清筛机挖掘装置功率分配研究

Research on Power Allocation of Ballast Cleaning Machine Excavating Device

针对清筛机作业系统存在的功率利用不充分、功率分配不合理的问题,设计了新型作业系统,实现发动机的功率在各作业装置之间动态分配,同时提高挖掘装置的驱动能力。针对功率分配时液压泵马达响应时间差异导致挖掘链转速突变的问题,建立了液压泵变排量机构数学模型,设计了一种基于参考模型模糊自适应PID控制器调节液压泵的比例信号,使泵马达的响应时间一致。在Simulink中建立控制器模型,在AMESim建立变排量机构及挖掘装置液压系统模型,通过AMESim与Simulink联合仿真分析设计的控制器,结果表明设计的控制器能有效降低功率分配时挖掘链转速的突变。

In order to solve the problem of insufficient power utilization and unreasonable power allocation of the ballast cleaning machine operating system,a new operating system is designed to realize the dynamic allocation of engine power among the operating systems,and improve the drive capability of the excavating device at the same time.Aiming at the sudden change of excavating chain speed caused by the difference of response time between pump and motor during power allocation,the mathematic models of pump displacement changing mechanism is constructed,and a fuzzy adaptive PID controller based on reference model is designed to control the proportional signal of the pump to make the pump and motor have the same response time.The analysis of the controller is carried out through the co-simulation of AMESim and Simulink,which the controller model is established in Simulink and the excavating device hydraulic system model is established in AMESim.The result shows that the controller can effectively reduce the sudden change of the excavating chain speed.