基于限压式变量泵的多执行器液压控制系统的稳定性研究

发布时间：2019-06-09 23:34

【摘要】：随着能源危机的日益临近,节能型产品逐渐进入人们视野后,也越来越受到人们的重视。节能型液压泵作为液压系统的动力源,针对其的研究和研制开发空前繁荣。在此背景下,本课题研究的比例限压式变量泵应运而生。在本文中,对基于限压式变量泵驱动的单泵单执行器系统进行理论分析、系统建模和实验验证。提出对于单泵单执行器系统的稳定性有显著影响的参数,并经过仿真和实验认证。在此基础上,对基于限压式变量泵驱动的单泵多执行器系统进行稳定性分析和仿真,在分析液压回路和限压式变量泵的压力-流量曲线后,提出对于单泵多执行器系统稳定性有显著影响的参数,经过仿真进行验证。本文的主要内容如下:第一章,首先对液压调速回路的概念、多执行器液压系统的分类以及单泵多执行器速度控制的影响因素进行背景介绍。然后对国内外多执行液压系统的研究现状进行介绍。由于本文对限压式变量泵驱动的液压系统的稳定性进行分析讨论,所以在绪论中也对液压系统的振动来源以及国内外对液压系统振动的研究现状进行简要归纳和总结。第二章,在分析单泵单执行器系统稳定性时,对系统进行建模,对系统中的限压式变量泵着重分析稳定性。代入经验数据后,对数学模型进行一定程度上的优化,得到简化后的数学模型,根据伯德图对系统的稳定性进行分析,并得出影响限压式变量泵稳定性的主要参数。第三章,在仿真软件Matlab和AMESim中搭建仿真模型,将理论分析得到的参数代入仿真模型中进行验证,发现仿真现象能验证理论分析。在仿真的基础上,对实物进行改善,将理论分析及仿真验证的参数进行调节,结果该单泵单执行器系统调节稳定,从而验证理论模型和仿真模型。第四章,在单泵单执行器的基础上,对单泵多执行器的系统稳定性进行分析。分别通过液压回路的数学模型和限压式变量泵独特的压力-流量曲线进行分析,得到影响单泵控制多执行器系统的稳定性的主要参数,并在仿真模型中加以验证。并验证前文中影响限压式变量泵驱动的单泵单执行器系统的稳定性的主要参数在单泵多执行器系统中的影响。第五章,全文在工作总结中对本文基于限压式变量泵驱动的单泵单执行器系统和单泵多执行器系统两类的研究内容进行了概括总结,得出了几点关于限压式变量泵控制的液压系统的结论。在文后对将来的进一步潜在工作进行了工作的展望。
[Abstract]:With the approaching of the energy crisis, energy-saving products gradually enter people's field of vision, and more attention has been paid to them. As the power source of hydraulic system, the research and development of energy-saving hydraulic pump is unprecedented. In this context, the proportional pressure-limited variable pump studied in this paper emerges as the times require. In this paper, the single pump single actuator system driven by pressure limiting variable pump is analyzed theoretically, the system modeling and experimental verification are carried out. The parameters which have significant influence on the stability of single pump single actuator system are proposed and verified by simulation and experiment. On this basis, the stability analysis and simulation of the single pump multi-actuator system driven by the pressure limiting variable pump are carried out. After analyzing the pressure-flow curve of the hydraulic circuit and the pressure limiting variable pump, The parameters which have significant influence on the stability of single pump multi-actuator system are verified by simulation. The main contents of this paper are as follows: in the first chapter, the concept of hydraulic speed regulating circuit, the classification of multi-actuator hydraulic system and the influencing factors of speed control of single pump and multi-actuator are introduced. Then the research status of multi-execution hydraulic system at home and abroad is introduced. In this paper, the stability of hydraulic system driven by pressure limiting variable pump is analyzed and discussed, so in the introduction, the vibration source of hydraulic system and the research status of hydraulic system vibration at home and abroad are briefly summarized and summarized. In the second chapter, when analyzing the stability of the single pump single actuator system, the system is modeled, and the stability of the pressure limiting variable pump in the system is analyzed. After replacing the empirical data, the mathematical model is optimized to a certain extent, and the simplified mathematical model is obtained. The stability of the system is analyzed according to Byrd diagram, and the main parameters affecting the stability of the pressure-limited variable pump are obtained. In the third chapter, the simulation model is built in the simulation software Matlab and AMESim, and the parameters obtained from the theoretical analysis are replaced by the simulation model to verify, and it is found that the simulation phenomenon can verify the theoretical analysis. On the basis of simulation, the physical object is improved, and the parameters of theoretical analysis and simulation verification are adjusted. The results show that the single pump single actuator system is stable to verify the theoretical model and simulation model. In the fourth chapter, the system stability of single pump multi-actuator is analyzed on the basis of single pump and single actuator. Through the mathematical model of hydraulic circuit and the unique pressure-flow curve of pressure-limiting variable pump, the main parameters that affect the stability of single pump controlled multi-actuator system are obtained and verified in the simulation model. The influence of the main parameters affecting the stability of the single pump single actuator system driven by the pressure limiting variable pump in the single pump multi-actuator system is verified. In the fifth chapter, in the summary of the work, the research contents of the single pump single actuator system and the single pump multi-actuator system driven by the pressure limiting variable pump are summarized. Some conclusions about the hydraulic system controlled by pressure limiting variable pump are drawn. After this paper, the future potential work is prospected.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH137

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