基于逆有限元的应变模态损伤检测方法

发布时间：2018-05-07 14:33

本文选题：逆有限元法 + 损伤检测　；参考：《振动.测试与诊断》2017年01期

【摘要】：基于光纤光栅传感器(fiber Bragg grating,简称FBG)逆有限元方法(inverse finite element method,简称iFEM),仅利用有限测点的应变数据进行全域应变场重构,得到近似完全测量应变模态,提高了直接采用实测应变数据来构建应变模态损伤指标的实用性。利用基于损伤应变模态差分原理的损伤指标法,只需用损伤后应变模态数据即能定位损伤,并给出了损伤指标数学模型。计算结果表明,基于光纤光栅传感器和逆有限元方法可以快速进行全域应变场重构,为基于应变模态的损伤检测提供数据保障,而应变模态差分曲线只在损伤处发生剧烈变化,损伤程度不同,曲线突变程度略有不同但规律一致。最后以某板的实验结果证明了该方法的有效性。
[Abstract]:Based on fiber Bragg gratings (FBG) inverse finite element method (inverse finite element method,), only the strain data of finite measurement points are used to reconstruct the global strain field, and the approximate fully measured strain modes are obtained. The practicability of directly using the measured strain data to construct the damage index of strain mode is improved. Using the damage index method based on the difference principle of the damage strain mode, the damage can be located by using the strain mode data after the damage, and the mathematical model of the damage index is given. The results show that the strain field reconstruction based on fiber grating sensor and inverse finite element method can be carried out quickly, which provides data guarantee for damage detection based on strain mode, while the strain mode difference curve only changes sharply at the damage site. The degree of damage is different, the curve mutation degree is slightly different, but the law is the same. Finally, the effectiveness of the method is proved by the experimental results of a certain plate.
【作者单位】：西北工业大学力学与土木建筑学院;西北工业大学计算机学院;
【基金】：国家自然科学基金资助项目(51278420) 中央高校基本科研业务费专项资金资助项目(3102015BJ(II)MYZ13) 西北工业大学研究生创意创新种子基金资助项目(Z2016094),西北工业大学基础研究基金资助项目(JCY20130125)
【分类号】：TP212;O346.5

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