机械驱动单钢轮振动压路机液压系统参数匹配研究

发布时间：2018-03-18 17:29

本文选题：机械驱动单钢轮振动压路机　切入点：振动液压系统　出处：《长安大学》2016年硕士论文　论文类型：学位论文

【摘要】：机械驱动单钢轮振动压路机是压路机的主要机型,在我国压路机市场上一直占据主导地位,主要用于基层、次基层的压实作业。振动液压系统作为整机的核心部分直接影响着整机的压实质量、可靠性、作业效率等多个指标,因此对液压系统参数匹配进行研究具有重要的意义。通过对试验样机进行测试发现,液压系统起振过程中存在着严重的压力冲击现象,起振时间较长,功率需求过大,动态过程与平稳工况功率需求差距较大等问题。针对样机现存的问题,本文以理论分析为基础,仿真分析为手段对液压系统进行分析研究。首先对振动系统两种工况进行载荷的分析与计算,找出动态功率需求过大、功率存在较大差距的根本原因,提出了需要理论分析和仿真分析的问题。建立泵排量控制系统和泵—马达系统的数学模型,得出电流控制信号与高压腔压力的关系式,为仿真分析奠定了理论基础。以国产22t样机为研究对象,探讨液压系统参数匹配的原则,从可靠性、使用寿命和系统效率三个方面对参数进行匹配分析并给出合理的匹配区间,并结合试验结果评判样机液压系统参数匹配是否合理。针对起振过程出现的问题,提出了通过改变电流的输入形式实现系统压力和起振时间合理控制的解决方案。将建立的数学模型和simulink软件结合建立液压系统的仿真模型,并依据样机提供的基本参数给定了仿真模型中的参数取值。利用仿真模型分析了不同斜坡信号对系统压力与马达转速的影响,基于理论研究和仿真结果,确定了分段式斜坡信号作为电流输入信号的较优方案,解决样机存在的起振时间较长、冲击压力较大的问题。
[Abstract]:Mechanical driven single steel wheel vibratory roller is the main type of roller. It has been playing a leading role in the market of roller in our country and is mainly used at the base level. As the core part of the whole machine, the vibratory hydraulic system directly affects the compaction quality, reliability, working efficiency and other indexes of the whole machine. Therefore, it is of great significance to study the parameter matching of hydraulic system. By testing the test prototype, it is found that there is a serious phenomenon of pressure shock in the process of starting vibration of hydraulic system, the starting time is longer, and the power demand is too large. The gap between the dynamic process and the power demand of the stationary working condition is large. In view of the existing problems of the prototype, this paper is based on the theoretical analysis. The method of simulation analysis is to analyze and study hydraulic system. Firstly, the load of vibration system is analyzed and calculated, and the root cause of excessive demand for dynamic power and large gap in power is found out. The mathematical models of pump displacement control system and pump-motor system are established, and the relationship between the current control signal and the pressure of high pressure cavity is obtained. This paper discusses the principle of parameter matching of hydraulic system, analyzes the parameters from three aspects of reliability, service life and system efficiency, and gives a reasonable matching interval. Combined with the test results, the parameters matching of the hydraulic system of the prototype is judged. This paper presents a solution to realize reasonable control of system pressure and vibration start time by changing the input form of current. The simulation model of hydraulic system is established by combining the established mathematical model with simulink software. The parameters of the simulation model are given according to the basic parameters provided by the prototype. The effects of different slope signals on the system pressure and motor speed are analyzed by using the simulation model, based on the theoretical research and simulation results. The segmented slope signal is chosen as the optimal scheme of the current input signal to solve the problem of the longer starting time and the larger impact pressure of the prototype.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U415.521

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