论述了小波包分解及其能量谱处理五滚柱式定向离合器故障的原理与方法。应用小波包分解及其能量谱直观地识别出故障的特征频带，并进行了量化分析。结果表明，小波包及小波包分解能量谱比传统的傅立叶分析方法具有更大的优越性和价值。

The theory and method of wavelet packet decomposition and its energy spectrum dealing with the fault of the overrunning clutch are presented in the paper. The characteristic frequency band of the fault can be identified by wavelet packet decomposition and its energy spectrum conveniently. At the same time, quantification analysis is performed. The result has shown that this method is more advantageous and of practical value than traditional Fourier analysis method.