摘要
环境温度变化易引起机电阻抗方法(EMI)结构健康监测的损伤误报,以螺栓组连接的铝板为对象,分别进行了温度对导纳信号的影响实验及温变工况下的螺栓松动损伤识别实验,采用平均绝对偏差与相关系数偏差量化表征导纳信号改变程度,利用信号互相关迭代算法分段补偿温度影响。结果表明,温度变化引起导纳信号的水平偏移,且偏移量随频率与温差的增加而增大,引起损伤指标变化,影响螺栓连接状态判定。通过迭代算法进行温度补偿后,极大程度消除了温度影响,有效提高了螺栓松动损伤识别的敏感程度,避免温度变化引起损伤误报。
Environment temperature changes may easily cause damage misinformation of electromechanical impedance method (EMI) based on structural health monitoring. The influence of the temperature on the admittance signal experiment and the detection of bolt looseness damage under changing temperature condition were conducted respectively on an aluminum plate connected with bolt group. The mean absolute percentage deviation and correlation coefficient deviation metric were used to quantitatively describe the degree of admittance signal change. The iterative algorithm based on the signal cross-correlation was used to compensate the temperature effects in narrow frequency bands. The results show that the changing temperature causes the horizontal deviation of the admittance signal, and the offset increases with the frequency and temperature difference, causing the change of damage index and misinformation of bolt connection status. After compensation, the temperature effect are reduced significantly, and the sensitivity of the detection of bolt looseness damage is improved effectively so that the damage misinformation caused by changing temperature can be avoided.
作者
詹阳磊
肖黎
屈文忠
Zhan Yanglei;Xiao Li;Qu Wenzhong(Department of Engineering Mechanics, Wuhan University, Wuhan 430072, China)
出处
《机械科学与技术》
CSCD
北大核心
2019年第6期821-827,共7页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金项目(51378402)资助
关键词
机电阻抗方法
结构健康监测
螺栓松动
损伤识别
温度补偿
electromechanical impedance method
structural health monitoring
bolt looseness
damage detection
temperature compensation
