中文说明： 最小二乘回归分析算法，pwm整流器的建模仿真，对信号进行频谱分析及滤波，数据模型归一化，模态振动，包括广义互相关函数GCC时延估计，能量熵的计算。
English Description：
Least squares regression analysis algorithm, the modeling and Simulation of PWM rectifier, the signal of frequency spectrum analysis and filtering, data normalization model, vibration modes, including generalized cross correlation function of GCC delay estimation, energy entropy calculation.