Instability due to time delay and its compensation in active control of structures

Instability due to time delay and its compensation in active control of structures Time delay problem and its compensation in active control of civil engineering structures were studied. It has been shown by stability analysis of a SDOF system with time delayed feedback that the maximum allowable time delay depends not only on the natural period of the structure but also on feedback gains. We have demonstrated by numerical simulation that the performance of the control system degrades significantly when the time delay is close to this value and it even becomes unstable when time delay is greater than or equal to this value. The maximum allowable time delay decreases with decrease in natural period of the structure as well as with increase in active damping. The paper presents a technique for compensation by modelling time delay as transportation lag. This method ensures the stability of the controlled system as well as the desired response reduction. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Earthquake Engineering and Structural Dynamics Wiley

Instability due to time delay and its compensation in active control of structures

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Publisher
Wiley
Copyright
Copyright © 1993 John Wiley & Sons, Ltd
ISSN
0098-8847
eISSN
1096-9845
DOI
10.1002/eqe.4290220304
Publisher site
See Article on Publisher Site

Abstract

Time delay problem and its compensation in active control of civil engineering structures were studied. It has been shown by stability analysis of a SDOF system with time delayed feedback that the maximum allowable time delay depends not only on the natural period of the structure but also on feedback gains. We have demonstrated by numerical simulation that the performance of the control system degrades significantly when the time delay is close to this value and it even becomes unstable when time delay is greater than or equal to this value. The maximum allowable time delay decreases with decrease in natural period of the structure as well as with increase in active damping. The paper presents a technique for compensation by modelling time delay as transportation lag. This method ensures the stability of the controlled system as well as the desired response reduction.

Journal

Earthquake Engineering and Structural DynamicsWiley

Published: Mar 1, 1993

References

  • Active control and seismic isolation
    Pu, Pu; Kelly, Kelly

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