关键词: 钻机, 井架, 承载力预测, 有限元模型, 模态参数, 修正函数, 仿真模型

Abstract: In order to improve the precision of simulation and reduce the discrepancy between the theoretical calculation and testing result,the model for analysis of the in-service rig derrick was established on the basis of the finite dynamic model using optimization method.Based on a simple and applicable method for sensitivity analysis,the updating parameters were determined such as material,cross shape and size of the main loading rods in the rig derrick.The optimal updating function was established according to the residual differential value between testing modal parameter and theoretical modal parameter.The first-order optimization algorithm was used to optimize and assess the updating parameters.The simulation analysis on an in-service rig derrick was carried out using the linear buckling,geometric nonlinear and double nonlinear methods.The result proves that the calculation of modified model based finite element model is close to the test result.This method is favorable for the forecast of bearing capacity and safety evaluation of rig derrick in the practical engineering.

Key words: rig, derrick, force-bearing capacity prediction, finite element model, modal parameters, updating function, simulation model