负载敏感系统动态特性与节能分析

发布时间：2018-01-14 00:21

本文关键词：负载敏感系统动态特性与节能分析　出处：《燕山大学》2011年硕士论文　论文类型：学位论文

【摘要】：随着能源的日益紧缺和人们对环保要求的不断提高,工程机械的节能性指标越来越受到用户的重视。传统的恒压力、恒功率变量泵在某些应用场合下其功率损失较大,负载敏感式变量泵系统的出现可以很好地解决这个问题。它使用变量柱塞泵,根据负载反馈流量或压力信号,提供给负载所需的功率,因此能够提高发动机的使用效率,尽可能地减少其功率损失。首先,本文对变量泵和工程机械节能技术的国内外发展现状与前景进行了叙述,介绍了课题的研究意义,对定量泵节流调速系统、定量泵LS系统和变量泵LS系统的流量调节原理进行了分析,详述了阀控负载敏感和泵控负载敏感的基本原理,并介绍了负载敏感泵在未来工程机械液压系统中的发展趋势。其次,用AMESim软件中的HCD(hydraulic component design)库对负载敏感变量泵建立了仿真模型,研究负载敏感泵中的LS阀的弹簧刚度大小、有无阻尼孔对系统的影响。本文对这三种液压系统,每种系统泵的出口均有一个节流阀,并为其设定了两种工作状态。一种情况是假设节流阀阀口的开口一定,外负载变化;另一种是让节流阀口变化,给定恒负载,分析液压泵的压力、流量和外负载的压力、流量的匹配情况。最后,依据仿真曲线进行线性计算,对比这三种系统的功率损失和效率,得出负载敏感系统的功率损失最小,得出变量泵LS系统的功率匹配最优,效率最高。该种系统可以极大地提高系统效率,为工程机械节能设计提供参考。
[Abstract]:With the increasing shortage of energy and the increasing demand for environmental protection, the energy saving index of construction machinery is paid more and more attention by users. The traditional constant pressure. The constant power variable pump has a large power loss in some applications. The emergence of load-sensitive variable variable pump system can solve this problem very well. It uses variable piston pump to feedback the flow rate or pressure signal according to the load. It can improve the efficiency of the engine and minimize its power loss by providing the required power to the load. First of all, this paper describes the development and prospects of variable pump and construction machinery energy-saving technology at home and abroad, introduces the significance of the research, quantitative pump throttling speed control system. The flow regulation principle of quantitative pump LS system and variable pump LS system is analyzed, and the basic principles of valve control load sensitivity and pump control load sensitivity are described in detail. The development trend of load sensitive pump in hydraulic system of construction machinery in the future is introduced. Secondly, the simulation model of load sensitive variable pump is established by using HCD(hydraulic component design library in AMESim software. The spring stiffness of LS valve in load sensitive pump and the influence of damping hole on the system are studied. In this paper, there is a throttle valve at the outlet of each pump for these three hydraulic systems. Two working states are set for it. One is to assume that the orifice of throttle valve is certain and the external load changes. The other is to change the throttle orifice and analyze the pressure of the hydraulic pump, the pressure of the flow and the pressure of the external load, and the matching of the flow rate. Finally, according to the simulation curve of linear calculation, comparing the power loss and efficiency of the three systems, it is concluded that the load sensitive system power loss is the least, and the variable pump LS system power matching is optimal. The system can greatly improve the efficiency of the system and provide a reference for the energy-saving design of construction machinery.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137

【相似文献】