通过阻尼层与壳体作用的边界条件求解流固耦合振动方程，解得辐射声场的表达式。

Through the border conditions of damping layer combined with the shell the coupled oscillation equation was solve, and radiation sound field expression was shown using the shell displacements.

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基于转子动力学和齿轮啮合基本原理，建立了一般齿轮耦合轴系弯扭耦合振动方程。

Based on rotor dynamics and the basic principle of gear mesh, this paper sets up the lateral-torsional coupling vibration theory of a general geared rotor-bearing system.

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利用三角级数法模拟了轨道的不平顺，采用列车编组和桥梁组合的模型，建立了车桥耦合振动方程。

By simulating the track irregularities with trigonometric series method, the train-bridge coupling vibration equations are established based on the combined modal of train formation and the bridge.

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