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这次旅行源自我14年前在心底埋下的一粒种子,大学三年级我完成记述行程1500km的《铁马冰河入梦来》这篇文章的时候,就许下诺言,要骑摩托车“进军西藏、环游中国”。 相似文献
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为提高车辆系统振动响应的计算精度,基于刚柔耦合动力学理论,将轮对、构架和轨道均考虑为柔性体,建立了考虑多柔性因素的车辆-轨道耦合动力学模型,对比分析了轮轨间动态作用的振动特性,研究了多柔性因素下的轮轨接触动态性能和运行平稳性能。结果表明:多柔性因素下,车轮振动加速度在垂向上有较大变化,柔性部件的横向运动出现"错位";各项动力学指标均有变化;车体加速度在垂向上最大增幅为36.7%,而横向上却与线路半径有一定的关系;横向上,多柔性因素下车体Sperling指数降低,降幅为9.5%,而垂向上该指数却增高16.6%。 相似文献
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The degradation of crosslinked polyethylene (XLPE) cable insulation during service, such as thermo-oxidation and water treeing may lead to a premature electrical breakdown of the XLPE insulation cables. Therefore, it is necessary to optimize the period of replacement to evenly distribute the replacement cost by ascertaining the deterioration degree. Estimation of the aging degree is at present the most important task for diagnosis of the residual lifetime of the power cable insulation. This paper presents a study on the changes in the dielectric properties of the thermally aged XLPE cables in the frequency range from 0.07~10 MHz. Based on electrical and physicochemical characterization, some new "dactylograms" for the thermally aged XLPE cable insulation have been proposed. 相似文献
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介绍在电气化铁路不中断行车、不排迁电力接触网的情况下 ,为在铁路线两侧开挖深基坑 ,施作防护行车线路用的护壁桩的施工工艺 相似文献
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