Abstract
In recent years, Structural Health Monitoring (SHM) has emerged as a new research area in civil engineering. Most existing health monitoring methodologies require direct measurement of input excitation for implementation. However, in many cases, there is no easy way to measure these inputs - or alternatively to externally excite the structure. Therefore, SHM methods based on ambient vibration have become important in civil engineering. In this paper, an approach is proposed based on the Damage Location Vector (DLV) method to handle the ambient vibration case. Here, this flexibility-matrix-based damage localization method is combined with a modal expansion technique to eliminate the need to measure the input excitation. As a by-product of this approach, in addition to determining the location of the damage, an estimate of the damage extent also can be determined. Finally, a numerical example analyzing a truss structure with limited sensors and noisy measurement is provided to verify the efficacy of the proposed approach.
Similar content being viewed by others
References
Alvin, K.F. and Park, K.C., (1994), “Second-order Structural Identification Procedure via State-Space-Based System Identification,” AIAA Journal, 32(2): 397–406.
Bernal, D., (2000), “Extracting Flexibility Matrices from State-Space Realizations,” COST F3 Conference, Madrid, Spain, 127–135.
Bernal, D., (2002a), “Load Vectors for Damage Localization,” Journal of Engineering Mechanics, 128(1): 7–14.
Bernal, D. and Gunes, B., (2002b), “Damage Localization in Output-only Systems: A Flexibility Based Approach,” IMAC-XX, Los Angeles, California, 1185–1191.
Cha, P.D. and Tuck-Lee, J.P., (2000), “Updating Structural System Parameters Using Frequency Response Data,” Journal of Engineering Mechanics, 126(12): 1240–1246.
Dyke, S.J., Caicedo, J.M. and Johnson, E.A., (2000), “Monitoring a Benchmark Structure for Damage Identification,” Proceedings of the Engineering Mechanics Specialty Conference, Austin, Texas, 21–24.
Ewins, D.J., (1985), Modal Testing: Theory and Practice, John Wiley New York.
James, G.H. III, Carne, T.G. and Lauffer, J.P., (1993), “The Natural Excitation Technique (NExT) for Modal Parameter Extraction from Operating Wind Turbines,” SAND92-1666, UC-261, Sandia National Laboratories.
Juang, J.N. and Pappa, R.S., (1985), “An Eigensystem Realization Algorithm for Modal Parameter Identification and Model Reduction,” Journal of Guidance Control and Dynamics, 8: 620–627.
Lipkins, J. and Vandeurzen, U., (1987), “The Use of Smoothing Techniques for Structural Modification Applications,” Proceedings of 12 International Seminar on Modal Analysis, S1–3.
Pandey, A.K. and Biswas, M., (1994), “Damage Detection in Structures Using Changes in Flexibility,” Journal of Sound and Vibration, 169(1): 3–17.
Pandey, A.K. and Biswas, M., (1995), “Damage Diagnosis of Truss Structures by Estimation of Flexibility Change,” The International Journal of Analytical and Experimental Modal Analysis, 10(2): 104–117.
Toksoy, T. and Aktan, A.E., (1994), “Bridge-Condition Assessment by Modal Flexibility,” Experimental Mechanics, 34: 271–278.
Vandiver, J.K., (1975), “Detection of Structural Failure on Fixed Platforms by Measurement of Dynamic Response,” Proceedings of the 7th Annual Offshore Technology Conference, 243–252.
West, W.M., (1984), “Illustration of the Use of Modal Assurance Criterion to Detect Structural Changes in an Orbiter Test Specimen,” Proceedings Air Force Conference on Aircraft Structural Integrity, 1–6.
Author information
Authors and Affiliations
Corresponding author
Additional information
Sponsored by: Notional Science Foundation Grant CMS 99-00234
Rights and permissions
About this article
Cite this article
Gao, Y., Spencer, B.F. Damage localization under ambient vibration using changes in flexibility. Earthq. Engin. Engin. Vib. 1, 136–144 (2002). https://doi.org/10.1007/s11803-002-0017-x
Issue Date:
DOI: https://doi.org/10.1007/s11803-002-0017-x