飞机液压系统流量负载模拟器的变速积分PI控制

摘要

为了抑制压力波动,对完整飞行剖面下的液压系统工作状态进行分析.针对飞机液压系统提出流量负载模拟器原理,设计新型变速积分PI控制器,建立系统数学模型,确定各参数取值,开展数值仿真和试验研究,指出该流量负载模拟器的优缺点.仿真和试验结果均表明,在完整飞行剖面下,液压系统的可用压力在20.4 MPa以上,液压系统稳定可靠.相比于增量式PI控制器,采用变速积分PI控制器的压力波动至少减小了40%.%The working condition of an aircraft hydraulic system during the full flight phases was analyzed to reduce pressure fluctuation.The principle of flow load simulator was proposed for aircraft hydraulic system and the new variable integral PI controller was brought forward.The mathematic models of flow load simulator system were established and the value of each parameter was defined.Both the numerical simulation and test investigation were conducted, also the pros and cons of the simulator were pointed out.The simulation and test results show that during the full flight phases,the available pressure of an aircraft hydraulic system is always above 20.4 MPa, which means that the flow capacity can meet the demand.The pressure fluctuation amplitude of the system with the developed PI controller is reduced by more than 40% compared to the traditional PI controller.