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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 method is proposed for the unbiased iron gallium oxide transducers. The proposed method realizes the harmonic output of the transducer by designing the input electrical signal function to match the magnetostrictive nonlinear strain function. Through theoretical analysis, it is found that the simple signal in medium and low magnetic fields can be used to realize the nonlinear driving - half-frequency driving. The composite rod-gallium-iron transducer was developed and the half-frequency excitation test in the water tank was carried out. The results show that the excitation source can reach 192 dB at 4.2 A with half-wave drive without bias and can work without distortion It is feasible to verify the nonlinear driving of iron gallium oxide transducers. The theory of nonlinear driving in high magnetic field is simulated and the nonlinear driving signal is designed.