摘要
对泵喷推进器导管内外声场采用有限元方法进行了建模及计算,无限远场采用无限元技术进行建模,在考虑声振耦合的条件下,在频率域内从测量点频谱、特征频率声场及噪声指向性等方面分析了特定噪声源下导管对噪声的传播影响。研究表明,导管对低频噪声无明显影响,对较高频噪声能改变其声场指向性及降低其声压级。本文研究成果对进一步进行导管声学设计具有重要指导意义。
The inner and exterior sound-fields of pump-jet propeller duct are modeled and numerical simulated using finite-element method and the infinite sound-field are modeled with infinite-element method.The effects of pump-jet propeller duct on noise propagation characteristic are studied by spectrum of field points,contours of sound pressure field and SPL directivity in frequency domain with the effects of vibration-acoustic coupled characteristics.The results shows that the duct has not distinct effects on noise propagation characteristics under low frequency.The directivity is transformed and sound pressure level is debased exceed the bound of low-frequency.
出处
《舰船科学技术》
2011年第8期20-23,共4页
Ship Science and Technology
关键词
泵喷推进器
导管
声传播
pump-jet propeller
duct
noise propagation
