复杂声场环境下任意外形声源的瞬态近场声全息方法研究

项目名称： 复杂声场环境下任意外形声源的瞬态近场声全息方法研究

项目编号： No.11274087

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 毕传兴

作者单位： 合肥工业大学

项目金额： 89万元

中文摘要： 现有的近场声全息主要是针对稳态声场条件，而在实际工程中，大多数噪声与振动问题是由瞬态激励所引起，因此开展瞬态近场声全息研究具有重要的实际意义。目前，有关瞬态近场声全息的研究主要是借助稳态近场声全息理论实现，已有的方法或是对全息面和重建面形状有限制，或是计算速度和精度较低，且均局限于自由声场条件。鉴此，本项目拟首先建立一种具有较高的计算速度和精度且适用于任意外形声源的基于时域等效源法的瞬态近场声全息方法；随后针对非自由声场、运动声源等复杂声场环境提出瞬态声场分离方法以及运动声源瞬态近场声全息方法，并对各参数敏感性及选取方法、误差敏感性及抑制方法展开研究，形成完善的复杂声场环境下任意外形声源的瞬态近场声全息理论。基于以上理论，研制相应的测量分析系统，开展实验研究。该项目研究成果有望解决现有瞬态近场声全息方法所存在的问题，对进一步推进瞬态近场声全息理论的发展及其在实际工程中的应用具有重要的意义。

中文关键词： 瞬态近场声全息；声场分离；时域等效源法；非自由声场；运动声源

英文摘要： Nearfield acoustical holography (NAH) is usually restricted to stationary conditions. However, in practice, most noise and vibration problems are produced by transient excitations. And therefore, it is very important to study NAH for transient conditions. Unfortunately, this study is still in its infancy, and the lack of a simple and effective method is still the main problem. Although some transient NAH methods have been provided, most of them are still based on the theory of stationary NAH, and either the shapes of the hologram surface and the source surface are required to be regular or the calculation precision and efficiency are low. Moreover, the free-field condition is also required. In order to solve these problems, this project will provide a transient NAH based on the time-domain equivalent source method, which can be used for arbitrarily shaped sources and has good calculation precision and efficiency. And then, the transient NAH is to be extended to complex acoustic environments such as non-free sound field and the sound field of moving sound sources. The sensitivities of measurement parameters and measurement errors will be analyzed, and the optimal parameter selection methods and the error control methods will be provided. Based on these theoretical studies, a measuring and analyzing system will be

英文关键词： Transient nearfield acoustical holography；sound field separation；time-domain equivalent source method；non-free sound field；moving source