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针对带有不锈钢护套的桥梁缆索磁致伸缩导波现场检测中传感器的安装问题,基于磁致伸缩效应及其逆效应建立了有限元模型,并通过仿真分别研究了不锈钢护套对磁致伸缩导波激励与接收的影响,进而得到不锈钢护套对导波检测信号的影响.通过实验室和实桥实验进行了验证,结果表明:不锈钢护套对磁致伸缩导波的激励过程与接收过程均会造成衰减,激励端与接收端不锈钢厚度对信号衰减的影响趋势基本相同.根据仿真与实验结果得到了可以将磁致伸缩导波传感器安装于不锈钢护套上的激励频率及不锈钢护套厚度的范围,为现场安装提供了指导.
Aimed at the problem of sensor installation in the field testing of magnetostrictive guided wave cable with stainless steel sheath, the finite element model was established based on the magnetostrictive effect and its inverse effect. The effects of stainless steel sheath on magnetostrictive The influence of the guided wave excitation and the receiving, and then the influence of the stainless steel sheath on the guided wave detection signal was obtained.The experiment was verified by laboratory and real bridge experiments. The results show that the excitation process and the receiving process of the magnetostrictive guided wave Will cause the attenuation, and the influence of the thickness of the stainless steel on the receiving side and the receiving side will be basically the same.According to the simulation and experimental results, the excitation frequency and the thickness of the stainless steel sheath on the stainless steel sheath can be obtained The scope of the site installation provides guidance.