线调频小波, 阶比跟踪, 角域平均, 能量算子解调, 齿轮轮齿裂纹故障诊断

Aiming at weak and hard to extract fault signals of gear tooth crack under varying rotate speeds, an order energy demodulating approach based on chirplet path pursuit was proposed and applied to the fault diagnosis of gear tooth crack under varying rotate speeds. In the proposed approach, the gear meshing frequency was acquired by chirplet path pursuit, and then the speed signals could be got. According to the speed signals,an even angle sampling was carried onto the raw signals to obtain angular domain stationary signals, then the bandpass filter and angular domain average were used to eliminate the influence of noise. At last, the instantaneous frequency and the instantaneous amplitude could be calculated by an energy operator demodulating, which was used to diagnose the fault of gear tooth crack. Application examples show that the proposed approach is an effective way to extract the fault feature of gear tooth crack under varying rotate speeds.