摘要
在Lee研究的热弹性模型基础上,考虑了制动闸片厚度对热点产生的影响;确定了瞬态热传导方程和热弹性平衡微分方程的边界条件,得到了系统发生热弹性不稳定的临界速度表达式.计算结果表明:系统存在着临界扰动频率;系统的扰动指数增长率随速度近似呈线性变化;扰动在低导热系数的闸片材料内速度几乎为0;不同的扰动频率对临界速度和扰动指数增长率均有影响.
Based on the thermo-elastic model by Lee and Barber,the impact of brake-pad thickness on hot-spot is considered.By determining the boundary conditions of transit thermal conduction and thermoelastic equilibrium differential equations,the critical speed expression of thermo-elastic system instability is attained.It is found from computational results that the critical turbulent frequency exists,whereas the turbulence-index growth rate against speed varies almost linearly.The turbulence speed in the pad materials with low thermal conduction coefficient reaches nearly zero,whilst different turbulence frequencies impact the critical speed and turbulence-index growth rate.
出处
《中国工程机械学报》
北大核心
2015年第4期307-311,共5页
Chinese Journal of Construction Machinery
基金
国家自然科学基金资助项目(6100407)
关键词
盘式制动器
热弹性不稳定
扰动增长率
临界速度
扰动频率
disc brake
thermo-elastic instability
turbulence-index growth rate
critical speed
turbulence frequency
