The improved power spectrum peak method applied in the modal identification field of the spatial lattice structure

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (9) : 10-15.

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The improved power spectrum peak method applied in the modal identification field of the spatial lattice structure

ZHANG Yi-gang 1, 2， LIU Cai-wei 1, WU Jin-zhi 1, PENG Tian-ming3

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Abstract

The traditional power spectrum density peak method is improved according to the feathers that the mode shape of the spatial lattice structures is dense .The average regularization power spectrum of all the test points is put forward, and on the basis of the characteristics of the mode shape in theory, and the above union sets are defined as the method of the modal identification results, besides, judgment criterion is discussed in this paper. The improved power spectrum density peak method can avoid the omission and overlapping of the identification of the frequency, the numerical example afterwards shows that the effect is good. A software is made based on the above theory and has been applied to the monitoring system of the stadium for Shenzhen Universiade.

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modal parameters identification / power spectrum density peak method / ambient excitation / The stadium for Shenzhen Universiade

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ZHANG Yi-gang;;LIU Cai-wei;WU Jin-zhi;PENG Tian-ming. The improved power spectrum peak method applied in the modal identification field of the spatial lattice structure[J]. Journal of Vibration and Shock, 2013, 32(9): 10-15