基于导波双点传感的管道结构缺陷无基准检测

Guided wave and two-point sensing based non-benchmark pipeline structural damage detection

核电石油化工等领域中的管道结构缺陷监测是关系到系统整体性安全的重要环节,也是结构健康监测领域的研究热点。管道结构中的超声导波传播复杂,损伤监测与检测难度大。研究双点法管道结构缺陷的无基准监测方法,采用单点激励下的等效双点传感信号响应对称性,消除导波多模、频散以及多径效应带来的影响,分析提取出损伤引起的信号变化,从而确定损伤特征参数,进而实现损伤的无基准检测。在典型钢管道结构上的实验验证表明,该方法在合适的中心频率下可通过实测结构响应信号对,实现无基准损伤定位和检测,实现较为便捷,对于实际工程应用具有较好的意义。

Pipeline structure is one of the most important parts in engineering structures,such as nuclear plants,and its fault monitoring is also important for the safety of the working system.Thus,Pipeline structural health monitoring is a research hotspot in the field of structural health monitoring.Guided wave based pipeline damage detection is usually difficult due to the complicated propagation of guided wave.Guided wave and twopoint sensing based baseline free pipeline structural damage detection is proposed and researched in this paper.The equivalent two-point sensing signal response symmetry under single excitation is adopted to eliminate the influence of multi-mode,dispersion and multi-path effect in guided wave propagation.The signal changes caused by damage are analyzed and extracted,so as to determine the damage characteristic parameters,and then to realize the non-benchmark damage monitoring.The experimental verification on typical steel pipe structure showed that the method can realize the base line free damage location and detection through themeasured structural response pairs under the appropriate center frequency, which is convenient and has certainsignificance for practical engineering application.