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A two-step approach for damage detection in laminated composite structures using modal strain energy method and an improved differential evolution algorithm

机译：模态应变能法和改进的差分进化算法的两步法检测叠层复合结构损伤

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The paper presents a two-step approach based on modal strain energy method and an improved differential evolution algorithm for damage detection in laminated composite structures. First, the modal strain energy based method is employed to identify a set of potential damaged elements. Then, the improved differential evolution algorithm is utilized to minimize the function of mode shape error with design variables relating to the extent of identified damaged elements. Here, the function of mode shape error is defined by the shift between the mode shape of the damaged structure and that of the healthy structure. The proposed approach is applied for a cross-ply (0 degrees/90 degrees/0 degrees) laminated composite beam and a cross-ply (0 degrees/90 degrees/0 degrees) square laminated composite plate with multiple damaged elements. In addition, the effect of noise on the accuracy of damage identification is also investigated. Numerical results show that the proposed approach is effective for damage detection in laminated composite beam and plate structures for both cases with noise and without noise. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文提出了一种基于模态应变能方法的两步法和一种改进的差分演化算法，用于层状复合结构的损伤检测。首先，采用基于模态应变能的方法来识别一组潜在的损坏元素。然后，利用改进的差分演化算法，利用与已识别出的损坏元件的范围有关的设计变量，使模态形状误差的函数最小化。在此，模态形状误差的功能由受损结构的模态形状与健康结构的模态形状之间的偏移来定义。所提出的方法适用于多层（0度/ 90度/ 0度）层压复合梁和具有多个损坏元素的方形（0度/ 90度/ 0度）正方形层压复合板。此外，还研究了噪声对损伤识别精度的影响。数值结果表明，该方法对于有噪声和无噪声两种情况下的复合材料叠层梁和板结构损伤检测都是有效的。 （C）2016 Elsevier Ltd.保留所有权利。

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