航空发动机双转子系统的拍振分析

 在双转子航空发动机中，由于转子系统不可避免地存在不平衡量，当两个转子的转速比较接近时，发动机会出现拍振现象，拍振将引起振动强度过大问题。对双转子系统的拍振进行了研究，分析了拍振的周期性、信号强度及其反向转子特性，阐明了拍振产生的机理和特征，并采用数值仿真和试验对拍振进行了定量分析和验证。研究表明，拍振与双转子转速差和不平衡量的相位因素有关，当转速差小于工作转速的20%时，双转子系统拍振信号的强度较大。

Research on Beat Vibration of Dual-rotor for Aero-engine

There is inevitable unbalance in the dual rotor system of the aeroengine, the beat vibration will occur to engine when two rotors are operating at approximately the same speed. The beat vibration will induce unacceptable level of vibration amplitude. The beat vibration is studied for a dual rotor system in this paper. Some features, such as the beat vibration periodicity, intensity of beats and counter rotating characteristic, are analyzed in order to disclose the mechanics and distinction of the beat vibration.