Theoretical Control and Experimental Verification of Carded Web Density Part I: Dynamic System Analysis and Controller Design

Abstract

Control of uniform carded fiber webs becomes very important when one wants to push the state of the art with faster and more accurate textile spinning. Four steps are necessary for controlling the carded web and its uniformity. First, a good design-based model of the plant needs to be considered. Second, a good actuator, sensor and, con troller that are also realizable must exist. Third, input to the controller must be con structed using knowledge of the system's dynamic response to improve system performance. Finally, all the effort of the design is meaningful only when tested by experiment. This paper presents a complete strategy for a uniform carded fiber web control system. Part I illustrates the system dynamics, stability, controllability, and observability by application to feedback control of one worker-stripper group, and uses the root-locus design technique for the controller design. At the same time, a comple mentary control scheme for precise system control is presented. This composite control method gives the corresponding closed-loop system not only a time-optimal operation, but also the most efficient, precise control properties.