摘要
为降低舱壁振动对圆柱壳舱段声振性能的影响,对舱壁展开结构声学设计,并采用阻尼减振理论措施。在舱壁表面敷设阻尼材料以减小结构振动响应;利用阻抗失配原理,在舱壁根部与壳体连接处添加贴板支撑垫以增大振动波传递损失。采用FEM/BEM法对改进舱壁前后舱段的声振性能进行数值计算,分析舱壁的振动控制效果。结果表明:舱壁敷设阻尼材料和添加贴板支撑垫不仅可有效降低舱段振动和声辐射,也进一步地隔离振动波向舱段壳体的传递,是一种较好的减振降噪措施。
In order to depress the effect of bulkhead vibration on cabin’s vibro-acoustic characteristics, structural-acousticdesign of bulkhead is done. According to the theory of damping vibration attenuation, the bulkhead is coated with a viscoelasticlayer for reducing the vibration response. As to increase transmission loss, a back annular plate is attached betweenthe bulkhead and the shell according to the principle of impedance mismatch. The vibro-acoustic characteristics of the cabinare calculated by FEM/BEM and the bulkhead’s vibration control effect is analyzed. The results show that bulkhead coatedwith the viscoelastic layer and added with the attached back annular plate can not only reduce cabin’s vibration and sound radiationeffectively, but also isolate the structure-borne sound from the adjacent cabin significantly. So, this is a better measurefor bulkhead’s vibration damping and noise reduction.
出处
《噪声与振动控制》
CSCD
2014年第1期32-35,共4页
Noise and Vibration Control
基金
国防科技预研基金(4011101020101)
关键词
振动与波
舱壁振动
舱段
隔振设计
声辐射
vibration and wave
bulkhead vibration
cabin
vibrating isolation design
sound radiation
