Accurate frequency domain measurement of the best linear time-invariant approximation of linear time-periodic systems including the quantification of the time-periodic distortions
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- 作者：E. Louarroudi ; elouarro@vub.ac.be" class="auth_mail ; R. Pintelon ; J. Lataire
- 关键词：Linear time-periodic (LTP) ; Nonparametric identification ; Frequency response function (FRF) ; Best linear time-invariant (BLTI) approximation ; Time-periodic (TP) distortions ; Floquet resonances
- 刊名：Mechanical Systems and Signal Processing
- 出版年：3 October 2014
- 年：2014
- 卷：48
- 期：1-2
- 页码：274-299
- 全文大小：14369 K
文摘
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A close connection exists between the BLTI approximation of an LTP system and classical FRF estimators.
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Traditional FRF measurements underestimate the higher order Floquet resonances in LTP systems.
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The dispersion of the cyclic variations is determined by the harmonic FRFs.
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The geometrical interpretation of the BLTI concept leads to the technique of vector FRF analysis.
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Successful demonstration of the theory on the emulated Mathieu oscillator.