Study On Robust Control Strategies For Winding Tension System

Tension system is widely used in the engineering industry such as textile, papermaking, printing equipment, and wire saw. Because there are coupling between tension and velocity, parameter uncertainties,outside disturbances in the tension system, the processing efficiency and product quality are infuenced severely. So it is vital issue that how to solve the above-mentioned problems to insure the stability,precision and online regulation of tension control,which is an important project to be developed.The wire system of multi wire saw (MWS) is the typical high-velocity and high-precision winding tension system. This dissertation takes the wire subsystem of MWS as an example and studies winding tension control technology. The incising mechanism of multi wire saw and the movement of incising wire are analyzed, then the model of incising wire is set up. For the parameter uncertainties and outside disturbances,the tension robust control technologies are studied. The feasibility has been verified by simulations and experiments.For the charastics of MWS, the key parts of wire tension system are analyzed such as winding subsystem (unwinding system), dancing arm and these models set up. The method on modeling of incising wire is studied. Using the principle of hooke, the principle of coulomb, the principle of mass conservation and speed equation, the model of tension system is set up.The structural parameters of incising wire system are changed by rolling diameter and the coupling between between tension and velocity is strong, which relations are analyzed. Because there are parameter uncertainties, outside disturbances in the multi wire saw tension system, tension self-optimizing robust control strategy based on hyper generation genetic algorithm (HGGA) is proposed. The relation between robust performance and weighting function is studied. In terms of error and error change ratio of tension, the state of tension system is confirmed, and then the optimizing parameters of tension robust controller can be obtained using HGGA. The robust control method proposed can restrain interference, realize the online regulation of tension controller and keep the winding (unwinding) subsystem stable.Finally, for the charestics of incising wire, the tension system platform is build up and the algorithms above are tested in tension platform. Through the comparison of experiments results, the better tension static difference ratio and tension fluctuation ratio can be obtained in tension system that the tension self-optimizing robust control strategy based on HGGA algorithm is adopted. The tension self-optimizing robust control strategy achieves the requirement for tension control and the expected goals.This study lays a new method for the theories and application research of the complex winding tension control systems. The research achievements could be used as a theoretical foundation and applied to solve the problem of winding tension control system. It is especially valuable for the design and development of the small tension and wire winding system.