Zhou Jinjie, Zhang Hang, Chen Yuepeng, Zhang Jitang
School of Mechanical Engineering, North University of China, Taiyuan 030051, China.
Shanxi Key Laboratory of Intelligent Equipment Technology in Harsh Environment, Taiyuan 030051, China.
Micromachines (Basel). 2024 Oct 15;15(10):1261. doi: 10.3390/mi15101261.
In order to solve the problem that small defects hidden behind pipeline support parts are difficult to detect effectively in small spaces, such as offshore oil platforms, a meander-coil-type dual magnetic group circumferential magnetostrictive guided wave transducer is developed in this paper. The transducer, which consists of a coil, two sets of permanent magnets, and a magnetostrictive patch, can excite a high-frequency circumferential shear horizontal (CSH) guided wave. The energy conversion efficiency of the MPT is optimized through magnetic field simulation and experiment, and the amplitude of the defect signal is enhanced 1.9 times. The experimental results show that the MPT developed in this paper can effectively excite and receive CSH mode guided waves with a center frequency of 1.6 MHz. Compared with the traditional PPM EMAT transducer, the excitation energy of the transducer is significantly enhanced, and the defects of the 2 mm round hole at the back of the support can be effectively detected.
为了解决在诸如海上石油平台等小空间内，管道支撑部件背后隐藏的小缺陷难以有效检测的问题，本文研制了一种曲折线圈式双磁组圆周磁致伸缩导波换能器。该换能器由一个线圈、两组永磁体和一个磁致伸缩贴片组成，能够激发高频圆周水平剪切（CSH）导波。通过磁场模拟和实验对磁致伸缩换能器的能量转换效率进行了优化，缺陷信号幅度提高了1.9倍。实验结果表明，本文研制的磁致伸缩换能器能够有效激发和接收中心频率为1.6MHz的CSH模式导波。与传统的永磁体电磁超声换能器相比，该换能器的激发能量显著增强，能够有效检测支撑件背面2mm圆孔的缺陷。
