功率回收式液压泵性能试验系统设计及研究

发布时间：2018-04-26 20:22

本文选题：液压泵试验 + 功率回收　；参考：《中南大学》2011年硕士论文

【摘要】：目前液压元件的性能和可靠性是制约国内液压技术发展的瓶颈,而液压泵是液压系统的核心元件,其性能直接影响整个系统的工作特性,因此搭建对其进行检测且具有良好性能的试验系统至关重要。传统的液压泵性能试验系统基本采用非功率回收方式,即采用耗能元件对液压泵进行加载,将能量全部转化成热能耗散,且需另外增加大规模的冷却系统,试验系统能耗大,试验成本高,几乎不可能实现对大功率液压泵的长时间寿命试验。而功率回收试验系统能将60%以上的能量回收,节能效果显著,装机功率小,布局灵活,因此一直受到人们的关注,应用范围越来越广泛。但由于功率回收式液压泵性能试验系统的研究处于起步阶段,试验系统还存在着诸如提高加载压力调节性能、降低压力脉动、合理匹配系统、提高回收效率、完善系统试验功能等一系列的问题亟待研究解决。因此,本文针对上述问题,以新研制的混凝土输送泵用液压泵为试验对象,设计功率回收式液压泵性能试验系统,并对其性能进行研究,主要工作内容如下： 1.综述了现有液压泵性能试验系统及其特点。根据液压泵试验系统的试验内容和要求,对液压泵的试验系统的类型、工作原理进行分析总结,指出了存在的主要缺陷,并明确了功率回收式液压泵试验系统的工作原理和特性要求。 2.对功率回收式液压泵性能试验系统进行了设计及性能分析。通过理论分析比较了变频调速、马达变量、外部补油三种加载压力调节方式的调节特性,深入研究系统的流量脉动和压力脉动,提出了降低系统压力脉动的方案,设计了功率回收式液压泵性能试验系统,同时对系统的匹配要求和回收效率等性能进行了详细的分析计算。 3.建立仿真模型,对系统的动态性能进行仿真分析。根据功率键合图法建立了系统的功率键合图模型、数学模型和Simulink仿真模型,代入仿真参数,对系统的加载压力的调节特性、压力脉动、冲击试验特性等进行仿真研究。 4.在功率回收式液压泵实验台上,进行加载特性实验,进一步验证了功率回收式液压泵试验系统具有良好的节能效果和试验性能。
[Abstract]:At present, the performance and reliability of hydraulic components are the bottleneck restricting the development of domestic hydraulic technology. The hydraulic pump is the core component of hydraulic system, and its performance directly affects the working characteristics of the whole system. Therefore, it is very important to build a testing system with good performance. The traditional hydraulic pump performance test system basically adopts the non-power recovery method, that is, the energy dissipation element is used to load the hydraulic pump, all the energy is converted into heat energy dissipation, and the large scale cooling system is also needed to increase the energy consumption of the test system. The test cost is high and it is almost impossible to realize the long life test of high power hydraulic pump. But the power recovery test system can recover more than 60% of the energy, the energy-saving effect is remarkable, the installation power is small, the layout is flexible, so it has been paid attention to, and the application scope is more and more extensive. However, since the research of performance test system of power recovery hydraulic pump is still in its infancy, there are still some problems in the test system, such as improving the performance of loading pressure regulation, reducing pressure fluctuation, reasonably matching the system, and improving the recovery efficiency. A series of problems, such as perfecting the system test function, need to be solved urgently. Therefore, in order to solve the above problems, this paper takes the newly developed hydraulic pump for concrete transport pump as the test object, designs the power recovery hydraulic pump performance test system, and studies its performance. The main work is as follows: 1. The existing hydraulic pump performance test system and its characteristics are reviewed. According to the test contents and requirements of hydraulic pump test system, the types and working principles of hydraulic pump test system are analyzed and summarized, and the main defects are pointed out. The working principle and characteristic requirements of the power recovery hydraulic pump test system are also clarified. 2. The performance test system of power recovery hydraulic pump is designed and analyzed. Through the theoretical analysis and comparison of the regulating characteristics of three loading pressure regulation modes, frequency conversion speed regulation, motor variable and external oil filling, the flow pulsation and pressure pulsation of the system are studied in depth, and the scheme to reduce the pressure pulsation of the system is put forward. The performance test system of power recovery hydraulic pump is designed, and the matching requirements and recovery efficiency of the system are analyzed and calculated in detail. 3. The simulation model is established and the dynamic performance of the system is simulated and analyzed. According to the power bond graph method, the power bond graph model, mathematical model and Simulink simulation model of the system are established, and the simulation parameters are substituted in the system. The characteristics of load pressure adjustment, pressure pulsation and impact test are simulated and studied. 4. The load characteristic experiment was carried out on the power recovery hydraulic pump test bench, which further proved that the power recovery hydraulic pump test system has good energy saving effect and test performance.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137.51

【引证文献】