Research Of Electro-Hydrostatic Actuator For Compressor Guide Vane Angle Control

Electrical Hydrostatic Actuator(EHA)is an integrated electro-hydraulic servo system which directly drives the volumetric hydraulic pump from the servo motor to promote the movement of the hydraulic actuator.EHA has significant advantages in compactness,reliability,and maintainability over the traditional electro-hydraulic servo control systems,and is the ideal actuator for multi-electric and all-electric aero-engines.In this paper,the working mechanism,performance characteristics and engineering design method of EHA are studied by using compressor guide vane control as the applying target.Firstly,the hydraulic subsystem and the motor drive subsystem of the EHA are designed and analyzed based on the the requirements of the guide vane angle control.The oil pumps,actuator cylinder and other components of EHA are selected by the calculation of the basic parameters.The mathematical model of the hydraulic subsystem of EHA is established based on AMESim,and the influence of oil pump leakage and load change on EHA driving performance is analyzed.Then based on AMESim and Simulink,a joint simulation model including EHA motor drive subsystem and hydraulic subsystem is established.The position servo control system is constructed based on a PID controller,and the dynamic and static characteristics of EHA are analyzed by comprehensive digital simulation.An EHA test system was designed based on the simulation analysis of EHA system.A hydraulic loading scheme based on energy accumulator is proposed to simulate the position servo control performance of guide vanes under both static and dynamic loading.The EHA test system with loading is built and the preliminary experimental verification is carried out.The experimental results of the position servo control with no-loading and loading both lay the foundation of optimizing the control strategy and developing engineering EHA system.