利用希尔伯特变换技术，将含故障的轴承振动信号转化为窄带振动包络信号．然后用包络信号的功率谱和沃尔什列谱对轴承故障进行诊断．对５套３０７轴承的诊断结果表明，这种方法诊断结果准确可靠，方法简便实用，速度快，特别适用于滚动轴承故障的在线监测与诊断 Using Hilbert transform technology, the fault bearing vibration signal is transformed into the narrowband vibration envelope signal. Then the power spectrum and Walsh spectrum of the envelope signal are used to diagnose the bearing faults. The diagnostic results of 5 sets of 307 bearings show that this method is accurate and reliable diagnostic results, the method is simple and practical, fast, especially suitable for rolling bearing fault on-line monitoring and diagnosis