Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
권호 표지
DOI QR코드

DOI QR Code

Modal Properties and Force Identification Algorithm of a Building Structure Using Acceleration Responses and ICA Technique

가속도응답과 ICA 기법을 이용한 구조물의 모드특성 및 하중 동시추정기법

  • Received : 2013.12.04
  • Accepted : 2014.01.24
  • Published : 2014.02.28
⟨ Previous Next ⟩

Abstract

In this paper, a new system-force identification technique in frequency domain is proposed that is simultaneously to estimate the natural frequency, damping ratio and external modal load by back-calculation from the Kalman filter and the acceleration responses of building structure. The technique is a kind of output-only system identification method to predict the dynamic properties of governing modes separated by applying independent component analysis to the measured acceleration responses and then by minimizing the performance index cooperated with a power spectral density and its derivative of estimated modal load by Kalman filter and the corresponding modal responses. For the verification of the proposed method, a numerical simulation for SDOF system and an application for in-situ measurement data were performed. The results from the simulations show that the proposed technique can estimate the modal properties and modal load more precisely than a conventional output-only subspace identification technique. Because the damping ratio obtained by the proposed technique has a some variations depending on the number of sections for averaging and a duration time in the process of in-situ measurement, so it needs a profound research and additional verification process for more stable estimation of damping ratio.

Keywords

Acknowledgement

Supported by : 한국연구재단

References

  1. Van Overschee, P., De Moor, B., Subspace identification for Linear Systems, Kluwer Academic Publishers, 1996.
  2. Ibrahim, S.R., Random decrement technique for modal identifications of structures. Journal of Spacecraft 14(11), p.p.696-700, 1997.
  3. Juang, J.N., Pappa, R.S., An eigensystem realization algorithm for modal parameter identification and model reduction. Journal of Guidance Control Dynamics. 8. p.p. 620-627, 1985. https://doi.org/10.2514/3.20031
  4. Ibrahim, S.R., Asmussen, J.G., Brincker, R., Vector triggering andom decrement for highidentification accuracy. Journal of Vibration and Acoustic. Trans. ASME 120(4), p.p. 970-975, 1998. https://doi.org/10.1115/1.2893928
  5. Brincker, R., Zhang, L., Andersen, P., Modal identification of output-only systems using frequency domain decomposition, Smart Materials and Structures 10, p.p. 441-445, 2001 https://doi.org/10.1088/0964-1726/10/3/303
  6. Ku, C.J., Cermark, J.E., Chou, L.S., Random decrement based method for modal parameter identification of a dynamic system using acceleration responses, Journal of Wind Engine ering and Industrial Aerodynamics 95, p.p. 389-410, 2007 https://doi.org/10.1016/j.jweia.2006.08.004
  7. Lu, Z.R., Law, S.S., Force identification Based on Sensitivity in Time Domain, Journal of Engineering Mechanics, ASCE, p.p.1050-1056, October 2006.
  8. Law, S.S., Bu, J.Q., Zhu, X.Q., Time-varying wind loadid entification from structural responses, Engineering Structures, 27, p.p. 1586-1598, 2005. https://doi.org/10.1016/j.engstruct.2005.05.007
  9. Liu, Y., Steve Shepard Jr, W., Dynamic force identification based on enhanced least squares and total least-squares schemes in the frequency domain, Journal of Sound and Vibration 282, p.p. 37-60, 2005. https://doi.org/10.1016/j.jsv.2004.02.041
  10. Hwang, J.S., Kareem, A., Kim, W.J., Estimation of modal loads using structural response, Journal of Sound and Vibration, 326, p.p. 522-539, 2009 https://doi.org/10.1016/j.jsv.2009.05.003
  11. Hwang, J.S., Kareem, A., Kim, H., Wind load identification using wind tunnel test data by inverse analysis, J. Wind Eng. Ind. Aerodyn. 99, p.p. 18-26, 2011. https://doi.org/10.1016/j.jweia.2010.10.004
  12. Chan, T.H.T., Law, S.S., Yung, T.H., An Interpretive Method for Moving Force Identification, Journal of Sound and Vibration 219(3), p.p. 503-524, 1999. https://doi.org/10.1006/jsvi.1998.1904
  13. Zhu, X.Q., Law, S.S., Practical Aspects in Moving Load I dentification, Journal of Sound and Vibration, 258(1), p.p.123-146, 2002. https://doi.org/10.1006/jsvi.2002.5103
  14. Yu, L., Chan, T.H.T., Recent research on identification of moving loads on bridges, Journal of Sound and Vibration 305, p.p. 3-21, 2007. https://doi.org/10.1016/j.jsv.2007.03.057
  15. Roberts S., Everson.R., Independent Component Analysis : Principles and Practice, Cambridge Univ. 2001.
  16. 강경수, 김홍진, 황재승, 독립성분분석(ICA)법을 이용한 병진-비틀림 연계된 구조물의 모드분리 및 응답기반 시스템식별, 대한건축학회 논문집(구조계): v.28 n.2 (2012-02)
  17. 박성철, 황재승, 이상현, ICA 기법을 이용한 실구조물의 모드특성 추정에 관한연구, 대한건축학회지회연합회논문집: 제15권 제2호, p.p. 159-166 (2013-04)
  18. 박성철, 최준성, 황재승, 조봉호, 조지성, 역해석기법을 이용한 새로운 응답기반 시스템 식별, 한국풍공학회 2013년도 제16회 학술대회, p.p. 79-84, 2013.5.