Approach to Identifying Areas of Uncontrolled Oscillations in Human-Machine Systems

In the human-machine system, the human operator, acting as a regulator, controls various devices through servomechanisms. The system parameters and the parameters of the human operator model, to one degree or another, can change due to numerous factors. It can lead to a deviation of the output signal from the specified one or loss of stability, which manifests as oscillatory processes. Usually, drive nonlinearities exert a vast load on the system's stable operation, which requires a thorough analysis of the system and taking this fact into account when designing the control system. In this work, conditions are found under which system performance deteriorates. It manifests itself as a significant increase in performance error or the appearance of unwanted oscillation. A simple method was proposed to prevent them by introducing a nonlinear corrective device into the drive control loop. Also, an analysis of the system on the parameter plane of the forcing signal was proposed by calculating the generalized sensitivity functions.