摘要
为提高潜艇舱段结构针对低频线谱频率的机械阻抗,基于结构增抗技术,通过在环肋处增加质量块形成阻抗增强构件,运用FEM/BEM法对结构修改前后环肋圆柱壳的声振特性进行了数值计算;讨论了附加质量块的大小和位置对结构修改后的辐射声功率的影响;分析了结构修改前后的模态辐射效率.研究表明:在靠近激励源的环肋上附加合适的质量块,能有效降低结构主导模态的辐射声功率;附加质量块的大小和位置对结构修正后的辐射声功率和模态辐射效率有重要影响.
In order to raise mechanical itnpedance of the submarine cabin for line spectrum in low-fre- quency band, the vibro-acoustic characteristics of the ring-stiffened cylindrical shell was studied by modal tailoring. The impedance reinforced structure can be obtained by adding point mass on stiffener based on structure reactance improvement, using the method of FEM/BEM （finite element method/ boundary element method）. The size and position of the added point mass was discussed in influencing the radiation sound power and modal radiation efficiency was analyzed. The results show that adding appropriated point mass on stiffener near the excitated source can depress the radiation sound power of the main mode. The size and position of the added point mass have a significant influence on the radiation sound power and modal radiation efficiency of the tailoring-modal, which provides a way for optimizing structural-acoustic characteristic of the cabin.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第1期90-94,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国防科技预研基金资助项目
关键词
潜艇舱
结构增抗
圆柱壳
振动
声辐射
submarine cabin
structure reactance improving
cylindrical shell
vibration
acoustic radiation
