Low velocity impact energy monitoring for varing crosssection composite laminates
LU Guan1,LIANG Dakai2,XU Yiming3,QIU Zixue1
1.School of Mechanical Engineering,Nantong University,Nantong 226019,China;
2.State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;
3.School of Electrical Engineering,Nantong University,Nantong 226019,China
Abstract:For monitoring the inner injuries by the low velocity impact(LVI) on varing crosssection 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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