外部加环肋有限长圆柱壳体声散射  

Scattering from an external ring-stiffened finite cylindrical shell

作　　者：郑国垠[1,2] 潘安[1] 范军[1] 汤渭霖[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]武汉第二船舶设计研究所,武汉430064

出　　处：《声学学报》2010年第5期523-529,共7页Acta Acustica

基　　金：国家自然科学基金资助项目(105004021)

摘　　要：为了深入理解双层加肋圆柱壳体的声散射机理,专门研究了两层壳体之间环肋的声散射。仅考虑模型的刚性散射,采用Kirchhoff近似推导了单个环肋的反向散射声场的解析解,并推广到等间距的环肋散射,结合圆柱壳刚性散射得到外部加周期性环肋的圆柱壳体的散射声场近似解。同时,利用图形声学方法(GRACO)对模型的目标强度进行数值计算。理论与实验的结果表明,刚性散射在反向散射声场中起主要作用,周期性环肋引起的Bragg散射对散射声场有重要贡献,同时遮挡效应在实际情况下有较大作用。Acoustic scattering from the rings between two shells insonified by an incident plane wave is specially studied in order to deeply understand the mechanism of the scattering from double cylindrical shells with internal ring-stiffened. Only considering the rigid scattering the analytic solutions of the scattering field of the single ring are derived by applying the Kirchhoff approximation.The method is also used to estimate the scattering from the periodic rings. The approximate solutions of the scattering field of the external ring-stiffened finite cylindrical shell are derived with combination of the rigid scattering from the cylindrical shell and the scattering from the periodic rings.The target strength of the model is also calculated using the GRACO method.The theoretical and experimental results show that the rigid scattering plays a major role in the backscattering field.Bragg scattering caused by the periodic rings has important contribution to the scattering field.It also shows that the shielding effect plays quite a big part in the actual situation.

关 键 词：加肋圆柱壳体 声散射 环肋 Kirchhoff近似 有限长 Bragg散射 散射声场 散射机理 

分 类 号：TB52[理学—物理]