In order to process the non-stationary vibration signals such as speed up or speed down signals effectively,the order bi-cepstrum technique is presented.

• 针对齿轮箱升降速过程中振动信号非平稳的特点,将常规的阶次分析与倒双谱技术相结合,提出了基于阶次倒双谱的齿轮箱故障诊断方法。