| The electro-hydraulic loading test-bed of horizontal stabilized surface actuator can simulate the installation form and load condition of water-stabilized surface actuator,test its performance and durability,and then test its fatigue characteristics.In recent years,the research on passive or active electro-hydraulic loading system mainly focuses on the selection of control algorithm.In the aspect of passive loading,the phenomenon of zero-crossing impact exists in tension-compression load switching,and the research on the tracking control of inter-zone force with high load is also relatively few.Modern aircraft is developing towards high load and high flight speed.It is of theoretical significance and engineering application value to study the electro-hydraulic loading test system suitable for the performance index of a new type of horizontal stability surface actuator.A test system is developed to test the load performance and durability of the horizontal stabilized surface actuator,aiming at the larger range of load requirements of the actuator.The design of mechanical structure,hydraulic pressure and electric control system is completed.The control strategy and method of electro-hydraulic loading test system are determined by combining simulation analysis and experimental research,and the control precision of loading hydraulic pressure is achieved.Firstly,the cantilever assembly was designed to simulate the plane horizontal stability surface to meet the requirements of the moment of inertia.The relationship between the output force of the loaded hydraulic cylinder and the bearing force of the specimen was analyzed theoretically.The mechanical strength of cantilever beam was checked by ANSYS,and the electro-hydraulic servo and electro-hydraulic proportional force loading system were designed.Low load range based on servo valve and two-way ball valve,and high load range based on proportional relief valve.Secondly,the mathematical model of electro-hydraulic loading system was established,and the dynamic characteristics of the system were analyzed.The simulation of PID control and iterative learning control was carried out by using MATLAB.It was to be determined that the PID control was used in load performance test and the durability test low load spectrum interval,and the closed-loop P-type iterative learning control was used in the high load spectrum interval of durability test.Finally,the design of the hardware system and the development of the software interface were completed.The electro-hydraulic loading test-bed was built and the related experiments were carried out to verify the correctness of the simulation results.The experimental results show that the electro-hydraulic loading control system designed in this paper can meet the requirements of loading test and has good force tracking characteristics.Especially in durability test,the electro-hydraulic servo loading control system based on PID control can avoid zero load impact,and the electro-hydraulic proportional loading control system based on closed-loop P-type iterative learning control can meet the requirement of loading precision.The test bench can simulate the actual working condition of the horizontal stabilized surface actuator,and has good reliability and practicability. |
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