拖拉机悬挂电液提升控制系统的研究

发布时间：2018-04-28 09:59

本文选题：拖拉机 + 悬挂　；参考：《吉林大学》2017年硕士论文

【摘要】：随着科学技术的快速发展以及国民经济水平的提高,我国已成为全球农机装备使用大国和生产大国,对农业机械方面的需求量非常大。但是我国农机研究起步较晚,大部分农机还停留在低端产品的水平,和智能化、信息化、高耕作质量、大功率、驾驶舒适性、节能等高端产品还存在很大的差距,传统的农机性能已经无法满足现在的需求。2016年国家重点研发计划“智能农机装备”重点专项中,将负载传感电液提升器作为其中一项核心技术。拖拉机悬挂电液提升控制系统具有位置控制、力控制、力位综合控制、浮动控制等模式及特殊功能,作业在平原、山地、丘陵等等各种农田,其工况和要求极其复杂,设计适合多种土地类型和工况的悬挂电液提升控制系统对农田耕作的发展将有重大的意义。本文通过机构分析与设计,计算机建模与仿真,实验测试等方法对拖拉机电液提升控制系统进行相应研究。其主要内容如下:1、通过查阅相关国内外文献了解国内的技术发展现状和国外的技术水平之间的差距,掌握了传统悬挂和现代化电液悬挂的区别和相关性能参数及工作原理,设计选定了电液悬挂所需要的功能部件,确定总体研究方案,为建模仿真提供参考依据。2、使用AMEsim建立悬挂液压系统模型,使用Simulink建立各种控制模式的控制模型并验证了各个模型的原理可行性,从控制算法中选出分段非线性、PID、简化的模糊PID三种控制算法并建立相关模型,对比不同控制算法的优劣。3、设计了可以模拟拖拉机工况的拖拉机悬挂试验台,验证了控制算法的可行性。使用现有的元器件简单模拟悬挂液压系统,使用对比试验简单验证不同控制方法的优缺点,并选出了可用方案。
[Abstract]:With the rapid development of science and technology and the improvement of national economic level, China has become a large country in the use of agricultural machinery and equipment in the world, and the demand for agricultural machinery is very large. However, the research on agricultural machinery in China started relatively late, and most agricultural machinery still stay at the level of low-end products, and there is still a big gap between intelligent, information-based, high-quality, high-power, driving comfort, energy-saving and other high-end products. The traditional performance of agricultural machinery can no longer meet the current demand. In the key item of "Intelligent Agricultural Machinery equipment" of the National key R & D Program in 2016, the load sensing electro-hydraulic hoist is one of the core technologies. The electric hydraulic hoisting control system of tractor suspension has the mode and special function of position control, force control, force position comprehensive control, floating control and so on. It operates in plains, mountains, hills and other farmland, and its working conditions and requirements are extremely complex. The design of suspension electro-hydraulic hoisting control system suitable for various land types and working conditions will be of great significance to the development of farmland cultivation. In this paper, the mechanism analysis and design, computer modeling and simulation, experimental testing and other methods are used to study the tractor electro-hydraulic hoisting control system. The main contents are as follows: 1. By consulting relevant domestic and foreign literature to understand the gap between domestic and foreign technological development status and foreign technical level, we have grasped the difference between traditional suspension and modern electro-hydraulic suspension, as well as the relevant performance parameters and working principles. The functional components needed for electro-hydraulic suspension are designed and selected, the overall research scheme is determined, and the reference basis for modeling and simulation is provided. The model of suspension hydraulic system is established by using AMEsim. The control models of various control modes are established by using Simulink and the principle feasibility of each model is verified. The piecewise nonlinear PIDs are selected from the control algorithm, the three control algorithms of fuzzy PID are simplified and the relevant models are established. By comparing the advantages and disadvantages of different control algorithms, a tractor suspension test rig is designed to simulate the tractor working conditions, and the feasibility of the control algorithm is verified. The existing components are used to simulate the suspension hydraulic system. The advantages and disadvantages of different control methods are simply verified by contrast test, and the available schemes are selected.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S219.03

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