电磁式甚低频水下声源理论研究

项目名称： 电磁式甚低频水下声源理论研究

项目编号： No.10804023

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 电工技术

项目作者： 蓝宇

作者单位： 哈尔滨工程大学

项目金额： 17万元

中文摘要： 甚低频声源对于研究海洋环境测量、水声技术、海洋资源开发、地声探测等领域具有重要的意义。本项目在基金的支持下，对电磁式水下声源理论进行了研究。研究从甚低频声辐射理论入手，通过对甚低频辐射模型的分析编写了甚低频辐射特性分析软件；由于电磁式甚低频声源具有多场耦合的特点，在研究中利用电磁等效原理、机电转换原理、机械振动原理构建了电磁式甚低频声源多物理场耦合分析模型，在此基础上运用Simulink软件与电磁有限元分析软件Ansoft分析了声源的动态特性，得到了声源激励电流、振动位移、电磁力等性能参数之间的动态关系，为声源性能的优化提供了理论依据。最后根据动态分析和优化的结果，设计制作了30Hz电磁式甚低频声源试验样机。经测试，试验样机水中谐振频率29Hz，最大声源级可以达到182.6dB，达到了设计要求，验证了理论分析结果。项目按照研究计划完成。

中文关键词： 甚低频；多物理场耦合；动态特性；有限元

英文摘要： Very low frequency underwater sound source has great significances in measure of ocean entironment, technical underwater acoustics, marine resource exploitation, geoacoustics exploration and so on.The analyse theory of electromagnetic very low frequency sound source was researched by the fund. The very low frequency sound source radiation theory was researched at beginning. Then the software of very low frequency radiation characteristic was programed by analyzing the very low frequency radiation mode. Becouse of the multi-physics coupling characteristic in sound source, the multi-physics coupling mode of vert low frequency sound source was produced by electromagnetic equivalence principle, electromechanical conversion principles and mechanical vibration principle. The dynamic characteristic theory of electromagnetic sound source was analyzed by Simulink and electromagnetic finite element software Ansoft.The relationship between excitation current, vibration displacement and electromagnetic force were obtained. The theoretical basis were supported for optimization of sound source performance.Finally, according to the results of dynamic analysis and optimization, 30Hz electromagnetic very low frequency sound source was designed. After testing, the water resonance frequency of sound source was 29Hz and the maximum source level was 182.6dB. The design requirements were achieved and the results of theoretical analysis were erified. The project was finished according to plan.

英文关键词： very low frequency; muti-physics coupling; dynamic characteristic; finite element