CASE-STUDY COMPARISON OF LINEAR-QUADRATIC REGULATOR AND H-INFINITY CONTROL SYNTHESIS

The goal of this paper is to compare the relative strengths of Linear quadratic and H-infinity multivariable control law synthesis technique s, Design application considerations for each approach are also offere d, The context of this design comparison is the AIAA Design Challenge in Automatic Control, The linear quadratic regulator (LQR) and H-infin ity approaches are compared through the design of lateral-directional control laws for a single-night condition, Desired dying quality chara cteristics are implemented through the utilization of an explicit mode l-following flight control system, With the model-following control sy stem, the pilot commands the desired response (i.e., lateral stick for ce is used to command roll rate, instead of aileron deflection). The c ontrol system design is based on the notion of generalized actuators a nd the use of a control selector to distribute commands to the redunda nt effecters.