Research On Control System Of Motor-driven Load Simulator

Load simulator is an important ground loop simulation equipment, which can simulateaerodynamic load on aircraft. Duing to the enhancement of aircraft agility and controlaccuracy requirement, the higher request of frequency response and loading precision of loadsimulator is put forward. The deeper analysis and research are made and some effectivecontrol methods are put forward.The extra torque in the loading process of load simulator seriously influences the loadprecision and the stability of the system. The model of motor-driven load system is builded byanalyzing the work principle and the basic structure and considering the interference impactof the rudder. The production mechanism of extra torque is analyzed. Feedforwardcompensation structure is designed to eliminate interference effects, The limitations of theconventional compensation method are analyzed,and the improved compensation method ofstructure is proposed to reduce the differential order and the difficulty ofimplementation.System performance will be not guaranteed when the system imprecisionmodel is made, system is influenced by nonlinear factors and parameter changes. Feedforwardcontroller can effectively eliminate the interference of rudder, but can not improve thedynamic performance of loading system; And adaptive control can realize accurate trackingof system, but can not eliminate disturbance well.Aiming at the limitation of the feedforwardcompensation or the adaptive control method separately used for the system, the compositecontrol strategy is proposed to design the control system. The simulation results show that thecomposite control method can effectively eliminate the extra torque, the dynamicperformance of the loading system is greatly improved.