On the application of correlation function matrices in OMA
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- 作者：Rune Brincker runeb@byg.dtu.dk" class="auth_mail" title="E-mail the corresponding author
- 关键词：Operational modal analysis ; Correlation function matrix ; Mode shape bias
- 刊名：Mechanical Systems and Signal Processing
- 出版年：2017
- 出版时间：15 March 2017
- 年：2017
- 卷：87
- 期：part_PA
- 页码：17-22
- 全文大小：332 K
文摘
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The paper revisits the analytical solution for the correlation function matrix of the random response of a structure.
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The derived solution is valid for a general system and general white noise input.
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The solution shows that the rows of the classical correlation function matrix is a free response of the system, but the columns are not.
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Using the columns of the classical correlation function matrix in operational modal analysis will introduce bias on the mode shape estimates.
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The bias errors when using the columns of the classical correlation function matrix is illustrated in a simulation study with closely spaced modes.