基于FBG动态应变监测的金属结构损伤识别方法研究  

Study on Metal Structure Damage Identification Based on Dynamic Strain Monitoring Using Fiber Bragg Grating Sensor

作　　者：黄博[1] 白生宝[1] 宁宁[1] 杨宇[1] 肖迎春[1] 

机构地区：[1]中国飞机强度研究所全尺寸飞机结构静力/疲劳航空科技重点试验室,西安710065

出　　处：《航空制造技术》2017年第19期67-71,共5页Aeronautical Manufacturing Technology

摘　　要：结构关键部位早期损伤的识别对结构的安全性具有重要意义,损伤的早期发现可为结构的使用和维修提供及时的参考和支持。利用光纤光栅传感器对结构的动态应变进行测试,应用应变模态识别技术对结构局部的动态应变响应特征进行提取,并构建损伤识别指标,对结构的损伤位置和损伤程度进行识别。结果表明:动态应变响应特征对结构局部损伤敏感,同时损伤识别指标能够反映损伤区域以及损伤的程度,可为结构微小损伤的识别与定位提供技术方法。The identification of early partial damage in critical parts is of great significance for the safety of the structure.The early detection of the damage can provide basis and support for the use and maintenance of the structure.The dynamic strain of the structure is tested by fiber Bragg grating sensor.At the same time,the dynamic strain response characteristics of the structure are extracted by using the strain modal identification technique.A damage identification index is proposed based on strain response characteristics to identify the damage degree and location.The experimental results show that the dynamic strain response is sensitive to the local damage,and the damage identification index can reflect the degree and location of damage,which can achieve the purpose of structural early damage identification.

关 键 词：损伤识别 动态应变监测 光纤光栅传感器 

分 类 号：TG115.5[金属学及工艺—物理冶金]