Acoustics and dynamic materials
Acoustics and dynamic materials
复制标题
声学和动态材料
DOI：
10.1016/j.mechrescom.2020.103502
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发表时间：
2020
影响因子：
2.4
通讯作者：
P. Martin
中科院分区：
文献类型：
--
作者：
P. Martin
结合可允许的背景流或介质、平衡定律、状态方程和微扰理论，导出了小振幅声扰动的控制方程。当背景介质在空间和时间上都可以变化时，这里使用这种标准方法，从而定义动态材料。当背景速度为零时，背景密度不随时间变化，假设遵守通常的平衡定律（如质量守恒）。当质量守恒被丢弃时，也许用增长模型代替，允许随时间变化的背景密度，从而导致在某些动态材料中控制声学扰动的新方程。
The governing equations for small-amplitude acoustic disturbances are derived by combining an admissible background flow or medium, balance laws, an equation of state and perturbation theory. This standard approach is used here when the background medium can vary in both space and time, thus defining a dynamic material. When the background velocity is zero, the background density cannot vary with time, assuming that the usual balance laws (such as conservation of mass) are obeyed. When mass conservation is discarded, perhaps replaced by a growth model, a time-dependent background density is permitted, leading to new equations governing acoustic disturbances in certain dynamic materials.