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。
The secular equations for symmetric and skew symmetric wave mode propagation were derived.
导出了对称和斜对称模式下波传播的特征方程。
A theoretical model for nonlinear Lamb mode propagation in a composited layer has been established, based on a partial plane wave approach.
基于导波的部分平面波分析理论，建立了复合固体层中非线性兰姆波的理论模型。
应用推荐