The aim of the paper is to compare the respective advantages of time-domain robust linear quadratic and frequency-domain Hinfinity control laws in the presence of real parametric and frequency-dependent uncertainties. Design-application considerations for each method are also offered. For the time-domain design, the LQL method is used, which is a minimax robust state estimation-maximin state feedback closed-loop control scheme for linear systems with L2 bounded uncertainties. For comparison, the frequency-domain mixed-sensitivity Hinfinity approach is also examined. To improve its poor parametric robustness owing to LHP pole-zero cancellation property of Hinfinity controllers, increasing system bandwidth and inner-loop feedback enhancing the damping are applied simultaneously. The context of this design comparison is the HIT-3T2 flight simulator. The simulation results, once again, reveal the close relationship of LQL and Hinfinity control synthesis on the basis of game theory.
Case study comparison of robust linear quadratic design and mixed-sensitivity Hinfinity control
IEE Proceedings - Control Theory and Applications ; 144 , 5 ; 476-480
1997
5 Seiten, 11 Quellen
Aufsatz (Zeitschrift)
Englisch
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