【作者】 刘治宇；

【导师】 周恩涛；

【作者基本信息】 东北大学 ， 机械电子工程， 2008， 硕士

【摘要】 随着制造业的不断发展,对锻造机械和锻造附属设备提出了越来越高的要求。锻造操作机性能的好坏将直接影响锻造效率与锻件的生产质量。本文对锻造操作机夹钳升降液压系统进行了计算、分析与研究。为了提高液压系统的快速性、准确性与稳定性,夹钳升降液压系统采用了伺服阀控制非对称液压缸,符合现场的工况要求。本论文采用负载最佳匹配原则确定液压动力元件的参数,对部分液压元件进行了选型,采用传递函数的方法建立了夹钳升降液压系统的模型。然后,应用MATLAB/Simulink软件对夹钳前升降液压系统模型和夹钳后升降液压系统模型分别进行了动态分析与仿真,给出了系统的相关评价参数。本文在详细了解控制理论相关知识的基础上,对系统采取了模拟PID控制器校正和模糊自适应整定PID控制器校正,改进了系统的动态特性,取得了较好的控制效果,达到了工程上的使用要求。通过两种控制器的对比,可以看出模糊自适应整定PID控制具有控制灵活,自适应性强,控制精度高,稳定性好等特点,其控制效果优于模拟PID控制器,进一步实现了系统的优化。更多还原

【Abstract】 As the developing of the manufacturing industry, more and more requests are set to the forging machines and their accessory equipments.This paper does calculation,analysis and research about the forging manipulation.In order to improve the rapidity, the accuracy and the stability of the hydraulic system,the asymmetrical cylinders controlled by sevo-valves are applied to lifting hydraulic system of the clamp.This project conforms to the request of actual operating mode.This paper calculates the hydraulic pressure power parts’ parameters according to the load optimum matching,selects the hydraulic elements’models and builds the models of the clamp’s litfing hydraulic system by using the transfer functions.Then the paper does the dynamic analysis and simulation about the lifting hydraulic system and gives the related evaluation parameters.On the basis of knowing the control theory seriously,this paper apply the correction of analog pid controller and fuzzy self adaptive pid controller.This project improves system’s dynamic characteristic,obtains better effects and achieves better request in engineer.Compared to analog pid controller the fuzzy self adaptive pid controller has the characteristics of flexible control,strong self adaption,high control precision and good stability.The control effects of fuzzy self adaptive pid congtroller are better than analog pid’s.So the fuzzy self adaptive pid contreller optimizes the system further.更多还原