摘要
为了实现矢量水听器在水面或水下载体上的工程应用,研究了球形壳体障板声散射近场矢量特性。采用弹性薄壳理论结合边界条件导出了球形壳体障板声散射的声压和质点振速表达式,给出相应的声强表达式。数值计算了球形壳体障板声散射的近场特性,重点关注其近场矢量特性。理论分析和数值计算结果表明,由于球形壳体障板的散射作用,声压场和质点振速场表现为复杂的干涉结构;质点振速方向和声源方位不一致;声压和质点振速不再同相;声强方向也不再反映声源方位。结果为矢量水听器在球形载体和球形障板条件下的工程应用提供理论依据。
Here, acoustic vector characteristics of near fields scattered by a spherical shell baffle were investigated. The analytic expressions for the scattered sound pressure and particle vibrating velocity were derived using the elastic thin shell theory. Calculations were presented for the sound pressure, the particle velocity and the sound intensity of the scattered near fields. It was found that the pressure and the sound particle velocity fields near the surface of the spherical shell baffle are characterized by complex interference structures, particle velocity directions and the sound source bearings are not consistent, the phase difference between pressure and particle velocity is not zero, the sound intensity vector does not reflect the sound source bearings. These results provided a basis for application of acoustic vector sensors on board.
出处
《振动与冲击》
EI
CSCD
北大核心
2013年第2期135-139,152,共6页
Journal of Vibration and Shock
基金
国家自然科学基金仪器仪表专项(40827003)
国家自然科学基金面上项目(11074058)
关键词
球形壳体
声散射
矢量特性
spherical shell
acoustic scattering
vector characteristics
