基于灵敏度分析的深井钻机底座结构动力修改  

Sensitivity-based Analysis of Structural Dynamic Modification of Deep-well Rig Substructure

作　　者：李建平 徐军 周思柱[2] 华剑[2] 

机构地区：[1]中石化石油工程机械有限公司第四机械厂 [2]长江大学机械工程学院

出　　处：《石油机械》2013年第7期22-24,共3页China Petroleum Machinery

基　　金：湖北省重大科技专项"深井数字化电控钻机研制及产业化"(2011AAa001);湖北省自然科学基金项目"超深井石油钻机井架的振动机理及检测方法研究"(2012FFC00201)

摘　　要：针对ZJ70LDB钻机平台工作中出现X方向振动较大的问题,采用动态信号采集及分析系统对底座进行了现场模态测试,得出各阶振型及模态频率。分析得到减速箱输入轴和输出轴的工作频率激起了底座的第3阶模态。为减小振动,对底座各节点进行质量对固有频率的灵敏度分析,选择14、31及22这3个节点实施结构动力修改。修改结果表明钻机底座第3阶模态频率降低13.42%,有效避开了设备的共振频率。There is a remarkable vibration with the ZJ70LDB drilling rig platform along the X direetion in the process of its operation. Considering this problem, the dynamic signal collection and analysis system was adopted to make a field test of the substrueture modality to obtain the vibration type and modal frequeney of the orders. The analysis indicates that the working frequency of the input and output shafts of the reduction gearbox excites the third- order modality of the substructure. To reduce vibration, a sensitivity analysis of the mass-natural frequency of the substructure nodes was conducted. The nodes of 14, 31 and 22 were seleeted to carry out the structural dynamic modification. The modification shows that the third-order modal frequeney of the rig substrueture deereases by 13.42%, effectively avoiding the resonance frequency of equipment.

关 键 词：深井钻机 底座 模态测试 固有频率 灵敏度 结构动力修改 

分 类 号：TE923[石油与天然气工程—石油机械设备]