基于非稳态间断刹车的刹车盘寿命计算

Calculation of brake disk life based on unsteady discontinuous brake

针对外场刹车盘使用寿命普遍短于试验预测值的问题,通过刹车摩擦系数曲线,以真实碳刹车使用统计规律为区间,拟合非稳态间断刹车的摩擦系数曲线,并运用动力学原理计算单次刹停和非稳态间断刹停的磨损行程,根据磨粒磨损计算公式得出2种刹车方式下的磨损比为1∶1.899 7~1∶2.036 3,与外场统计结果 1∶1.88~1∶2.09相比,精度较高.计算中发现,在非稳态间断刹车过程中磨损工况变差是造成外场磨损加剧的主要原因,验证了连续刹车过程中形成的摩擦膜对减小磨损的重要作用.研究成果对于刹车寿命试验的改进和不同材料刹车盘外场寿命预测提供了一种理论计算的方法.

Focus on the problem that the actual service life of brake disks is always shorter than the cal- culated data underground test, made use of the friction coefficient curves and took the actual statistic using boundary of carbon brake disk to fit a friction coefficient curve of unsteady discontinuous brake. The wear distance of one and several brakes to stop is calculated by using dynamic theory, and the wear rate of the two different braking is 1： 1. 899 7 - 1： 2. 036 3 using the formula of abrasive wear, which is exact compared with the statistic result 1 ： 1.88 - 1 ： 2.09 in the airfield. The wear condition becoming worse in unsteady discontin- uous brake is the main reason leading to the wear speeding up of carbon brake disks fitting on the airplane. The important role of friction layer to reduce wear is proven and a calculation method is established to improve brake disks life test and estimate actual service lives of different-material brake disks by this study.