Structure Analysis And Optimization Design Of The Electro-Hydrostatic Actuator Based On ISIGHT

The future development of aviation is high speed, high pressure and fast response. The aircraft control surface will meet the higher load and faster deflection speed request following the improvement of the aircraft speed and other performance. So the actuator that has bigger power, lower power consumption and lower mass meanwhile meeting the structural strength requirement is needed. As a new type of actuators applied to the plane, Electro-Hydrostatic Actuator (EHA) is getting more and more attention for its small volume, big power and the flexible control ability. At present, the domestic research on aircraft actuator structure design optimization result is not significant; therefore, a basic research is carried out on the problem in this paper.The specific research contents and research results are as follows:(1) At first, the basic theory of structural optimization, the basic principle of mathematical modeling and the basic steps of optimization are introduced. And then the commonly used optimization algorithm is analyzed. The basic principle of genetic algorithm is discussed mainly. Then the advantage of Multi-Island Genetic Algorithm (MIGA) is introduced. Finally the basic knowledge of ISIGHT software and the optimization algorithm embedded are introduced.(2) The structure and principle of EHA are analyzed. Considering the influence factors of control surface rotation of EHA, the EHA system is simplified to reduce the power consumption of EHA. Considering the mechanical and hydraulic disciplines, mathematical modeling of EHA is carried out. The power consumption expression of the electromotor, piston pump and piston rod are deduced. Taking the minimum power consumption of EHA as objective function, while using the initial position and length of connecting rod and the active area of piston rod as design variables, the optimization model is created using ISIGHT software and the optimization results is concluded using MIGA.(3) The problem of structural analysis and optimization of aircraft Electro-Hydrostatic Actuator (EHA) action cylinder is researched in this paper. Using ANSYS finite element analysis software, load, modal shape and compression stability of EHA action cylinder are discussed respectively. Taking the minimum mass and minimum deformation of action cylinder as objective function, while meeting the constraints of stress and modal, the optimization model is created using ISIGHT software. Multi-Island Genetic Algorithm (MIGA), which is embedded in ISIGHT, is used to get optimization results.The problem of structural analysis and optimization of aircraft Electro-Hydrostatic Actuator (EHA) action cylinder is researched in this paper to achieve the minimum power consumption and mass. After the structure optimization, the consumption of EHA decreases38.28%from the previous2166.17J to the latter13368.42J. The mass of the actuator decreases23.5%from the previous17.25kg to the latter13.18. The result shows that using ISIGHT software optimize the structure of EHA can reduce the consumption and mass of EHA effectively.