Ultrasonic detection method of desizing state inside corrugated pipe

In order to detect the defects of desizing states inside corrugated pipes, an ultrasonic detection method based on variational mode decomposition (VMD) and ant colony neural network is proposed. The detected echo signal is decomposed by VMD method, and the multi-scale entropy of the decomposed signal is taken as the characteristic parameter and input into the ant colony neural network for detection. The experimental results show that the combination of VMD method and ant colony neural network can effectively judge the transverse defects in corrugated pipes.