基于小波分析的工程信號(hào)調(diào)制解調(diào)方法及其應(yīng)用
DEMODULATING METHODS BASED ON WAVELET ANALYSIS AND THEIR APPLICATION TO ENGINEERING SIGNALS
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摘要: 該文從工程應(yīng)用角度出發(fā),以信號(hào)漸進(jìn)性為基礎(chǔ)分析了Hilbert變換解調(diào)、小波變換多尺度解調(diào)和小波脊提取等3種信號(hào)解調(diào)方法的實(shí)用算法、應(yīng)用特點(diǎn)和局限性。文中通過(guò)一個(gè)結(jié)構(gòu)振動(dòng)分析的工程應(yīng)用實(shí)例,討論了利用漸進(jìn)小波分析方法同時(shí)獲取信號(hào)調(diào)幅、調(diào)頻信息的解調(diào)方法的優(yōu)越性及其應(yīng)用問(wèn)題。
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關(guān)鍵詞:
- 工程診斷; 解調(diào); 小波分析
Abstract: This paper, taking a view of engineering application and based on the asymp-lotics of signals, analyses practical algorithms and features and limitations in practice of three signal demodulation methods: Hilbert transform method, wavelet based multi-scales method, and asymptotic wavelet ridge extraction method. The advantage and practice problem of the asymptotic wavelet analysis approach, in obtaining the amplitude and frequency modulating information simultaneously, are illustrated with an authentic example of structure vibration analysis. -
P.D. McFadden, Detecting fatigue cranks in gears by amplitude and phase demodulation of the meshing vibration, ASME, Journal of Vibration, Acoustics, Stress and Reliability in Design, 1986, 108(5), 165-170.[2]樊可清,基于回轉(zhuǎn)振動(dòng)信號(hào)的機(jī)械診斷技術(shù)研究:[博士論文],西安,西安交通大學(xué),1998,4 ［3］N. Delprat, B. Escudie, P. Guillemain, R. Kronlandartinet, P. Tchamitchian, B. Torresani, Asymptotic wavelet and gabor analysis, extraction of instantaneous fiequencies, IEEE Trans, on Information Theory, 1992, IT-38(2), 644-664.[3]張緒省,朱貽盛,成曉雄等,信號(hào)包絡(luò)提?。邚南柌刈儞Q到小波變換,電子科學(xué)學(xué)刊,1997,19(1), 120-123. -
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