固体声谐振子扰动的理论和实验研究

A Theoretical and Experimental Study on the Perturbation of Solid Acoustic Resonator

为进行快速无损检测（ＮＤＴ），研究了固体声谐振子扰动和声学特征变化的关系．用有限元方法分析了存在和无缺陷样品的振动频率和振型，用数字信号处理技术，实验研究了样品中缺陷对声学特征的影响．实验和理论结果一致性很好，为用声学特征进行无损检测提供了理论和实验指导．

Using acoustic signature for nondestructive testing (NDT), relation between peturbation and acoustic signature of resonator is studed. The resonance frequencies and the field shapes of samples with or without crack are calculated by finite element method(FEM). Corresponding experiments are carried out for comparison and the results are conformed well. All of this are guide for NDT with acoustic signature inspection.