In this study, a new damage detection algorithm for specific types of damages such as breathing cracks, which are called “active discontinuities” in this paper, is proposed. The algorithm is based on the nonlinear behavior of this class of damages and hence, is more precise and sensitive to damage compared to other common linear methods. The active discontinuities can be regarded as additional degrees of freedom (DOFs) which need energy to be excited. Because the input energy of both the intact and the damaged structures is finite, the energy content of vibrating modes will be changed due to damage. Thus, the properties of distribution of energy between vibrating modes can be used as indices for detecting damage. An essential detectability condition using this concept is decomposing a signal such that no spurious mode imposed to its expansion. In order to satisfy this condition, Empirical Mode decomposition (EMD) is used to extract the vibrating modes since all nonlinearities in a signal are preserved while no spurious mode or assumption of stationarity is imposed on the problem. Prevention of mode mixing, which is an important drawback of EMD, is another necessary condition for robustness of the algorithm. A solution is proposed in this paper to satisfy this condition in which special constraints are imposed on the normal procedure of EMD. Then, the fourth central moment, kurtosis, is used to compare the distribution of energy between the modified vibrating modes. The algorithm is verified through experimental testing of a simple steel cantilever structure under various damage scenarios. Results demonstrate the efficacy of the method for detecting discontinuities in a real structure.
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ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
September 16–18, 2013
Snowbird, Utah, USA
Conference Sponsors:
- Aerospace Division
ISBN:
978-0-7918-5604-8
PROCEEDINGS PAPER
Structural Damage Detection Based on Energy Transfer Between Intrinsic Modes
Reza Mohammadi Ghazi,
Reza Mohammadi Ghazi
Massachusetts Institute of Technology, Cambridge, MA
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James Long,
James Long
Massachusetts Institute of Technology, Cambridge, MA
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Oral Buyukozturk
Oral Buyukozturk
Massachusetts Institute of Technology, Cambridge, MA
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Reza Mohammadi Ghazi
Massachusetts Institute of Technology, Cambridge, MA
James Long
Massachusetts Institute of Technology, Cambridge, MA
Oral Buyukozturk
Massachusetts Institute of Technology, Cambridge, MA
Paper No:
SMASIS2013-3022, V002T05A004; 7 pages
Published Online:
February 20, 2014
Citation
Ghazi, RM, Long, J, & Buyukozturk, O. "Structural Damage Detection Based on Energy Transfer Between Intrinsic Modes." Proceedings of the ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. Volume 2: Mechanics and Behavior of Active Materials; Structural Health Monitoring; Bioinspired Smart Materials and Systems; Energy Harvesting. Snowbird, Utah, USA. September 16–18, 2013. V002T05A004. ASME. https://doi.org/10.1115/SMASIS2013-3022
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