环肋、舱壁和纵骨加强的无限长圆柱壳在水下的声辐射特性

Sound radiation from fluid-loaded infinite cylindrical shells with rings,bulkheads and longitudinal stiffeners

本文建立了有环肋、舱壁和纵骨的无限长圆柱壳在水下声辐射的一般的计算模型,利用Fourier变换和模态展开法导出了圆柱壳振动响应和辐射声压在波数域的计算公式,并由稳相法得到了远场辐射声压的解析公式,分析了纵骨、舱壁和阻尼等因素对声辐射的影响,为准确计算双层圆柱壳在水下的振动和声辐射特性奠定了基础。

The general computational model of sound radiation from fluid-loaded infinite cylindrical shells with rings, bulkheads and longitudinal stiffeners is set up. By means of Fourier transformation and modal expansion the shell's vibration response and acoustic radiation are formulated, and by using stationary phase method the far-field sound pressure is derived. The influences of number of modal truncation, longitudinal stiffeners, bulkheads as well as damping on the shell's acoustic radiation are analyzed. All these lay down the basis for accurate analysis of the sound radiation from fluid-loaded reinforced double cylindrical shells.