基于CMSE理论和小生境遗传算法的结构多损伤检测方法研究

本文提供了一种基于交叉模态应变能简称CMSE（cross modal strain energy）和小生境遗传算法的结构多损伤位置和严重程度的有效检测方法。交叉模态应变能方法可以使用完好结构和损伤结构的任意一阶模态信息，并且可以使用极少量（例如只用一阶测量模态）的测量信息。不仅与传统的模态应变能方法相比有了很大的改进，而且对实际检测过程中的信息测量降低了要求。在损伤位置的检测中引入了小生境遗传算法，降低了计算量，提高了检测效率，有利于大型复杂结构的损伤位置检测。复合材料机翼盒段算例结果表明，CMSE方法与小生境遗传算法相结合是检测结构多损伤的有效方法之一。

Complex Damage Detection Method Based on CMSE and NicheGA

An effective method for complex damage detection using the improved Cross Modal Strain Energy(CMSE) technique and Niche Genetic algorithms is presented.The traditional modal strain energy method is not convenient for structural damage detection because it needs to compare the modal information of the same mode between the baseline and damaged structures,and also requires the analytical and measrued modes to be consistent in scale,or to be normalized.However,no such a constraint is required for the CMSE method.In addition,combination of CMSE and the Niche Genetic Algorithms method proposed here well enhances the capacity of identifying structural damage localization.Numerical studies of complex damage detection for a model of composite material airfoil case are given and the obtained results show that the method proposed is successful for complex damage detection of large structures.