| In aerospace vehicles,linear motion servo mechanisms are widely used.Considering the particularity and complexity of linear motion servo mechanisms under aerospace conditions,it is necessary to conduct ground performance tests.The servo loading test system is usually used in the laboratory to simulate loading and performance testing of the linear motion mechanism.Therefore,in this paper,a set of multi-channel electro-hydraulic servo linear loading test system is designed according to the special working conditions of a linear motion mechanism,and the system is researched so that it can simulate the load of special aerospace working conditions and assess the performance of the linear motion mechanism.First of all,based on the functional requirements and performance indicators of the servo loading system,this paper selects an electro-hydraulic servo loading system with a valvecontrolled cylinder as the actuator through comparative analysis,and designs the overall hydraulic schematic diagram of the system.On this basis,the main components of the system were designed and selected,and the mechanical structure of the test bench of the multi-channel electro-hydraulic servo linear loading test system was designed.The finite element analysis of the key structural parts on the test bench proved the rationality of the designed mechanical structure.The AMESim simulation platform was used to simulate and analyze the hydraulic servo system,and verify the feasibility of the hydraulic servo system.Secondly,the mathematical model of the single-channel electro-hydraulic position servo linear loading system is analyzed and established,and its dynamic characteristics are analyzed.On this basis,the PID controller is used to calibrate the model,so that both channels can meet the requirements for position overshoot ≤ 5% in the performance indicators.At the same time,considering that there are inevitably parameter uncertainties and external load interference in the actual hydraulic system,the Active-Disturbance-Rejection-Controller is used to control the system.Through the co-simulation analysis of AMESim and MATLAB/Simulink,it is verified that the model based on the Active-Disturbance-Rejection-Controller can meet the requirements of repeated positioning accuracy ≤ 0.1mm,which proves the effectiveness and robustness of the controller.Afterwards,three commonly used dual-channel synchronization control strategies are compared and analyzed,and a joint simulation analysis of each synchronization control strategy model based on the active disturbance rejection controller is carried out,which verifies the feasibility of each synchronization control strategy.Among them,the synchronization error of the cross-coupling synchronization control strategy is the smallest.Finally,the measurement and control scheme of the servo loading test system is analyzed and designed,and the hardware selection of the measurement and control system is completed based on this scheme.The design of the measurement and control system software scheme is completed,and the front panel of the host program based on the Lab VIEW development platform and the block diagram of the data acquisition and storage module of the single-channel loading test system are designed. |
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