封闭空间中声源辐射阻抗特性研究

项目名称： 封闭空间中声源辐射阻抗特性研究

项目编号： No.11504065

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 唐锐

作者单位： 哈尔滨工程大学

项目金额： 20万元

中文摘要： 为了拓展非消声水池低频应用范围，本课题将从封闭空间声场边界对声源辐射阻抗的影响机理角度开展理论及试验研究。目前，如何在现有条件下的非消声水池中对大型复杂结构声源进行低频声学特性测量已成为迫切解决的问题，这已超出了混响法的适用条件。针对这一问题，以封闭空间中小尺度典型声源和大尺度弹性壳体结构的辐射阻抗为研究对象，建立封闭空间中声源辐射阻抗的理论分析模型，通过研究不同声场边界对声源辐射阻抗的影响机理，在低频域建立封闭空间中声源辐射阻抗及辐射声功率的自由场校正方法；通过原理验证试验，深入分析非消声水池声场与自由场间的内在联系，验证所建立的在非消声水池中测量声源低频辐射声功率方法的可行性，并分析该测量方法的适用条件，为掌握水下结构声源低频声学特性提供一种新的测量技术手段。

中文关键词： 封闭空间；非消声水池；辐射阻抗；低频；校准

英文摘要： In order to expand the low-frequency applications in a non-anechoic pool, the theoretical and the experimental research, on which the mechanisms of the sound radiation impedance changes are impacted by the boundary of an enclosed chamber, will be carried out in this subject. Currently, how to measure the low-frequency acoustic properties of the large complex structures in a non-anechoic pool becomes an urgent problem to be solved, which is exceeded the application of the method of reverberation. To solve this problem, in an enclosed chamber, the each radiation impedance of the small-scale typical sound source and the large-scale elastic shell structures are selected as investigated subjects. The mechanisms of the radiation impedance changes which are impacted by the boundary will be studied by establishing the theoretical analysis model of the radiation impedances, in further, the free-field correction method of measuring the radiation impedance and sound radiation power in an enclosed chamber are established in the low-frequency ranges. The principle experiments will be done to verify the feasibility of the proposed measuring method, with analyzing the internal relationship between the non-anechoic pool field and the free field, the application limitations will also be given by analyzing the experiment results. All these work can provide a new technique for mastering the low-frequency acoustic properties of the complex underwater structures.

英文关键词： enclosed chamber;non-anechoic pool;radiation impedance;low-frequency;calibration