• 船舶海洋与建筑工程 •

### 开式呼吸蛙人专用氧气瓶声散射特性

1. 广东海洋大学 电子与信息工程学院, 广东 湛江 524088
• 收稿日期:2021-03-11 出版日期:2022-06-28 发布日期:2022-07-04
• 作者简介:张培珍(1972-),女,教授,山东省胶南市人,研究方向为水中目标声散射与水声信号处理. 电话(Tel.):13360127048;E-mail: zpzhen7242@163.com.
• 基金资助:
国家自然科学基金(11974084);广东省科技创新战略专项资金项目计划(2020A1414050058);湛江市非资助科技攻关专题(2020B01321)

### Sound Scattering Characteristics of Oxygen Cylinder for Open Breathing Diver

ZHANG Peizhen(), LIN Fang

1. College of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, Guangdong, China
• Received:2021-03-11 Online:2022-06-28 Published:2022-07-04

Abstract:

This paper aims to solve the problem of the oxygen cylinder contribution to the overall scattering intensity of the open breathing diver, which is the basis for mastering the accurate prediction and identification of the diver. A two-dimensional finite element axisymmetric model of 3D-object with non-axisymmetric excitation is constructed. The numerical solution to the far-field frequency characteristics of the acoustic scattering by the object with different azimuths is obtained by using the acoustic-solid coupling multi-physical interface in frequency domain. The reason and the estimation formula of the bright fringe at the resonance frequency are given. Under the assumption of the linear acoustics, the numerical solution to finite element method (FEM) is taken as the system function, and the linear frequency modulation signal with the same bandwidth is taken as the input signal of the system. The echo simulation in time domain can be obtained based on the convolution theorem. Combining the bright spot model and the elastic circumferential wave theory, the precise prediction model of the distance-angle echo in time domain is proposed. The results show that the main factors that affect the strength of the echo include the mirror reflection and the angular reflection. The additional bright spots and circumferential waves generated by the fine structures such as valves and spherical cap have a non-negligible influence on the frequency response characteristics in different azimuths. The validity of the echo prediction and resonance frequency characteristics is verified by the lake experiment in monostatic mode.