中文摘要：

在轨道车辆液压减振器开发过程中,通常会存在由于减振器泄漏等原因,导致其在低频阶段阻尼力值过低而无法满足技术要求的情况。为了研究减振器在低频阶段泄漏产生的原因及其对阻尼力值的影响力程度,通过改变导向套与活塞杆间隙、活塞表面与阀片贴合度及支撑环形式等的试验对比,研究其对减振器泄漏程度所造成的低频阶段阻尼力值的变化。试验结果表明,导向套与活塞杆间隙、活塞表面与阀片贴合度对减振器低频阻尼特性有较大的影响,而受活塞支撑环的影响相对较小,导向套与活塞杆间隙主要作用于液压减振器的复原行程内。

英文摘要：

In the development process of hydraulic shock absorbers for rail vehicle,there usually exists a situation that the damping force value is too low to meet the technical requirement due to the leakage of the shock absorber.In order to explore the causes of the shock absorber＇s leakage at the low frequency stage and their influence on the damping force values,the article proposes the experimental comparison of changing the gap between the guide sleeve and the piston rod,the fit between the piston surface and the valve plate,and the support ring form to study how different leakage levels of the shock absorber affect the damping force values at thelow frequency stage.The experimental results show that the gap between the guide sleeve and the piston rod,which mainly functions in the rebound stroke of the hydraulic shock absorber,the fit between the piston surface and the valve plate have great influences on low frequency damping characteristics of the shock absorber while effect of the piston support ring is dwarfed,the guide sleeve and piston rod gap.