Low-speed Impact Localization on a Stiffened Composite Structure Using Reference Data Method

• Journal title : Composites Research
• Volume 29, Issue 1,  2016, pp.1-6
• Publisher : The Korean Society for Composite Materials
• DOI : 10.7234/composres.2016.29.1.001
Title & Authors
Low-speed Impact Localization on a Stiffened Composite Structure Using Reference Data Method
Kim, Yoon-Young; Kim, Jin-Hyuk; Park, Yurim; Shrestha, Pratik; Kwon, Hee-Jung; Kim, Chun-Gon;

Abstract
Low-speed impact was localized on a stiffened composite structure, using 4 FBG sensors with 100 kHz-sampling rate interrogator and devised localization algorithm. The composite specimen consists of a main spar and several stringers, and the overall size of the specimens surface is about $\small{0.8{\times}1.2m}$. Pre-stored reference data for 247 grid locations and 36 stiffener locations are gathered and used as comparison target for a random impact signal. The proposed algorithm uses the normalized cross-correlation method to compare the similarities of the two signals; the correlation results for each sensors signal are multiplied by others, enabling mutual compensation. 20 verification points were successfully localized with a maximum error of 43.4 mm and an average error of 17.0 mm. For the same experimental setup, the performance of the proposed method is evaluated by reducing the number of sensors. It is revealed that the mutual compensation between the sensors is most effective in the case of a two sensor combination. For the sensor combination of FBG #1 and #2, the maximum localization error was 42.5 mm, with average error of 17.4 mm.
Keywords
Impact localization;Stiffened composite structure;Fiber Bragg grating sensor;Normalized cross-correlation;
Language
Korean
Cited by
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