Modal parameter identification of structures under non-white noise ambient excitations using delay index based stochastic subspace identification method

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (8) : 71-76.

HU Yi-ding 1 LI Dan 2 REN Wei-xin 3 LI Zi-bing 4

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Abstract

In order to eliminate spurious modes caused by non-white noise ambient inputs, the augmented state space model is introduced to explain how the spurious modes arise in the identified structural modal parameters. For a kind of typical non-white ambient excitations, whose autocorrelation values are nonzeroes near the vertical axis, delay index based stochastic subspace identification method is proposed in this paper, by introducing delay index in the traditional stochastic subspace identification method. Numerical examples verify that this improved method could eliminate spurious modes due to non-white noise inputs, so as to relax the assumption of ambient excitations in traditional operational modal analysis methods.

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modal parameter identification of structures / non-white noise ambient excitations / stochastic subspace identification / delay index

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HU Yi-ding 1 LI Dan 2 REN Wei-xin 3 LI Zi-bing 4 . Modal parameter identification of structures under non-white noise ambient excitations using delay index based stochastic subspace identification method[J]. Journal of Vibration and Shock, 2015, 34(8): 71-76

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