| 申肖雪,卢浩,肖友刚.流域网格中嵌入式复杂声源的时域传播仿真[J].声学技术,2017,36(5):405~409 |
| 流域网格中嵌入式复杂声源的时域传播仿真 |
| Time domain propagation characteristics of complex embedded acoustic sources in fluid meshes |
| 投稿时间：2017-01-18 修订日期：2017-02-28 |
| DOI：10.16300/j.cnki.1000-3630.2017.05.002 |
| 中文关键词: 复杂声源 时域 有限体积法 声辐射 |
| 英文关键词: complex acoustic source time domain Finite Volume Method(FVM) sound radiation |
| 基金项目:国家自然科学基金资助项目（50975289、51275531） |
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| 摘要点击次数: 1411 |
| 全文下载次数: 1453 |
| 中文摘要: |
| 针对声学商业软件较难模拟任意形状、时变复杂声源的声辐射问题，使用有限体积法在时域内求解无声源项亥姆霍兹（Helmholtz）方程，将复杂声源嵌入到有限体积单元节点，推导了由给定声源表面声压或振动位移得到速度势公式，提高了声源处理的灵活性和计算效率。该方法允许对初始场问题及复杂时变声源声辐射进行仿真。对常见声源及二阶圆柱体声源声辐射进行了数值模拟，结果与解析解及商业软件结果进行了对比，误差均小于15%。程序具有良好的封装性及通用性，可以灵活地对不同声源进行组合，得出任意复杂声源时域的传播规律，为复杂声源声辐射等线性声学问题的研究提供了一个可靠的平台。 |
| 英文摘要: |
| Commercial acoustic software is generally hard to simulate sound radiation of complex acoustic sources, which are of arbitrary shape or time-varying. In order to solve this problem, the Helmholtz equation (without acoustic source term) is solved in time domain via Finite Volume Method with embedding acoustic sources to Finite-volume nodes, and the relationship between velocity potential and the pressure/displacement of acoustic source is acquired. This method makes it more convenient and efficient to deal with the acoustic source in numerical calculation. In addition, it allows simulating initial value problem and time-varying source problem. The sound radiation of common acoustic sources and the second order cylindrical acoustic source has been simulated, and the results agree well with analytic solutions and results of commercial code, with numerical errors smaller than 15%. This code has good encapsulation and versatility, via which different types of acoustic sources can be combined to form an arbitrary complex acoustic source and the propagation characteristics can be obtained. It is a good platform of carrying out research on linear acoustics like sound radiation of complex acoustic sources. |
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