Pub Date : 2012-01-01DOI: 10.3969/J.ISSN.1001-4632.2012.01.14
Ren Xue-chong, Li Shengjun, Gao Kewei, Su Yanjing, Jiang Bo, Chen Gang, Z. Hai
The fracture toughness of high-speed wheel steel was measured at room temperature through compact tension(CT) specimens heat-treated with different procedures.Charpy V-notched impact specimens were made from the CT specimens with different fracture toughness,respectively.Impact tests were carried out on impact specimens at room temperature.The fracture toughness as well as the fracture surface and microstructure of impact specimens were observed and analyzed.Results show that the fracture toughness increases linearly with the increasing of impact toughness.The fracture modes of both CT specimens and impact specimens are mainly cleavage fractures.The inclusions in wheel steel mainly are Ti(C,N) which have little effect on the fracture toughness and impact toughness at room temperature.
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The primary characteristic of the operation system is the unbalanced status of arrival train flows in marshalling station on trunk lines with increased speed. Based on its operational requirements and characteristics, the theory of queuing and stochastic process is used to analyze quantitatively the condition of the operation system. The paper analyzes quantitatively the critical intensity arrival time of trains and the condition for appearance of saturation of declassification subsystem, efficiency and reliability of assembling subsystem and the critical intensity departing time of departure subsystem separately. The measures for improving the matching and coordinating relationship of operation system include setting inspector crews in declassification and departure subsystem in reason, the transit rate of section under 90% during trains arriving and departing intensively, reducing the coefficient of variance of arriving and departing time interval of the linking sections, adding de assembling locomotives and assembling locomotives during busy period, adding classification tracks and departure tracks, optimizing daily operation plan, optimizing operation scheme of train flows, keeping the operation system continuous and stable, increasing the percentage of wagons in transit without sorting, and so on.
{"title":"Research on the Matching and Coordinating Relationship of Operation System in Marshalling Station on Trunk Line with Increased Speed","authors":"Jun-qing Ye, Zhi-ya Chen, Xia-miao Li","doi":"10.1061/40932(246)401","DOIUrl":"https://doi.org/10.1061/40932(246)401","url":null,"abstract":"The primary characteristic of the operation system is the unbalanced status of arrival train flows in marshalling station on trunk lines with increased speed. Based on its operational requirements and characteristics, the theory of queuing and stochastic process is used to analyze quantitatively the condition of the operation system. The paper analyzes quantitatively the critical intensity arrival time of trains and the condition for appearance of saturation of declassification subsystem, efficiency and reliability of assembling subsystem and the critical intensity departing time of departure subsystem separately. The measures for improving the matching and coordinating relationship of operation system include setting inspector crews in declassification and departure subsystem in reason, the transit rate of section under 90% during trains arriving and departing intensively, reducing the coefficient of variance of arriving and departing time interval of the linking sections, adding de assembling locomotives and assembling locomotives during busy period, adding classification tracks and departure tracks, optimizing daily operation plan, optimizing operation scheme of train flows, keeping the operation system continuous and stable, increasing the percentage of wagons in transit without sorting, and so on.","PeriodicalId":35767,"journal":{"name":"中国铁道科学","volume":"1 1","pages":"2447-2452"},"PeriodicalIF":0.0,"publicationDate":"2007-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/40932(246)401","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58572920","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}
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