System identification of electro-hydraulic actuator system with pressure and load effects

Electro-hydraulic actuator (EHA) system has become one of the most prominent actuator in the past decades. Therefore, it is crucial to attain structural insight into the characteristics of the particular system. This paper presents system identification of EHA system using non-recursive or offline technique where the mathematical model is determined first by considering fixed supply pressure and load. Then, load variation is demonstrated to evaluate the parameter changes. Lastly, supply pressure is changed in order to show the significant effect in the model parameters. The finding shows that the load variation produces insignificant effect in the model parameters due to the limitations of the developed EHA system workbench. However, the supply pressure shows significant effect in the plant model parameters. As conclusion, the robustness and adaptability assessment in the controller design might be appropriately observed in future research works by using the supply variation for the existing EHA system workbench.