This paper presents an application of fractional-order control to industrial electrohydraulics. An optimization based frequency domain approach is used to obtain a fractional-order proportional-integral controller for force control of an electrohydraulic actuator. The controller is designed to have a feature of robustness to gain variations with the step responses exhibiting an iso-damping property. In practice, the gain variations are due to the changes in the environment or the load' force interacting with the actuator. Results of real life experiments demonstrate the effectiveness of the controller.
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