地震载荷工况下LNG卸料臂整机结构有限元分析与应用实践  

Finite Element Analysis and Application of Complete LNG Unloading Arm Under Earthquake Loads Conditions

作　　者：郝思佳 肖立[1] 邱灶杨 杨亮 甄聪 陈团海[1] HAO Sijia;XIAO Li;QIU Zaoyang;YANG Liang;ZHEN Cong;CHEN Tuanhai(CNOOC Gas&Power Group Co.,Ltd.,Beijing 100028,China)

机构地区：[1]中海石油气电集团有限责任公司,北京100028

出　　处：《装备环境工程》2025年第3期136-145,共10页Equipment Environmental Engineering

基　　金：中国海洋石油集团有限公司海油众创项目(HYZC-2022-01-020-QD)。

摘　　要：目的基于大口径卸料臂在备用工况的受力情况,针对其整机结构进行有限元计算分析和设计优化。方法在建立有限元模型时,较大程度还原卸料臂的实际运动状态。通过模态分析得到卸料臂结构的振型和固有频率,为卸料臂的振动特性分析以及地震载荷计算提供依据。分别对OBE和SSE地震载荷组合作用下的最恶劣工况的卸料臂整机结构进行有限元计算和分析,得到卸料臂在承受载荷时的应力和变形情况,完成结构强度校核。结果建立的有限元模型精度较高,根据有限元计算分析结果,提出采用柔性滑环替代刚性隔衬优化方案,可降低管道系统及旋转接头的载荷。指导部分结构的材料优化选型以及结构安全系数强化设计,并提出加厚钢管壁厚的方案,提升卸料臂整体结构的安全可靠性。结论该结构形式的卸料臂可满足在地震载荷极限状态的设计要求,相关研究结果可为自主技术卸料臂设计与工程化应用实践提供技术支撑。The work aims to carry out a finite element analysis and design optimization for the complete structure of the loading arm based on the stress situation of the large-diameter unloading arm under standby conditions.When establishing a finite element model,the actual motion state of the unloading arm was greatly restored.The vibration mode and natural frequency of the unloading arm structure were obtained through a modal analysis,to provide a basis for analyzing the vibration characteristics of the unloading arm and calculating earthquake loads.In addition,a finite element calculation and analysis was performed on the complete structure of the unloading arm under the worst-case conditions of OBE and SSE earthquake load combinations,to obtain the stress and deformation of the unloading arm under load,and finish the structural strength verification.The established finite element model had high accuracy.According to the results of the finite element calculation and analysis,a flexible slip ring was proposed to replace the rigid lining for optimization,reducing the load on the pipeline system and rotating joints;The material optimization selection and structural safety factor enhancement design of some structures were completed under guidance,and a plan was proposed to increase the wall thickness of steel pipes to improve the overall safety and reliability of the unloading arm structure.The unloading arm of this structural form can meet the design requirements under the earthquake load limit state,and the relevant research results can provide a technical support for the design and engineering application of independent technology unloading arms.

关 键 词：液化天然气 卸料臂 地震载荷 有限元分析 结构优化 

分 类 号：U462[机械工程—车辆工程]