中文说明：
根据奇异值分解出来的奇异值，画出奇异值分布曲线，根据公式算出奇异值的突变点，此时突变点即是VMD分解分量数的K值。
English Description：
According to the singular value decomposed by singular value, the distribution curve of singular value is drawn, and the mutation point of singular value is calculated according to the formula. At this time, the mutation point is the K value of VMD decomposition component number