Characteristic Analysis And Model Updating Technology Of Space Electromechanical Servo System

With the development of global aerospace vehicles toward ‘multielectrification' and ‘all-electrification',electromechanical actuator system has gradually become a new favorite of aerospace vehicle control actuators because of its flexible wiring,no pollution to the environment and high positioning control accuracy.Facing with the new situation of long working hours,drastic changes in environmental factors and wide span of flight airspace of the new generation of aerospace vehicle control actuator,it is of great benefit for designers to accurately predict the performance of products and then carry out physical performance test design to obtain the dynamic performance of aerospace electromechanical actuator system in the preliminary design stage.However,the electromechanical actuator system is a multi-disciplinary complex product involving machinery,energy management,electromagnetism,power electronics,heat and control.It is difficult to analyze and express its dynamic performance.The performance indicators of specific working conditions often need physical tests to verify,which leads to the long development cycle of existing products.In view of the above problems,this paper starts from the development history of aerospace electromechanical servo system,investigates the research status of the characteristics analysis of aerospace electromechanical servo system at home and abroad,and summarizes that to establish a high-precision simulation analysis model of electromechanical servo system characteristics,it needs three methods: accurate virtual real mapping of design parameters and simulation parameters,accurate nonlinear characterization of key parameters and efficient model correction Starting from the aspect of the digital analysis of the characteristics of the aerospace electromechanical servo system,this paper focuses on the modeling of the digital model of the multi-disciplinary and multi domain Aerospace electromechanical servo system,the nonlinear characterization of the key parameters and the accurate calibration of the model,and carries out the research on the characteristics analysis and model verification method of the aerospace electromechanical servo system oriented to the design process,and establishes the aerospace electromechanicalservo system Simulation model of the system characteristics.Taking three evaluation methods of transient,position and frequency as indexes,the mathematical modeling methods of control strategy,permanent magnet synchronous motor,transmission mechanism,drive controller and air rudder are described respectively,and the correctness of the model is verified by taking the product parameters of a project as input.After the establishment of the mathematical model of aerospace electromechanical servo system,in order to verify the accuracy of the model,the control characteristics test of aerospace electromechanical servo system is carried out,the test equipment and test process are introduced,the test of transient,position and frequency characteristics is completed,and the comparison with the simulation data is carried out.It is found that the comparison of speed and current is the line with line fitting rather than the line with traditional error processing Fit between.Taking the key components of aerospace electromechanical servo system motor and transmission mechanism as the research object,this paper analyzes the uncertainty factors of the system,which are mainly the nonlinearity of inductance,the difficulty of calibration of friction parameters and the nonlinearity of stiffness coefficient.Based on the results of comparative analysis of simulation and test,this paper puts forward the model correction method of multi-objective intelligent optimization,and introduces the design experiment in detail Methods,sensitivity analysis method and design of spatial search strategy are introduced in detail.By using the special design experiment method,the design variables are calculated to get the sampling data,and the sensitivity analysis method is used to select the influence degree of the design variables for sorting.Then,using the multi-objective optimization theory and the minimum error as the objective function,the 10 selected key influence parameters are calibrated to verify whether the method used by the author is effective,accurate and Whether it is correct.The dynamic characteristics of the digital Aerospace electromechanical servo system are accurately evaluated and calibrated,and the simulation model of a Aerospace electromechanical servo system product is realized through the comprehensive application of multi-objective optimization algorithm.