摘要
针对导波在板状结构的多损伤监测中存在损伤定位精度低和邻近损伤区分困难的问题,利用有限元仿真揭示了损伤位置对导波信号的散射作用规律,基于导波信号本质特征提出了一种新的损伤指数——幅值相对变化系数(Relative amplitude variation coefficient,RAVC),结合概率损伤成像算法实现损伤成像。试验结果表明,RAVC能够准确地识别出单个、两个和三个损伤的数量和位置信息。与信号差异系数和功率谱密度两种损伤指数相比,RAVC的定位误差更小,具有监测多个损伤和区分邻近损伤的能力,从而提高了板状结构多损伤监测的精度和分辨率。
Multi-damage monitoring of guided waves in plate structures is difficult because of low damage localisation accuracy and difficulty in distinguishing neighbouring damages.Finite element simulation is used to reveal the scattering effect of damage location on the guided wave signals.And based on the intrinsic characteristics of guided wave signals,a new damage index-relative amplitude variation coefficient(RAVC)is proposed.Reconstruction algorithm for probabilistic inspection of damage is utilized to obtain damage image.The experimental results show that RAVC can accurately identify the number and location information of single,two and three damages.Compared with the two existing damage indexes,signal difference coefficient and damage factor of power spectral density,RAVC has smaller localization error and has the ability to monitor multiple damages and distinguish neighboring damages,thus improving the accuracy and resolution of multi-damage monitoring in plate structures are improved.
作者
徐晓强
谭志文
胡宏伟
向昊南
XU Xiaoqiang;TAN Zhiwen;HU Hongwei;XIANG Haonan(College of Mechanical and Vehicle Engineering,Changsha University of Science and Technology,Changsha 410114;Hunan Provincial University Key Laboratory of Intelligent Detection and Control Technology for Engineering Equipment,Changsha University of Science and Technology,Changsha 410114)
出处
《机械工程学报》
北大核心
2025年第14期130-141,共12页
Journal of Mechanical Engineering
基金
国家自然科学基金(52005052,52075049)
湖南省教育厅科学研究(22B0349)资助项目。
关键词
超声导波
损伤指数
多损伤
结构健康监测
ultrasound guided wave
damage index
multiple damage
structural health monitoring
