基于压电主动传感法的钢管螺纹接头松动监测

摘要

Aiming at the lack of research on the looseness monitoring at pipeline connections in pipeline engineering,the paper conducts monitoring test on the looseness at screwed connections of steel pipes widely used in underground urban pipe network with piezoceramic-based active sensing approach.As piezoceramic sensors are used at steel pipeline and external screwed connectors,if looseness occurs,the relative contact area between the pipeline and the external connector will decrease and their relative distance will change,finally affecting the transmission and attenuation of stress waves between sensors.Based on this,the paper deduces a theoretical relationship between the degree of looseness and the attenuation of stress wave signals and verifies the effectiveness of the proposed method through indoor test.Results show that the piezoceramic-based active sensing approach can better monitor and analyze the looseness at screwed connectors of pipeline.Five repeated tests also verify the stability and robustness of the proposed method,thus it can tentatively apply for looseness monitoring in pipeline engineering.%针对管道工程中缺乏对接头部位松动监测的相关研究,该文利用压电陶瓷传感技术对城市地下管网中广泛应用的钢管螺纹连接松动进行监测实验.在钢管管道和外接螺纹接头处分别粘贴压电陶瓷传感器,松动发生时,管道和外接头间的相对接触面积减小、相对距离发生变化,最终影响应力波在传感器之间的传播和衰减.基于此,该文从理论上推导螺纹松动程度与应力波信号衰减之间的对应关系,并通过室内实验,验证所提方法的有效性,即压电主动传感法可以较好地实现对管道螺纹接头部位松动病害的监测和分析.此外,5次重复性实验进一步验证所提方法监测效果的一致性和鲁棒性,可为管道工程监测领域提供参考.