Real-Time Error Monitoring for Hybrid Simulation. Part II: Structural Response Modification due to Errors
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Volume 133, Issue 8
Abstract
Hybrid simulation results have been shown to be highly sensitive to measurement and control errors associated with experimental substructures. In particular, systematic control errors due to the response lag of servohydraulic actuators can substantially modify the computed hybrid model response. This paper examines the changes in the hybrid model response resulting from experimental errors and verifies the use of hybrid simulation error monitors (HSEM) presented in a companion paper to predict these changes. The effects of a restoring force time delay on the hybrid model response are first examined by deriving a transfer function for such a system. In addition, numerical simulations of hybrid simulations with induced systematic and random errors are used to study the effects of experimental errors on the linear and nonlinear seismic response of structures. The numerical models with simulated experimental errors are then used to examine the relationship between HSEM and more common performance measures for quantifying the accuracy of the simulations. Based on these numerical studies, appropriate threshold values for HSEM can be determined to detect in real time whether the specified level of unacceptable accuracy has been exceeded in a hybrid simulation.
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Acknowledgments
This work was supported in part by the NEES Program of the National Science Foundation under Award No. CMS-0086621. Their support is gratefully acknowledged. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writers and do not necessarily reflect those of the National Science Foundation.
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Information
Published In
Journal of Structural Engineering
Volume 133 • Issue 8 • August 2007
Pages: 1109 - 1117
Copyright
© 2007 ASCE.
History
Received: Apr 11, 2006
Accepted: Sep 19, 2006
Published online: Aug 1, 2007
Published in print: Aug 2007
Notes
Note. Associate Editor: Reginald DesRoches
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