基于PTTM方法的水下爆炸冲击动弯矩计算方法及实尺度试验研究

Calculation method for the shock dynamic moment on a ship subjected to underwater explosion load based on the PTTM method and real-scale ship tests

对实船水下爆炸冲击动弯矩计算方法进行研究,将船体等效为变截面梁,基于离散时间传递矩阵法,结合非齐次项的精细积分方法,构造求解船体梁模型在水下爆炸载荷作用下的动弯矩响应的精细传递矩阵,结合边界条件分别求出船体梁在水下爆炸载荷作用下的冲击动弯矩,实现离散时间精细传递矩阵法对实船水下爆炸试验冲击动弯矩的计算。同时开展实尺度船舶水下爆炸冲击动弯矩试验,将计算结果与实船水下爆炸试验进行对比,对该研究提出的方法进行了验证。

A calculation method for the shock dynamic bending moment on a ship subjected to underwater explosion was studied.Based on the discrete time transfer matrix method combined with the non-homogeneous precise integration method,the hull beam was equivalent to a variable cross-section beam,and the precise time transfer matrix(PTTM)of shock dynamic bending moment of the ship beam model subjected to underwater explosion was constructed.In consideration of the boundary conditions,the shock dynamic bending moment was calculated.Meanwhile,shock dynamic bending moment tests of a real-scale ship subjected to underwater explosion were conducted.The calculation results were compared with the full-scale warship underwater explosion test values,and the proposed method was verified.