Fe-Ga合金发音振子换能器的多场耦合模型
Multi-field coupling model of vocal vibrator transducer of Fe-Ga alloy

建立了Fe-Ga合金弓张结构发音振子换能器电场、磁场和固体力学场的多场耦合模型，研究了发音振子换能器磁场强度、磁感应强度和应变分布情况，并进行了换能器在不同频率下的磁场强度分析和模态分析。分析发现，随着频率的增高，Fe-Ga合金发音振子换能器的磁场强度逐渐减小，计算得到换能器的共振频率为984 Hz。测试了Fe-Ga合金换能器中的核心元件Fe-Ga合金的磁场强度与应变的关系，当磁场强度饱和值为40 kA·m-1时，应变为70×10-6。搭建了磁致伸缩材料磁特性测试系统，测试了Fe-Ga合金磁场频率为5、20、50 Hz的磁滞曲线，并测试了Fe-Ga合金的应变随频率的变化曲线，实验结果与换能器中Fe-Ga合金的应变仿真结果一致。
In this paper, the multi-field coupling model of electric field, magnetic field and solid mechanic field for the bow-shaped vocal vibrator transducer of Fe-Ga alloy is established. The distributions of magnetic field intensity, magnetic induction intensity and strain of the transducer are studied, and the magnetic field intensities at different frequencies and the modal characteristics of the vocal vibrator transducer are analyzed. It is found that the magnetic field intensity of the bow-shaped vocal vibrator transducer of Fe-Ga alloy is reduced with the increase of frequency, and the resonant frequency of the transducer is calculated to be 984 Hz. The relationship between the magnetic field strength and the strain of the core component Fe-Ga alloy in the transducer is tested. When the saturation value of the magnetic field is 40 kA/m, the strain is 70×10-6. The hysteresis curves of Fe-Ga alloy at the magnetic field frequencies of 5 Hz, 20 Hz and 50 Hz are measured by the magnetic property testing system for magnetostrictive material. And the frequency response curve of Fe-Ga alloy rod is tested, the experimental result is consistent with the strain simulation result of Fe-Ga alloy in the transducer.