The Research Of Extraneous Torque Elimination In Electro-hydraulic Load Simulator Of Steering Engine

The electro-hydraulic load simulator of the steering engine is the a loading deviceswhich can be used to do the load torque simulated experiment for fin servos, and it canimitate the air dynamic torque which is the steering engine surface suffered during theaircraft is flying. It to shorting the development cycle, reducing the developed cost ofaerocraft, improving the reliability and development success rates of aircraft haveimportant significance. However, to the load simulator system, the steering engine’sposition movement is an large interference and can produce surplus torque in the loadingprocess. Surplus torque is one of the important factors that affect the electro-hydraulicload simulator of the steering engine’s loading characteristics. Therefore, the researchingabout eliminating the surplus torque of the electro-hydraulic steering engine loadsimulator has important significance.In the first of this paper, we analyze the structure, function, working principle andhydraulic system of a certain type of electro-hydraulic load simulator of the steeringengine, basing on this, we make the optimizing design calculations and choose the suitablemodel for the major component.In the next place, on the basis of considering the main nonlinear factors ofelectro-hydraulic load simulator of the steering engine. We establish the mathematicalmodel of every part respectively, and then analyze about them. In addition, we establishthe nonlinear mathematical model of the electro-hydraulic steering engine load simulator.To the electro-hydraulic steering engine load simulator system, using the velocityfeedback to eliminate the surplus torque is an effective method. Therefore, in this respect,firstly, we have discussed how to bring in the angular velocity’s compensation point, andmake the angular velocity of the steering gear motor as the feedback point to do velocityfeedback, then, basing on the ability that the robust compensator can eliminate the smalldisturbance, we add to the robust compensator to eliminate the surplus torque further, anduse the Matlab to do the simulation under the several different typical working conditions.According to the simulation result, this method is effective for eliminating the Aelectro-hydraulic steering engine load simulator’s surplus torque.At last, in firstly, corresponding simulation working conditions we have made someexperimental measurement about a certain type of electro-hydraulic fin servos loadsimulator’s surplus torque, then we bring in the technology of half a biological simulationsystem’s VV&A, introducing the approach of simulation modeling error in half abiological simulation system and the main technical route of VV&A design. And then onthe basis of comparing the experimental data and the simulation data, using the confidenceinterval method to evaluate and analyze the simulation results, at last, we prove that thesimulation results are accord with the experimental results, they have certain credible.