基于主动声发射的覆冰绞线结构损伤协同反演成像机理及识别方法研究

项目名称： 基于主动声发射的覆冰绞线结构损伤协同反演成像机理及识别方法研究

项目编号： No.51305141

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 洪晓斌

作者单位： 华南理工大学

项目金额： 25万元

中文摘要： 面对覆冰环境下绞线结构损伤监测新型测量问题，现有检测方法受到了极大挑战。项目提出集成多PZT主动声发射损伤监测新方式，原创性探索基于协同论的覆冰绞线结构损伤协同反演成像及识别关键科学问题。通过寻找覆冰绞线结构损伤识别中无序到有序的主动声发射演化途径，建立协同反演监测机理模型，研究模型各边界参数与损伤聚焦特性关系，指导获得多传感协同反演损伤聚焦最高增益；从时域协同聚焦角度研究多维损伤位置成像，克服传统方法容易只发现散射信号较大的目标而忽略小目标问题，结合实验在空间能量分布模式下探索不同损伤类型特征向量形成规律，建立不同损伤类型特征库；进一步基于协同论自组织效应，在非平衡协同系数下对不同损伤类型识别的协同认知网络参数整体优化，使能适应复杂外界环境下损伤信息变形动态识别，最后在覆冰环境平台进行识别系列实验。项目研究对复杂机械结构健康监测技术应用及发展具有重要学术价值和实际意义。

中文关键词： 协同学；主动声发射；时间反演；PZT；覆冰绞线结构

英文摘要： Facing damage detections of stand wire structures in the wide range icing environment , which has been an enormous challenge for existing monitoring methods, the new active acoustic emission damage monitoring mode integrating many PZTs in the project is put forward. What is more, the key scientific problems for synergetic inversion imaging and its identification of damage of icing stand wire structures based on Synergetics are explored originally. The active acoustic emission evolutionary path from disorder to order for icing stand wire structural damage identification is studied to establish cooperative inversion monitoring mechanism model. Then the relationships between the boundary parameters of the model and its damage focusing characteristics are studied, which can guide to achieve highest focus gain for damages with cooperative inversion stress wave. From the time-domain perspective，equivalent energy imaging recognition of multidimensional damage location is presented ，which aims to overcome the traditional method's shortcoming that can detect only biggest scattering goal ,but ignore the smaller target. Moreover, based on the space energy distribution with experiments in the icing experimental platform which has been established by authors, original feature vector formation law of different damage t

英文关键词： Synergetics；Active acoustic emission；Time reversal；PZT；Icing strand wire structure