Damage Detection Method for Composite Structures Based on a Combined Technique of Cross Modal Strain Energy and Niche Genetic Algorithms

Abstract

This paper presents an effective method for structural damage detection using the combined technique of the up-to-date cross modal strain energy (CMSE) and niche genetic algorithms (GAs). The traditional modal strain energy method is not convenient for structural damage detection because it needs to compare the modal information between the same modes of the baseline and damaged structures, and also requires the analytical and measured modes to be consistent in scale, or to be normalized, but no such constraint is required for the CMSE method. However, the current CMSE method is still deficient because it cannot effectively determine the locations of structural damage. In order to overcome the shortcoming of the CMSE method in structural damage detection, a combined method of the CMSE with the niche GAs is proposed in this paper to enhance the capability of identifying structural damage location. Numerical studies of damage detection for the case of a model of an airfoil of composite material are given, and the obtained results show that the method proposed in this paper is successful to detect the damage of complex structures.

Keywords

Composite structure cross modal strain energy niche genetic algorithms structural damage detection.

Get full access to this article

View all access options for this article.

References

Yan, Y.J. , Cheng, L. , Wu, Z.Y. , and Yam, L.H. , 2007, "Development in vibration-based structural damage detection technique," Mechanical Systems and Signal Processing 21(5), 2198-2211.

Kim, J.T. and Stubbs, N. , 2002, "Improved damage identification method on modal information ," Journal of Sound and Vibration 252, 223-238.

Hu, S.-L.J. , Wang, S.Q. , and Li, H.J. , 2006, "Cross-modal strain energy method for estimating damage severity," ASCE Journal of Engineering Mechanics 132, 429-437.

Ren, W.X. and Roeck, G.D. , 2002, "Discussion of structural damage detection from modal strain energy changes," ASCE Journal of Engineering Mechanics 128, 376-378.

Shi, Z.Y. , Law, S.S. , and Zhang, L.M. , 1998, "Structural damage detection from modal strain energy change," Journal of Sound and Vibration 218, 825-844.

Shi, Z.Y. , Law, S.S. , and Zhang, L.M. , 2000, "Structural damage detection from modal strain energy change," ASCE Journal of Engineering Mechanics 126, 1216-1223.