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Study on Autoleveller System Modeling and Control Theory of Drawing Frame

Author: LiHongLiang
Tutor: ZhouWuNeng
School: Donghua University
Course: Control Theory and Control Engineering
Keywords: System model Autoleveller Double open-loop system Generalized Predictive Control Fuzzy Control
CLC: TS103.2
Type: Master's thesis
Year: 2010
Downloads: 72
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Abstract

The degree of irregularity of the yarn is directly related to the quality of the yarn, good or bad, but also indirectly affect the quality of the finished product. And the unevenness of the yarn, particularly long fragment unevenness is mainly caused by the spinning step link. Therefore, how to minimize the unevenness of sliver, has been an urgent study of the textile industry. Improvement and self-leveling performance of the machine is to ensure that the premise of the quality of spinning at high speed out of the bar. This paper presents a new autoleveller control system: on the basis of analysis of the textile and machine self-leveling control system the pros and cons of dual open-loop control system, and gives the mathematical model of the new control system, a detailed analysis of the mathematical principles expounded the theoretical basis of double open ring autoleveller control system. By comparing the open-loop control system, closed-loop control systems and hybrid-loop control system of double open-loop control system to shorten the blind spot, eliminating the dead zone, and twice Leveling evenness of quality characteristics. Through analysis drawframes autoleveler the characteristics of the whole process, double open-loop system using generalized predictive control theory and fuzzy control theory control program. Generalized predictive control is used in the paper based on the experimental model of the process to predict the output of the process, then the actual process output and the predicted output of the differential correcting the corrected result as a feedback quantity, sent compared with set values, so that by the well control action generated by the comparison result allows the process output to track the trajectory of the specified output. Predictive control optimization algorithm can constantly optimize computing timely correction control role, so that by the time-varying interference caused by the uncertain performance be compensated in a timely manner to improve the effect of the system's control. Through the analysis of the text, according to the actual operating conditions of the Machine and the control parameters available, open-loop fuzzy control. Fuzzy control a humanoid control is transformed through experience points to the clear value measurement for the amount of blur, meet certain control accuracy to establish reasonable rules of fuzzy, fuzzy control to be able to do an effective and timely self-leveling control . Simulation by PID fuzzy controller, vividly demonstrated the effectiveness of fuzzy control in autoleveller control. Since generalized predictive control and fuzzy control of the respective characteristics match coordination and control environment, dual open-loop system can inhibit the delay, the strong random disturbance and parameter time-varying, and be able to respond quickly to reduce the error, which in and high-speed operation of the machine The situation, improve autoleveller effect. Moreover, the two open-loop superimposed Leveling, eliminating even and orderly dead, do real-time targeted control and further optimize autoleveller effect. Finally, through simulation and analyzed obtained dual open-loop control system has a stable control performance, can Leveling wider wavelength sliver, there is no auto-level dead and neat and well-spaced blind area, and further optimization of the auto-level, improved in many ways since The leveler technical level, to promote the in-depth development of the technology research autoleveller.

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CLC: > Industrial Technology > Light industry,handicrafts > Textile industry,dyeing and finishing industry > General issues > Textile industry machinery and equipment > Spinning equipment ( textile machinery )
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