摘要
深海环境下,甚低频声场的空间分布特性和频率有关,明确其形成的物理机理是进行声呐系统设计、目标定位的基础。本文利用射线-简正波理论,分析了深海中不同频率的声场特性,研究表明:不同频率下波导中占主导地位的模态(声线)能量大小不同,这会导致声传播损失大小随频率变化而变化;不同频率下占主导地位的模态干涉周期(声线水平跨距)不同,这会导致声场的空间分布规律随频率变化而变化;声源深度不同,声场空间分布特性也不同。
The spatial distribution characteristics of a very low frequency(VLF)sound field are known to be frequency-dependent in deep water.The physical mechanism of their formation is the basis of sonar system design and target positioning.In this paper,we study the characteristics of sound fields at different frequencies in deep water based on the ray-normal mode theory.The results show that:1)The amounts of energy of the dominant mode(ray)in the waveguide differ at different frequencies,which results in variations in the sound transmission loss with frequency.2)The dominant mode interference periods(horizontal ray spans)also differ at different frequencies,which results in variations in the spatial distribution of the sound field with frequency.3)The distribution characteristics of sound fields with different source depths differ.The conclusions presented in this paper are only valid under VLF and deep-water conditions.The sound field characteristics in higher frequency conditions must be further investigated.
作者
张海刚
马志康
李楠松
刘清宇
ZHANG Haigang;MA Zhikang;LI Nansong;LIU Qingyu(College of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 150001,China;Naval Research Institute,Beijing 100161,China;Key Laboratory of Marine Information Acquisition and Security(Harbin Engineering University),Ministry of Industry and Information Technology,Harbin 150001,China;Acoustic Science and Technology Laboratory,Harbin Engineering University,Harbin 150001,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2020年第10期1457-1463,共7页
Journal of Harbin Engineering University
基金
国防科技创新特区项目.
关键词
深海
甚低频
射线-简正波
传播损失
会聚区
模态干涉周期
声线跨距
掠射角
数值模拟
deep water
very low frequency(VLF)
ray-normal mode
transmission loss
convergence zone
mode interference periods
ray span
grazing angle
numerical simulation
