We present a new method to compute output gain-scheduled controllers for nonlinear systems. We use structured H∞-control to precompute an optimal controller parametrization as a reference. We then propose three practical methods to implement a control law which has only an acceptable loss of performance with regard to the optimal reference law. Our method is demonstrated in longitudinal flight control, where the dynamics of the aircraft depend on the operational conditions velocity and altitude. We design a structured controller consisting of a PI-block to control vertical acceleration, and another I-block to control the pitch rate.
Gain-Scheduled Two-Loop Autopilot for an Aircraft
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received August 14, 2012; final manuscript received February 6, 2014; published online April 28, 2014. Assoc. Editor: Yang Shi.
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Ravanbod, L., and Noll, D. (April 28, 2014). "Gain-Scheduled Two-Loop Autopilot for an Aircraft." ASME. J. Dyn. Sys., Meas., Control. July 2014; 136(4): 041021. https://doi.org/10.1115/1.4026832
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