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Study on Generation Mechanism of Radio-Wave Noise in High Speed Sliding-Contacts and Reduction Method

高速滑触头无线电波噪声产生机理及降噪方法研究

基本信息

批准号：
01550330
负责人：
FUJIWARA Osamu
金额：
$ 1.22万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

In preserving the electromagnetic environment along railways it is important to reduce the levels of electromagnetic noises caused by the discontact phenomenon between the pantograph and trolley wire. However no effective measures for the noise reduction have been available at the present time because of the complexities of the discontact phenomenon. If this phenomenon could be elucidated using the sliding-contacts which is well-known as an experimental model of the pantograph current-collection system, it is possible to find out drastic means for suppressing the radio-frequency noises. In this study the discontact parameters were introduced for quantifying the occurrence situations of the mechanical discontact and electrical discharge appearing in the sliding-contacts, and through statistical measurements of these parameters attempt was made to elucidate the complex discontact phenomenon. The following results were obtained : As for the discontact parameters both the occurrence time-r … More ates of the discontact and discharge were used and simultaneous measurements of the above parameters were conducted using the brass sliding-contacts and the newly developed equipment with a personal computer. As a result it was found that both the discontact and discharge rates fluctuate approximately according to the normal probability distributions and when the sliding-speed and contact load are kept constant the discontact rate decreases with increasing the contact current, while the discharge rates increase, and also that the sum of the occurrence time-rates of the discontacts and discharges does not depend upon the contact current and this value unexpectedly agrees with the mechanical discontact rate without the contact current. Among the above results the inherent relationship holding between the discontact and discharge rates was also confirmed in the carbon sliding-contacts. It was, therefore, concluded that the discontact phenomenon can be quantified by the inherent properties described above. At present measurements of the occurrence frequencies of the discontact and discharge are conducted for investigating the properties peculiar to the sliding-contacts. Less

为了保护沿着的电磁环境，降低由受电弓和电车线之间的脱离现象引起的电磁噪声水平是重要的。然而，由于分离现象的复杂性，目前还没有有效的降噪措施。如果可以使用作为受电弓集电系统的实验模型而公知的滑动接触来阐明这种现象，则可以找到用于抑制射频噪声的激烈手段。在这项研究中，脱离参数被引入量化的发生情况下出现的机械脱离和放电的滑动接触，并通过这些参数的统计测量试图阐明复杂的脱离现象。结果表明：对于脱层参数，脱层发生时间-r ...更多信息使用断开和放电的状态，并且使用黄铜滑动触点和新开发的具有个人计算机的设备来进行上述参数的同时测量。结果表明，在滑动速度和接触载荷一定的情况下，随着接触电流的增大，脱接率减小，而放电率增大，脱接率和放电率均近似服从正态概率分布。以及发生时间的总和-断开和放电的速率不依赖于接触电流，并且该值出乎意料地与没有接触电流的机械断开速率一致。在上述结果中，在碳滑动触头中也证实了断开与放电速率之间的内在关系。因此，可以得出结论，可以通过上述固有特性来量化脱离现象。目前，为了研究滑动接触所特有的特性，对分离和放电的发生频率进行了测量。少