导管架下水参数的正交优化设计

Orthogonal Optimum Design of Parameters of Large-size Jacket Launching

为了更加快速准确地优选下水参数,提高导管架下水方案的设计效率和质量,建立了导管架下水的参数化有限元仿真模型,采用正交试验方法,选取4个主要下水参数,设计了4因素5水平的正交方案,通过参数化批处理方式对所得25种组合工况进行了三维时域数值模拟。选取导管架泥面间隙、驳船摇臂最大支反力和导管架最大拍击速度等3个下水指标,进行参数敏感性极差分析与多指标综合评价。分析结果表明:下水参数对导管架滑移下水工程的安全性和经济性起着主要的控制作用。采用正交试验设计法可以直观地分析下水参数对下水指标的影响状况,分清各因素的影响主次。滑动摩擦因数对导管架拍击速度的影响最大,采用较大的滑动摩擦因数可有效增加下水过程的稳定性和可靠性。由正交试验法得出的优化方案比简单优化法得出的方案更加可靠和经济。所得结论可为导管架滑移下水方案的优化设计提供参考。

In order to optimize the launching parameters more quickly and accurately, and to improve the de-sign efficiency and quality of jacket launching schemes, a parametric finite element simulation model for jacket launching was established. Four main launching parameters were selected, 4-factor and 5-level orthogonal experi-ment schemes has been designed using orthogonal experiment. A three-dimensional time-domain numerical simula-tion was carried out on the 25 combined working conditions using parameterized batch processing. Three launching indexes, the mud surface clearance of the jacket, the maximum bearing reaction force of the barge rocker and the maximum slamming speed of jacket, were selected to conduct the analysis of the range of parameter sensitivity and the comprehensive evaluation of multi- indexes. The analysis results show that the launching parameters play a major role in controlling the safety and economy of the jacket slip-launching project. Orthogonal experimental design method can be used to intuitively analyze the impact of launching parameters on the launching index and to distin-guish the factors influence. The coefficient of sliding friction has the greatest influence on the slamming speed of the jacket. The larger sliding friction coefficient can effectively increase the stability and reliability of the launching process. The optimal solution obtained by the orthogonal experiment method is more reliable and economical than the one obtained by the simple optimization method. The conclusion can provide references for the optimal design of jacket slip launching scheme.