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变频调速液压控制系统的压力脉动分析
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摘要
本论文针对传统伺服控制系统效率不高、元件寿命短、抗污染能力差、驱动系统效率低、存在流量及压力脉动等缺陷,利用先进的交流变频调速技术改变液压泵转速的容积调速新方法,提出了在液压系统中加一个定差减压阀的新思路,较好地解决了液压伺服系统存在的上述问题。
     第一章,论述了液压调速控制技术的应用和研究动态,提出了将变频调速技术应用于液压控制系统的意义和应用前景,并介绍了本文的主要研究方向和内容。
     第二章,给出了本文的系统结构简图,并对系统各个组成部分作了简要的说明,为进一步分析和研究奠定基础。
     第三章,在分析液压泵流量脉动的基础上,讨论并对比了系统加与不加阻尼两种情况下各自的压力脉动,得出系统中加一个阻尼后,具有一定的滤波作用,但是当流量较大时,由于阻尼的存在,系统功率损失比较严重。
     第四章,给出了系统中加定差减压阀后的结构原理图。对定差减压阀作了简要的介绍,根据系统工作原理图建立静态数学模型进行仿真研究,由仿真结果分析系统静态工作特性,得到静态工作点;然后,建立系统动态模型,对其动态特性进行非线性仿真研究,并就环境因素变化对系统工作特性的影响作了详细分析。
     第五章,给出了考虑变频电机后整个系统的数学模型,对其动态
    
    浙江工业大学硕士学位论文
    特性进行动态仿真,同时就系统各参数对系统工作特性的影响作了仔
    细分析。
    第六章,全文总结与展望。
This paper supplied a new way through variable frequency variable speed (VFVS) to change its output flow rate and adding a constant-pressure-drop valve , which could solve the defects in hydraulic pressure servo control system, such as low efficiency in control system, short life, poor ability in resisting pollution, low efficiency in driving system and flow rate, pressure pulse. And this way was proved to be effective.
    In chapter 1, the application and developing trend of speed control of hydraulic pressure system is discussed. The significance and foreground of applying VFVS technology in the hydraulic pressure system is demonstrated. The content and technical method used in this study is introduced at the end of the chapter.
    In chapter 2, the configuration of the system is presented. Every part of the system is briefly discussed and lay foundation for the proceeding analyzing and studying.
    In chapter 3, the pressure pulse under the two situations of the system with and without damper is discussed at the basic of analyzing the flow rate pulse. Then the conclusion that the system has filtering effect is drew after adding a damper in
    
    
    
    it, but its serious in power wastage because of adding a damper.
    In chapter 4, the principle drawing of the system is presented after adding a constant-pressure-drop valve. The operating principal of the valve is briefly introduced. The static mathematical model is built up and study is carried out by means of simulation under the circumstance of MATLAB, then the static working point is obtained. Based on the nonlinear model, the dynamic characteristic is simulated, by considering the influence of the environmental and geometrical factors, such as oil modulus, chamber volume etc.
    In chapter 5, the dynamic mathematical model of the whole system is constructed considering the influence of VFVS electrical motor. The dynamic characteristic is simulated, by considering the influence of the parameters.
    Chapter 6 is the summarization and prospect.
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