中文说明：
计算每个IMF分量及最后一个剩余分量residual与原始信号的相关性;计算各IMF的方差贡献率;绘制FFT频谱
English Description：
The correlation between each IMF component and the last residual component and the original signal is calculated; the variance contribution rate of each IMF is calculated; the FFT spectrum is drawn