Abstract
In practical application, carbon fiber reinforced plastics (CFRP) structures are easy to appear all sorts of invisible damages. So the damages should be timely located and detected for the safety of CFPR structures. In this paper, an acoustic emission (AE) localization system based on fiber Bragg grating (FBG) sensing network and support vector regression (SVR) is proposed for damage localization. AE signals, which are caused by damage, are acquired by high speed FBG interrogation. According to the Shannon wavelet transform, time differences between AE signals are extracted for localization algorithm based on SVR. According to the SVR model, the coordinate of AE source can be accurately predicted without wave velocity. The FBG system and localization algorithm are verified on a 500 mm×500 mm×2 mm CFRP plate. The experimental results show that the average error of localization system is 2.8 mm and the training time is 0.07 s.
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Acknowledgments
This research is supported by the National Natural Science Foundation of China (Grant Nos. 61503218 and 41472260), the Fundamental research funds of Shandong University, China under Grant Nos. 2014YQ009, 2016JC012, and the Young Scholars Program of Shandong University 2016WLJH30.
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Sai, Y., Zhao, X., Hou, D. et al. Acoustic emission localization based on FBG sensing network and SVR algorithm. Photonic Sens 7, 48–54 (2017). https://doi.org/10.1007/s13320-016-0377-x
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DOI: https://doi.org/10.1007/s13320-016-0377-x