Experimental validation of a fast dynamic load identification method based on load shape function

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (9) : 98-102.

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Experimental validation of a fast dynamic load identification method based on load shape function

Zhang Qing-xia1,3,4; Duan Zhong-dong2,3; Łukasz Jankowski4

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Abstract

A dynamic load identification method was introduced and complemented, in which the force was approximated using the shape functions from the finite element theory. The computational work is deduced a lot by calculating the weights of shape functions instead of indentifying the discrete load time history. It improves the performance of the deconvolution method in a long sampling time or high sampling frequency. Moreover, it improves the ill-conditioning of the inverse problem, and increases the robustness to noise. A numerical continuous beam compares and verifies that the load can be identified precisely by this method with 5% Gaussian noise pollution. In a cantilever beam experiment, via the measured structural responses, this method enables the online load identification which is performed repeatedly in a moving time window.

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structural health monitoring / load/force identification / deconvolution method / shape function / online identification

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Zhang Qing-xia;; Duan Zhong-dong; &#;ukasz Jankowski. Experimental validation of a fast dynamic load identification method based on load shape function[J]. Journal of Vibration and Shock, 2011, 30(9): 98-102