电液伺服弹簧疲劳试验台的设计与控制研究

发布时间：2018-06-27 07:08

本文选题：疲劳试验台 + 电液伺服系统　；参考：《东北大学》2012年硕士论文

【摘要】：在弹簧性能测试中,电液伺服疲劳试验台是最为常用的设备。电液伺服疲劳试验台的性能主要取决于液压系统和控制系统性能的好坏。电液伺服系统综合了电气和液压两方面的特长,具有控制精度高、响应速度快、输出功率大、信号处理灵活、易于实现各种参量的反馈等优点。本文先从液压伺服系统的设计计算入手,根据试验台长时间连续工作的特点,基于新型电液伺服阀为放大元件设计液压原理。由于系统中存在弹性负载,在负载特性分析时对阀控缸代弹性负载进行了着重分析。采用负载最佳匹配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液压系统的模型。然后,应用MATLAB/Simulink软件对液压系统模型和进行了动态分析与仿真,给出了系统的相关评价参数。然而,随着产品质量对控制品质要求的不断提高,应用常规PID控制,精度和稳定性性不能满足要求。这主要是由电液伺服系统的典型未知不确定性和非线性所决定的,使得系统精确的数学模型难以获得。即使能够建立数学模型,也往往过于复杂,使得基于精确模型的传动控制方法的分析设计和实施变得非常困难。本文设计一种基于遗传算法的模糊控制器,将模糊控制与遗传算法结合起来,弥补了常规凭经验来确定隶属函数的粗糙方法的不足。利用MATLAB语言结合具体实例方便而快速地实现了该控制器的计算机仿真。文中还给出常规PID控制与模糊实验结果,与之相比基于遗传算法的模糊控制提高了系统的动、静态特性,使系统获得了较好的性能。也就是说,该控制方法对于此类系统控制是有效的。
[Abstract]:In the spring performance test, the electro-hydraulic servo fatigue test bench is the most commonly used equipment. The performance of electro-hydraulic servo fatigue test rig mainly depends on the performance of hydraulic system and control system. The electro-hydraulic servo system has the advantages of high control precision, high response speed, high output power, flexible signal processing and easy feedback of various parameters. This paper starts with the design and calculation of hydraulic servo system and designs the hydraulic principle based on the new electro-hydraulic servo valve. Due to the existence of elastic load in the system, the emphasis is put on the analysis of the valve controlled cylinder instead of the elastic load in the analysis of load characteristics. The parameters of hydraulic power elements are determined by the optimal matching of load, and some hydraulic components are selected. The model of hydraulic system is established by the method of transfer function. Then, the dynamic analysis and simulation of hydraulic system model are carried out by MATLAB / Simulink software, and the evaluation parameters of the system are given. However, with the continuous improvement of product quality, the accuracy and stability of conventional pid control can not meet the requirements. This is mainly determined by the typical unknown uncertainty and nonlinearity of the electro-hydraulic servo system, which makes the precise mathematical model of the system difficult to obtain. Even if the mathematical model can be established, it is often too complicated, which makes the analysis, design and implementation of the transmission control method based on the accurate model very difficult. In this paper, a fuzzy controller based on genetic algorithm is designed, which combines fuzzy control with genetic algorithm, and makes up for the lack of rough method of determining membership function based on experience. The computer simulation of the controller is realized conveniently and quickly by using MATLAB language combined with concrete examples. Compared with conventional pid control and fuzzy experimental results, the fuzzy control based on genetic algorithm improves the dynamic and static characteristics of the system and makes the system obtain better performance. That is to say, the control method is effective for this kind of system control.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH87;TH137

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