A way to improve stationary random loading identification accuracy

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (16) : 176-181.

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A way to improve stationary random loading identification accuracy

LIAO Jun1, JIANG Bingyan1, SHI Wei2

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Abstract

A condition number weighted average method is presented based on inverse pseudo-excitation method to reduce the identification error caused by the rank defect of the frequency response function matrix; simulation process is given to compare the result between the presented method and routine method. It proves the optimizing result by use of the method; experiments are designed to certify the feasibility of the algorithm, and achieve good results, and the ill-conditioning problem can be conquered to some extent. The condition number of FRF is used to choose the response measuring point ，it reduces the workload, and get a accurate result.

Key words

random vibration / loading identification / inverse pseudo-excitation method / ill condition for matrix / condition number.

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LIAO Jun;JIANG Bingyan;SHI Wei. A way to improve stationary random loading identification accuracy [J]. Journal of Vibration and Shock, 2013, 32(16): 176-181