摘要
以舰船流固声耦合理论为基础,基于势流理论,开发了工程化的舰船湿模态附连水质量三维计算程序,将计算值与理论值、经验值及有限元数值解进行对比分析,验证了程序的有效性和合理性。在此基础上,提出了一种计及流固耦合效应的舰船"声平衡"分析方法,研究了船—机—桨多点激励下船体—基座—设备间的耦合结构振动和水下声辐射。结果表明:舰船艏部自噪声随振源相对位置变化出现峰谷交替的趋势,通过优化主机位置可以降低艏部自噪声;舰船主辅机选型应充分考虑船体—基座—设备之间以及设备间的声匹配,兼顾多点激励力幅比和激励频率比。
Based on the theory of ship fluid-structure-sound coupling interaction, the engineering three dimensional program was explored to compute the entrained water mass of ship wet mode on the basis of Potential Flow Theory. The calculated results were compared with the theoretical value, empirical value and numerical value of FEM to verify the validity and rationality of the program. A method of ＂sound balance＂ was proposed to analyze the coupling vibration of hull-base-equipment which is excited by ship-equipment-paddle as well as underwater sound radiation. The results show that the sound pressure of stem with engine location takes on peak-to-valley tendency, which can be reduced through the opti- mum matching site. As for the selection of ships＂ main and auxiliary engines, the sound balance of hullbase-equipment as well as that of equipment needs to be considered, and this method must give attention to multi-support excitation force ratio and the frequency ratio. This article aims to provide reference for acoustic design of hull structure.
出处
《中国舰船研究》
2009年第5期1-7,共7页
Chinese Journal of Ship Research
基金
国防重点预研项目
国际科技合作项目(2007DFR80340)
高等学校博士学科点专项科研基金(20070217074)
关键词
舰船水声设计
总体声学性能
声平衡
水下辐射噪声
多点激励
耦合振动
附连水质量
ship acoustic design
general acoustic performance
sound balance
underwater radiationnoise
multi-support excitation
coupled vibration
entrained water mass
