SENSITIVITY MODEL AND SYNTHESIS OF DEAD-BEAT ALGORITHMS IN DIGITAL SERVOSYSTEMS

The design of a sensitivity model of a digital servosystem with cascad e control and dead-beat control algorithms is described. The problem o f sensitivity model instability is discussed and a possible approach t o obtaining a stable model proposed. An explicit relation was derived relating the changes of dead-beat control algorithm parameters to the absolute sensitivity functions of the measured output variable. The co mputer simulation results of parameter synthesis applied to the dead-b eat dc motor armature current and angular speed control algorithms ind icate that the tuning of control algorithm parameters is completed aft er a single iteration for smaller changes of drive parameters, while t wo or more iterations are required in case of large changes of drive p arameters. The developed method for synthesis of time optimal controll er parameters could be suitable for adaptive control with self-tuning of control algorithm parameters.