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基于相似模型试验的导管架平台有限元模型修正
林红1,2,李萍2,杨蕾3,齐宝2,陈新雅2,陈国明1
(1.中国石油大学(华东)海洋油气装备与安全技术研究中心, 山东青岛 266580;2.中国石油大学(华东)储运与建筑工程学院, 山东青岛 266580;3.中国石油大学(华东)理学院,山东青岛 266580)
摘要:
根据设计尺寸建立的有限元模型与实际结构之间不可避免地存在一定偏差,须根据试验测量数据对有限元模型进行必要的修正。基于相似原理设计制作完整平台和损伤平台的缩尺模型,开展模态试验;根据模态置信准则(MAC)评价试验模态数据和有限元计算数据的相关性。应用灵敏度分析方法对结构设计变量进行分级,以有效识别出平台结构中的待修正参数。针对含有未知损伤的海洋平台,采用结构参数的优化方法,识别损伤位置并实现损伤平台有限元模型的更新。结果表明:对于完整平台,修正后前六阶固有频率的误差均值由修正前的17.22%降至2.78%,修正后的有限元模型更接近试验结构;平台损伤后MAC显著降低,根据优化方法可准确定位出2个缺失构件的位置,且修正后固有频率的误差均值由25.94%降至4.79%。通过修正可为在役海洋平台安全评估提供一个准确的有限元模型。
关键词:  导管架海洋平台  相似模型  模态试验  灵敏度分析  有限元模型修正
DOI:10.3969/j.issn.1673-5005.2019.02.014
分类号::TE 951
文献标识码:A
基金项目:国家自然科学基金项目(51879272,6);中央高校基本科研业务费专项(18CX02074A)
Finite element model updating of offshore jacket platforms based on similar model experiment
LIN Hong1,2, LI Ping2, YANG Lei3, QI Bao2, CHEN Xinya2, CHEN Guoming1
(1.Center for Offshore Engineering and Safety Technology in China University of Petroleum(East China), Qingdao 266580, China;2.College of Pipeline and Civil Engineering in China University of Petroleum(East China), Qingdao 266580, China;3.College of Science in China University of Petroleum(East China), Qingdao 266580, China)
Abstract:
Since differences between the prototype structure and the corresponding numerical model are inevitable, it is necessary to update the finite element model (FEM) according to the experimental data. Based on the similarity theory, scaled models of intact jacket platform and damaged jacket platform were designed and the modal experiments were carried out. According to the modal confidence assurance criterion (MAC), the correlation between the modal data obtained by the experimental and finite element analysis (FEA) was assessed. The sensitivity analysis was used to classify the structural design variables so as to effectively identify the key parameters to be modified. For the platform with unknown damages, the optimization method on structural parameters was adopted for damage location identification and the FEM updating. The objective function of this method is based on the measured and analytical modal data. The analysis results show that for the intact platform, after FEM updating the average error of the first six natural frequencies between experiments and FEA reduced from 17.22% to 2.78%, which shows that the updated FEM is much closer to the experimental model. For the damaged platform, the MAC decreases significantly; the two damaged members of the platform are accurately located according to the optimization method; and after updating the average error of the frequencies decreases from 25.94% to 4.79%. This project provides a more accurate FEM model for the safety assessment of in-service offshore platforms.
Key words:  offshore jacket platform  similar model  modal experiment  sensitivity analysis  finite element model updating
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