|
| 基于自相关函数的非接触结构损伤识别方法研究及应用 |
| Research and Application of Non-Contact Structural Damage Identification Method Based on Autocorrelation Function |
| 投稿时间：2023-11-22 修订日期：2024-03-18 |
| DOI： |
| 中文关键词: 结构损伤识别 时域振动响应 相关函数 灵敏度分析 数字图像相关 |
| 英文关键词:structural damage detection time domain response correlation function sensitivity analysis digital image correlation |
| 基金项目:国家自然科学基金项目（11972014）；江苏省自然科学基金青年基金(BK20190834)；江苏大学高级人才基金(19JDG027) |
|
| 摘要点击次数: 153 |
| 全文下载次数: 0 |
| 中文摘要: |
| 为了减小传感器的安装和布置对结构损伤识别结果的影响，提出了一种利用响应自相关函数的非接触损伤识别方法。由结构各测点归一化后的自相关函数最大值作为损伤指标，其对局部刚度的灵敏度分析表明该损伤指标在损伤位置附近会存在突变，说明所提出的损伤指标对损伤位置的敏感性。6层剪切框架结构的损伤识别仿真算例表明使用不同类型响应均能准确定位损伤，其与灵敏度分析结果良好的一致性验证了所提出损伤指标的有效性。结合数字图像相关技术，基于高速相机的6层剪切框架结构以及基于智能手机的9跨桁架桥结构的非接触损伤识别实验结果表明所提出的损伤识别方法对于不同响应采集仪器、不同结构均具有良好的适应性和鲁棒性：不仅能够准确定位损伤，还可以反映损伤的严重程度。相较于传统接触式传感器采集响应，所提出的非接触损伤识别方法无需组网布设，不会影响结构动态特性等优势在实际工程结构的在线健康监测中具有良好的应用前景。 |
| 英文摘要: |
| In order to reduce the influence of sensor installation on damage identification, a non-contact damage identification method based on the auto-correlation function is proposed. The maximum value of the auto-correlation function of the vibration response from different measurement point is normalized as the damage index, sensitivity analysis of which to the local stiffness shows there is a sudden change around the damage location, indicating its sensitive to the damage. Numerical simulation results of the damage identification for a 6-story shear frame shows the damage location can be correctly identified using different kind of vibration response. The well agreement between the results from sensitivity analysis and damage identification shows the effectiveness of the proposed damage index. Non-contact damage identification experiment of a 6-story shear frame using high-speed camera and a 9-span truss bridge using mobile phone verify the results from numerical simulation and show the proposed damage index can not only locate the damage but also indicate the damage severity. Compared with the traditional damage identification method based on the contact sensor, the proposed damage identification method has the advantage of non-contact and low cost. Since it is directly carried out by the response signal, it has the potential for the online structural health monitoring. |
| 下载PDF阅读器 |
| 关闭 |
