ИССЛЕДОВАНИЕ АЛГОРИТМА СНИЖЕНИЯ ВЗАИМОНАГРУЖЕНИЯ ДВУХ ПРИВОДОВ, ОДНОВРЕМЕННО УПРАВЛЯЮЩИХ АЭРОДИНАМИЧЕСКИМ РУЛЕМ МАГИСТРАЛЬНОГО САМОЛЕТА

Abstract

Some civil aircraft assume two actuators simultaneously turning aside the flight control surface(rudder, in some cases aileron or elevator). Thus resulting in onset of the force fighting (mutualloading force). There are several ways to reduce the mutual loading force. One of them is to insertspecific force equalization algorithm in actuators steering. This article deals with effectiveness offorce equalization algorithm as well as its influence on system “2 active actuators - elevator”. Mathematic model of two actuators on elevator has been formed and tested by the developed testing methodthat reproduces the most severe operation conditions. There are several nonlinearities which iscontained in mathematic model: sleeve-travel physical limits, nonlinear effects of fluid foil, rod-travelphysical limits and attachment rigidity. Force equalization algorithm comprises a pressure differentialfeedback loop with PID regulator. The results show that force equalization algorithm is highlyefficient (mutual loading force has been reduced over than 90%) in mode test without external load.However, in test mode with external load it is necessary to introduce a limitation on the magnitude ofthe corrective signal so as decrease the rod drop to level specified in terms of reference. Algorithmhas no effect on stability margin of the system. In conclusion, results of this study could also be usefulto expand the test program for two actuators simultaneously turning aside the flight control surfacesto further simplify the implementation of the force equalization algorithm.