Estimation of the instantaneous rotation speed using complex shifted Monet wavelets

被引:55
作者
Gryllias, Konstantinos C. [1 ]
Antoniadis, Ioannis A. [1 ]
机构
[1] Natl Tech Univ Athens, Sch Mech Engn, Machine Design & Control Syst Sect, Dynam & Struct Lab, GR-10682 Athens, Greece
关键词
Complex shifted Morlet wavelets; Condition monitoring; Instantaneous rotation speed estimation; FREQUENCY ESTIMATION; WIGNER DISTRIBUTION; SIGNALS; DEMODULATION; PWVD; PEAK;
D O I
10.1016/j.ymssp.2012.06.026
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The ability of the complex continuous wavelet transform (CCWT) to provide also an estimation of the instantaneous frequency of a signal, parallel to the estimation of the instantaneous amplitude of the signal, is proposed as an approach for the estimation of the instantaneous rotation speed of machinery. Complex shifted Morlet wavelets (CSMW) present a number of advantages. The concept of shifting the Morlet wavelet in the frequency domain allows the simultaneous optimal selection of both the wavelet center frequency and the wavelet bandwidth. In this paper it is shown that the recovery of the signal frequency can be performed accurately, without the requirement that the wavelet center frequency coincides to the signal frequency. Contrarily, the accurate recovery of the signal amplitude requires additionally this last condition. The algorithm is tested on two synthetic signals and four non-stationary experimental vibration signals, in an experimental fault test rig and in a motorcycle engine. The proposed instantaneous frequency estimation approach presents very good results and in comparison to the Hilbert Transform achieves a significantly lower RMSE. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:78 / 95
页数:18
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