한국소음진동공학회논문집 (Transactions of the Korean Society for Noise and Vibration Engineering)

  • 제22권11호
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  • Pages.1144-1151
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  • 2012
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  • 1598-2785(pISSN)
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  • 2287-5476(eISSN)
한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
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동특성 변화를 이용한 감쇠 구조물의 손상예측

Prediction of the Damage in the Structure with Damping Using the Modified Dynamic Characteristics

  • Lee, Jung Youn (Dept. of Mechanical System Engineering, Kyonggi University)
  • 투고 : 2012.09.25
  • 심사 : 2012.10.31
  • 발행 : 2012.11.20
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초록

A damage in structure alters its dynamic characteristics. The change is characterized by changes in the modal parameter, i.e., modal frequencies, modal damping value and mode shape associated with each modal frequency. Changes also occur in some of the structural parameters; namely, the mass, damping, stiffness matrices of the structure. In this paper, evaluation of changes in stiffness matrix of a structure is presented as a method not only for identifying the presence of the damage but also locating the damage. It is shown that changed stiffness matrix can be accurately estimated a sensitivity coefficient matrix derived from modifying mode shapes, First, with 4 story shear structure models, the effect of presence of damage in a structure on its stiffness matrix is studied. By using these analytical model, the effectiveness of using change of stiffness matrix in detecting and locating damages is demonstrated. To validate the predicted changing stiffness and its location, the obtained results are compared to the reanalysis result which shows good agreement.

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참고문헌

  1. Adams, R. D., Cawley, P., Pye, C. J. and Stone, B. J., 1978, A Vibration Technique for Non-destructively Assessing the Integrity of Structures, Journal of Mechnjcal Engineering Science, Vol. 20, pp. 93-100. https://doi.org/10.1243/JMES_JOUR_1978_020_016_02
  2. Gudmundson, P., 1983, The Dynamic Behavior of Slender Structures with Cross-sectional Cracks, Journal of the Mathematics and Physics of Solids, Vol. 31, pp. 329-345. https://doi.org/10.1016/0022-5096(83)90003-0
  3. Friswell, M. I., Penny, J. E. T. and Wilson, D. A. L., 1994, Using Vibration Data and Statistical Measures to Locate Damage in Structures, Journal of Analytical and Experimental Modal Analysis, Vol. 9, No. 4, pp. 239-254.
  4. Choi, B. M. and Woo, H. K., 2007, A Study for the Comparison of Structureal Damage Detection Method Using Structural Dynamic Characteristic Parameters, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 17, No. 3, pp. 257-263. https://doi.org/10.5050/KSNVN.2007.17.3.257
  5. Zhan, I. W., Xia, H., Chen, S. Y. and De Roeck, G., 2011, Structural Damage Identification for Railway Bridges based on Train-induced Bridge Responses and Sensitivity Analysis, Journal of Sound and Vibration, Vol. 330, No. 4, pp. 757-770. https://doi.org/10.1016/j.jsv.2010.08.031
  6. Gomes, H. M. and Silva, N. R. S., 2008, Some Comparisons for Damage Detection on Structures Using Genetic Algorithms and Modal Sensitivity Method, Applied Mathematical Modelling, Vol. 32, No. 11, pp. 2216-2232. https://doi.org/10.1016/j.apm.2007.07.002
  7. Fox, R. L. and Kapoor, M. P., 1968, Rates of Change of Eigenvalues and Eigenvectors, AIAA Journal, Vol. 6, No. 12, pp. 2426-2429. https://doi.org/10.2514/3.5008