Vibration Fault analysis for rotor systems by using Hilbert spectrum

Abstract

The paper presents a relative novel time-frequency analysis method which applies in the vibration Fault analysis of rotor systems through Hilbert spectral analysis (HSA), the part of the Hilbert-Huang transform. Using this method we analyze the vibration fault characteristics of the rotor system with rub-impact by compared with non-rubbing rotor system both in experiment and simulation. Firstly, a single-span-two-disc test rig of rotor system with rub-impact at fixed limiter is established, and corresponding simulation model is built by finite element method (FEM). Then, system experimental and simulation signals at non-rubbing and rubbing condition are obtained based on the experiment and the FE model simulation, moreover which are analyzed by using HSA along with shaft center orbit method. The results show that the proposed method is effective in the vibration Fault analysis of rotor systems. Some conclusions are achieved which will be useful in the detection of rub-impact fault of rotor systems.