Effect of the unstable vibration of the disc brake system of high-speed trains on wheel polygonalization
Effect of the unstable vibration of the disc brake system of high-speed trains on wheel polygonalization
复制标题
高速列车盘式制动系统不稳定振动对车轮多边形化的影响
DOI：
10.1177/0954409719833787
复制
发表时间：
2020-01-01
影响因子：
2
通讯作者：
Ouyang, H.
中科院分区：
文献类型：
--
作者：
Wu, B. W.;Qiao, Q. F.;Ouyang, H.
通过数值模拟，对高速列车车轮多角化的形成机理及其影响因素进行了详细的研究。基于摩擦自激振动的观点，建立了包含两条钢轨、一个轮对和三个盘式制动单元的有限元模型，研究了高速列车车轮多角化的形成机理。采用有限元复分析方法，对轮对-轨道-盘式制动系统的动力稳定性进行了研究。此外，还对影响车轮多边形化的因素进行了研究。结果表明，当纵向蠕滑力不饱和时，由于盘式制动器单元的自激振动，车轮容易发生21阶多边形磨损。当纵向蠕滑力饱和时，由于盘式制动器的自激振动，车轮可能发生12阶多边形磨损。制动盘与摩擦片之间的摩擦系数越大，车轮发生多边形磨损的倾向越大。垂直紧固件的阻尼过大或过小都不利于抑制车轮的波纹。然而，增加横向紧固件的阻尼有利于减少车轮的多边形磨损。当垂直紧固件刚度为25 MN/m时，车轮容易发生7阶、9阶和14阶多边形化。较高的横向紧固件刚度有利于抑制车轮的多角化。
This paper conducts a detailed investigation into the formation mechanism of wheel polygonalization in high-speed trains and its influence factors through numerical simulation. A finite element model including two rails, one wheelset, and three disc brake units is set up to study the formation mechanism of wheel polygonalization in high-speed trains based on the point of view of frictional self-excited vibration. Using the finite element complex analysis, the dynamic stability of the wheelset–track–disc brake system is studied. In addition, the influence factors on the wheel polygonalization are investigated. Results show that when the longitudinal creep force is unsaturated, the 21-order polygonal wear of wheels occurs easily due to the self-excited vibration of the disc brake unit. When the longitudinal creep force is saturated, the 12-order polygonal wear of wheels probably occurs due to the self-excited vibration of the disc brake unit. The bigger the friction coefficient between the brake disc and pad, the greater the occurrence propensity of the polygonal wear of wheels. Vertical fastener damping that is too large or too small is disadvantageous for suppressing wheel corrugation. However, increasing the lateral fastener damping is beneficial for reducing the polygonal wear of wheels. When the vertical fastener stiffness is 25 MN/m, 7-order, 9-order, and 14-order wheel polygonalization can easily occur. A higher lateral fastener stiffness is beneficial for the suppression of wheel polygonalization.