变形摩擦元件对系统热弹性不稳定性的影响

The anti-symmetric thermoelastic instabilitymodel was developed to calculate the critical speed with the sliding condition of the perturbation fixed on friction components. The influence of material parameters such as elastic modulus and Poisson's ratio on thermoelastic stability of the friction system was studied. The model was verified by the finite element solution of Yi Yun-bo and Zhao Jianxin. The results show that the deformed discs have great influence on the process of shifting, however little effect on the creeping condition. Among the three kinds of friction discs, paper-based friction discs have the best thermoelastic stability, while the Cu-based friction discs are the worst. The critical speed increases with the increase of the specific heat, thermal conductivity of steel discs and thermal expansion coefficient of friction discs. On the contrary, the critical speed decreases with the increase of the other material parameters. Under the premise that the parameters of the separator discs remain unchanged, the stability of the friction system can be improved by decreasing the specific heat, Poisson's ratio, Young's modulus and thermal conductivity, meanwhile increasing the coefficient of the thermal expansion.