国产欧美精品一区二区,中文字幕专区在线亚洲,国产精品美女网站在线观看,艾秋果冻传媒2021精品,在线免费一区二区,久久久久久青草大香综合精品,日韩美aaa特级毛片,欧美成人精品午夜免费影视

Aiming at the problem that ultrasonic detection may be missed on the edges and wheelsets of steel plates, phased array ultrasonic detection technology is used to image and detect crack defects and wheel-to-wheel hole defects of steel plates, and for the problem of low signal-to-noise ratio of steel plate and wheel pair defect scattering signals, a parameter-optimized variational modal decomposition (VMD) algorithm is proposed, which avoids human subjective influence and characterizes the original signal characteristics by selecting the eigenmodal function (IMF) component of the corresponding frequency band. The effect of the (VMD) algorithm is evaluated by comparing the signal-to-noise ratio and root mean square error of each eigenmodal function (IMF) component of the VMD decomposition with the signal-to-noise ratio of the original signal, and finally the defect imaging detection is realized. The experimental results show that compared with the original signal, the defective signal processed by the method has good fidelity, signal-to-noise ratio and smoothness, the rms error is reduced, and the modal aliasing phenomenon is not easy to occur, and there is a good decomposition effect. After processing, the imaging results are clearer, and the size, position and shape of the defects can be fully displayed, which can realize the positioning and detection of hole defects and crack defects.