速度敏感控制的闭式液压系统发动机失速问题研究

发布时间：2017-12-31 10:32

本文关键词：速度敏感控制的闭式液压系统发动机失速问题研究　出处：《中南大学》2012年硕士论文　论文类型：学位论文

【摘要】：闭式液压系统有着比开式液压系统传动平稳性好、结构紧凑、能够很好避免换向冲击等优点,在轮式行走机械上得到广泛应用。综观现有轮式机械行走闭式液压系统,其中典型控制方式是液压泵采用DA控制,液压马达采用HA控制,该典型控制方式的闭式液压系统在某种工况条件下会出现发动机失速现象。本文从轮式机械行走系统出发,分析出现发动机失速现象的机理,提出解决发动机失速的方案,并进行相关实验研究。首先,对典型轮式行走系统从运动学、动力学和液压回路等方面进行分析；其次,以典型轮式机械行走闭式液压系统为研究对象,对轮式机械行走系统进行数学建模和仿真分析；应用液压流体力学对行走闭式液压系统进行流量连续性分析,得出变量泵一变量马达行走系统的数学模型。通过AMESim仿真,得出在某种工况下轮式机械行走系统出现发动机失速现象的原因。在此基础之上,提出了解决典型轮式机械行走闭式系统发动机失速的方案,并对其进行仿真；最后,搭建一种轮式机械行走闭式液压系统的试验平台,对提出的方案进行试验。试验结果表明：本文所提出的分流方案能够有效解决发动机失速问题,验证了理论分析和仿真模型正确性。
[Abstract]:The closed hydraulic system has the advantages of better smoothness and compact structure than the open hydraulic system, which can avoid commutative impact and so on. It is widely used in wheeled walking machinery. The typical control mode is that the hydraulic pump is controlled by DA and the hydraulic motor is controlled by HA. The typical closed hydraulic system with control mode will appear engine stall under certain working conditions. This paper analyzes the mechanism of engine stall from wheeled mechanical walking system. The scheme of solving engine stall is put forward, and relevant experimental research is carried out. Firstly, the kinematics, dynamics and hydraulic circuit of typical wheeled walking system are analyzed. Secondly, taking the typical wheeled mechanical walking closed hydraulic system as the research object, the mathematical modeling and simulation analysis of the wheeled mechanical walking system are carried out. Hydraulic fluid dynamics is used to analyze the flow continuity of walking closed hydraulic system, and the mathematical model of variable pump-variable motor walking system is obtained. The simulation is carried out by AMESim. The cause of engine stall in wheeled mechanical walking system under certain working conditions is obtained. On the basis of this, a scheme to solve engine stall in typical wheeled mechanical walking closed system is put forward and simulated. Finally, a test platform of wheeled mechanical walking closed hydraulic system is built to test the proposed scheme. The experimental results show that the proposed shunt scheme can effectively solve the engine stall problem. The correctness of theoretical analysis and simulation model is verified.
【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

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