Title: Outer cavity Janus-Helmholtz underwater acoustic transducer

Author(s): SANG Yongjie; LAN Yu; WU Tong; DING Yuewen;

Affiliation(s): Acoustic Science and Technology Laboratory, Harbin Engineering University, et al.

Abstract: The outer cavity Janus-Helmholtz with sound insulation layer is presented for obtaining the capacity of high-power non-directional transmitting. The radiation efficiency and directivity in the 0 degrees direction can be improved when the radiation mode is changed by laying sound insulation layer. The operating bandwidth can be expanded effectively by the dual mode coupling between the cavity vibration and longitudinal vibration of Janus transducer. A prototype is designed by finite element method. Test results show that the results are in good agreement with the design results. Compared with inner cavity Janus-Helmholtz transducer, acoustic radiation performance of outer cavity Janus-Helmholtz underwater acoustic transducer in the 0 degrees direction has been significantly improved.