摘要
[目的]螺旋桨“水母模态”被激发可诱导出强烈的低频窄带声辐射。在此基础上,分析“水母模态”的第2种机制:由纵振传递引起的艇体结构振动声辐射−我们称之为潜艇的“水母效应”。[方法]基于等效声源法建立螺旋桨直发声偶极子模型;根据耦合有限元/边界元方法建立桨-轴-艇系统振动声辐射数值模型。[结果]研究表明:螺旋桨“水母模态”被激直发声因偶极子叠加而显著增强;螺旋桨低频弹性模态将桨-轴-艇系统的动态力传递显著放大,使纵振辐射水平大幅提高成重要声特征;横向激励与螺旋桨重频模态关联。[结论]研究揭示的潜艇“水母效应”概念内涵及发声机理,可为低噪声螺旋桨设计及舰船推进系统噪声控制提供基础理论,具有重要的理论和工程价值。
[Objectives]Arousing the"Jellyfish mode"of a propeller can lead to strong low-frequency,narrow band sound radiation.On this basis,the second sound radiation mechanism of the"Jellyfish mode"has been investigated.The propeller excitation force,amplified by the elasticity of the propeller and shaft,is transmitted to the hull and results in the axial vibration and sound radiation of the hull,which is known as the"Jellyfish effect"of a submarine.[Methods]The direct acoustic radiation analysis model of the propeller is built based on the noise source equivalent method,and the FEM/BEM coupling method is utilized to analyze the vibration and sound radiation characteristics of the propeller-shaft-hull coupling system.[Results]The analysis results show that the superposition of the sound radiation induced by the"Jellyfish mode"of the propeller will be significantly enhanced.The propeller excitation force transmission will be amplified when the"Jellyfish mode"of the propeller is aroused,and the axial vibration and sound radiation of the propeller-shafthull coupling system will increase significantly,to become an extremely significant sound radiation signature;there is also a relation between the repetition frequency mode of the propeller and lateral propeller excitation force.[Conclusions]The study revealed the concept and sound radiation mechanism of the"Jellyfish effect"of a submarine.The research above can provide theoretical support for quiet propeller design and propulsion system noise control,which are of great significance to both the theory and practical engineering.
作者
吴崇建
雷智洋
徐鑫彤
王晴
王春旭
WU Chongjian;LEI Zhiyang;XU Xintong;WANG Qing;WANG Chunxu(China Ship Development and Design Center,Wuhan 430064,China;National Key Laboratory on Ship Vibration&Noise,Wuhan 430064,China)
出处
《中国舰船研究》
CSCD
北大核心
2020年第5期154-160,共7页
Chinese Journal of Ship Research
基金
装备发展部专项预研基金资助项目(1501JZJZ0304)。
关键词
螺旋桨噪声
水母模态
水母效应
桨-轴-艇耦合系统
声辐射
propeller noise
Jellyfish mode
Jellyfish effect
propeller-shaft-hull coupling system
sound radiation
