Geometric approach and structure at infinity controls for the disturbance rejection

This study presents two methods to solve the disturbance rejection problem: the structure at infinity control and geometric approach control. The main result of this study is although the two methods are different, in both cases if the problem has a solution, the transfer function of the outputs and the disturbances is null. Both methods are applied in a mechanical system and a thermal system showing a good performance. © 2012 The Institution of Engineering and Technology