变 转 速 轴 承 故 障 诊 断 的 无 转 速 阶 频 谱 分 析 方 法

For the fault diagnosis of variable speed bearings，order-frequency spectral correlation（OFSC）is capable of effectively revealing fault characteristics of variable-speed bearings，but this method requires speed as essential information. To address this issue，a novel order-frequency spectrum independent of rotational speed analysis method based on the generalized transient-squeezing transform （GTST） is proposed for the fault diagnosis of rolling bearings. Firstly，the method constructs a time-frequency representation of the envelope of the vibration signal through time-frequency analysis，and the energy concentration of time-frequency graph is enhanced using the generalized transient squeezing. Subsequently，the instantaneous frequency of the vibration signal is obtained by ridge line extraction，and the speed information is inferred. Finally，the obtained speed information and vibration signals are used for OFSC and enhanced envelope order spectrum（EEOS）analysis for the detection of bearing faults. The accuracy and reliability of the proposed method are validated through simulations and experimental tests.