【摘要】 适合薄板检测的超声兰姆波多模式具有频散特性,它携带着有用的时延信息,但估计其中的时延参数有一定的困难。本文提出的基于自适应线调频频散变换的超声兰姆波多模式时延估计方法使提取其时延参数成为可能。仿真和实验结果说明了这种方法的有效性。更多还原

【Abstract】 Multi-mode ultrasonic Lamb waves, which are suitable for non-destructive testing of the thin plates, have dispersion characters and accompany with a lot of useful information of the time delay. But there are many difficulties to estimate the time delay parameter. Based on the adaptive chirplet dispersion transform , we put forward a new method of the time delay estimation to make the parameter estimation possible. The results of the simulations and experiments show its effectiveness.更多还原