摘要
建立了9艘代表性轮船的精细有限元计算模型,通过与刚性墙面的碰撞模拟计算,获得了不同吨位和不同撞击速度下共81条船撞力时间过程样本。为考虑船舶撞击力时间过程的随机性,对撞击力的持续时间和撞击力幅值进行了无量纲化处理,得到了无量纲撞击力时间过程。将无量纲时间在21个断面上进行了离散化,通过统计检验,确定各断面上的无量纲撞击力符合正态分布,并给出了各断面的均值与标准差,进而得到了撞击力时间过程的概率统计模型。根据所建立的撞击力概率统计模型,引用随机数的生成技术,给出了生成船撞力时间过程的人工方法,并将人工生成的船撞力时间过程样本与碰撞数值模拟结果进行了比较,验证了本文方法的统计合理性和实用性。
The fine finite-element models of 9 typical ships are developed. Through numerical simulations of the ship-rigid wall collision, 81 samples of the impact force time history associated with different tonnages and velocities are obtained. For the purpose of considering the randomness existing in the impact force time history, the time and the force amplitude non-dimensionalization are made, and those dimensionless time histories are acquired. After that, the dimensionless time is discretized at 21 sections. Through statistical analysis and hypothesis tests, it turns out that the dimensionless impact force at each section follows normal distribution, which provides the mean and standard deviation correspondingly. Then, the probabilistic model of the impact force time history is obtained. According to this model, the artificial method for generating impact force time history is developed with reference of the technique of generating random numbers. Comparison of the results of the artificial samples with the numerical simulation for the impact force time history verifies that the statistical method in this paper is reasonable and utility.
出处
《公路交通科技》
CAS
CSCD
北大核心
2014年第1期82-88,共7页
Journal of Highway and Transportation Research and Development
基金
国家重点基础研究发展计划(九七三计划)项目(2013CB036305)
交通部西部交通建设科技项目(200731882234)
国家自然科学基金项目(51278373)
交通部交通行业联合科技攻关项目(2008353344340)
关键词
桥梁工程
桥墩
数值模拟
概率统计模型
船-桥碰撞
人工撞击力时程
bridge engineering
pier
numerical simulation
probabilistic model
vessel-bridge collision
artificial impact force time history
