Automatic Weight Selection in H∞ Loop Shaping Using Genetic Algorithm

A genetic-algorithm (GA) based strategy is presented for suitable weight selection in H_∞ loop shaping. The loop shaping is currently performed manually and usually a trial and error method. To solve this problem an automatic loop-shaping method based on GAs is introduced and air vehicle example is used to examine the performance of the proposed automatic loop shaping. A classical PID compensator tuned by using genetic algorithm is used as weight (pre-compensator) in H_∞ loop shaping for design of pitch controller. Analysis has been carried out using, singular value and step response plots. The analysis and results achieved indicate that H_∞ controller so designed via proposed automatic loop shaping control theory provides good performance and robust stability at different flight conditions for attitude control of air vehicle