双摩擦块制动系统不同相对位置分布对stick-slip振动的影响  

Influence of different relative position distributions on the stick-slip vibration of a two friction blocks braking system

作　　者：刘翠萍 朱友光 项载毓 欧阳华江 莫继良[1] LIU Cuiping;ZHU Youguang;XIANG Zaiyu;OUYANG Huajiang;MO Jiliang(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学机械工程学院,成都610031

出　　处：《振动与冲击》2024年第22期217-224,269,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(12272324)。

摘　　要：利用定制试验装置,研究圆形双摩擦块不同相对位置分布对制动系统摩擦学行为和动力学行为的影响,并采用有限元方法分析了摩擦块表面接触应力分布特点,探讨了不同相对位置分布与界面接触行为、摩擦磨损以及stick-slip振动之间的关联。综合试验结果和仿真分析结果表明:双摩擦块制动系统不同相对位置分布显著影响了制动系统界面接触压力分布及摩擦块表面磨损特性,使系统产生不同形式的stick-slip振动。在该试验下,沿摩擦盘径向分布的两个摩擦块表面磨损轻微,接触压力分布相对均匀和具有较小的stick-slip振动幅度。因此,合理设计摩擦块间的排布可以有效抑制盘块摩擦界面stick-slip振动,减轻摩擦块的磨损,减小系统部件振荡,从而提高摩擦系统稳定性。研究结果对汽车和火车(特别是高速列车)制动器的设计有较重要的参考价值。The influence of relative positions of two circular friction blocks on the tribological behaviour and dynamic characteristics of a simplified and customized experimental braking system with a pads-on-disc configuration was studied.The contact stress distribution characteristics of the friction blocks were analyzed by using the finite element method,and the relationship between different relative positions and the interface contact behaviour,friction and wear,and stick-slip vibration was discussed.The results of the comprehensive test and simulation show that different relative positions of the two friction blocks significantly affect their interface contact pressure distribution and the wear characteristics,resulting in different forms of stick-slip vibration.It is found that the surface wear of the two friction blocks oriented along the disc radius is slight,the contact pressure is relatively evenly distributed and the stick-slip vibration intensity is low.It is also found that a sensible arrangement of friction blocks can effectively suppress the stick-slip vibration at the friction interface,mitigate the wear of friction blocks,reduce the oscillation of system components,and improve the stability of the friction system.The work contributes to an improved design of brakes for automobiles and trains(in particular,high-speed trains).

关 键 词：双摩擦块 stick-slip振动 相对位置 磨损 接触应力 

分 类 号：TH117.1[机械工程—机械设计及理论]