铁镓复合棒换能器设计及非线性驱动研究  

Research on nonlinear driving manner of Galfenol transducer

作　　者：李英明[1,2] 莫喜平[1] 柴勇[1] 潘耀宗[1] 张运强[1] 崔斌[1] 

机构地区：[1]中国科学院声学研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《声学学报》2016年第3期428-434,共7页Acta Acustica

基　　金：国家自然科学基金(11304350);中国科学院青年创新促进会(2014021)资助

摘　　要：提出了一种针对无偏场铁镓换能器非线性驱动方式,该方法通过设计输入电信号函数以匹配磁致伸缩非线性应变函数,从而实现换能器的简谐波输出。通过理论分析,寻找到中低磁场下简单信号实现非线性驱动——半频驱动。研制了复合棒铁镓换能器并在水池进行半频激励测试,结果表明,采用无偏场的半频驱动方式激励换能器在4.2 A电流时声源级达到192 dB,能够无失真工作,实验验证铁镓换能器非线性驱动具有可行性。对高磁场时的非线性驱动进行了理论仿真分析,并设计了非线性驱动信号。A nonlinear driving manner of Galfenol transducer is developed. The transducer can generate a sine wave without a biased magnetic field, by designing a complex electric signal to match the nonlinear magnetostrictive strain. Through theoretical analysis, a simple nonlinear signal at low magnetic field is found to drive the transducer, which is called semi-frequency drive mode, because that the signal frequency is half the frequency of the radiation. A Tonpilz transducer is designed and measured in pool driven by the semi-frequency drive mode. The results show that transducer driven by the semi-frequency dive mode can achieve a source level of 192 dB at 4.2 Amps. The experiment confirmed that nonlinear driving manner of Galfenol transducer is feasible. The nonlinear drive signal at high magnetic field is got through theoretical analysis and simulation.

关 键 词：磁致伸缩 信号函数 简谐波 仿真分析 变函数 磁路分析 理论分析 水听器 超磁致伸缩材料 高磁场 

分 类 号：TB565.1[交通运输工程—水声工程]