梁式结构损伤识别的敲击扫描方法研究

项目名称： 梁式结构损伤识别的敲击扫描方法研究

项目编号： No.10802040

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 向志海

作者单位： 清华大学

项目金额： 22万元

中文摘要： 结构损伤识别是学术和工程界普遍关心的重要问题。本项目受到啄木鸟通过敲击树干来找虫子等自然现象的启发，构想出一种用于结构损伤识别的敲击扫描方法。经过三年的努力，课题组超额完成了预定的研究任务，并主要取得了以下成果：(1)揭示了敲击式损伤识别方法的力学机理，得到了损伤灵敏度的解析解；(2)系统地发展了敲击扫描式损伤识别方法，并进行了数值模拟和实验验证；(3)详细研究了敲击扫描式损伤识别方法的抗干扰能力。根据这些成果，项目组发表了6篇期刊杂志文章（其中有2篇已接收，即将刊登）；获得1项中国发明专利授权，正在申请2项中国发明专利和1项美国专利。本项目研究还在国际国内学术会议上和同行进行了广泛的交流，引起了大家的关注，并进一步得到了工业界的资助以研制具体的产品。虽然本项目的研究初衷只是为了解决梁式结构的损伤识别问题，但是我们发现该方法也适用于平板等其它结构的损伤识别。该方法不但具有重要的理论意义，而且可以预见其非常广泛的应用前景。

中文关键词： 反问题；损伤识别；敲击扫描方法

英文摘要： Structural damage detection is an important problem that obtains much attention in communities of academe and engineering.Inspired by the observation that woodpeckers hunt for worms through tapping on the trunk, a tap scan method is proposed in this project to detect the damage in structures. After three years' effort, preconcerted tasked have been overfulfilled and the following major results have been achieved: (1) unveil the mechanism of tap method for structural damage detection, and obtain the analytical solution of damage sensitivities; (2) systematically develop the tap-scan damage detection method, which has been verified numerically and experimentally; (3) the anti-noise ability of the tap-scan damage detection method has been thoroughly studied. Based on these results, 6 journal papers have been published (2 in press); 1 Chinese invention patent has been authorized and other 2 Chinese invention patents and 1 US invention patent have been submitted. During the conference discussion, this research has drawn intensive attention, which results in further support from inductry to develop real devices. Although, the initial object of this project aims at beam structures only, the developed method can also be implemented to other structures, such as plates. This method not only has theoretical significance, but also expects broad applications in future.

英文关键词： Inverse problem; damage detection; tap-scan method