接触线机械可靠性研究

Research on the Mechanical Reliability of Contact Line

研究目的:接触线是接触网的主要组成部分,在弓网接触压力作用下,接触线产生振动及磨耗,导致强度降低、应力增加,使其寿命缩短。为解决这一问题,对接触线可靠性进行研究。通过对机械类参数的分析与计算,提出相关建议,为接触网设计提供借鉴。研究结论:通过建立计算模型对接触线机械类参数(强度、工作张力、磨耗率、弓架次)与应力关系的分析与研究表明,接触线机械可靠性随列车运行速度、弓架次及磨耗率的增加而降低,随着接触线强度的增加、受电弓抬升力减小、接触线工作张力适当提高而增加。为此,在选择接触线时,应尽可能与受电弓滑板等因素相结合,降低磨耗率;接触线工作张力选择应根据弓网受流与可靠度综合考虑确定;在供电能力满足要求时,尽可能选择强度较高的接触线,以减少应力-强度干涉区域,进而提高接触线的可靠性。

Research purposes： The contact line is the major component of the Overhead Contact Systems （OCS）. It shakes and wears when interacting with OCS - pantograph. These will reduce contact line strength and increase its stress leading to a shorter life - span. To solve this problem, we study the contact line reliability. We proposed corresponding suggestions by analysis and calculation of mechanical parameters. This work generated some preliminary data for future OCS design. Research conclusions： We established a mathematical model between mechanical parameters （mechanical intensity, working tense,wear rate and the number of pantograph use） and stress for studying. We can draw conclusions that the contact line mechanical reliability will decrease when train running speed, the number of pantograph and wear rate increase; it will increase by increasing the contact line intensity, lowering the pantograph raising force and increasing the contact line working tense at a certain level. As a result, we should consider some factors such as pantograph slider to reduce wear rate when choosing the contact line. The contact line working tense should be determined by comprehensive consideration of the current - carrying between the contact line and pantograph and the reliability. When the traction power can meet the requirements, we should choose contact line with high intensity to reduce stress - strength interference area, and further increase the contact line＇s reliability.