Modal Analysis of Vibration Signals of Full-size Oriented Strand Board Based on ICEEMDAN-Laplace
In order to non-destructively and rapidly detect the dynamic shear modulus and modulus of elasti-city of full-size oriented strand board,an intrinsic modal identification method under the conditions of the vibra-tion method is proposed,which was achieved by a combination of Improved Complete Ensemble Empirical Mod-al Decomposition of Adaptive Noise(ICEEMDAN)and Laplace wavelet correlation filtering method.First,the foot-size oriented strand board vibration signals were acquired and decomposed by ICEEMDAN to obtain several intrinsic modal functions(IMF)components with different eigen-scales;secondly,the orthogonality index and cor-relation coefficient were used as the criterion index,and the quadratic modal decomposition was integrated to screen out the IMF components containing modal information of the full-size oriented strand board;finally,the in-trinsic frequency of the full-size oriented strand board was extracted by Laplace wavelet correlation filtering,and the detection result was verified by comparing it with the static experiments and simulation analyses.The results showed that the error between the frequency experiment and the simulation results was small,within 0.8％.The correlation coefficients between the dynamic and static results of the elastic modulus in the length and width dir-ections were 0.81282 and 0.74848,respectively,which proved that there was a significant linear relationship between the results.The in-plane shear modulus results from the dynamic and static tests also showed a signific-ant linear relationship,with a correlation of 0.733 85.
full-size oriented strand boardICEEMDAN decompositionLaplace waveletmodulus of elasti-cityshear modulusnondestructive testing
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