Model- and Non-model-based Damage Detection Methods Using Vibration Data

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W.D. Zhu

Abstract

Modal parameters of a structure, including natural frequencies, modal damping ratios and mode shapes, are directly related to its material properties, such as mass, damping and stiffness. Changes in material properties of a
structure due to occurrence of damage can result in those in its modal properties. In this work, model- and non-modelbased structural damage detection methods by use of modal parameters are introduced. The model-based method uses changes in natural frequencies of a structure; it requires an accurate physics-based model of the structure and a minimum amount of vibration measurement. The nonmodel-based methods use measured mode shapes and curvature mode shapes, and they do not require use of structural models. Experimental damage detection on a space frame, a beam and a plate are carried out to validate the model- and non-model-based methods.

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Keywords

PHM

References
1. Doebling, S. W., Farrar, C. R., & Prime, M. B. (1998). A Summary Review of Vibration-based Damage Identification Methods. Shock and Vibration Digest, 30(2), 91-105.
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3. He, K., & Zhu, W. D. (2011). Finite Element Modeling of Structures with L-shaped Beams and Bolted Joints. Journal of Vibration and Acoustics, 133(1), 011011.
4. Zhu, W. D., & He, K. (2013). Detection of Damage in Space Frame Structures with L-shaped Beams and Bolted joints Using Changes in Natural Frequencies. Journal of Vibration and Acoustics, 135(5), 051001.
5. Xu, Y. F., Zhu, W. D., Liu, J., & Shao, Y. M. (2014). Identification of Embedded Horizontal Cracks in Beams Using Measured Mode Shapes. Journal of Sound and Vibration, 333(23), 6273-6294.
6. Xu, Y. F., & Zhu, W. D. (2017). Non-model-based Damage Identification of Plates Using Measured Mode Shapes. Structural Health Monitoring, 16(1), 3-23.
Section
Invited Papers