双周期环加强的无限长多层复合圆柱壳体的径向位移螺旋波谱

由均匀各向同性或复合材料制成的圆柱壳体内沿周向和轴向传播的弯曲波会合成螺旋波,在壳体的声辐射问题中扮演重要角色.文章是对作者在以往关于多层复合壳体声辐射研究的扩展5].通过数值结果,分析了因周期加强环存在在螺旋波谱云图上的周期分布的亮点,该周期分布亮点归因于Mace和Burroughs所揭示的波数转换效应;同时讨论了因复合材料铺设角变化而引起的螺旋波谱形状在云图中的转动.

Helical Wave Spectra of the Radial Displacement of an Infinite Laminated Composite Cylindrical Shell Reinforced by Doubly Periodic Rings

For flexural waves traveling in circumferential and axial directions of cylindrical shells, which are constructed by uniformly isotropic or composite materials, they have a resultant effect, namely, in-ducing helical waves, which are known in playing an important role at the acoustic radiation from the cylindrical shells. This paper is an extension of authors' previous investigation on the acoustic radia-tion from laminated composite shells. The periodically spaced bright points due to the presence of the periodic reinforcing rings in the contour plot of the helical wave spectra are analyzed by utilizing numerical results. And the rotation of the configuration of the helical wave spectra in the contour plot, due to the change of the ply angles of composite materials, are also addressed.