%0 Journal Article
%T Feedforward model
%A Hyouk Ryeol Choi
%A Hyungpil Moon
%A Ja Choon Koo
%A Kyeong Ha Lee
%A Sang-Hoon Ji
%A Seung Guk Baek
%J Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
%@ 2041-2983
%D 2019
%R 10.1177/0954406218786533
%X Three-stage servo-valves are popularly used in hydraulic systems that require large flow rate and high pressure. For a proper control of flow direction and flow rate fed into a hydraulic actuator, securing a proper position control bandwidth is a critical task for the servo-valve. In this paper, a set of popular control methods are systematically studied and a control method is selected. It is proven that the feedforward model-inverse control is the most effective method in terms of the control bandwidth. In the present work, the feedforward closed-loop architecture is adopted and the closed-loop system is estimated in a linear discrete-time transfer function by recursive least squares method. On recognizing a nonminimum phase zero problem, this work implements the zero magnitude error tracking control, an approximate model-inverse technique, in order to overcome the problem. As a result, the effectiveness of the proposed feedforward model-inverse position control strategy is verified
%K Three-stage servo-valve
%K position control
%K approximate model-inverse
%U https://journals.sagepub.com/doi/full/10.1177/0954406218786533