【摘 要】
：
The friction and wear properties of a contact strip in a contact strip rubbing against a contact wire were studied.A series of experimental tests on the vibration between the contact strip and contact
【机 构】
：
The college of nudear technology and automation engineering, Chengdu university of technology,Chengd
【出 处】
：
成都理工大学核技术与自动化工程学院六十周年校庆大会
论文部分内容阅读
The friction and wear properties of a contact strip in a contact strip rubbing against a contact wire were studied.A series of experimental tests on the vibration between the contact strip and contact wire were conducted on a high-speed block-on-ring tester under the conditions of electric current of 0 A and 250 A,sliding speed of 200~350 km/h and normal loads of 120 N.Scanning electron microscopy (SEM) and optical microscopy (OM) were used to observe morphology of the wom surfaces.Experimental results indicate that the vibration of the contact strip is aggravated with increasing sliding speed.In contrast with those without electric current, the friction coefficient of the strip against the contact wire decreases and the wear rate increases obviously with increasing sliding speed.With the increase of the sliding speed, the contact surface temperature between the strip and contact wire with electric current grows faster.The arc discharge becomes stronger and stronger with the sliding speed, which results in aggravated arc erosion wear on the surface of the strip.Delamination wear and arc erosion wear are two main wear mechanisms for the strip against contact wire with electric current of 250 A when the sliding speed is bigger than 250 km/h.
其他文献
针对低密度水泥浆所存在的减轻剂(漂珠、空心玻璃微珠等)价格昂贵、外加剂使用量大、与钻井液相容性较差等问题,借鉴泥浆转化为水泥浆(MTC)技术,直接以矿渣作为胶凝材料替代油井水泥配制固井液,并研究了配套的激活剂和缓凝剂.结果表明:矿渣固井液的密度在1.30～1.50g/cm3范围可调,具有成本低、失水量低、沉降稳定性良好、与钻井液相容性好、稠化时间线性可调、低温下强度发展迅速等优点.矿渣固井液适用温
油基钻井液在国内外的页岩气井和复杂深井钻井中应用广泛,但油基钻井液与固井水泥浆之间相容性差,二者掺混后会产生不同程度的接触污染,表现为混浆流变性能变差、混浆强度严重下降等.为探明油基钻井液对固井水泥浆的污染影响,实验研究了油基钻井液在不同掺混比例条件下对水泥浆流动度、稠化时间、抗压强度等应用性能的影响;同时结合冷冻干燥技术/环境扫描电子显微镜(ESEM)、X射线衍射(XRD)、热重分析(TG)、扫
针对常规隔离液不可固化,当顶替效率较低或不规则井段窝存钻井液时,界面易形成不可固化层,影响层间封隔质量的问题.本文研制了一套可固化隔离液体系,该体系密度在1.4～2.2g/cm3可调,沉降稳定性和流变性能良好,与钻井液、水泥浆掺混后具有良好的相容性和固化能力,能够有效提高第二界面胶结质量.实验结果表明,经可固化隔离液处理后的第二界面胶结强度可提高98％,SEM分析表明,泥饼与水泥浆能够良好胶结,从
目前国内缺乏成熟的油井水泥触变剂,已有触变剂常存在触变性不强,触变性对温度敏感,影响施工安全等问题,限制了其应用.本文针对以上问题,根据微观结构设计,将纳米技术与聚合物合成技术有机结合在一起合成了一种新型纳米基多功能触变剂BCJ-200S.实验结果表明,触变剂BCJ-200S可明显改善水泥浆的触变性,其触变性随温度升高不但没变弱反而会有所增强,且其使水泥浆保持较高触变性的同时可保证施工的安全性,对
经验不确定分布一致性检验是在不确定分布未知的情况下,利用专家经验数据对不确定分布进行推断的一种非参数检验方法,是不确定统计领域参数估计和回归分析的基础和前提.本文主要研究了几种专家经验不确定分布的一致性检验方法.首先,简述了不确定统计和专家经验数据的基本理论;其次,利用专家经验数据系统分析了两组专家的经验分布是否存在显著性差异的Mann-Whitney U检验法、Kolmogorov-Smirno
散裂中子源利用荷能质子轰击重核后产生高通量中子,慢化器是调控中子的关键部件.此前国际上用铆钉铆接镉皮和铝合金部件,存在慢化剂泄漏的潜在风险,同时,铆钉铆接处也给物理建模增加了难度.常规电镀的镀层厚度是微米级,在活性的铝合金上施加一层厚达1mm的镉镀层难度很大.本文介绍了铝合金上电镀厚镉的无氰电镀方法、参数.本文的技术已经成功地制造中国散粒中子源氢慢化器和水慢化器的耦合层.
A new local density and relative distance based spectrum clustering (LDRDSC) algorithm is proposed to solve multidimensional data clustering in this paper.The density spectra consider both redefined l
As a special type of wireless sensor network, the chain-type wireless sensor networks can be used to monitor narrow and long regions, such as roads, underground mine tunnels, rivers, bridges, etc.In t
Gold (Au) and silver (Ag) monometallic nanoparticles (MNPs) and Au-Ag composite nanoparticles (CNPs) were fabricated on silicon wafers by anneal de-wetting the corresponding thin films.The measured re
In order to improve space positioning accuracy of the Agile Wrist consisting of a modified spherical parallel manipulator, which will influence the result of the Collisions in a robotic mechanical tes