摘要
为研究纵向构件对双层圆柱壳振动与声辐射特性影响的一般规律,首先采用结构有限元耦合流体边界元方法计算出增加纵向构件前后双层圆柱壳轻外壳的振动响应;然后,采用波数谱分析的方法将它们在波数域上进行波形分离,并得出它们法向速度振动功率波数谱和辐射声功率波数谱;最后,通过对两模型不同波数谱的比较分析,总结了纵向构件对结构振动模式的影响以及结构振动模式与辐射声功率间的关系。研究表明:纵向构件对圆柱壳轻外壳周向阶的振动影响不大,它的加强会减小轻外壳轴向长波振动的幅值,但能增加其平均辐射效率。
In order to study the effect of longitudinal member on vibration and sound radiation of double cylindrical shells, three steps are taken. Firstly, coupling vibration responses of two double cylindrical shells which have a longitudinal member are obtained by FEM/BEM. Seconcly, through transforming the radial vibration response of the outside shell in the wavenumber approach, the nomal velocity vibration and radiation power wavenumber spectrums are obtained. Thirdly, those wavenum- ber spectrums of the two structures are compared. It is found that the double cylindrical shells with a reinforced longitudinal member have higher mean radiant efficiency, lower wave amplitude in axial and weak effect in circumference.
出处
《海军工程大学学报》
CAS
北大核心
2015年第6期55-59,共5页
Journal of Naval University of Engineering
基金
国家部委基金资助项目(51179199/E091005)
关键词
波数谱
振动
声辐射
圆柱壳
wavenumber spectrum
vibration
sound radiation
cylindrical shell
