制动盘材料和结构对滑动摩擦系统热弹性失稳的影响

doi:10.13229/j.cnki.jdxbgxb201604023

摘要/Abstract

摘要： 建立了滑动摩擦系统热弹性失稳的数学模型,并推导了不同热点模式对应的临界速度表达式。分析了摩擦副的厚度和滑动层材料的热物理特性参数对摩擦系统热弹性失稳的影响。结果表明:滑动摩擦系统更易出现反对称分布的热点模式;增加摩擦层厚度,减小滑动层厚度、热传导系数、弹性模量以及热膨胀系数均可以提高标志滑动摩擦系统进入热弹性失稳状态所需的最低临界速度,而滑动层比热容对系统的稳定性几乎没有影响。

关键词: 机械设计, 扰动增长系数, 热弹性失稳, 最低临界速度, 扰动频率, 热点

Abstract: First, a mathematical model related to the thermoelastic instability was established, and the critical speeds of two different types of distribution of hot spots were derived. Then the effects of the thickness of the brake pair and thermal-physical properties of the sliding layer on the stability of the sliding frictional systems were analyzed and compared. Results show that, the sliding frictional system is more vulnerable to have dissymmetrical mode of hot spots. The minimum critical speed, which denotes the threshold of thermoelastic instability of the sliding frictional system, can be enhanced by increasing the thickness of the frictional layer and decreasing thickness, thermal conductivity, thermal expansion coefficient and elastic modulus of the sliding layer. However, the specific heat of the sliding layer almost has no influence on the stability of the sliding frictional system.

Key words: mechanical design, growth rate of perturbation, thermoelastic instability, minimum critical speed, wave number, hot spot

中图分类号:

TH117

夏德茂, 奚鹰, 华滨滨, 周亚红, 左建勇. 制动盘材料和结构对滑动摩擦系统热弹性失稳的影响[J]. 吉林大学学报(工学版), 2016, 46(4): 1163-1174.

XIA De-mao, XI Ying, HUA Bin-bin, ZHOU Ya-hong, ZUO Jian-yong. Effect of geometry and material properties of brake disc on thermoelastic instability of sliding frictional system[J]. 吉林大学学报(工学版), 2016, 46(4): 1163-1174.

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