导波结构健康监测中损伤因子的研究和应用  

Research and application of damage indexes in guided wave based structural health monitoring

作　　者：康永乐 邱雷[1] Kang Yongle;Qiu Lei(Research Center of Structural Health Monitoring and Prognosis,State Key Lab of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室结构健康监测与预测研究中心,南京210016

出　　处：《国外电子测量技术》2021年第6期113-119,共7页Foreign Electronic Measurement Technology

基　　金：国家自然科学基金创新群体项目(51921003);江苏省重点研发计划(BE2018123);江苏省六大人才高峰(GDZB-035);教育部霍英东青年教师基金(161048);江苏高校优势学科建设工程项目资助。

摘　　要：基于导波的结构健康监测方法因其对小损伤敏感,既可在线监测也可离线监测等优点是国内外的一个研究热点。在基于导波的结构健康监测中,量化导波信号的变化程度是非常重要的一个步骤,量化值(一般称之为损伤因子)是进行损伤判别、损伤成像和其他监测方法的重要中间参数或依据。对6种典型的损伤因子随信号变化的规律进行了研究,确定了频谱幅度差、空间相位差和差分曲线3种损伤因子以表现信号的幅值、相位和整体变化。通过耳片结构的裂纹扩展实验,验证了这3种损伤因子对疲劳裂纹扩展具有较好的监测效果。The method of structural health monitoring based on guided waves is a research hotspot because of its advantages of being sensitive to small damage and being able to monitor both online and offline. The degree of the change of the guided wave signal(generally called damage index) is an important intermediate parameter for damage identification, damage imaging and other structural health monitoring methods. In this paper, six different damage indexes are investigated and their ability to track the amplitude and phase variation of the signals is evaluated on the synthetic signals. Three damage indexes are selected to characterize the change of signal, include spatial phase difference for phase change, spectral amplitude for amplitude change and differential curve energy for phase and amplitude change. Finally, the selected indexes is validated on a lug crack monitoring experiment.

关 键 词：结构健康监测 导波 损伤因子 

分 类 号：TB553[理学—物理]