水下爆炸气泡作用下船体总纵强度估算方法

水下爆炸中的气泡脉动载荷会造成舰船的鞭状运动，对其总纵强度产生很大威胁，是战争中造成船体总体毁伤与丧失生命力的主要原因之一。基于势流理论，推导并建立船体梁气泡弯矩的理论与计算方法，同时综合考虑气泡弯矩、船体静水弯矩、波浪弯矩及砰击弯矩等其他影响因素，建立一套完整的气泡作用下船体梁总纵强度估算方法。通过算例，校核典型工况下多种弯矩同时作用时船体梁的总纵强度。计算结果表明，气泡脉动载荷产生的总纵弯矩具有周期性鞭振特性，且数值大于其他弯矩。在评估舰船总纵强度与生命力时，应充分考虑气泡脉动载荷的影响。

The Evaluation Method of the Longitudinal Strength of a Ship Hull Subjected to the Bubble Load in Underwater Explosion

The bubble load in the case of underwater explosion can cause the whipping motion of ship hulls, which threats the longitudinal strength of the ship hull, one of the main causes for warships＇ global damage. Based on the potential flow theory, a calculation method is deduced and established to study the bubble bending moment of the hull girder. Taking the static water bending moment, wave bending moment, and slamming bending moment into consideration, a complete estimation method of the longitudinal strength of ship hulls subjected to the bubble load in underwater explosion is developed, and the longitudinal strength of ship hulls subjected to multi-bending moment in typical loading cases is studied. The results indicate that the longitudinal bending moment induced by the bubble load has the characteristic of cyclical whipping vibration, and its numerical values are larger than other bending moments. In brief, the bubble pulsation load should be considered in the evaluations of the longitudinal strength and survivability of warships.