Time-frequency representation based on time-varying autoregressive model with applications to non-stationary rotor vibration analysis

Sādhanā - Tập 35 Số 2 - Trang 215-232 - 2010
Zhang, Long1, Xiong, Guoliang2, Liu, Hesheng3, Zou, Huijun1, Guo, Weizhong1
1Mechanical Engineering School, Shanghai Jiao Tong University, Shanghai, P.R. China
2School of Mechanical and Electronical Engineering, East China Jiaotong University, Nanchang Jiangxi, P.R. China
3Department of Physics, Shangrao Normal University, Shangrao Jiangxi, P.R. China

Tóm tắt

A parametric time-frequency representation is presented based on time-varying autoregressive model (TVAR), followed by applications to non-stationary vibration signal processing. The identification of time-varying model coefficients and the determination of model order, are addressed by means of neural networks and genetic algorithms, respectively. Firstly, a simulated signal which mimic the rotor vibration during run-up stages was processed for a comparative study on TVAR and other non-parametric time-frequency representations such as Short Time Fourier Transform, Continuous Wavelet Transform, Empirical Mode Decomposition, Wigner-Ville Distribution and Choi-Williams Distribution, in terms of their resolutions, accuracy, cross term suppression as well as noise resistance. Secondly, TVAR was applied to analyse non-stationary vibration signals collected from a rotor test rig during run-up stages, with an aim to extract fault symptoms under non-stationary operating conditions. Simulation and experimental results demonstrate that TVAR is an effective solution to non-stationary signal analysis and has strong capability in signal time-frequency feature extraction.

Tài liệu tham khảo

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