IOP Conf. Series: Materials Science and Engineering最新文献_第10页

Application of case-based reasoning for machining parameters selection 基于实例推理在加工参数选择中的应用

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/4/042011

C. Grabowik, K. Kalinowski, D. Krenczyk, I. Paprocka, W. Kempa

{"title":"Application of case-based reasoning for machining parameters selection","authors":"C. Grabowik, K. Kalinowski, D. Krenczyk, I. Paprocka, W. Kempa","doi":"10.1088/1757-899X/145/4/042011","DOIUrl":"https://doi.org/10.1088/1757-899X/145/4/042011","url":null,"abstract":"Process planning, as one of the most important stage of the technological production preparation, consists in selection of manufacturing operations taking into account the minimal manufacturing cost. The minimal manufacturing cost could be achieved by selection of the best sequence of manufacturing operations, machine tools, manufacturing tools, and accompanying machining parameters selection. On the other hand, it is almost impossible, especially in industrial conditions, to design an optimal process plan, first of all due to restrictions imposed by the installed in the factory machine park. Taking into consideration above, machining parameter selection seems to be one of the potential areas of optimization. In manual process planning process engineers select machining parameters using selection rules and data stored in manuals and tool catalogues. It makes this process time and labour consuming and non-error free. On the other hand, in workshop practice, machine operators select parameters having their skills and habits in mind. It could be a reason for suboptimal process planning. Considering this, new methods of machining parameters selection free of human factor influence are still sought. In our approach, we propose to apply case-based reasoning for machining parameter selection. In the paper, a detailed description of our approach is presented.","PeriodicalId":359151,"journal":{"name":"IOP Conf. Series: Materials Science and Engineering","volume":"11 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":"123965707","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

Multi-criteria evaluation methods in the production scheduling 生产调度中的多准则评价方法

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/2/022019

K. Kalinowski, D. Krenczyk, I. Paprocka, W. Kempa, C. Grabowik

引用次数: 7

Design check of an S-Lay offshore pipeline launching using numerical methods 基于数值方法的S-Lay海上管道下水设计校核

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/8/082017

L. Stan, I. Călimănescu, D. Velcea

{"title":"Design check of an S-Lay offshore pipeline launching using numerical methods","authors":"L. Stan, I. Călimănescu, D. Velcea","doi":"10.1088/1757-899X/145/8/082017","DOIUrl":"https://doi.org/10.1088/1757-899X/145/8/082017","url":null,"abstract":"The production of oil and gas from offshore oil fields is, nowadays, more and more important. As a result of the increasing demand of oil, and being the shallow water reserves not enough, the industry is pushed forward to develop and exploit more difficult fields in deeper waters. The purpose of this paper is to determine the optimum launching parameters of a subsea pipeline in S-Lay system using the software OffPipe. The offshore pipelines designing is an intricate enterprise following very demanding designing codes since at stake is the integrity of multi-million dollars investments in offshore oil and gas exploitation facilities. The case study of this paper is taken on purpose to show how the numeric analysis may help to detect potential problems that might occur during pipe launching with S-Lay method. In the analysed case the launching process is under control since all the launching parameters and stresses are well below the critical ones. In any event the numeric modelling of the process was demonstrated to be a valuable tool in the design engineer hands in order to assess the feasibility of any launching subsea pipe launching.","PeriodicalId":359151,"journal":{"name":"IOP Conf. Series: Materials Science and Engineering","volume":"268 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":"116831716","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

Method in calculating own vibration frequencies of open sections bars with thin walls 薄壁开截面杆自身振动频率的计算方法

