径向激励作用下有限长双层圆柱壳声振传递特性研究

摘要

The Donnell equation of thin shell was applied to describe double cylindrical shells motion. The effect of the rings, annular pales and the fluid was treated as forces and moments on shells, which were pre-sented in terms of the additional impedance. By using the mode expanding expression of shell ’s displace-ment, the sound and vibration transfer matrix between the inner and outer shell was constituted. The numer-ical analysis of mean square velocity of the outer shell was carried out. The result verified that the transfer matrix of the inner and outer shell was fixed, which was not influenced by excitation property. It offers the theoretical basis to predict the noise of double cylindrical shells.%文章利用Donnel壳体方程描述双层圆柱壳振动，以附加阻抗的形式表示环肋、实肋板以及水介质等对壳体的力作用，结合内外壳振动位移模态展开形式，建立了双层圆柱壳内外壳之间的声振传递矩阵。同时开展了双层圆柱壳外壳均方速度响应仿真分析，验证了双层圆柱壳内外壳振动响应之间存在固定的传递关系，不受激励源特性影响，为双层圆柱壳辐射噪声预估提供了一定的理论指导。