Selection of settings of the PID controller by automatic tuning at the control system of the hydraulic fatigue stand

The paper presents a method of automatic tuning of PID controllers for the controlled stress, strain and energy parameter during structural material tests at the hydraulic fatigue stand. Settings of the controllers are determined for the given amplitude and phase margins of the system stability, for some values of the coefficient joining the integral and derivative times. Changes of the controller settings depending on amplitude and frequency of the reference signal have been determined.