【摘要】 采用空间简谐分析方法对水下无限长周期环肋圆柱壳受周向余弦分布简谐力振动的辐射声功率进行了解析计算.分别采用Flügge方程和Helmholtz方程建立壳体及声场的波运动方程,考虑肋骨的四种作用力和力矩,探讨了环肋及环肋参数对壳体表面辐射声功率级的影响,发现肋骨在较低和较高频段对声辐射有较好抑制作用,在环频率附近影响不明显.分析结果适用于整个频段,可为此类结构的工程设计提供参考.更多还原

【Abstract】 Using periodic theory of space-harmonic analysis,the characteristics of radiated sound power from a cosine harmonic line force into an infinite cylindrical shell periodically stiffened with rings immersed in water are studied analytically.The harmonic motion of the shell and the pressure field in the fluid are described by Flügge shell equations and Helmholtz equation respectively,and four kinds of rings′ forces and moments are considered.The influence of circumferential order number and the parameters of the stiffeners upon the results are discussed.A conclusion is drawn that the stiffeners will greatly control sound radiation at low and high frequencies while have little influence around ring frequency.The analysis can be applied to the whole frequencies and the results will provide some references for the designers.更多还原