抄録
This paper presents a method for designing discrete-time adaptive pole placers applicable to nonminimum-phase plants of unknown order and unkown dead-time.
An adaptive pole placer has attracted attention as an adaptive controller applicable to nonminimum-phase plants. However most of the conventinal design methods for the placer require the exact order of the plant of unknown characteristics and resitrict their applications to existing plants. A conceivable approach to the plant of unknown order will be the one based on a reduced order model to it, in consideration of unmodeled dynamics effects. In such approach the indirect method could remain as a potential one since the placers designed via the direct method are very sensitive to unmodeled dynamics and haadly parform stably.
The method to be presented here is, an indirect method based on reduced order model, which is characterized by the employments, to overcome the effects of unmodeled dynamics, both of a new parameter adjustment algorithm having attractive properties and of a variable limiter being able to change its limiting level adaptively. The placers designed by the method are stable in global sense and exhibit reasonable performance.
