部分敷设阻尼层的有限长环肋圆柱壳声辐射计算方法研究

Sound radiation from submerged finite ring-stiffened cylindrical shells, partially covered with compliant layers

利用模态展开技术和Green函数法研究了部分敷设阻尼层的有限长环肋圆柱壳在流场中的声辐射特性。环肋圆柱壳两端简支,并连有无限长的刚性圆柱障板;阻尼层用无质量的粘弹性弹簧模拟。在环肋圆柱壳的模态运动方程中,外声场、阻尼覆盖层和环肋之间存在复杂的模态耦合效应。文中计算了有限长环肋圆柱壳在水下的辐射声功率和振动均方速度,分析了阻尼层覆盖面积、阻尼层刚度、环肋等对其水下声辐射的影响。

By means of modal expansion technique and Green＇s function method, the sound radiation characteristics of submerged finite ring-stiffened cylindrical shells, partially covered with damping layers, are investigated.The cylindrical shell is simply-supported and terminated by infinite rigid cylindrical baffles at two ends; the damping layer is simulated by a massless viscoelastic spring. In the shell＇s modal equations of motion, the exterior fluid medium, the damping layer and the periodic rings lead to complicated modal coupling. The shell＇s radiated power and radial quadratic velocities are calculated, respectively. The influences of the rings, the damping layer area and stiffness upon the shell＇s sound radiation are discussed.