VMD方法能够使一个多频带的故障信号，分解出具有单个频带的子信号，然后使用共振解调方法可实现故障信号的诊断。(The VMD method can make a multi band fault signal decompose the subsignal with a single frequency band, and then use the resonance demodulation method to realize the diagnosis of the fault signal

双树复小波matlab工具包，能够有效的对非平稳信号进行分解，具有良好的平移不变性(Dual-tree complex wavelet matlab toolkit, can effectively decompose non-stationary signals, with good translation invariance)