水下爆炸作用下船体梁整体运动简化理论模型

Simplified theoretical model for bulk movement of hull girder subjected to underwater explosion

针对水下爆炸作用下舰船整体运动响应的理论预报问题,将船体结构简化为等截面直梁,以炸药在船体梁中部正下方爆炸工况为研究对象,将爆炸载荷压力曲线划分为五个典型阶段.结合平板边界条件下的冲击波和气泡载荷压力分布函数,建立了冲击波和气泡联合作用下船体梁整体运动响应的简化理论计算模型,并利用船体梁模型试验对该方法进行了验证.结果表明:所建立的水下爆炸作用下船体梁整体运动响应理论模型具有一定的合理性,能够反映船体梁整体运动过程及响应幅值.

In order to predict the dynamic response of a warship＇s hull subjected to underwater explosion, a simplified theoretical model of the whole movement of the hull was investigated and presented. In the model, the hull was simplified as an uniform beam and TNT charge was located under the midspan of the beam. The pressure curve of explosion load was divided into five stages in which the pressure distribution functions were deduced from the wall-pressure characteristics of shock waves and bubble oscillations. Finally, a ship-like beam was used in the experiment to verify the method, and the characteristics of the beam＇s motion were analyzed by means of the theoretical model. Results show that the experimental data basically agrees with that of theoretical analysis. The theoretical method can reasonably forecast the moving process and the response amplitude of the hull girder.