借助振动测试和时间序列分析，对系统碰撞质量的时变性进行了分析。研究证明，碰撞质量在一个激振周期内不是常数，其变化主频率与激振频率相当；在一定的运转参数下，碰撞质量呈正负交变状态，其振幅随时间缓慢变化，在所给的条件下，这一缓变周期大约为激振周期的3倍 With the help of vibration test and time series analysis, time-varying of the collision quality of the system is analyzed. The results show that the collision mass is not constant within an excitation period, and its main frequency changes with the excitation frequency. Under certain operating parameters, the impact quality changes in a positive and negative direction, and its amplitude changes slowly with time. Of the conditions, this change cycle is about 3 times the excitation period