Abstract:

The large numbers of nondestructive test signals of wood-base panel are complicated non-stationary time_varying signals. It is difficult for Fourier analysis to processing that. Wavelet analysis is the development of methods on signal processing and is an effective method for processign an unsteady signal. Taking the medium density fiberboard as the sample,discussed the feasibility of the applications of wavelet analysis in the nondestructive test wood-base panel. The main results were as follows: the longitudinal resonance modulus of elasticity that was measured by wavelet analysis can be the token of conventionality static modulus of elasticity because that had prominent correlation with static modulus of elasticity under the level of 0.01. The defects of samples can be judged by wavelet analysis that has superiority in the defect nondestructive test.

Key words: nondestructive test, wavelet analysis, medium density fiberboard, modulus of elasticity