精校机电液位置伺服系统的研究
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摘要
精密校直液压机(精校机)液压伺服系统是精校机的执行环节,是保证工件加工精度的关键。本文对液压伺服系统的基本理论作了进一步的探讨。并将现代控制理论、自适应控制理论与电液伺服控制理论相结合,对精校机电液位置伺服系统进行了全面系统的研究。主要研究内容如下:
     1.根据液压伺服系统的基本理论,对四通阀控单出杆液压缸的数学模型进行了深入研究,推导了四通阀控单出杆液压缸的传递函数,并对其动态特性进行了分析。
     2.运用传递函数法,对不同负载时精校机电液位置伺服系统进行了研究。在建立精校机电液位置伺服系统数学模型的基础上,当负载为外负载力时,研究了系统参数对系统性能的影响,提出一些改善系统性能的方法。当负载为弹性负载时,研究负载刚度的变化对系统性能的影响和负载刚度与放大器增益的关系,提出了一种动态调节放大器增益以改善系统性能的方法。对计算机控制的精校机电液位置伺服系统,建立相应的离散数学模型,并对系统参数的选取和系统性能进行了研究。
     3.研制了精校机电液位置伺服系统的实验系统,并在不同负载情况下对精校机电液位置伺服系统进行了实验研究。
     4.将现代控制理论应用于电液位置伺服系统,建立精校机电液位置伺服系统的状态空间模型,提出了基于状态空间的最优二次型控制和渐近跟踪控制。
     5.将自适应控制理论应用于电液位置伺服系统,提出了基于增益和阻尼比调节的自适应控制、基于参数辨识的渐近跟踪自适应控制、极点配置的自校正控制和广义预测的自适应控制。
     本文的研究内容为成功开发国产自动精密校直液压机提供了理论支持。
The hydraulic-servo system of the precise straightening press is the executive body and is the key unit to ensure the processing precision of the workpiece. In this dissertation, the basic theory of hydraulic-servo system is explored further more, the electro-hydraulic position servo system of the precise straightening press is researched entirely, combined the theory of modern control and the theory of adaptive control with the theory of electro-hydraulic servo control. The main contents are as following:
    1.According to the basic theory of hydraulic-servo system, research deeply the mathematical modal of four-connection valve-controlled hydraulic cylinder, built up the transfer function of four-connection valve-controlled hydraulic cylinder and analyze it's dynamic character.
    2.Research the electro-hydraulic position servo system of the precise straightening press under different load by applying the method of transfer function. Firstly establish it mathematical modal, research the affect of the system character by the system parameter and bring forward the method improving system character when the load is outside power. Then research the affect of the system character by the different load stiffness and the relation between load stiffness and the amplifier gain, bring forward a method of adjusting the amplifier gain dynamic to improve the system character. Lastly based on establishing it discrete mathematical modal, research the system character and the choose of system parameter on the electro-hydraulic position servo system of the precise straightening press controlled by compute.
    3.Develop the experiment system of the electro-hydraulic position servo system of the precise straightening press and the experiment research is carried on by the different load.
    4.Establish it state space modal by applying the theory of modern control to electro-hydraulic position servo system, and bring forward the method of quadratic optimal control and approach track optimal control.
    5.Applying the theory of adaptive control to electro-hydraulic position servo system, bring forward a adaptive control method based on regulating gain and damp, a adaptive control method of approach track based on parameter identification, a self-tuning control method of pole placement, a adaptive control method of general predictive.
    
    
    
    The research contents in the dissertation provide the theory support in developing state-produced automatic straightening press.
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