Wavelet Packet Decomposition for Bearing Fault Signals

Perform wavelet packet decomposition on bearing fault signals, reconstruct the frequency band signal with maximum energy, and calculate sample entropy for the reconstructed signal

Simulate Bearing Fault Signals by Constructing Bearing Fault Simulation Signals

Using MATLAB to simulate bearing fault signals by constructing bearing fault simulation signals, where the bearing's natural frequency fn=3000Hz, displacement constant y0=5, damping coefficient ξ=0.1, impact fault occurrence period=0.01s, sampling frequency fs=20kHz, and number of sampling points N=4096. Requirements: Construct bearing fault simulation signals based on the above conditions, plot their time-domain waveform and frequency spectrum diagram.