Development Of An Initial Guidance Comprehensive Force Testing System For A Steering Gear

As the main actuator in missile flight,the performance of electric steering gear largely determines the accuracy and stability of the missile guidance system.The comprehensive test system of electric servo can get the performance of the electric servo in actual working process by testing the load force and the thrust of the jet during the working process of the steering gear,which is of great significance for improving the accuracy during the flight of the missile.This topic comes from the cooperation project with the aerospace institute.The main research purpose is to take the electric servo as the object.First to simulate the load force in the work process,verify the accuracy of the rudder position,and then to test the electric servo static and dynamic jet thrust.Output thrust test mechanism under different working conditions of the electric steering gear is analyzed.By determining the reasonable position of the bearing wall to improve the accuracy of jet thrust test.First of all,according to the various requirements of the guidance integrated test system,the load test and the structural design of the thrust test system are carried out respectively.The main structural design of the test system includes the load stage,static jet thrust test bench and the dynamic jet thrust test bench.Secondly,The unsteady turbulence analysis theory is used to analyze the stress field of each jet field during the jetting process and to simulate the flow field at the turning point of the jet flow field by Fluent software so as to obtain the accurate bearing wall position of the jet thrust test value.After that,the deflection deformation of the force-measuring structure under the influence of impact was studied through Ansys software simulation.Due to the high temperature of the jet itself,the Fluent software is further used to simulate the temperature field.After that,the mechanical properties of the structure under thermal and mechanical loads are compared and analyzed.Based on the comparison simulation results,the better wall structure is determined by optimal design.Finally,in order to verify the rationality of the torsion spring design and the accuracy of simulation value of bearing wall position,the test system design based on Labview softwarewas carried out for load angle measurement,wobble frequency measurement and thrust measurement.Through the load test,the curve of the torque and the rotation angle are obtained.The test data and the design data are compared to verify the rationality of the torsion spring structure design.In the process of thrust measurement,the relationship between the H /D value of the test and the pressure value on the bearing wall is plotted and analyzed to verify the accuracy of the simulation results of the flow field above,which provides an experiment for the improvement and optimization of the subsequent test system reference.