超磁致伸缩换能器的数值模拟及试验研究

doi:10.16180/j.cnki.issn1007-7820.2019.09.008

摘要/Abstract

摘要：

针对传统长方体Terfenol-D振子不能直接与管道任意表面耦合的问题,设计了U型弹性基底与Terfenol-D振子复合的新型结构,能够更好的与管道耦合。对新型结构振子进行数值模拟及瞬态响应分析,确定新型复合结构振子长度为25 mm。用该尺寸的坡莫合金为基底的新型结构换能器和传统的压电陶瓷换能器分别检测同一管道,试验结果表明,以坡莫合金为基底的新型结构的磁致伸缩换能器的缺陷回波幅值是压电陶瓷换能器的1.5倍,进一步验证了新型复合结构设计的正确性。

关键词: 超磁致伸缩, 超声导波, 换能器, 复合结构, 谐振频率, 数值模拟

Abstract:

To solve the problem that the rectangular Terfenol-D oscillator cannot be coupled with any surface of the pipeline, a new structure is desnd transient response analysis were performed on the oscillator with the new structure, and the length of the oscillator with the new composite igned to combine the U-type base with the Terfenol-D oscillator to make it better coupled with the pipeline. Numerical simulation astructure was confirmed to be 25 mm. The same pipe was tested with a 25 mm new structure transducer and a piezoelectric ceramic transducer. The experimental results show that the flaw echo amplitude value of the magnetostrictive transducer with the new structure is 1.5 times that of the piezoelectric ceramic transducer, further verifying the correctness of new composite structure design.

Key words: giant magnetostrictive, ultrasonic guided wave, transducer, composite structure, resonant frequency, numerical simulation

中图分类号:

TP212.1

姜银方,刘兵,雷玉兰,陈波,郭永强,胡华健. 超磁致伸缩换能器的数值模拟及试验研究[J]. 电子科技, 2019, 32(9): 37-41.

JIANG Yinfang,LIU Bing,LEI Yulan,CHEN Bo,GUO Yongqiang,HU Huajian. Numerical Simulation and Experimental Study of the Magnetostrictive Transducer[J]. Electronic Science and Technology, 2019, 32(9): 37-41.

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参数	值
杨氏模量	(2.5~3.5)×10¹⁰ N/m²
泊松比	0.3
密度	9 250 kg/m³

材料	密度/kg·m^-3	弹性模量/Pa	泊松比
黄铜	8 270	9.2 ×10¹⁰	0.33
铝	2 690	2.15 ×10¹¹	0.345
45钢	7 800	2.1 ×10¹¹	0.285
坡莫合金	8 300	1.8 ×10¹¹	0.35