Model identification and active disturbance rejection control for the hydraulic servo actuator in railway suspension systems

This paper investigates the control design of the hydraulic servo actuator in the railway suspension system. The control mechanism of the hydraulic servo actuator is discussed by establishing the formalized nonlinear equations. Based on the experimental data obtained from multi-operating conditions, the model identification of the hydraulic servo actuator is meticulously designed. With support from a numerical actuator model derived from experimental data, rather than relying solely on physical model knowledge, a numerical model-assisted active disturbance rejection control is proposed. In the experiment, the tracking results for the sinusoidal reference signals with various frequencies are presented, which shows the effectiveness of the proposed control design.