摘要
舱壁与压载是各种水下潜器及潜艇的重要结构形式,研究其对环肋圆柱壳振动声辐射的影响是很有必要的。本文研究了流场中带压载及舱壁的有限长环肋圆柱壳在简谐径向点激励作用下振动与声辐射特性。将舱壁等价为施加在圆柱壳上的线力,舱段底部的压载当做附加质量平摊到壳板上,只考虑其惯性力的影响。基于F lugge薄壳理论和Helmholtz方程,导出加筋圆柱壳的耦合振动方程,计算了耦合结构表面均方速度级和辐射声功率级,分析了舱壁和压载对圆柱壳振动和声辐射的影响。得出以下结论:舱壁对壳体振动的影响要分频段讨论,而对声辐射的影响可以忽略不计;在高频段,压载可有效起到减振降噪的作用。
Bulk and ballast are very important structural forms of submarine and various underwater vehicles.It is necessary to study the impact of bulk and ballast on vibration and acoustic radiation of ringstiffened cylindrical shell.The characteristics of vibration and acoustic radiation from submerged finite ringstiffened cylindrical shell with bulkhead and ballast excited by harmonic radial point driving force is discussed.Bulkhead is addressed as liner force acting on the shell.The ballast on the bottom of shell is considered as an extra weight which influences only on inertia force.Based on Flugge shell theory and Helmholtz equation,the coupled fluid-solid equation of stiffened cylindrical shell is derived.The radiant power and quadratic velocity of the coupled structure are given.The impact of bulkhead and ballast on acoustic radiation of finite cylindrical shell is analyzed.A conclusion：the impact of with or without bulkhead on vibration should be discussed according to the frequency range,and the impact on the acoustic radiation can be ignored.Ballast can effectively reduced acoustic in high frequency.
出处
《舰船科学技术》
2010年第11期21-25,共5页
Ship Science and Technology
基金
国家自然科学基金资助(50805055)
关键词
有限长
环肋圆柱壳
舱壁
压载
振动
声辐射
finite
ring-stiffened cylindrical shell
bulkhead
ballast
vibration
acoustic radiation
