Nonlinear dynamics in the primary flight control system model

In this paper, a mathematical model describing the flap control process of small aircraft is improved. On the basis of the analysis of existing works, the physical groundlessness of the simplification of the model of the process of primary flight control of the aircraft has been proven. An improper simplification was noted when describing the kinematics of the rod-valve system movement. The paper uses a modern approach (Stribek's friction model) to model friction in an electromechanical actuator. The given results of numerical calculations of the movement of the rod-valve system confirm the nonlinear nature of the dynamics of the "rod-valve" system.