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为考虑船桥碰撞过程中荷载的随机性,进行了轮船撞击刚性墙的模拟计算。考虑到船舶结构的多样性,建立了9艘不同吨位和尺寸轮船的有限元模型,并以9种不同的速度撞击刚性墙,得到了81条船撞击力-撞深过程样本曲线。将样本曲线量纲一化,并采用21个离散点近似表示每条量纲一化曲线,在各离散点处对量纲一化撞击力进行了统计分析。通过对概率密度函数进行限界修正,建立了撞击力-撞深过程的概率统计模型,最后在统计意义上对概率模型的参数取值进行了讨论。研究结果表明:在各撞深处的量纲一化撞击力近似服从正态分布;限界修正方法消除了随机变量在数学意义与物理意义上的矛盾,提高了模型的适用性;所建立的概率模型在统计意义上与数值模拟获得的样本吻合良好。
In order to consider the randomness of the load during the bridge collision, the simulation calculation of the ship crashing rigid wall was carried out. Taking into account the diversity of ship structures, nine finite element models of ships with different tonnage and size were established and hit with rigid walls at nine different velocities to obtain 81 sample curves of impact-impact process of ships. The sample curves were normalized and 21 discrete points were used to approximate each dimension normalized curve. Statistical analysis of the impact force at each discrete point was carried out. By modifying the probability density function, the probability statistical model of the impact-impact process is established. Finally, the parameter values of the probability model are discussed statistically. The results show that the impact force of one-dimensional impact at each collision depth approximately obeys the normal distribution. The boundary correction method eliminates the contradiction between the mathematical meaning and the physical meaning of random variables and improves the applicability of the model. The established probability The model is in good agreement with the sample obtained from numerical simulation.