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.
Abstract
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.
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