论文部分内容阅读
为获得具有大功率无指向性发射特性的水声换能器,提出了一种外液腔式Janus-Helmholtz结构。通过设置隔声层改变换能器的声辐射模式,从而改善声辐射效率和无指向性方向的声辐射能力,并利用外液腔振动和Janus换能器纵向振动耦合实现宽带发射。基于有限元法设计了一只工作频段为1.1~3.5 kHz的外液腔式Janus-Helmholtz换能器试验样机。样机测试结果显示与设计结果符合得较好,与内液腔式相比,外液腔式Janus-Helmholtz水声换能器在0°方向的声辐射能力得到了显著改善。
In order to obtain an underwater acoustic transducer with high-power non-directional emission characteristics, an external liquid-chamber Janus-Helmholtz structure is proposed. By changing the acoustic radiation mode of the transducer by setting the sound insulation layer, the acoustic radiation efficiency and the sound radiation ability in the non-directional direction are improved, and the broadband emission is achieved by using the external liquid chamber vibration and the longitudinal vibration coupling of the Janus transducer. Based on the finite element method, an experimental prototype of Janus-Helmholtz transducer with an external liquid chamber of 1.1 ~ 3.5 kHz was designed. The prototype test results show good agreement with the design results. Compared with the inner cavity type, the acoustic radiation ability of the outer cavity Janus-Helmholtz hydro-acoustic transducer at 0 ° direction is significantly improved.