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。
Normal mode of coupled harmonic oscillator is obtained by means of algebra, the procedure is simple and the physical meaning is clear.
本文用代数的方法求出了耦合谐振子的简正模，过程简单且物理意义清晰。
The bifurcation behavior of the coupled nonlinear normal mode is associated with detuning parameter and mode amplitude, but not with the nonlinear stiffness of uncoupling spring.
耦合非线性模态的分叉既与调谐参数有关又与模态振幅有关，但与非耦合弹簧的非线性刚度无关。
The bifurcation behavior of the coupled nonlinear normal mode is associated with detuning parameter and mode amplitude, but not with the nonlinear stiffness of uncoupling spring.
耦合非线性模态的分叉既与调谐参数有关又与模态振幅有关，但与非耦合弹簧的非线性刚度无关。
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