石油钻井塔架结构的动特性灵敏度分析

Analysis of dynamic characteristic and sensitivity of drilling rig derricks

用摄动有限元及二阶摄动分析方法，对石油钻井塔架大腿局部存在缺陷及局部刚度加强等状态下的动特性及灵敏度进行了分析计算，并与有限元重分析的动特性计算结果作了比较，得出了前者比后者省时省力的结论。这种方法对今后设计新型塔架有很好的参考价值，也为其他工程实际结构的动力修改和优化设计提供了一种简单可靠的计算方法。

By using the perturbation finite element and second-culer perturbation analysis method,the dynamiccharacteristic and sensitivity of the drilling rig derrick with local defect and local reinforcement on its legsare analyzed and calculated.This method saves a lot of lanbour and time as compared with the calculationby the finite element method.