Multidisciplinary Design And Analysis Of Direct-Driving Electro-Hydrostatic Actuator

As the executive element in the automatic control system,the actuator is the basic and general part of complex equipment,and is the priority development theme pointed out in the national medium and long-term scientific and technological development plan.Among them,the electro-hydrostatic actuator(EHA)has the advantages of strong load capacity and high-power density,and is widely used in major equipment fields such as aerospace,aviation,and shipbuilding.With the development of electric motors,electronics,hydraulics,and control technology,the development of electric hydrostatic actuators will expand from major equipment to various fields of industry,which will have a significant impact on the national economy.Mastering the key core technologies for the design and control of electric hydrostatic actuators is of great strategic significance for the development of electro-mechanical-hydraulic integrated servo control technology.EHA is a multi-disciplinary product involving control,electronics,hydraulics,machinery,and multi-field technology.On the basis of the analysis and research of EHA,this subject proposed a direct-driving electro-hydrostatic actuator(DEHA)that combined a linear actuator and a plunger pump as a driving unit,which adopted a high-power density moving coil type.The electromagnetic linear actuator directly drives the plunger pump without a motion conversion mechanism,shortening the power transmission route,and improving work efficiency;used mode FRONTIER and JMAG software combined with MOGT optimization algorithms to optimize the structure size of the electromagnetic linear actuator.A multi-disciplinary simulation model of DEHA was established,and analyzed and optimized its performance.The specific content is as follows:(1)Principle analysis and structure design of DEHA.Based on the research of EHA,a DEHA was proposed,which applied to the shift mechanism of the electric fork-type AMT.DEHA Used high power density moving coil electromagnetic linear actuator combined with plunger pump as the drive unit.Analyzed the design requirements of the electromagnetic direct-drive hydrostatic actuator,and put forward the overall design plan of the system.The working process of the electromagnetic DEHA was explained in detail,and the structure design of its drive unit was carried out.(2)Multi-objective optimization of the structure parameters of the DEHA's drive motor.The electromagnetic field finite element analysis model of the electromagnetic linear actuator was established,and the optimization variables were determined through sensitivity analysis.Based on the mode FRONTIER and JMAG joint optimization platform,using the MOGT multi-objective optimization algorithm,the maximum electromagnetic force of the electromagnetic linear actuator,the electromagnetic force fluctuation rate in the working stroke and the dynamic response time are the optimization objectives,and the structural parameters of the electromagnetic linear actuator components were optimized.According to the optimization results,the electromagnetic linear actuator prototype was trial-produced,and the performance test of the electromagnetic linear actuator was completed.The results show: when the input current is 20 A,the electromagnetic force peak value is 569.7N,and the electromagnetic force fluctuation amount in the entire working stroke is 6.0%.A voltage of 36 V is applied to both ends of the electromagnetic linear actuator,and the electromagnetic linear actuator mover starts from the initial position move to the very end,the time for a stroke of 10 mm is 13.5ms.The accuracy of the electromagnetic linear actuator model and simulation was verified through experiments,which lays a foundation for the establishment of a multidisciplinary model of DEHA.(3)Multidisciplinary modeling and performance analysis of DEHA.Based on the MATLAB/Simulink and AMESim joint simulation platform,a multi-disciplinary simulation model of DEHA was built,and the modeling process of the multi-disciplinary simulation model was explained in detail.Based on the multi-disciplinary simulation model of the DEHA,the influence of the movement of the plunger on the performance of the DEHA was studied,and the positive spin curve was determined as the trajectory of the plunger of the DEHA.The influence of structural parameters was analyzed such as the diameter of the ball seat of the check valve core,the diameter of the valve core ball,the spring rate,and the spring preload on the performance of the DEHA.Under given working conditions,the output characteristics of the DEHA were analyzed.When the trajectory of the plunger is a sine curve with a frequency of 20 Hz and an amplitude of 5mm,the time taken for the actuator cylinder of the DEHA to move 20 mm from the initial position is 0.19 s.(4)Prototype production and performance test verification of DEHA.According to the multi-disciplinary simulation model of DEHA,the dynamic performance of DEHA was taken as the optimization goal,and the structural parameters of the one-way valve in the DEHA were optimized,which improved its dynamic response capability.The DEHA test prototype was designed and manufactured built an DEHA test platform,and introduced the structure and principle of the experimental platform in detail.Through tests under typical working conditions,the accuracy of the design and optimization scheme of the DEHA was verified.The performance of the DEHAmeets the driving requirements of the electric fork-type AMT.