Wavelet analysis for the propagation of stress waves in piles
Xing Xin-kui · World Earthquake Engineering · 2006
Theory analysis and the measured data are shown that excitation pulse in pile integrity testing is silimar to half-period of the sine curve,and different exciting methods produce signals with different period of time,so its frequency composition is also different.It is known that influences of pile damping on the amplitudes absorption and wave dispersion in the pile are different for different frequency compositions.In order to evaluate the pile integrity characteristics correctly the variability of the amplitudes absorption and the wave dispersion should be known for different frequency band.Wavelets analysis is used to decompose the compound signal into time domain and frequency domain.So the test results can be contrasted with the same frequency band.Utilizing the site test data,the absorption coefficient and the wave dispersion of the piles for the different frequency band are researched.