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

Abstract

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.

Hybrid Signal Processing Technique to Improve the Defect Estimation in Ultrasonic Non-Destructive Testing of Composite Structures

“…However, there are some serious limitations associated with EMD, such as mode mixing, which is due to the oscillations of various amplitudes in an IMF or similar type of oscillations present in the different IMFs. The other limitation in EMD is called end effect, which arises during the spline fitting process to generate the envelope of the signal [ 54 ]. During this process, the big swing of the signal envelope could interfere and disturb the signal itself.…”

Application of Hilbert‐Huang Transform in Structural Health Monitoring: A State‐of‐the‐Art Review

“…Chen et al [65,66] developed a vibration-based approach to detect the damage of composite wingbox structures using improved HHT. The improved HHT approach is composed of HHT with wavelet packet transform and a simple but effective method for IMFs selection.…”

برآورد میزان آسیب در اتصالات صلب قاب‌های خمشی فولادی با استفاده از روش تجزیه‌ی متعامد سره و الگوریتم بهینه‌یابی ازدحام ذرات

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