Posterior Time‐Step Adjustment in Pseudodynamic Testing
Publication: Journal of Engineering Mechanics
Volume 119, Issue 7
Abstract
Experimental errors are inevitable in pseudodynamic testing. Some of these errors can be monitored during the test, but, due to limitations in control system, they cannot be eliminated. For example, one cannot control exactly the displacements that are actually imposed on the structure at each time step. This paper focuses on a technique to minimize the cumulative effect of such control errors. For this purpose, a posterior adjustment of the time increment from a target value to an adjusted value is performed to minimize the effect of the control errors. The method is particularly for effective single‐degree‐of‐freedom systems and systematic errors. These systematic errors can have a very detrimental effect, and they are eliminated almost completely for the single‐degree‐of‐freedom example considered. For random errors that are probabilistically independent from one time step to the next, the method can have a deleterious effect on the error propagation characteristics, even though the control errors at each time step are reduced. However, since the effect of such random errors is small, this is not a serious draw‐back. For multi‐degree‐of‐freedom systems, posterior time step adjustment can also improve the error‐propagation characteristics for certain systematic errors but its effectiveness is more limited.
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References
1.
Hughes, T. J. R. (1983). “Analysis of transient algorithms with particular reference to stability behavior.” Computational methods for transient analysis, T. Belytschko and T. J. R. Hughes, eds., North‐Holland Publishing Co., New York, N.Y.
2.
Hughes, T. J. R. (1987). The finite element method, linear static and dynamic finite element analysis. Prentice‐Hall, Inc. Englewood Cliffs, N.J.
3.
McClamroch, H. N. (1985). “Displacement control of flexible structures using electrohydraulic servo‐actuators.” J. Dynamic Systems, Measurement and Control, 107(Mar.), 34–39.
4.
Newmark, M. N. (1959). “A method of computation for structural dynamics.” J. Engrg. Mech. Div., ASCE, 85(3), 67–95.
5.
Peek, R., and Yi, W. H. (1990a). “Error analysis for the pseudodynamic test method. Part I—Analysis.” J. Engrg. Mech., ASCE, 116(7), 1618–1637.
6.
Peek, R., and Yi, W. H. (1990b), “Error analysis for the pseudodynamic test method. Part II—Application.” J. Engrg. Mech., ASCE, 116(7), 1638–1658.
7.
Shing, P. S. B., and Mahin, S. A. (1983). “Experimental error propagation in pseudodynamic testing.” Rep. No. UCB/EERC‐83/12, Earthquake Engrg. Res. Ctr., Univ. of California, Berkeley, Calif.
8.
Takanashi, K., and Nakashima, M. (1986), “A state of the art: Japanese activities on on‐line computer test control method.” Rep. of the Inst. of Ind. Sci., The Univ. of Tokyo, Tokyo, Japan, 32(3).
9.
Thewalt, C. A., and Mahin, S. A. (1987). “Hybrid solution techniques for generalized pseudodynamic testing.” Rep. No. UCB/EERC‐87/09, Earthquake Engrg. Res. Ctr., Univ. of California, Berkeley, Calif.
10.
Yi, W. H. (1991). “Towards reducing the effect of control errors in pseudodynamic testing: Formulation, implementation, and evaluation.” Rep. No. UMCE 91‐2, Dept. of Civ. Engrg., The Univ. of Michigan, Ann Arbor, Mich.
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Copyright © 1993 American Society of Civil Engineers.
History
Received: Sep 4, 1992
Published online: Jul 1, 1993
Published in print: Jul 1993
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