通风筋结构对盘式制动器颤振尖叫行为影响的仿真分析

Simulation analysis on the influence of the ventilation bar structure on the disc brake’s chatter and squeal behavior

针对现有的采用复特征值分析法研究制动盘结构变化对制动器颤振尖叫行为的影响,对比了复特征值分析法和瞬时动态分析法在计算盘式制动器颤振尖叫行为上的差异性,验证了瞬时动态分析法在求解制动器颤振尖叫问题上的实用性和可靠性。后基于瞬时动态分析法,研究了3种不同通风筋结构的制动盘在低速状态下对制动器稳定性的影响。研究发现,具有通风筋的制动盘在钳指侧能够有效降低制动器振动强度,尤其是具有螺旋形通风筋的制动盘,其在改善钳指侧振动强度方面效果突出。活塞侧由于约束较多且结构复杂,因此通风筋结构的制动盘在活塞侧并没有体现出明显的改善振动的效果。通过对摩擦过程中钳指侧和活塞侧制动片接触应力进行分析,很好地验证和解释了上述特征。以上结果也进一步证明了瞬时动态分析法结果的有效性及复特征值分析法结果的局限性。

Since the current complex eigenvalue analysis mainly focuses on the influence of structural changes of the brake disc exerted on the brake’s chatter and squeal behavior,this article compares the results based on the complex eigenvalue analysis and the transient dynamic analysis in terms of calculating the brake’s chatter and squeal behavior. It’s found that the transient dynamic analysis method has better practicality and reliability in solving the problems of the brake’s chatter and squeal.Then,the effect of three kinds of brake discs with different ventilation bar structures exerted on brake stability at a low speed is explored. It’s found that the brake disc with ventilation bars effectively reduces the brake’s vibration intensity on the finger side of the brake pad;in particular,the brake disc with spiral ventilation bars do a better job in this aspect. Since the piston side of the brake pad with more constraints is complex in structure,the brake disc with ventilation bars fail to achieve a desirable effect in improving the vibration intensity. These characteristics are verified by analyzing the contact pressure between the finger side and the piston side of the brake pad during the friction process. The results further prove that the results based on the transient dynamic analysis are effective while those based on the complex eigenvalue analysis are limited.