IOP Conf. Series: Materials Science and Engineering最新文献_第8页

Some of the challenges of teaching multilevel classes and suggestions for how to deal with the situation 介绍了教学多层次课程的一些挑战以及如何应对这种情况的建议

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/144/1/012015

R. Demarcsek, L. Todea

引用次数: 1

The evaluation of the elasto-plastic behavior in case of the honed steel pipes subjected to variable internal pressure 变内压作用下珩磨钢管弹塑性性能的评价

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/2/022036

R. Steigmann, M. Stanciu, M. Szasz, I. Curtu, T. Sturzu, A. Savin

引用次数: 2

Calculus domains modelled using an original bool algebra based on polygons 使用基于多边形的原始bool代数建模微积分域

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/8/082011

E. Oanta, C. Panait, A. Raicu, M. Barhalescu, T. Axinte

{"title":"Calculus domains modelled using an original bool algebra based on polygons","authors":"E. Oanta, C. Panait, A. Raicu, M. Barhalescu, T. Axinte","doi":"10.1088/1757-899X/145/8/082011","DOIUrl":"https://doi.org/10.1088/1757-899X/145/8/082011","url":null,"abstract":"Analytical and numerical computer based models require analytical definitions of the calculus domains. The paper presents a method to model a calculus domain based on a bool algebra which uses solid and hollow polygons. The general calculus relations of the geometrical characteristics that are widely used in mechanical engineering are tested using several shapes of the calculus domain in order to draw conclusions regarding the most effective methods to discretize the domain. The paper also tests the results of several CAD commercial software applications which are able to compute the geometrical characteristics, being drawn interesting conclusions. The tests were also targeting the accuracy of the results vs. the number of nodes on the curved boundary of the cross section. The study required the development of an original software consisting of more than 1700 computer code lines. In comparison with other calculus methods, the discretization using convex polygons is a simpler approach. Moreover, this method doesn't lead to large numbers as the spline approximation did, in that case being required special software packages in order to offer multiple, arbitrary precision. The knowledge resulted from this study may be used to develop complex computer based models in engineering.","PeriodicalId":359151,"journal":{"name":"IOP Conf. Series: Materials Science and Engineering","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128897209","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

Research regarding wires elastic deformations influence on joints positioning of a wire-driven robotic arm 钢丝弹性变形对线驱动机械臂关节定位的影响研究

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/5/052006

C. Ciofu, G. Stan

{"title":"Research regarding wires elastic deformations influence on joints positioning of a wire-driven robotic arm","authors":"C. Ciofu, G. Stan","doi":"10.1088/1757-899X/145/5/052006","DOIUrl":"https://doi.org/10.1088/1757-899X/145/5/052006","url":null,"abstract":"In this paper, we present the influence of driving wires deformation on positioning precision of joints from an elephant's trunk robotic arm. Robotic arms driven by wires have the joint accuracy largely depending on wires rigidity. The joint moment of resistance causes elastic deformation of wires and it is determined by: manipulated object load, weight loads previous to the analyzed joint and inherent resistance moment of joint. Static load analysis emphasizes the particular wires elastic deformation of each driven joint from an elephant's trunk robotic arm with five degrees of freedom. We consider the case of a constant manipulated load. Errors from each driving system of joints are not part of the closed loop system. Thus, precision positioning depends on wires elastic deformation which is about microns and causes angle deviation of joints about tens of minutes of sexagesimal degrees. The closer the joints to base arm the smaller positioning precision of joint. The obtained results are necessary for further compensation made by electronic corrections in the programming algorithm of the elephant's trunk robotic arm to improve accuracy.","PeriodicalId":359151,"journal":{"name":"IOP Conf. Series: Materials Science and Engineering","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133458656","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 estimation of the pollutant emissions on-board vessels by means of numerical methods 船舶污染物排放的数值计算方法

