接地扁钢检测的电磁超声SH导波换能器优化设计OA

Targeting at the problem of low transducer efficiency of electromagnetic ultrasonic SH guided wave transducer with traditional PPM array permanent magnet structure,a new type of transducer based on Halbach array permanent magnet is proposed to enhance the de-tection capability of defects on grounded flat steel.Firstly,a three-dimensional model of the structure of PPM and Halbach array perma-nent magnet is established by using the finite element software of COMSOL,and the key parameters of the transducer are optimized and designed through orthogonal test.The results of the study show that the maximum perpendicular magnetic flux density of Halbach array permanent magnet is increased by 51.6％compared with that of the PPM array permanent magnet,and the Halbach array permanent mag-net exhibits a good unilateral effect,which significantly improves the utilization efficiency of the vertically biased magnetic field.Within the selected parameters,increasing the length and number of permanent magnets and the number of turns of the coil can improve the am-plitude of the electromagnetic ultrasound signals,and the amplitude of the optimized signals is improved by 45.9％compared with that be-fore optimization.Finally,the detection performance of the transducer in practical applications is verified by experiments,and the experi-mental results are high consistent with the simulation results,which fully proves the feasibility of the proposed optimized design scheme.