信号处理，故障诊断，能量法，自功率谱，互功率谱，时域、频域求解-Signal processing, fault diagnosis, energy method, since the power spectrum, cross power spectrum, time domain, frequency domain to solve

谐波分析 功率谱分析 交叉谱分析课程及例子-The harmonic analysis of power spectrum analysis courses and examples of the cross-spectral analysis

随机信号的统计特性测试,均值、方差，相关函数（包括自相关、互相关函数）、频谱及功率谱密度算法.-The statistical properties of random signal test, mean, variance, correlation function (including autocorrelation, cross-correlation function), spectrum and power spectral density algorithms.