Repressing the effects of variable speed harmonic orders in operational modal analysis
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- 作者：R.B. Randall ; b.randall@unsw.edu.au" class="auth_mail" title="E-mail the corresponding author ; M.D. Coats ; W.A. Smith
- 关键词：Operational modal analysis ; Variable speed ; Harmonic order repression ; Cepstral liftering
- 刊名：Mechanical Systems and Signal Processing
- 出版年：2016
- 出版时间：15 October 2016
- 年：2016
- 卷：79
- 期：Complete
- 页码：3-15
- 全文大小：4535 K
文摘
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Two cepstral methods for removal of variable speed harmonic orders compared.
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TSA shown not to work with speed variations of the order of 5–15%.
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Exponential liftering in time domain better than notch liftering in order domain.
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After cepstral lifter pre-processing, response signals produce good OMA results.
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OMA results compared with those for excitation by stationary random noise.