基于模型重构的在役海洋钻机底座结构性能分析

Structure Properties Analysis of Offshore Rig Substructure Based on Model Reconstruction

为确保海上钻采安全高效生产,结合工程经验和测试数据,将有限元模型修正问题转化为最优化参数估计问题,提出了基于优化的底座模型重构方法,用于在役海洋钻机底座承载能力计量和结构安全评价。以加载试验结果修正数值模型,高阶载荷的修正值与实测值误差不超过6%;将修正后的结构参数作为参考值来模拟底座的静、动态力学性能,预测到底座的薄弱井位、结构的薄弱部位以及安全承载能力。

To ensure the safe operation of offshore drilling work,the modal reconstruction method based on optimization theory is proposed,which is used for the bearing capacity estimation and structural safety evaluation of offshore rig substructure in service.Combining with engineering experience and test data,the problem on the finite element model updating is transformed into optimization parameter estimation.The numerical model is updated by the test results,its error is less than 6%under high load.The updated structural parameters are used as reference values to simulate the static and dynamic mechanical properties.Then the failure shape,dangerous position and its safe bearing capacity can be forecast more accurately.