电液张力控制系统的研究

【作者】 王丰；

【导师】 丁凡；

【作者基本信息】 浙江大学 ， 机械电子工程， 2002， 硕士

【摘要】 张力控制是许多工业生产过程控制中的一个重要的组成环节。它对提高产品质量、增强系统控制安全等方面起着至关重要的作用。论文采用电液比例控制技术通过调节液压马达进出口压差，控制其输出扭矩，在完成卷绕机构收放过程中，对缆或织物的张力控制的方法是可行有效的。电液张力控制系统中因系统的阻尼比较小容易引起的系统不稳定等问题，可以通过增加机械结构的阻尼器或者通过控制程序中PID校正环节进行补偿等方法加以解决，提高系统的稳定性与控制精度。论文针对缆张力控制系统与卷染机张力控制系统的结构组成及控制原理进行了理论分析与大量的试验研究，建立了系统的较为完善的数学模型并使用MATLAB工具对系统进行了仿真。仿真结果有助于系统结构参数的确定，试验结果表明系统的数学模型基本能够反映张力控制的动态过程，系统的张力控制是稳定的可靠的，理论分析及试验所得到的结论对今后的电液比例/伺服张力控制系统的设计及研究具有指导意义。论文内容如下： 第一章绪论，概述了张力控制系统的应用领域；张力控制的几种主要方式；电液比例控制技术的简介；以及本文主要的研究内容和选题意义。 第二章电液张力控制系统的结构与原理，由两个部分组成，第一部分是缆张力控制系统，从总体上介绍缆张力控制系统结构与原理，然后分别介绍系统的各个组成部分，包括液压系统，微机控制系统等。第二部分是卷染机张力控制系统，简述了卷染机的工作原理与系统结构。最后讨论了在卷绕机构中影响张力控制的几个主要因素。 第三章是对张力检测环节的分析，本章分别研究两个系统的检测环节，分析各自的特点。首先建立缆张力检测环节的数学建模，对其进行动静态分析，检验检测环节的稳定性与准确性。再对卷染机张力检测环节进行研究。最后对两个系统的张力检测环节进行对比分析。 第四章张力控制系统的仿真和试验分析，第一部分是对缆张力控制系统的仿真和试验分析。首先完成缆张力控制系统的受力分析，建立了系统的数学模型，对其进行静动态分析，并根据建立的模型使用MATLAB完成系统的动态仿真，探讨了改善系统性能的控制方法，对系统进行校正，提高系统的稳定性和控制精度。完成了大量的现场试验研究，解决了张力的标定、滞环校正、改进型PID控制算法、克服信号干扰等几个重要问题。第二部分是建立了卷染机张力控制系统的数学模型，控制方式及校正方法的分析，完成了卷染机张力控制系统的试验，取得了有益的结论。 第五章是总结与展望，总结了电液张力控制系统的结论，提出了应用前景和展望。更多还原

【Abstract】 Tension control is a very important part of process control in many industrial applications, and plays an important role in improving product quality ^ enhancing system control security and etc. In this paper, electro-hydraulic proportional control methods are applied to control the export tension of the hydraulic motor and also the related winding machine by modulating the pressure difference between the inlet and outlet of the hydraulic motor, and the control methods are proven feasible. System instability caused by damp ratio of the control system can be resolved by adding mechanical damper or compensating through PID control segment. Theoretical analysis and experimental results are presented on system structure and control principles of the cable tension control system and the jigger tension control system, mathematic module is built up and corresponding simulation by MATLAB is executed, the simulation results aid to decide the structural parameters. The experiment results show that the mathematic module can reflect the dynamic process of the tension control, and the system is stable and reliable. So the theoretical analysis and the experiment conclusions in this paper can be practical and directive to the design and research of the later electro-hydraulic proportional/servo control system. Details are as follows:The first chapter introduces the applied areas of the tension control, the main methods applied presently, the electro-hydraulic proportional control technology anr subjects of the thesis.The second chapter discusses the structure and principles of the system. First pan discusses cable tension control system, begins with system structure and principle: i" whole, and then its constitutes includes hydraulic system and microprocessor control system. Second part discusses jigger tension control system, mainly on its working principles and system structures. Finally the main factors which affects tension centre 1 are discussed.The third chapter analyzes the detect segment. Detect segments of the two sysien^ are both studied. First build up the mathematic module of the able tension control system, analyze its static and dynamic response, testify its stability :md veracity. Second study the detect segment of the jigger tension control system. Finally compare between the two segments are presented.The fourth chapter introduces the simulation and experiments analysis. First study cable tension control system, begins with analysis on its physical environments and the a mathematic module are built up, accordingly static and dynamic response with MATLAB tool is executed to improve system stability and control precision. Fieldworks are performed to solve the demarcation, resort emendation, advanced PID control algorithm and signal interference. Second build up the mathematic module of the jigger tension control system, analyze its control type and emendation methods, perform experiments and draw some conclusions.The fifth chapter gives a brief summarize on electro-hydraulic tension control system and a expectation on future work.更多还原