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Instability due to time delay and its compensation in active control of structures
Author(s) -
Agrawal Anil K.,
Fujino Yozo,
Bhartia Binod K.
Publication year - 1993
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290220304
Subject(s) - control theory (sociology) , compensation (psychology) , lag , stability (learning theory) , time lag , instability , reduction (mathematics) , group delay and phase delay , engineering , smith predictor , phase compensation , control (management) , computer science , mathematics , control engineering , physics , mechanics , temperature control , electronic engineering , pid controller , telecommunications , artificial intelligence , psychoanalysis , computer network , bandwidth (computing) , psychology , geometry , machine learning , phase noise
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.