Design of an Adaptive Control System Using Frequency-Domain Criteria

Abstract

A simple and effective way of designing a self-adaptive scheme would be through realizing an invariant index of performance in a self-adaptive set-up through programming curves connecting the chosen variable controller parameter and known plant variable parameter. Such a method is used here in the development of an adaptive scheme with two subsidiary loops incorporated with nonlinear function generators and an adjustable controller, the criteria for assessment of transient response being the maintenance of desired phase-margin and grain-crossover frequency values, despite large variations in the plant's variable parameter. The adaptive behaviour of the scheme is examined by analogue computation and found quite satisfactory. The variable parameter of plant is taken as a pole. The scheme can also be extended to cases with the plant variables being a pole and open-loop gain K or two poles of the plant.

Indexing Terms:

• Adaptive Control System
• Frequency Domain Criteria