Journal of Advanced Marine Engineering and Technology

  • 제35권2호
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  • Pages.271-277
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  • 2011
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  • 2234-7925(pISSN)
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  • 2234-8352(eISSN)
한국마린엔지니어링학회 (The Korean Society of Marine Engineering)
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유전알고리즘에 의한 강봉의 감쇠행렬 산출법

Identification of Damping Matrix for a Steel Bar by the Genetic Algorithm

  • 투고 : 2011.12.07
  • 심사 : 2011.02.28
  • 발행 : 2011.03.31
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초록

이 연구에서는 유전알고리즘을 이용하여 강봉의 감쇠행렬을 산출하는 방법을 제안하다. 감쇠행렬이 강성행렬과 비례한다는 가정을 전제로 각 요소강성행렬에 임의의 정수를 곱하여 감쇠행렬을 구성하여 주파수응답함수를 구성하고, 이를 실험 주파수응답함수와 비교한 값을 목적함수로 하여 목적함수가 가장 작은 정수의 감쇠행렬을 구한다. 비감쇠 해석의 경우보다 목적함수의 값이 약 1/60로 작아지는 것을 알 수 있었다. 이를 이용하면 큰 구조물의 감쇠가 큰 일부 부분구조물을 떼어내어 감쇠행렬을 구할 수 있어 구조물의 감쇠진동해석을 하는데 도움이 될 것으로 사료된다.

An identification method of the structural damping matrix for a steel bar by the genetic algorithm is proposed. Supposing the damping matrix were in proportion to the stiffness matrix, the proportional factors can be identified from the curve fitting of the experimental frequency response function(FRF) by the genetic algorithm. Applying the identified damping matrix to FEM of a beam model, the values of the objective function could be reduced to about 1/60 in comparison with conventional FEM model without damping. The damping matrices of some sub-structures which have large damping partly could be identified by the algorithm, and they could be used as some parts of the FEM model for a whole structure.

키워드

참고문헌

  1. Beliveau, J., "Identification of viscous damping structures from modal information", American Society of Engineers Applied Mechanics, vol. 43, p. 335, 1976. https://doi.org/10.1115/1.3423835
  2. Burak, S. and Rsm, Y. M., "The construction of physical parameters from modal data", Mechanical Systems and Signal Processing, vol. 15, no. 1, p. 3, 2001.
  3. Fritzen, C. P., "Identification of mass, damping, and stiffness matrices of mechanical system", American Society of Mechanical Engineers Journal of Vibration, Acoustics, Stress, and Reliability in Design, vol. 108, p. 9, 1986. https://doi.org/10.1115/1.3269310
  4. Wang, J. H., "Mechanical parameters identification with special consideration of noise effects", Journal of Sound and Vibration, vol. 125, no.1, p. 151, 1988. https://doi.org/10.1016/0022-460X(88)90423-3
  5. Jeong, W. B., Okuma, M. and Nagamatsu, A., "Experimental identification of mechanical Structure with characteristic matrices", JSME International Journal Series 3, vol. 32, no.1, p. 30, 1989.
  6. Jeong, W. B., and Nagamatsu, A., "A new approach for identification of physical matrices by modal testing", Proc. of the 10th IMAC, p. 256, 1992.
  7. Kim, K. S. and Kang, Y. J., "Identification of structural parameters from frequency response functions", Proceedings of the Korean Society for Noise and Vibration Engineering Conference Korea, p. 863, 2007(in Korean).
  8. Park S. C., Je H. K., Yi G. J., Park Y. B. and Park K. I., "Identification of Structural Characteristic Matrices of Steel Bar by Genetic Algorithm", Proceedings of the Korean Society for Noise and Vibration Engineering Conference Korea, vol. 20, no. 10, p. 946, 2010(in Korean). https://doi.org/10.5050/KSNVE.2010.20.10.946
  9. Nagamatsu, A., "Modal analysis", Baifukan, p. 81, 1985.

피인용 문헌

  1. Nonproportional viscous damping matrix identification using frequency response functions vol.40, pp.4, 2016, https://doi.org/10.5916/jkosme.2016.40.4.369
  2. 발포스펀지 의자시트의 진동전달 특성 vol.16, pp.1, 2011, https://doi.org/10.9726/kspse.2012.16.1.024