水下爆炸气泡脉动作用下细长加筋圆柱壳的鞭状响应分析

细长加筋圆柱壳是潜艇耐压壳体的主要结构,其在水下爆炸载荷之下发生的鞭状运动是潜艇结构破坏的主要因素之一.为了考察不同的因素对于细长加筋圆柱壳鞭状响应的影响,该文将圆柱壳简化为一根变截面的梁,用双重渐进近似法(DAA)描述了结构的动态变形与瞬态流场的耦合作用,从弯矩的角度的考察了水下爆炸第一次气泡脉动载荷对结构鞭状响应的贡献,总结了圆柱壳上的弯矩随潜深,爆距,爆炸方位角变化的规律.研究结果有助于进一步了解水下爆炸作用下潜艇的鞭状动响应特征,并用以改进潜艇的抗冲击设计.

Whipping response analysis of slender stiffened cylindrical shell subjected to underwater explosion with bubble pulse

The underwater explosion induced whipping responses of the slender cylindrical shell of a submarine is one of the major factors of the structural damage,which may eventually result in loss of the ship's life.In order to investigate the influence of different relative configurations of the explosion on the whipping responses,the cylindrical shell is simplified as a beam with un-uniform cross sections in this paper,and the Double Asymptotic Approximation method(DAA) is employed to describe the coupling effect of the dynamic motions of the structure and the transient fluid field.The contributions of the first bubble pulse produced by the underwater explosion to the whipping responses of the structure are examined in terms of the dynamic bending moment of the beam.The variations of the bending moment with respect to the different dive depth,different distance and attack angle of the explosive relative to the submarine target are investigated.The results thus obtained may help to understand the underwater explosion induced dynamic behavior of a submarine,and to improve the shock-resistant design of the ship structure.