水下障碍物声波探测与识别的拓扑灵敏度方法研究

项目名称： 水下障碍物声波探测与识别的拓扑灵敏度方法研究

项目编号： No.51209118

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 水利科学与海洋工程学科

项目作者： 袁会娜

作者单位： 清华大学

项目金额： 25万元

中文摘要： 水下障碍物如礁石、桥桩、沉船等的探测与识别在海洋探测、航道治理等领域应用十分广泛。本课题以水下弹性障碍物的声波探测与识别为目的，拟发展基于扩展拓扑灵敏度概念的非迭代弹性障碍物重建方法。首先针对弹性障碍物的声波反散射问题，扩展一阶和高阶拓扑灵敏度的概念并推导相应的公式；然后发展流-固耦合情况下波传播问题的边界积分数值计算方法，实现基于拓扑灵敏度概念的弹性障碍物重建；采用数值试验验证该方法的有效性，并与理论分析相结合探讨该方法的应用范围和对测量误差的敏感性；最后进行室内和现场试验，验证该方法对真实试验数据的有效性。本项目的研究成果可突破现有声波反散射问题求解方法的局限性，在水下探测、地质勘探和医学成像等领域具有广泛的应用前景。

中文关键词： 水下障碍物；声波反散射；拓扑灵敏度；三维重建；试验验证

英文摘要： The inverse problem of detecting and identifying underwater obstacles e.g. reef, pile and wreck is of great importance in many fields such as ocean exploration and channel regulation. This study is concerned with the development of a non-iterative, topological sensitivity-based obstacle reconstruction method for the acoustic detection and identification of underwater elastic obstacles. First, the concepts of topological sensitivity and higher-order topological sensitivity will be extended to deal with the inverse scattering of an elastic inclusion in a background acoustic medium. The corresponding topological sensitivity formulas will be derived through first- and higher-order asymptotic expansions of the cost functional. Second, a boundary integral numerical analysis approach for the fluid-solid interaction problem will be established and the topological sensitivity-based obstacle reconstruction method will be implemented. Third, the effectiveness of this method will be verified through numerical experiments. Combining the experimental results and further theoretical analysis, the possible limitations of this method as well as its sensitivity to measurement error will be discussed. Finally, based on the above developments, laboratory and field tests will be designed and conducted, and the performance of the rec

英文关键词： underwater obstacles；inverse acoustic scattering；topological sensitivity；3D reconstruction；experimental verification