摘要
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。
Considering the random nature of a barge-bridge collision,6 barges with different tons were modeled to get the dynamic time history probabilistic model samples of a barge-rigid wall oblique collision.FE software LS-DYNA was used for numerical simulation,and 36 sample curves of the dynamic time history with 6 velocities were obtained.These sample curves were non-dimensionalized,and dimensionless curves of dynamic time history were obtained.Furthermore, the expressions of mean impact force and duration versus tonnage and velocity were derived.21 discrete points were used to express the dimensionless curves approximately and statistical analysis was conducted at each discrete point.The results showed that the dimensionless impact forces of each discrete section are normally distributed,and then their mean values and standard deviations are obtained;according to the random number generation technique,the sample curves of a barge-rigid wall oblique collision are generated.Comparing the artificial probabilistic model samples with numerical simulation ones,it was verified that this technical approach has a better accuracy.
出处
《振动与冲击》
EI
CSCD
北大核心
2016年第15期23-28,57,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(51278373)
国家自然科学基金会重点(5143801)
国家重点基础研究发展计划(2013CB036305)
交通部西部科技(200731882234)
交通运输部行业联合科技攻关(2008353344340)
