说明：  阐述Hilbert变换的定义及解调原理。工程应用的结果表明, 利用Hilbert技术从复杂的 振动信号中解调故障的调制信息, 进而判断出故障齿轮的部位, 是一种可靠的故障诊断方法
(On the definition of the Hilbert transform demodulation principle. The engineering application results show that the Hilbert technical failure of modulation information from complex vibration signal demodulation, and then identify the parts of the fault gear, is a reliable method of fault diagnosis)