There is inevitable unbalance in the dual-rotor system of the aero-engine, the beat vibration will occur to engine when two rotors are operating at approximately the same speed.

• 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。