The result shows that the delay effect of noise propagation and the effect of the compressibility of liquid on the noise can be obtained.

结果显示混合边界元方法在这类动边界声辐射问题上，能体现出声音传播的延迟效应，体现出液体压缩性对声压峰值的影响。

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For a description of the mixing behaviour the compressibility factors of the pure substances and of the mixtures were used to calculate the mixing effect of the pressure and the excess volume.

为了描述真实气体的混合性质，根据纯物质和混合物的压缩因子计算了压力混合效应和过剩体积。

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An exponential model is proposed to fit the stress-strain-time curve and obtaining good fitting effect. Parameters of this model are easy to get and can reflect the compressibility and its mechanism.

采用指数模型拟合城市固体垃圾的应力-应变等时曲线，并取得了很好的拟合效果，模型参数简单易求，可反映城市固体垃圾压缩性的大小及其压缩机制。

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