稀土IV型弯张换能器研究

IV型弯张换能器低频发射时具有尺寸小、重量轻的特点,是一种常用的水下低频大功率声源。稀土超磁致伸缩材料相较于压电陶瓷拥有更大的应变量和能量密度,并且杨氏模量较小,可以有效降低换能器谐振频率。利用稀土超磁致伸缩材料作为激励材料,设计了一种低频IV型弯张换能器,对其静态磁场和动态磁场进行了分析,构建出双棒式磁路,并使用有限元分析软件进行了换能器的结构建模与计算。根据计算结果制作了稀土IV型弯张换能器样机,测试结果表明所设计的换能器与仿真结果吻合较好,水中谐振频率为370 Hz,最大声源级为196 d B,能够实现低频、大功率发射。

Research of a Class IV rare-earth flextensional transducer

Class IV flextensional transducer with features of small size and light weight is a common underwater low frequency and high power source. Compared to piezoelectric ceramic, the rare-earth magnetostrictive material has larger strain and energy density, and lower young''s modulus, which can effectively reduce the resonant frequency of the transducer. A low frequency IV flextensional transducer driven by using rare-earth magnetostrictive material is designed. Through the analyses of static and dynamic magnetic fields, a magnetic circuit structure of dual rods type is built, and the transducer is modeled and calculated with finite element software. Based on the calculation results, a Class IV flextensional transducer is manufactured, and the simulation and experimental results are in good agreement. It is shown that the transducer is characterized by low frequency and high power, which means that the resonant frequency in water is 370 Hz, and the sound source level achieves 196 dB.