考虑温度梯度的模态应变能法海洋平台损伤检测研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (6) : 90-95.

论文

考虑温度梯度的模态应变能法海洋平台损伤检测研究

刘克飞1，石湘1，周雷2，王凤云2

作者信息 +

Research of damage detection to offshore platforms based on modal strain energy method considering the temperature gradient

Liu Ke-fei1, Shi Xiang1, Zhou Lei2, Wang Feng-yun2

Author information +

文章历史 +

摘要

针对导管架式海洋平台，研究了海水温度梯度对结构整体损伤检测方法之一的模态应变能法的影响。以一个导管架平台为模型，考虑温度对钢材弹性模量的影响，建立了该平台在模拟的海水温度梯度下的有限元模型。通过使用模态应变能法对该模型进行损伤检测，总结了温度梯度对基于模态应变能法的海洋平台损伤检测的影响规律。结果表明温度梯度会使该方法损伤定位能力变弱，对结构冗余度越大的构件影响越大；同时会使损伤程度识别精度降低，构件结构冗余度越大、损伤程度越小，影响越大。

Abstract

For offshore jacket platforms, the influences of seawater temperature gradient on modal strain energy method, which is one of the methods for structural global damage detection, were studied. Taking a Jacket-type offshore platform as a model, the finite element model under the simulated seawater temperature gradient was built regarding the influences of temperature on steel elastic modulus. By detecting and analyzing the damage simulated on this model using mode strain energy method, the influence rules of temperature gradient on damage detection to offshore platform based on modal strain energy method were summarized. It is demonstrated that the temperature gradient weakens the ability of damage location using the method, especially for the members with greater structure redundancy, and it also reduces the precision of damage extent detection, the reduction will be greater for the members with greater structure redundancy and lower damage extent.

导出引用

刘克飞;石湘;周雷;王凤云. 考虑温度梯度的模态应变能法海洋平台损伤检测研究[J]. 振动与冲击, 2012, 31(6): 90-95

Liu Ke-fei;Shi Xiang;Zhou Lei;Wang Feng-yun. Research of damage detection to offshore platforms based on modal strain energy method considering the temperature gradient[J]. Journal of Vibration and Shock, 2012, 31(6): 90-95