多轴载荷环境下海洋平台结构件疲劳裂纹在线监测方法和演化规律研究

项目名称： 多轴载荷环境下海洋平台结构件疲劳裂纹在线监测方法和演化规律研究

项目编号： No.61501418

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 穆为磊

作者单位： 中国海洋大学

项目金额： 19万元

中文摘要： 由于海洋平台在海洋环境中面临着复杂多变的恶劣环境，在交变应力载荷的作用下结构件会产生疲劳损伤，严重时会产生灾难性后果。在这样的背景下，针对声发射在线监测技术中试验样件与实际结构件裂纹扩展规律难以确定相关关系的问题，项目提出基于海洋风浪流统计概率分布模型的多轴载荷试验方案，探索多轴载荷作用下疲劳裂纹的扩展规律；在声发射信号处理方面，项目提出基于多重分形理论、随机共振理论和复杂网络理论构建新颖的声发射信号处理方法，实现裂纹信号的准确提取、裂纹信号降噪处理和裂纹状态识别，最终提出疲劳裂纹在线监测和识别方法，从而为海洋平台结构件的维护维修提供状态数据和裂纹演化模型。

中文关键词： 声发射；无损检测；应力波

英文摘要： The offshore platform is always facing the complex and uncertain environment. Under this marine environment, the structure parts will generate fatigue crack. Seriously, it is likely to leads to the failure of the structure parts. With this background, according to the problem that it is hard to determine the relationship between the evolution rule of test samples and that of actual structure, this project proposes a multi axial loading expriment based on the statistical probability distribution model of ocean winds-waves-flows. It is likely to explore the evolution rule of the structure fatigue crack. In the acoustic emission signal processing, this project construct a noval method based on the multi fractal theory, the stochastic resonance theory and the complex network theory. It is likely to realize the accurate extraction of crack signal, the noise reduction of crack signal and the recognition of crack state. On the basis of the conceive, we propose the fatigue crack online monitoring and recognition method. It is possible to provide the state data and the evolution rule model for platform maintenance.

英文关键词： acoustic emission;nondestructive testing;stress wave