标题:
基于模态分析的海洋钻机井架结构动力修改The Dynamic Modification of Derrick Structure of Offshore Drilling Rig Based on Modal Analysis
作者:
吴寒, 华剑, 王晶
关键字:
海洋钻机, 井架, 模态分析, 灵敏度分析, 结构动力修改Offshore Drilling Rig, Derrick, Modal Analysis, Sensitivity Analysis, Structural Dynamic Modification
期刊名称:
《Journal of Oil and Gas Technology》, Vol.38 No.4, 2016-12-15
摘要:
通过对450T海洋钻机井架的模态分析得知，该井架部分模态频率与转盘工作频率符合。为避免结构共振，基于灵敏度分析和结构动力修改的基本原理，分析了井架模态频率对部分杆件截面参数的灵敏度，在此基础上通过修改杆件截面参数完成了井架结构动力修改。结果表明，修改后井架的模态频率发生了改变，其中第3阶模态频率由3.43 Hz上升到3.59 Hz，第4阶模态频率由4.34 Hz上升到4.49 Hz，将有效改善井架的结构动态特性。
The modal analysis for derrick structure of 450T offshore drilling rig showed that some modal frequencies of the derrick were coincident with the working frequencies of the rotary table. To avoid structure resonance of the derrick, based on sensitivity analysis and the fundamental theory of structural dynamic modification, the modal frequency sensitivity of the derrick to the sectional parameters of structural components was analyzed; then through modifying the sectional para-meter of structural components, the structural dynamic modification of the derrick is carried out. Result shows that the modal frequencies of the modified derrick are changed; and the 3rd order modal frequency is raised from 3.43 Hz to 3.59 Hz; the 4th order modal frequency is raised from 4.34 Hz to 4.49 Hz; thus the dynamic characteristics of the derrick are effectively improved.