Analytical Modeling, System Identification, and Tracking Performance of Uniaxial Seismic Simulators
Publication: Journal of Engineering Mechanics
Volume 129, Issue 12
Abstract
This technical note presents a simplified approach to reproducing historical earthquake records using uniaxial seismic simulators. Although complex, real-time feedback control systems may be utilized to control such simulators, it is shown herein that the application of a simple, off-line correction procedure is adequate for producing reasonable reproductions of historical earthquakes. An analytical model which describes the dynamic properties of a uniaxial seismic simulator is formulated in the frequency domain and calibration of the analytical model is performed via experimental system identification testing. It is shown that the model and identified properties are valid over a practical range of frequencies of motion. The analytical model is subsequently utilized in the implementation of an off-line correction procedure to improve the dynamic tracking performance of the seismic simulator. The effectiveness of the procedure is demonstrated by comparing motion of the simulator using both uncorrected and corrected command signals that correspond to historical earthquake records. The results show that the analytical model developed is adequate for describing the dynamic behavior of the seismic simulator and that the application of a simple, off-line correction procedure improves the dynamic tracking performance of the simulator.
Get full access to this article
View all available purchase options and get full access to this article.
References
Blondet, M., and Esparza, C.(1988). “Analysis of shaking table-structure interaction effects during seismic simulation tests.” Earthquake Eng. Struct. Dyn., 16, 473–490.
Conte, J. P., and Trombetti, T. L.(2000). “Linear dynamic modeling of a uni-axial servo-hydraulic shaking table system.” Earthquake Eng. Struct. Dyn., 29(9), 1375–1404.
Dai, H., Sain, M. K., and Spencer, B. F., Jr. (1997). “Using tensors to track earthquakes on hydraulic shaker tables.” Proc., American Control Conf., IEEE, Piscataway, N.J., Part 1, 1–5.
Harris, C. M. (1996). Shock and vibration handbook, 4th Ed., McGraw–Hill, New York.
Hwang, J. S., Chang, K. C., and Lee, G. C. (1987). “The system characteristics and performance of a shaking table.” National Center for Earthquake Engineering Research, Rep. No. NCEER 87-0004, State University of New York at Buffalo, Buffalo, N.Y.
Kay, S. M. (1988). Modern spectral estimation, Prentice–Hall, Englewood Cliffs, N.J.
Kuehn, J., Epp, D., and Patten, W. N.(1999). “High-fidelity control of a seismic shake table.” Earthquake Eng. Struct. Dyn., 28(11), 1235–1254.
Ljung, L. (1987). System identification: Theory for the user, Prentice–Hall, Upper Saddle River, N.J.
Lund, R. A. (1976). “Environmental simulation with digitally controlled servo-hydraulics.” Proc., Inst. of Environmental Science 22nd Annual Technical Meeting, IEST, Rolling Meadows, Ill., 65–70.
Muhlenkamp, M. J., Conte, J. P., Hudgings, T. R., and Durrani, A. J. (1997). “Analysis, design, and construction of a shaking table facility.” Rep. No. 46, Rice University, Houston, Tex.
Nepote, B., Dyke, S. J., and Caicedo, J. M. (2000). “Implementation of the transfer function iteration method for the control of earthquake simulators.” Proc., 2nd European Conf. on Structural Control.
Rea, D., Abedi-Hayati, S., and Takahashi, Y. (1977). “Dynamic analysis of electrohydraulic shaking tables.” Earthquake Engineering Research Center, Rep. No. UBC/EERC-77/29, Univ. of California, Berkeley, Calif.
Rinawi, A. M., and Clough, R. W. (1991). “Shaking table-structure interaction.” Earthquake Engineering Research Center, Rep. No. UCB/EERC-91/13, Univ. of California, Berkeley, Calif.
Spencer, B. F., Jr., and Yang, G. (1998). “Earthquake simulator control by transfer function iteration.” Proc., 12th ASCE Engineering Mechanics Conf., ASCE, Reston, Va., 776–769.
Twitchell, B. S. (1998). “Analytical modeling and experimental identification of a uniaxial seismic simulator.” MS thesis. Dept. of Civil and Environmental Engineering, Washington State Univ., Pullman, Wash.
Welch, P. D.(1967). “The use of fast Fourier transform for the estimation of power spectra: A method based on time averaging over short, modified periodograms.” IEEE Trans. Audio Electroacoust., AU-15(2), 70–73.
Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 129 • Issue 12 • December 2003
Pages: 1485 - 1488
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Jan 19, 2000
Accepted: May 14, 2003
Published online: Nov 14, 2003
Published in print: Dec 2003
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.