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For ultrasonic echo signals, to analyze the maximum peak ± 1 period error in the cross-correlation measurement of the finite sequence, to propose a method to increase the ratio of the maximum peak and the adjacent peak, and to avoid the periodic deviations in the maximum cross-correlation peaks. This method uses a dual-frequency excitation signal and a selective envelope with a triangular fast decay...
The three-dimensional models of void beneath old cement slab corner with joint are set up using finite element ANSYS software. Through simulating Falling Weight Deflectometer testing, the influence on deflection is analyzed by factors, such as void depth, void area, load transfer capacity, cement slab thickness and temperature, and fitted the relationship between various factors and deflection. It...
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