水介质非线性声学效应影响因素研究

项目名称： 水介质非线性声学效应影响因素研究

项目编号： No.11204050

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 时洁

作者单位： 哈尔滨工程大学

项目金额： 30万元

中文摘要： 水声学的发展对于国家国民生产及军事国防建设具有重要的意义，研究水下声场中的非线性问题得到越来越多的重视和关注，诸多重大研究成果均围绕一个核心问题，那就是对介质中非线性声学效应的有效利用，但目前对于影响水介质非线性声学效应强弱的敏感因素仍没有统一性的研究结果。本项目以在水声领域中更为充分而有效利用非线性声学效应为出发点，研究影响水介质非线性声学效应强弱的敏感因素，获得增强非线性效应的手段和方法，掌握有限振幅声波传播及多种互作用条件下的声波频率及能量转换规律，通过实验室实验研究，将实验测量结果与理论分析结果进行比对，明确非线性效应强弱与声波频率及能量转换效果之间的关系，并对不同声波及介质参数下的转换效果进行评价。

中文关键词： 非线性声学效应；敏感因素；非线性相互作用；；

英文摘要： The development of underwater acoustics is of great significance for the national production and national defense construction. So the research on the nonlinear problems in the underwater acoustic field is getting more and more attention. And almost all the important research results in the field of nonlinear acoustics focus on a core issue, that is, the effective utilise of nonlinear effects in the complex medium. However, there are still no coherent research results about the sensitive factors which influence the nonlinear effects strength. Taking full advantage of nonlinear effects in the field of underwater acoustics, this project studies the sensitive factors which influence the nonlinear effects strength, and obtains the methods to enhance the nonlinear effects, then clearly identifies and masters the acoustic frequency and energy conversion law under the conditions of the finite amplitude acoustic propagations and various interactions between them. Finally, through the laboratory experiments researches, the experimental results are compared with the theoretical analysis carefully. Then the relationship between the nonlinear effects strength and the acoustic frequency and energy conversion effects is further identified clearly. As the same time, the acoustic energy conversion effects are evaluated under di

英文关键词： Nonlinear acoustic effects；sensitive factors；nonlinear interaction；；