... bearing vibration signal is first decomposed into several intrinsic mode functions (IMFs) using variational mode decomposition (VMD). The IMFs that contain more noise information are selected using the Pearson correlation coefficient. Subsequently, discrete wavelet transform (DWT) is used to filter...

...). A discrete Fourier transform (DFT)-based curve fitting method was proposed in the power system to improve the accuracy and timeliness of mode identification of low-frequency oscillation. Intrinsic mode functions (IMFs) are obtained using VMD after low-pass filtering and the DC part with zero frequency...