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基于机电阻抗技术,采用一种新型压电陶瓷纤维复合材料MFC(Macro-fiber composite),对管道连接处法兰的螺栓工况进行监测实验研究。首先,研究了螺栓扭矩大小对管道法兰结构的阻抗的影响程度。在对螺栓开始施加扭矩时阻抗值变化明显,当扭矩增大到一定程度后,阻抗变化减缓。同时进一步研究了松动螺栓数量与管道法兰结构的阻抗变化之间的关系。结果显示,结构的损伤值随松动螺栓个数的增加呈线性增长。采用均方根偏差统计算法,对在不同工况条件下管道法兰结构处测得的阻抗值进行了有效的分析和处理。结果表明,采用MFC作为压电敏感元件的机电阻抗法,用于管道法兰结构健康监测具有较好的稳定性和应用潜力。
Based on the electromechanical impedance technique, a new type of piezoelectric ceramic fiber composite material MFC (Macro-fiber composite) was used to monitor the bolt working condition of the flange at the pipeline connection. First, the influence of bolt torque on the impedance of pipeline flange structure is studied. When the torque applied to the bolt, the impedance changes obviously. When the torque increases to a certain extent, the impedance changes slowly. At the same time, the relationship between the number of loose bolts and the change of impedance of the pipe flange structure was further studied. The results show that the structural damage value increases linearly with the increase of loose bolts. Using the root mean square deviation statistical algorithm, the impedance values measured at the pipe flange structure under different working conditions were effectively analyzed and processed. The results show that the electromechanical impedance method using MFC as piezoelectric sensor has good stability and potential application in the health monitoring of pipeline flanges.