Automatic Control of a Roller Card

Abstract

Objects: 1) To determine the transfer function of a roller card by means of a sampling card. 2) To investigate the optimum condition for controlling the roller card by a closed loop control system. Methods: 1) The outline of this system is assumed from transient response in step input. Its time constant is obtained from the variance of output web produced by creating rectangular wave input with periodic revolutions of the feed roller. 2) The optimum value of the controllers is obtained by taking the unevenness of output card web as a stationary Gaussian noise. Findings : 1) The transfer function of the roller card is a linear first-order control system with a dead time. 2) PJD control is best suited to a system with a long dead time, such as a roller card. 3) PD control works better than P or Pl. 1. Preface Fig. 1 shows a control system in which uniform delivery web is obtainable by controlling the rotating speed ratio of the cylinder and feed roller in a roller card. The transfer function of the roller card and the system parameter included in the transfer function are determined theoretically and experimentally by using a sampling card. The transfer function is decided by determining the output signal which arises from step input based on the dynamic characteristic of the card. It is true that the time constant of the roller card, is turbance. It is a usual practice to evaluate the obtainable from the transient response to step input, quality of control of disturbance from the shape of but there are difficulties in determining it, because the response wave to a stepped disturbance or from supplied lap and the output response of the card the characteristic of frequency for a sinusoidal dis-are irregular. Therefore, for the sake of higher turbance. Both these methods treat disturbance accuracy, we studied the time constant by a statistical as deterministic, but we considered it essentially method using rectangular wave input, undeterministic and tried to obtain the optimum The optimum values of the functions of the values of the constants of controllers by the RMS controller were surveyed with feedback control with standard so as to keep the influence of the dis-the unevenness of delivered web taken as a disturbance at a minimum.