考虑到船桥碰撞的随机性，为获得驳船斜撞刚性墙的撞击动力时程概率模型样本，建立了6艘不同吨位的代表性驳船有限元计算模型，利用LS-DYNA有限元软件进行数值模拟计算，获得了6个不同撞击速度下36条船撞动力时程样本曲线。将样本曲线无量纲化，得到了无量纲的船撞动力时程，以及撞击力均值和持续时间的参数表达式。采用21个离散点近似表示无量纲化曲线，统计分析表明各离散断面上的无量纲撞击力符合正态分布，并得到各离散断面无量纲撞击力的均值和标准差。根据随机数生成技术，生成驳船斜撞刚性墙动力时程样本。通过人工随机生成的概率模型样本与数值模拟计算得到的样本进行比较，确定该技术方法的精度较好。
Abstract
With consideration of the random nature of barge-bridge collision, 6 barges with difference tonnage were modeled to get the dynamic time history probabilistic model sample of barge-rigid wall oblique collision. LS-DYNA was used for numerical simulation, and 36 curves of the dynamic time history with 6 velocities were obtained. These curves were non-dimensionalized, and dimensionless curve of dynamic time history were obtained. Furthermore, the expressions of mean impact force and duration with tonnage and velocity were known. 21 discrete points were used to express the dimensionless curves approximately and statistical analysis was conducted at each discrete points. The results show that the dimensionless impact forces of every discrete section are normally distributed, and then the mean value and standard deviation are obtained. According to the random number generation technology, the sample curve of barge-rigid wall oblique collision is generated. Comparison the artificial probabilistic model sample with numerical simulation curve verifies that this technical approach has a better accuracy.
关键词
驳船 /
刚性墙 /
数值分析 /
概率模型 /
船撞动力时程 /
无量纲化 /
LS-DYNA
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Key words
Barge /
rigid wall /
numerical simulation /
probabilistic model /
impact force time history /
non-dimension；LS-DYNA
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