In this paper, a control method for a hydraulic loading system of an electromechanical platform\nbased on a fractional-order PID (Proportion-Integration-Differentiation) controller is proposed, which\nis used to drive the loading system of a mechatronic journal test rig. The mathematical model of the\ncontrol system is established according to the principle of the electro-hydraulic system. Considering the\nindetermination of model parameters, the method of parameter identification was used to verify the\nrationality of the theoretical model. In order to improve the control precision of the hydraulic loading\nsystem, the traditional PID controller and fractional-order PID controller are designed by selecting\nappropriate tuning parameters. Their control performances are analyzed in frequency domain and\ntime domain, respectively. The results show that the fractional-order PID controller has better control\neffect. By observing the actual control effect of the fractional-order PID controller on the journal test\nrig, the effectiveness of this control algorithm is verified.
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