forecasting Success Considering the Modification of the Initial Condition Value by the Commodity Stock Exchanges 考虑商品证券交易所修改初始条件值的数值价格预测成功分析
Acta Mechanica Slovaca Pub Date : 2018-09-15 DOI: 10.21496/AMS.2018.021
Marcela Lascsáková
{"title":"The Analysis of the Numerical Price Forecasting Success Considering the Modification of the Initial Condition Value by the Commodity Stock Exchanges","authors":"Marcela Lascsáková","doi":"10.21496/AMS.2018.021","DOIUrl":"https://doi.org/10.21496/AMS.2018.021","url":null,"abstract":"In mathematical models, for forecasting prices on commodity exchanges different mathematical methods are used. In the given paper the numerical model based on the exponential approximation of commodity stock exchanges was derived. The price prognoses of aluminium on the London Metal Exchange were determined as numerical solution of the Cauchy initial problem for the 1st order ordinary differential equation. To make the numerical model more accurate the idea of the modification of the initial condition value by the stock exchange was realized. The derived numerical model was observed to determine the success of the proposed modification by means of the distribution of the numbers of the forecasting terms with different error rate. Within the forecasting terms, in which the modification of the initial condition value by stock exchange occurred, the proposed strategy significantly improved the original forecasting. The largest forecasting problems within significant and rapid changes in price course were eliminated. The modification of the original model improved forecasting in each forecasting term where the initial condition drift occurred by reducing both the mean absolute percentage error of the forecasting term and the number of the prognoses with the absolute percentage error of at least 10 %.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127463647","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: 5
Dynamic Parameters Tuning Using Structural Dynamic Modification 基于结构动态修正的动态参数整定
Acta Mechanica Slovaca Pub Date : 2018-09-15 DOI: 10.21496/AMS.2018.020
M. Musil, René Havelka, O. Chlebo, F. Havelka, B. Hucko
{"title":"Dynamic Parameters Tuning Using Structural Dynamic Modification","authors":"M. Musil, René Havelka, O. Chlebo, F. Havelka, B. Hucko","doi":"10.21496/AMS.2018.020","DOIUrl":"https://doi.org/10.21496/AMS.2018.020","url":null,"abstract":"Significant vibration of construction components are unwanted and dangerous problems in the modern engineering. Nevertheless, undesirable levels of vibration can occur in already existing constructions. Therefore, additional modal and spectral parameter modification, to reach the desired vibration reducing, is required. This work presents structural dynamic modification methodology that allows the modal properties of a structure to be effectively changed. As the demonstration of this method, the example of a cantilever beam structure modified by aluminium foam layer elements was chosen. This example represents inertial, stiffness and damping modification aimed to tuning of modal and spectral parameters of the original structure.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"194 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126962482","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 Wastewater in the Frame of Circular Economy; Irrigation of Agricultural Lands 废水处理在循环经济框架下的应用农田灌溉
Acta Mechanica Slovaca Pub Date : 2018-09-15 DOI: 10.21496/ams.2018.027
Rita Kendrovics -Boda, Imre L. Biczó, Zoltán Juvanc
{"title":"Application of Wastewater in the Frame of Circular Economy; Irrigation of Agricultural Lands","authors":"Rita Kendrovics -Boda, Imre L. Biczó, Zoltán Juvanc","doi":"10.21496/ams.2018.027","DOIUrl":"https://doi.org/10.21496/ams.2018.027","url":null,"abstract":"A great number of examples for Circular Economy applications are knonw in the field of solid, recyclable waste treams. In this area a massive development can be adsorbed. Relativly fewer efforts are devoted to the reuse of liquid resources. But waste water treatment is a technology what could be also considered as a technology what is able to provide streams otherwise problematic and not valorized: nutrients for agricultural use. An example for that new concept is the reuse of waste water for irrigation. This application can reduce the water scarcity and so slow down the increasing demand for fesh and absolutely clean water.","PeriodicalId":135905,"journal":{"name":"Acta Mechanica Slovaca","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129502033","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
首页 上一页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信