The Hydraulic Servo Rudder Analysis And Control Algorithm Design

The steering gear is the executing agency for the flight control system. Its core is a set ofelectro-hydraulic servo system, Its function is to promote the rudder of the aircraft inaccordance with the control signal coming from the amplifier, to a certain degree of outputspeed and output force. So as to achieve the impact of a complex device for the purpose ofaircraft flight attitude. Modern aircraft are increasingly demanding high performance, thehandling characteristics and aerodynamic characteristics have become more complex, butalso put forward higher requirements for the development of the steering gear.Rudder loop is part of the autopilot, which mainly includes three parts of the controller,hydraulic steering gear and the feedback device. Hydraulic steering gear, includingelectro-hydraulic servo valve actuator. Modern aircraft due to safety and reliabilityrequirements, generally has two operating mode, fly-by-wire mode and mechanicalmanipulation mode. Respectively by electrical and mechanical instruction control valve todrive the actuator to drive the rudder deflection, Feedback device feedback rudderdisplacement complete closed-loop control. The mechanical manipulation modal is anotherimportant means of hydraulic steering gear of the aircraft to work properly, and also tocontrol the aircraft ’s last bulwark.The mechanical manipulation modal, the flat valve and actuator is a key component ofthe steering gear. The modal mechanical manipulation under hydraulic steering gear platevalves, piping and actuator establish a mathematical model. Matlab model simulationanalysis of the plate valve dead load force disputes between the actuator and the outputdisplacement, and proposed the set actuator internal bypass hole to solve the force disputes tothe phenomenon, by the simulation results demonstrate the feasibility of this approach.Fly-by-wire mode, the electro-hydraulic servo valve and actuator are key components inthe rudder circuit performance determines the quality of the entire rudder loop can achieveperformance index requirements. Therefore, the corresponding mathematical model of the electro-hydraulic servo valve and actuator, analyze and study the impact of key structuralparameters, the transfer function of the type of load on valve control actuator simulation ofthe design and the overall performance of the steering gear structure has important theoreticalsignificance. In Matlab model simulation, the simulation analysis of the static and dynamiccharacteristics of the steering gear mode, focusing on the analysis of the electro-hydraulicservo valve dead load force disputes between the actuator and the output displacement.Simulation has played an important role in guiding the design of the steering gear.Fax hydraulic steering gear is a set of electro-hydraulic servo system, to be able to workproperly must have the controller to complete the closed-loop control. A modern technologyof electro-hydraulic servo control technology is a comprehensive hydraulic drive and controltheory, and it is also emerging interdisciplinary. The conversion of electrical and fluid use ofelectro-hydraulic servo valve, the small power electrical signals to control a large load tobecome a reality. This article rudder loop controller based on fuzzy adaptive PID controltheory, the controller has good robustness and anti-interference ability and has good controleffect.