有限长圆柱壳结构声学设计模型  

Structure-acoustics design model for finite cylindrical shell

作　　者：艾海峰[1] 陈志坚[1] 高翔[2] 

机构地区：[1]海军工程大学船舶与动力学院 [2]92951部队

出　　处：《海军工程大学学报》2011年第2期47-51,共5页Journal of Naval University of Engineering

基　　金：国家部委基金资助项目(401110102010)

摘　　要：为进一步明确有限长圆柱壳结构的声学设计模型,推导了具有任意边界条件的任意封闭结构在模态坐标下的流固耦合声辐射有限元/边界元求解方法,利用该方法分析了采用刚性圆板封闭的两端简支有限长圆柱壳在考虑流固耦合影响时的振动和声辐射规律,并与不考虑流固耦合影响、采用单位长度附加质量近似处理流固耦合、考虑流固耦合影响并且用半无限长圆柱形刚性障板代替两端刚性圆板时的计算结果进行了比较,指出除在少数耦合模态的固有频率附近,在低于环频率的频率范围内,两端简支在半无限长圆柱形刚性障板上的有限长圆柱壳与采用刚性圆板封闭的两端简支有限长圆柱壳,具有十分相近的声辐射规律。To determine the structure-acoustics design model for finite circular cylindrical shell further, and deal with the considering the influence of fluid-structure coupling, a FEM/BEM method based on modal coordinates was deduced to solve the sound radiation problems of the arbitrary closed structure with arbitrary boundary conditions. Then the method was used to calculate the sound radia- tion of a simple supporting finite circular cylindrical shell at the end of the rigid circular plates. The result was compared with that of neglecting the effect of fluid, that of treating the influence of fluid- structure coupling as the added mass of unit length, and that of substituting two semi-infinite rigid cylindrical baffles for the rigid circular plates. The comparison indicates that except the frequencies near the natural frequencies of a few coupled modes, the sound radiation of the simple supporting fi- nite cylindrical shell at the ends of the rigid circular plates is similar to that of the two semi-infinite rigid cylindrical baffles in the frequency band lower than the ring frequency.

关 键 词：圆柱壳 模态坐标 有限元/边界元 结构声学设计 

分 类 号：U661.44[交通运输工程—船舶及航道工程] O426.1[交通运输工程—船舶与海洋工程]