Rub-impact fault diagnosis of rotating machinery based on Hilbert-Huang transform

The rub-impact fault is one of the important faults of the rotating machinery. The rub-impact fault signal may be nonlinear and non-stationary. The Hilbert-Huang transform (HHT) is based on time-frequency signal processing technology, which is suitable for nonlinear and non-stationary signals. In this paper, the HHT transform is used to analyze the time-frequency characteristic of the rub-impact fault signal of a rotor test rig. The velocity sensor is used to measure the vibration signal of the rub-impact fault rotor. The experimental result shows that the HHT transform can effectively detect the rub-impact fault of the rotor, which implies great potential of the HHT transform in the fault diagnosis of rotor system.