基于压电阻抗技术的管道多裂纹损伤识别研究  

Multiple Crack Detection of Pipeline Using Impedance-based Structural Health Monitoring Techniques

作　　者：杜国锋[1] 张志忠[1] 张东山[1] 

机构地区：[1]长江大学城市建设学院,荆州434023

出　　处：《武汉理工大学学报》2013年第10期101-105,共5页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(51378077);中国石油科技创新基金(2011D-5006-0605);湖北省教育厅科技计划重点项目(D20131205)

摘　　要：为了解基于压电阻抗技术识别管道多裂纹损伤的可行性,进行管道多裂纹损伤识别试验。利用机械加工方法模拟裂纹产生和发展过程。实测第1条裂纹和第2条裂纹在各种损伤深度情况下压电陶瓷传感器的阻抗谱曲线,分析各种损伤状态下的曲线特征。根据实验数据计算均方根偏差统计特征指标,分析裂纹损伤程度与统计特征指标之间的规律。结果表明,随着裂纹损伤程度加剧,导纳频谱曲线峰值频率下降,阻抗值减小;基于压电阻抗方法的损伤识别具有很强敏感性,压电片距离损伤位置越近识别效果越好;均方根差特征指标能有效判断钢管裂纹损伤状况。In order to understand the feasibility of identifying pipeline multiple crack damage using impedance-based structural health monitoring techniques, the crack damage identification experiment was carried based on piezoelectric impedance. The processes of crack damage on pipeline are simulated by machining methods. PZT impedance spectroscopy curves of piezoelectric ceramic are measured in different damage conditions of the first and second cracks, and curve char- acteristics was analyzed. According to the experiment data statistics damage metrics such as Root Mean Square Deviation （RMSD） has been proposed, the change trend of crack damage degree and statistics characteristic indices were analyzed. The experimental results showed that with the aggravation of crack damage degree, piezoelectric admittance curve gradu- ally peak frequency decreases and impedance values decrease. Damage detection based on piezoelectric impedance method has strong sensitivity, identification effect is better when piezoelectric patches are closer to the damage location. Statistics characteristic indices such as RMSD can effectively judge the crack damage of pipeline.

关 键 词：压电陶瓷 压电阻抗技术 多裂纹损伤 

分 类 号：TU317.01[建筑科学—结构工程]