一维声传播方程约束条件下双平面近场声全息测量方法研究

项目名称： 一维声传播方程约束条件下双平面近场声全息测量方法研究

项目编号： No.11474074

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 商德江

作者单位： 哈尔滨工程大学

项目金额： 90万元

中文摘要： 水下近场声全息测试技术是水下航行器表面源强度识别的主要方法，实际试验测量中主要采用双平面作为全息测量面。本项目针对双平面近场声全息原理中存在的有限测量面带来的声场截断误差和声源表面强奇异积分处理问题，提出了利用一维声传播方程作为约束条件的处理办法。这样既可以提高强奇异积分处理精度，保证声源表面声场重建的可靠性；同时，由于只增加了有限个一维声传播测点，可以使声场截断误差明显提高，而所付出的代价却很小。本项目首先将对该方法有效性、关键参数对声场反演误差影响以及结构表面声源强度识别能力进行理论数值仿真研究。同时，在消声水池及湖上开阔水域，对一单点和多点力激励下的圆柱壳结构声源进行边界元双平面近场声全息测量试验，进一步验证本项目提出方法的有效性，并根据试验结果分析方法的适用条件，为提高水下航行器结构表面声源识别能力提供一新的技术手段，有较好的应用前景。

中文关键词： 声传播；近场声全息；边界元；非共形

英文摘要： Near-field acoustic holography (NAH) is one of the primary methods to identify the surface source strength for the underwater vehicles, and the double-plane is often adopted as the holograms in practical experiments. In this project, the method that one degree sound propagation equation is combined with the original NAH equations as constrained condition is presented to deal with the problem of the sound field truncation error due to the limited dimension of the double-plane holograms and that of the strong surface singular integral. This method can not only increase the numerical calculation precision of the surface singular integral, and guarantee the successful sound field reconstruction on the source surface, but also greatly decrease the sound field truncation error with little expense. The numerical experiments are presented to research this method's validation 、the key parameters' effect to the sound field reconstruction error and its ability for the surface source strength identification. The double-plane NAH experiments will be done in an anechoic pool and in the lake for a cylindrical shell excited by one and multi point forces to experimentally value this NAH method presented in this project and the its application limitation will also be analyzed according to the experiment results. This project's results hopefully can present a new technique for the surface source strength identification about the underwater vehicles and an extensive application in the future.

英文关键词： sound propagation;NAH;BEM;nonconformal