中文摘要：

为在盘子中的接触缺点的察觉的一种非线性的声学的技术被开发把指导波浪与低频率颤动改变的vibro调整 techniques.The 联系在接触缺点以内的接口区域；然后，指导波浪从接触反映了的高频率的振幅和阶段背叛将是到退出接触缺点的 modulated.Due ，在调制指导波浪 series.Furthermore 的时间频率分发有明显的低频率部件非线性

英文摘要：

A nonlinear acoustic technique for detection of contact defects in plates was devel- oped associating guided waves with vibro-modulation techniques. The low frequency vibration varies the interface area within the contact defect; then the amplitude and phase of high fre- quency guided waves reflected from the contact defect will be modulated. Due to the exiting of contact defects, there was obvious low frequency component in the time-frequency distribution of modulated guided wave series. Furthermore the nonlinear responses at frequency of vibra- tion were extracted out and used for defect imaging. It was shown that the nonlinear guided wave imaging method based on vibration modulation can effectively characterize and locate the nonlinear contact defects.