纵桁分布方式对结构振动与声辐射的影响  

Effect on Structural Vibration and Sound Radiation Due to Distribution of Longitudinal Beams

作　　者：刘帆[1] 周其斗[1] 纪刚[1] 黄振卫[1] 段嘉希 

机构地区：[1]海军工程大学,武汉430033

出　　处：《兵器装备工程学报》2016年第1期142-146,共5页Journal of Ordnance Equipment Engineering

摘　　要：研究纵桁分布方式对结构振动与声辐射的影响,对于实际水下大型结构物的声学分析和优化具有重要的指导意义;以加肋圆柱壳为研究对象,采用了结构有限元耦合流体边界元算法,研究了不同纵桁间距分布方式对结构振动与声辐射的影响;数值计算结果表明:对于本算例,在频率大于400 Hz时,纵桁的存在对加肋圆柱壳水下的减振和降噪有良好的效果;其中,等比增加间距的纵桁分布方式对结构减振和降噪效果最好;但纵桁的存在增大了结构在高频时的辐射效率,同时也增加了结构重量,这在设计时是需要考虑的。The investigation of the influence of the distribution of the longitudinal beams on vibration and acoustic radiation of the submarine is of great significance for acoustic analysis and structure optimization design. A structural finite element coupled with fluid boundary element method （FEM-BEM） was adopted to investigate the effect on the vibration and acoustic radiation of a stiffened cylindrical shell due to the dis- tribution of the longitudinal beams. Numerical calculation points out that longitudinal beams also can decrease the cylindrical shell＇ s noise and vibration when the frequency is above 400 Hz for this calculate example. And distribution of the longitudinal beams with geometric intervals makes the best effect on the structure. However, longitudinal beams increase cylindrical shell＇s radiation efficiency during high frequency, and in addition, its weight adds to the structure, which ought to be considered in design.

关 键 词：加肋圆柱壳 纵桁 声辐射 分布方式 有限元-边界元 

分 类 号：U661.1[交通运输工程—船舶及航道工程]