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

ZHAO Jiaheng;MO Xiping;CHAI Yong;LIU Yongping;Institute of Acoustics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Beijing Engineering Technology Research Center of Ocean Acoustic Equipment;  
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.
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