水下爆炸气泡载荷作用下船体梁的动态水弹性响应

摘要

This paper based on the potential flow theory, studied the dynamic hydro-elastic whipping response and the resonance effect of a ship hull girder subjected to underwater explosion bubbles. A theory of inter-action between gas bubbles and a hull girder is presented. A bubble model with the bubble migration, free surface effect and drag force taken into consideration and an elastic hull girder model are established. Two different examples of real ships are given to demonstrate the effect of rigid-body motion on hull girder ’s hydro-elastic responses. Resonance mechanism in the hull girder’s elastic response to underwater bubbles is discussed.%文章基于势流理论，针对水下爆炸气泡脉动载荷作用下船体梁的动态水弹性鞭状响应及其共振效应进行了研究。阐述了水下爆炸气泡与船体梁之间的流固耦合理论分析，并分别建立了一个考虑气泡迁移，自由面效应和气泡阻力的气泡模型和一个船体梁的弹性响应的计算模型。文中以两条实船作为算例，研究了刚体运动对船体梁弹性振动响应的影响，分析了船体梁在气泡脉动载荷作用下产生的共振破坏的机理。