The sonic echo method of prototype piles is used to obtain the propagation time of the stress wave in the pile and to evaluate the pile length by using complex continuous wavelet transform (CCWT) method in this paper. The experimental testing results show that the phase-time-frequency diagram obtained by the CCWT analysis can clearly determine the travel time of stress wave in the five different lengths and materials of piles. Then, the pile length can simply be calculated. The errors are less than about 4%. Therefore, this paper suggests the signal obtained from sonic echo method should be applied to the processing of the CCWT analysis. Compared to the traditional time domain analysis, it not only provides the result of high resolution in different frequency bands but also clearly interprets the arrival time point of the reflected signal by the phase angle-time-frequency diagram. This will indirectly reduce the wave arrival time error of human judgment. It obtains the pile length effectively, enhances the accuracy of evaluation, and improves the practicability of the sonic echo method in the field of non-destructive testing.
|Translated title of the contribution||Experimental Study of Complex Continuous Wavelet Transform for Evaluating Pile Length|
|Number of pages||8|
|Journal||Journal of the Chinese Institute of Civil and Hydraulic Engineering|
|Publication status||Published - 2018 Mar 1|
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering