Based on the analysis of sound incidence and fluid-structure Coupled condition, a mathematic model of double-proof window is established, and this model involves the design parameters.

通过对声波入射的分析，同时结合流固耦合条件，建立出双层隔声窗传声损失的数学模型，该模型能够同时包括隔声窗的优化设计参数。

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Coupled with this is the notion that happiness is a permanent condition. If we're not joyful all the time, we conclude there's a problem.

另外还有一个概念就是幸福是一种永恒的状态。如果我们不是一直快乐，我们就是不快乐。

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This method can be applied to the coupled vibration problem with complex boundary condition.

本方法可以适用于这类边界条件复杂的耦合振动问题。

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