双阀控制在电液位置系统中的应用研究

发布时间：2018-07-07 18:14

本文选题：双阀并联系统 + AMEsim与Simulink联合仿真　；参考：《哈尔滨工业大学》2012年硕士论文

【摘要】：双阀控制是指采用两个电液伺服阀，通过合理的控制策略，将两个伺服阀并联使用来实现对系统的控制，以提高整体系统运行性能。本文就阀控缸电液位置伺服系统中提高最低平稳运行速度，并且保证调速范围这一目标，采用两个不同流量级别的国产伺服阀，来替代昂贵的MOOG阀，从而降低系统成本。本文主要从两个角度展开，一方面从理论上分析双阀并联控制系统的可行性与合理性，另一方面寻找合适的控制策略让两个伺服阀性能得到充分的发挥，实现较理想的控制效果。文中从阀控缸系统入手，对其进行了数学建模；接着拓展到课题背景项目，分析导致低速性能无法满足的原因，在此基础上忽略一些次要因素，着重对伺服阀的分辨率参数进行了研究，然后根据分辨率参数的特性，，对其进行了建模，分析了它对系统性能的影响。进而从理论上验证了双阀并联控制对提高系统的低速性能是有效的。如何合理的控制两个伺服阀对于双阀控制系统非常重要。本着追求快速与平稳切换的目的，文中基于模糊控制算法设计了两个控制器，一个用来调节大流量伺服阀的开环增益，一个用来控制大流量伺服阀在整体输出流量中所占的比例。经过与其他几种控制策略的比较，文中设计的控制器具有的适应性强、稳定性好、切换平滑等优点。最后以保持系统总增益不变为原则，设计了定增益控制器，该控制器具有结构简单、系统运行稳定的优点。为了对双阀并联控制系统的理论与思想进行验证，文中采用了AMEsim与Simulink进行联合仿真，以获得更加接近实际的仿真结果。最后利用实验台，对于文中的理论分析与仿真进行了一定程度上的实验论证，并且对双阀并联控制系统性能提升提出了优化意见。
[Abstract]:Double-valve control is to use two electro-hydraulic servo valves, through reasonable control strategy, two servo valves in parallel to achieve the control of the system, in order to improve the overall performance of the system. In this paper, two domestic servo valves of different flow levels are used to replace the expensive mog valve in order to improve the minimum steady running speed and ensure the speed range in the electro-hydraulic position servo system of valve control cylinder, thus reducing the cost of the system. On the one hand, the feasibility and rationality of the double-valve parallel control system are analyzed theoretically, on the other hand, the performance of the two servo valves can be brought into full play by finding the appropriate control strategy. The ideal control effect is realized. Starting with the valve control cylinder system, the mathematical modeling is carried out, and then the background project of the subject is extended to analyze the reasons why the low speed performance can not be satisfied, and on this basis, some secondary factors are ignored. The resolution parameters of the servo valve are studied emphatically, and then, according to the characteristics of the resolution parameters, the model of the servo valve is modeled, and the influence of the resolution parameter on the performance of the system is analyzed. Furthermore, it is proved theoretically that the dual-valve parallel control is effective to improve the low-speed performance of the system. How to control two servo valves reasonably is very important for double valve control system. For the purpose of fast and smooth switching, two controllers are designed based on fuzzy control algorithm. One controller is used to adjust the open-loop gain of large flow servo valve. A large-flow servo valve used to control the proportion of the overall output flow. Compared with other control strategies, the controller designed in this paper has the advantages of strong adaptability, good stability and smooth switching. Finally, a constant gain controller is designed based on the principle that the total gain of the system is not changed into a constant gain controller. The controller has the advantages of simple structure and stable operation of the system. In order to verify the theory and idea of the double-valve parallel control system, AMEsim and Simulink are used to simulate the system. Finally, the theoretical analysis and simulation in this paper are demonstrated to a certain extent by using the experiment bench, and the optimization suggestions for the performance improvement of the double-valve parallel control system are put forward.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137.5

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