关键词: 超磁致伸缩材料, 换能器, 指数形变幅杆, 声辐射, 动态特性

Abstract: Terfenol-D bar is used in actuator and simplified as one-to-one linear input/output system for the equivalent dynamic magnetic-mechanical model. Based on test data of magnetostrictive material under compression, an exponent type horn of the magnetostrictive transducer is designed, the geometric size based on actual resonance, magnifying coefficient of amplitude, distributing functions of vibration speed and stress and position of nodal section are calculated and a natural frequency equation of the exponent type horn of magnetostrictive transducer is derived designing the magnetostrictive transducer. With the alloy TeDyFe as giant magnetostrictive material tested including its static mechanical properties, a new kind of giant magnetostrictive transducer was made with its dynamic properties tested as well. In such tests the transducer was proved that it had a wide frequency range with wave shape prominent apex and higher launching power and that a proper attached weight ratio could increase the conversion efficiency between electric and acoustic energies.