Parameter identification of structure and TMD based on ambient vibration tests of the coupled system

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (10) : 193-198.

WEN Qing1,HUA Xugang2,WANG Xiuyong1,CHEN Zhengqing2,SUN Hongxin1

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Abstract

A method was proposed to identify the mass ratio and the natural frequencies and damping ratios of a structure - TMD coupled system based on ambient vibration tests.First, the discrete state matrix was estimated from ambient vibration tests by the stochastic subspace identification method.Then, it was transformed into the continued state matrix of the single degree-of-freedom’s structure and TMD coupled system.Final, the mass ratio, natural modal frequencies and damping radios were identified based on the continued state matrix.Numerical analyses were carried out and the results indicate that the method is reliable and suitable for multi-degree-of-freedom structures.The tests were performed on a laboratory set-up and the viability of the method and its suitability for real applications were assessed.

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Parameter identification / Structure and TMD coupled system / ambient vibration / stochastic subspace identification

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WEN Qing1,HUA Xugang2,WANG Xiuyong1,CHEN Zhengqing2,SUN Hongxin1. Parameter identification of structure and TMD based on ambient vibration tests of the coupled system[J]. Journal of Vibration and Shock, 2019, 38(10): 193-198

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