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/8/082016

A. Jenaru, P. Arsenie, R. Hanzu-Pazara

{"title":"The estimation of the pollutant emissions on-board vessels by means of numerical methods","authors":"A. Jenaru, P. Arsenie, R. Hanzu-Pazara","doi":"10.1088/1757-899X/145/8/082016","DOIUrl":"https://doi.org/10.1088/1757-899X/145/8/082016","url":null,"abstract":"Protection of the environment, especially within the most recent years, has become a constant problem considered by the states and the governments of the world, which are more and more concerned about the serious problems caused by the continuous deterioration of the environment. The long term effects of pollution on the environment generated by the lack of penalty regulations, have directed the attention of statesmen upon the necessity of the elaboration of normative acts meant to be effective in the continuous fight with it. Maritime transportation generates approximately 4% of the total of the CO2 emissions produced by human activities. This paper is intended to present two methods of estimation of the gases emissions on-board a vessel, methods that are very useful for the crews which are exploiting them. For the determination and the validation of these methods we are going to use the determinations from the tank ship. This ship has as a main propulsion engine Wärtsilä DU Sulzer RT Flex 50 - 6 cylinders that develops a maximal power of 9720 kW and has a permanent monitoring system of the pollutant emissions. The methods we develop here are using the values of the polluting elements from the exhaust gases that are determined at the exit of the vessel from the ship yard, in the framework of the acceptance tests. These values have been introduced within the framework of a matrix in the MATHCAD program. This matrix represents the starting point of the two mentioned methods: the analytical method and the graphical method. During the study we are going to evaluate the development and validation of an analytical tool to be used to determine the standard of emissions aimed at thermal machines on ships. One of the main objectives of this article represents an objective assessment of the expediency of using non-fuels for internal combustion engines in vessels.","PeriodicalId":359151,"journal":{"name":"IOP Conf. Series: Materials Science and Engineering","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130118611","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

Research regarding the influence of driving-wires length change on positioning precision of a robotic arm 研究驱动线长度变化对机械臂定位精度的影响

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/5/052007

C. Ciofu, G. Stan

{"title":"Research regarding the influence of driving-wires length change on positioning precision of a robotic arm","authors":"C. Ciofu, G. Stan","doi":"10.1088/1757-899X/145/5/052007","DOIUrl":"https://doi.org/10.1088/1757-899X/145/5/052007","url":null,"abstract":"The paper emphasise positioning precision of an elephant's trunk robotic arm which has joints driven by wires with variable length while operating The considered 5 degrees of freedom robotic arm has a particular structure of joint that makes possible inner actuation with wire-driven mechanism. We analyse solely the length change of wires as a consequence due inner winding and unwinding on joints for certain values of rotational angles. Variations in wires length entail joint angular displacements. We analyse positioning precision by taking into consideration equations from inverse kinematics of the elephant's trunk robotic arm. The angular displacements of joints are considered into computational method after partial derivation of positioning equations. We obtain variations of wires length at about tenths of micrometers. These variations employ angular displacements which are about minutes of sexagesimal degree and, thus, define positioning precision of elephant's trunk robotic arms. The analytical method is used for determining aftermath design structure of an elephant's trunk robotic arm with inner actuation through wires on positioning precision. Thus, designers could take suitable decisions on accuracy specifications limits of the robotic arm.","PeriodicalId":359151,"journal":{"name":"IOP Conf. Series: Materials Science and Engineering","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130231157","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 application of virtual reality systems as a support of digital manufacturing and logistics 虚拟现实系统作为数字化制造和物流支持的应用

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/4/042017

G. Golda, A. Kampa, I. Paprocka

{"title":"The application of virtual reality systems as a support of digital manufacturing and logistics","authors":"G. Golda, A. Kampa, I. Paprocka","doi":"10.1088/1757-899X/145/4/042017","DOIUrl":"https://doi.org/10.1088/1757-899X/145/4/042017","url":null,"abstract":"Modern trends in development of computer aided techniques are heading toward the integration of design competitive products and so-called \"digital manufacturing and logistics\", supported by computer simulation software. All phases of product lifecycle: starting from design of a new product, through planning and control of manufacturing, assembly, internal logistics and repairs, quality control, distribution to customers and after-sale service, up to its recycling or utilization should be aided and managed by advanced packages of product lifecycle management software. Important problems for providing the efficient flow of materials in supply chain management of whole product lifecycle, using computer simulation will be described on that paper. Authors will pay attention to the processes of acquiring relevant information and correct data, necessary for virtual modeling and computer simulation of integrated manufacturing and logistics systems. The article describes possibilities of use an applications of virtual reality software for modeling and simulation the production and logistics processes in enterprise in different aspects of product lifecycle management. The authors demonstrate effective method of creating computer simulations for digital manufacturing and logistics and show modeled and programmed examples and solutions. They pay attention to development trends and show options of the applications that go beyond enterprise.","PeriodicalId":359151,"journal":{"name":"IOP Conf. Series: Materials Science and Engineering","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115149167","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: 8

MCCB warm adjustment testing concept 塑壳断路器温控调节测试概念

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/144/1/012014

Z. Erdei, M. Horgoş, A. Grib, D. Preradovic, V. Rodić

引用次数: 1

ZnO thin film as MSG for sensitive biosensor 用于灵敏生物传感器的ZnO薄膜味精

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/4/042030

N. Iftimie, A. Savin, R. Steigmann, D. Faktorova, I. Salaoru

引用次数: 2

Intelligent system of coordination and control for manufacturing 智能制造协调与控制系统

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/2/022008

E. M. Ciortea

引用次数: 1