铁镓Janus-Helmholtz换能器非线性驱动  

The nonlinear driving manner of iron-gallium Janus-Helmholtz transducer

作　　者：赵佳恒 莫喜平[1] 柴勇[1,3] 刘永平 ZHAO Jiaheng;MO Xiping;CHAI Yong;LIU Yongping(Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Beijing Engineering Technology Research Center of Ocean Acoustic Equipment,Beijing 100190,China)

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 [3]北京海洋声学装备工程技术研究中心,北京100190

出　　处：《应用声学》2023年第1期84-92,共9页Journal of Applied Acoustics

摘　　要：利用磁路法理论分析了磁阻对铁镓驱动磁场的影响,结果表明磁路中无永磁体时铁镓驱动磁场是有永磁体时的5倍以上,结合铁镓材料近似线性区小的特点,提出了一种无偏场非线性驱动方式。首先利用帕德逼近方法近似铁镓材料的磁化过程,得到磁场强度与磁致伸缩应变的关系,进而得到驱动电信号表达式,在此基础上提出了铁镓换能器的非线性驱动模型。设计研制了无偏场铁镓Janus-Helmholtz换能器样机,通过振动特性实验分析验证非线性驱动模型的可行性,最后在水中测试了换能器的发射性能。测试结果表明,采用无偏场非线性驱动的换能器在驱动电流为9.4 A时,声源级可达到198.2 dB,相对于永磁偏置磁场的换能器,声源级高了4 dB,发射性能得到了明显的提升。Combining the characteristics of the iron-gallium material with a small approximate linear region,an unbiased field nonlinear driving method is developed. Because the magnetic circuit method is used to analyze the influence of magnetoresistance on the iron-gallium driving magnetic field, it is calculated the irongallium driving magnetic field without permanent magnets in the magnetic circuit and it is more than five times the that of permanent magnets. First, the Pader approximation method is used to approximate the magnetization process of the iron gallium material, and the relationship between the magnetic field strength and the magnetostrictive strain is obtained, and then the driving electric signal expression is obtained. On this basis, a nonlinear driving model of the iron gallium transducer is proposed. An unbiased field Fe-Ga Janus-Helmholtz transducer prototype was designed and developed. The feasibility of the nonlinear driving model was verified through the experimental analysis of vibration characteristics. Finally, the transducer was tested in water. The results show that the source level of the transducer with unbiased field nonlinear drive can reach 198.2 dB when the driving current is 9.4 A, which is 4 dB higher than the transducer with permanent magnet bias magnetic field. The launch performance has been significantly improved.

关 键 词：铁镓材料 非线性驱动 磁路分析 帕德逼近 

分 类 号：O427[理学—声学]