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/4/042029

N. Mihuţ

引用次数: 0

Mechanically Alloyed High Entropy Composite 机械合金化高熵复合材料

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/7/072007

G. Popescu, M. M. Adrian, I. Csáki, C. Popescu, D. Mitrică, S. Vasile, I. Carcea

{"title":"Mechanically Alloyed High Entropy Composite","authors":"G. Popescu, M. M. Adrian, I. Csáki, C. Popescu, D. Mitrică, S. Vasile, I. Carcea","doi":"10.1088/1757-899X/145/7/072007","DOIUrl":"https://doi.org/10.1088/1757-899X/145/7/072007","url":null,"abstract":"In the last years high entropy alloys have been investigated due to their high hardness, high temperature stability and unusual properties that make these alloys to have significant interest. In comparison with traditional alloys that are based on two or three major elements, this new generation alloys consists at least of 5 principal elements, with the concentration between 5 and 35 at.%. The present paper reports synthesis of high entropy alloys (HEA) and high entropy composites (HEC) synthesized by mechanical alloying (MA). The equiatomic AlCrFeNiMn matrix was used for creating the HEA matrix, starting from elemental powders and as reinforcing material for composites was used pure graphite. The mechanical alloying process was carried out at different duration, in a high energy planetary ball mill, under argon atmosphere. The elemental powders alloying began after '5 hours of milling and was complete after 40 hours. The mechanical alloyed matrix and composite was pressed and heat treated under argon protection. The elemental powers were investigated for physical - technological properties, and by X-ray diffraction and scanning electron microscopy. Phase pressing operation was realized with a hydraulic press and the applied pressure was progressive. The sintering process was carried out at 850°C for 2 h. The X-ray diffraction revealed that the MA process resulted in solid solutions formation and also revealed body- centred cubic (BCC) and face-centred cubic (FCC) structures with average grain size around 40 nm. In addition, nanoscale particles were highlighted by scanning electron microscopy, as well as the homogeneity of the chemical composition of the matrix and composite that was confirmed by EDX microanalysis. It was noted that HEA matrix and HEA composites were processed with a high degree of compaction and with a quite large capacity of mixed powder densification (around 70%).","PeriodicalId":359151,"journal":{"name":"IOP Conf. Series: Materials Science and Engineering","volume":"8 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":"114951521","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: 4

Means of atmospheric air pollution reduction during drilling wells 钻井过程中减少大气污染的方法

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/144/1/012009

L. Shkitsa, T. Yatsyshyn, M. Lyakh, O. Sydorenko

引用次数: 12

Verification of forward kinematics of the numerical and analytical model of Fanuc AM100iB robot Fanuc AM100iB机器人正运动学数值分析模型的验证

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/5/052001

A. Cholewa, J. Swider, A. Zbilski

引用次数: 8

Sloping beach with wave breaking and moving shoreline on Romanian Black Sea coast 罗马尼亚黑海沿岸有波浪破碎和移动海岸线的倾斜海滩

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/8/082012

F. Panaitescu, M. Panaitescu, I. Anton

引用次数: 0

Improving FMEA risk assessment through reprioritization of failures 通过重新确定故障的优先级来改进FMEA风险评估

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/145/2/022004

A. Ungureanu, G. Stan

引用次数: 1

Mobbing in Bosnia and Herzegovina and the member states of the European Union 波斯尼亚和黑塞哥维那以及欧盟成员国的骚乱

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-01 DOI: 10.1088/1757-899X/144/1/012016

V. Rodić

{"title":"Mobbing in Bosnia and Herzegovina and the member states of the European Union","authors":"V. Rodić","doi":"10.1088/1757-899X/144/1/012016","DOIUrl":"https://doi.org/10.1088/1757-899X/144/1/012016","url":null,"abstract":"Mobbing as a specific form of discrimination which applies only to the labor law, is a very young branch of labor law. It began to develop during the eighties of last century. This kind of psychoterror that appears in the workplace, was first spotted, formulated and diagnosed by the Swedish psychologist of German origin prof. Dr. Heinz Lejman (Heinz Leymann July 17, 1932.; Wolfenbuttel, Germany - 1999 Stockholm, Sweden). Today, the legal regulation of mobbing in terms of prevention, rules of behavior and sanctions is indispensable to every modern democratic state. I'll make a comparison of the legislative regulation provided by BiH with several European Union member states. I will compare the results of a survey conducted by the European Foundation for the Improvement of Living and Working Condition, during the year 2000. In the European Union Member States, with the results of the questionnaire for employees, which I conducted in Bosnia and Herzegovina. The conclusion I came to in this paper is: Bosnia and Herzegovina is lagging behind a lot of European Union member states, both in terms of prevention of mobbing, as well as legislation, that is insufficient to regulate this complex issue. Results of the questionnaire for the employees that I conducted in Bosnia and Herzegovina are devastating and alarming.","PeriodicalId":359151,"journal":{"name":"IOP Conf. Series: Materials Science and Engineering","volume":"176 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":"116505912","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