Vibration-Based Damage Detection of Composite Wingbox Structures Using Improved Hilbert-Huang Transform

Abstract:

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A vibration-based approach to detect crack damage in a cantilever composite wingbox is studied using the improved Hilbert-Huang Transform (HHT). The improved HHT is composed of HHT with Wavelet Packet Transform (WPT) and a simple but effective method for intrinsic mode function (IMF) selection. For different damage status, in order to obtain structural dynamic responses, which imply plentiful damage information, the composite wing boxes were excited by a contrived square wave signal. Then, the dynamic responses of intact wingbox and damaged wingbox are disposed using improved HHT. Finally, a feature index vector of structural damage, i.e. the ariation quantity of instantaneous energy, is constructed. The obtained results show that the proposed damage feature index vector is more sensitive to small damage than those in traditional signal processing.

Info:

Periodical:

Key Engineering Materials (Volumes 324-325)

Edited by:

M.H. Aliabadi, Qingfen Li, Li Li and F.-G. Buchholz

Pages:

539-542

DOI:

10.4028/www.scientific.net/KEM.324-325.539

Citation:

H. G. Chen et al., "Vibration-Based Damage Detection of Composite Wingbox Structures Using Improved Hilbert-Huang Transform ", Key Engineering Materials, Vols. 324-325, pp. 539-542, 2006

Online since:

November 2006

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Price:

$35.00

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