Low velocity impact energy monitoring for varing crosssection composite laminates

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (10) : 247-254.

LU Guan1，LIANG Dakai2，XU Yiming3，QIU Zixue1

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Abstract

For monitoring the inner injuries by the low velocity impact(LVI) on varing crosssection composite laminates, a Fiber Bragg Grating(FBG) impact energy monitoring system based on the optical fiber sensing and signal processing technique was established. The spectrum signatures of all impact sample signals from the FBG sensing network were extracted by using the Whitening Empirical Mode Decomposition(WEMD) method. Then, the energy feature sets were set up based on the impact energy characteristic values of all sample signals. Finally, the thickness coefficients were determined according to the first order component of the sample signals decomposition,the energy feature sets were adjusted correspondingly, and the actual impact energy was estimated. The experimental results prove that the thickness coefficient correction method based on WEMD can evaluate LVI energy more accurately, the mean error in low sensitivity large thickness areas was reduced to 6.96% from 15.19%. The proposed energy discrimination method can discriminate the energy between 1-3 J,with the maximum error 15.67% and mean error 5.5%.

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optic-fiber Bragg grating / composite laminates with varied thickness / low velocity impact / impact energy monitoring

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LU Guan1，LIANG Dakai2，XU Yiming3，QIU Zixue1. Low velocity impact energy monitoring for varing crosssection composite laminates[J]. Journal of Vibration and Shock, 2018, 37(10): 247-254

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