海洋平台的改进模态应变能损伤诊断方法

doi:10.16265/j.cnki.issn1003-3033.2018.12.003

中国安全科学学报 ›› 2018, Vol. 28 ›› Issue (12): 14-19.doi: 10.16265/j.cnki.issn1003-3033.2018.12.003

海洋平台的改进模态应变能损伤诊断方法

冷建成¹ 教授, 田洪旭¹, 徐爽², 周国强¹ 研究员

1 东北石油大学机械科学与工程学院,大庆 163318
2 中国石油集团工程技术研究院,天津 300451

收稿日期:2018-08-15 修回日期:2018-10-12 发布日期:2020-11-25
作者简介:冷建成 (1977—),男,河南信阳人,博士,教授,主要从事现代无损检测、结构健康监测与损伤诊断研究。E-mail:lbyljc@163.com。
基金资助:
国家自然科学基金资助(11472076);黑龙江省博士后科研启动基金资助(LBH-Q16035);中国石油天然气集团公司科学研究与技术开发项目(2016A-1007)。

Improved damage diagnosis method for offshore platforms based on modal strain energy

LENG Jiancheng¹, TIAN Hongxu¹, XU Shuang², ZHOU Guoqiang¹

1 School of Mechanical Science & Engineering, Northeast Petroleum University, Daqing Heilongjiang 163318, China
2 CNPC Research Institute of Engineering Technology, Tianjin 300451, China

Received:2018-08-15 Revised:2018-10-12 Published:2020-11-25

摘要/Abstract

摘要： 为有效提高海洋平台的损伤诊断效果,准确确定损伤位置和损伤程度,针对传统模态应变能(MSE)分析处理过程中易出现的多判、误判等问题,提出基于MSE的改进损伤诊断方法。首先计算实际工况下基于MSE的诊断指标;然后将其分解为多个单损伤工况指标,提取并计算各单损伤工况指标占实际工况指标的权重系数;最后利用权重系数在不同阶模态中的分布差异修正诊断指标,并据此进行损伤诊断。以室内导管架试验平台为例,通过有限元仿真试验进行验证。结果表明:基于改进方法的分析结果与预设的平台结构多损伤工况相符,证明该方法用于海洋平台损伤诊断是有效可行的。

关键词: 海洋平台, 损伤诊断, 模态应变能(MSE), 改进诊断指标, 损伤程度

Abstract: In order to improve the effect of damage diagnosis for offshore platforms, and accurately determine both location and degree of damages, an improved diagnosis method based on modal strain energy was worked out, with which the mistakes of multi-judgement and mis-judgement happening in the traditional analysis and processing of modal strain energy can be avoided. Firstly, the modal strain energy based indexes under actual condition were calculated for the elements. Then the indexes were decomposed into several single damage condition indexes, and the weight coefficients of each single damage condition index to actual condition index were extracted and calculated. Finally, the diagnosis indexes were corrected according to the distribution difference of weight coefficient in different modes, and used to diagnose the damage. Finite element simulation tests of an indoor jacket offshore platform model were performed to verify the improved method. The results show that the damage diagnosis reached by using the method is consistent with the multi-damage conditions of the platform structure, which proves the method is effective and feasible for offshore platform damage diagnosis.

Key words: offshore platform, damage identification, modal strain energy(MSE), improved diagnostic index, damage degree

中图分类号:

X937

冷建成, 田洪旭, 徐爽, 周国强. 海洋平台的改进模态应变能损伤诊断方法[J]. 中国安全科学学报, 2018, 28(12): 14-19.

LENG Jiancheng, TIAN Hongxu, XU Shuang, ZHOU Guoqiang. Improved damage diagnosis method for offshore platforms based on modal strain energy[J]. China Safety Science Journal, 2018, 28(12): 14-19.

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海洋平台的改进模态应变能损伤诊断方法

Improved damage diagnosis method for offshore platforms based on modal strain energy

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