依据直升机旋翼不平衡故障空间与多点机体振动空间存在一对一映射关系的理论,采用某旋翼试验台设置桨距不平衡、质量不平衡以及后缘调整片不平衡的方法获取试验数据。利用小波变换和神经网络处理直升机机体振动信号,并对直升机旋翼单故障和复合故障进行诊断。最终实现了一种利用小波变换处理机体振动信号诊断旋翼不平衡故障的方法。 According to the theory of one-to-one mapping between helicopter rotor unbalanced fault space and multi-point body vibration space, experimental data are obtained by using a rotor test rig to set the pitch imbalance, mass imbalance and unbalanced trailing edge adjustment piece. Helicopter body vibration signals are processed by wavelet transform and neural network, and single and compound helicopter rotors are diagnosed. Finally, a method to diagnose rotor imbalance fault using wavelet transform is proposed.