泵—马达闭式液压系统压力脉动抑制方法研究

发布时间：2018-03-11 01:11

本文选题：泵-马达　切入点：闭式液压系统　出处：《中南大学》2012年硕士论文　论文类型：学位论文

【摘要】：经过几十年的发展和研究,泵—马达闭式液压驱动技术已能满足多种工况下的使用要求,其工程应用越来越广泛。然而,随着液压技术的发展,人们越来越注重液压系统的品质,对元件的寿命、噪声等都有较高的要求。液压系统压力脉动是降低元件的寿命,引起液压系统噪声和振动的一个主要原因,减少液压系统压力脉动已成为当前的一个研究热点。本文针对泵—马达闭式液压系统工作过程中可能产生的压力脉动机理进行分析,提出有针对性的抑制压力脉动的方法,通过仿真和实验予以验证。主要的研究工作如下： 1.综述了泵—马达闭式液压传动的特点、现状及发展前景；分析了液压系统压力脉动的原因、危害及分类,结合液压系统压力脉动及其抑制方法的研究现状,明确了论文研究的意义。 2.基于泵—马达闭式液压系统的工作原理,分析了可能导致系统压力波动的几个主要因素；根据压力脉动的频率特点,提出了有针对性的抑制系统压力脉动的方法。 3.对柱塞泵和柱塞马达的实际流量脉动进行了理论分析,柱塞单元的实际输出流量脉动主要受到配流盘结构和泄漏的影响；对柱塞泵的流量脉动进行了仿真,结果表明柱塞泵的实际流量脉动远大于理论值,频率也为理论值的2倍；通过仿真研究了柱塞泵和柱塞马达的实际流量脉动对系统压力脉动的影响,验证了利用柱塞泵和马达流量脉动来减少系统压力脉动的可行性。 4.建立了变量泵一定量马达系统的SIMULINK仿真模型,通过仿真验证负载变化时系统的压力变化情况,结果表明：泵的输出流量随着控制电流线性变化,低压侧压力稳定性对系统高压侧压力有一定影响,负载变化会引起系统压力脉动,适当改变系统的一些参数可以减少负载变化引起的压力脉动,并接蓄能器是减少压力脉动的有效措施。 5.搭建泵—马达闭式液压系统实验平台,通过实验验证了利用柱塞单元的实际流量脉动抑制系统压力脉动是可行的；利用工程实例验证了低压侧压力稳定性对高压侧压力的影响,结果表明：确保低压侧压力稳定能有效减少高压侧压力脉动。
[Abstract]:After decades of development and research, the pump-motor closed hydraulic drive technology has been able to meet the requirements of a variety of operating conditions, its engineering applications are more and more extensive. However, with the development of hydraulic technology, People pay more and more attention to the quality of hydraulic system, and have higher requirements for the life and noise of the components. The pressure pulsation of hydraulic system is one of the main reasons for reducing the life of the components and causing the noise and vibration of the hydraulic system. Reducing pressure pulsation in hydraulic system has become a hot research topic at present. In this paper, the mechanism of pressure pulsation that may occur in the working process of pump-motor closed hydraulic system is analyzed, and a targeted method to suppress pressure pulsation is put forward. The main research work is as follows:. 1. The characteristics, present situation and development prospect of pump motor closed hydraulic transmission are summarized, the causes, hazards and classification of pressure pulsation in hydraulic system are analyzed, and the research status of pressure pulsation in hydraulic system and its suppression method are analyzed. The significance of the research is clarified. 2. Based on the working principle of pump-motor closed hydraulic system, several main factors which may lead to pressure fluctuation of the system are analyzed, and according to the frequency characteristics of pressure pulsation, a method to restrain pressure fluctuation of the system is put forward. 3. The actual flow pulsation of plunger pump and plunger motor is theoretically analyzed. The actual output flow pulsation of plunger unit is mainly affected by the structure of distribution disk and leakage, and the flow pulsation of piston pump is simulated. The results show that the actual flow pulsation of the piston pump is far greater than the theoretical value and the frequency is 2 times of the theoretical value, and the effect of the actual flow pulsation of the piston pump and the plunger motor on the pressure pulsation of the system is studied by simulation. The feasibility of reducing system pressure pulsation by piston pump and motor flow pulsation is verified. 4. The SIMULINK simulation model of a certain amount of motor system of variable pump is established, and the pressure variation of the system is verified by simulation. The results show that the output flow of the pump changes linearly with the control current. The stability of low pressure side pressure has certain influence on the high pressure side pressure of the system. The pressure pulsation caused by the change of load can be reduced by changing some parameters of the system properly. Connecting with accumulator is an effective measure to reduce pressure fluctuation. 5. The experimental platform of pump-motor closed hydraulic system is built, and it is proved that it is feasible to restrain pressure pulsation by using the actual flow pulsation of plunger unit. The influence of low pressure lateral pressure stability on high pressure lateral pressure is verified by an engineering example. The results show that ensuring low pressure lateral pressure stability can effectively reduce high pressure lateral pressure fluctuation.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137.51

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