Thus it offers theoretical and experiment basis for NDT of the defect like foundation void by means of acoustic features.
为用声学特征进行地基脱空等缺陷无损检测提供了理论和实验依据。
2
Based on wave propagation theory, the paper describes briefly basic principle of several acoustic propagation models, and discusses detailedly foundation of coupled normal mode.
在波动传播理论的基础上，简要介绍了几种主要声传播模型的基本原理，并着重对简正波模型进行了研究。
3
This paper introduces the rock acoustic wave test in protective layer of dam foundation in Fenhe Secondary Reservoir and conducts more detailed analysis on the test result.