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U -Model-Based Finite-Time Control for Nonlinear Valve-Controlled Hydraulic Servosystem

Yan, Hao; Li, Jiafeng; Nouri, Hassan; Xu, Lingling

U -Model-Based Finite-Time Control for Nonlinear Valve-Controlled Hydraulic Servosystem Thumbnail


Hao Yan

Jiafeng Li

Hassan Nouri
Reader in Electrical Power and Energy

Lingling Xu


© 2020 Hao Yan et al. Valve-controlled servosystems are widely used in dynamic tracking, but, not properly studied, nonlinearity, perturbation of internal parameters, and external disturbance have significant impacts on the control performance and challenge in the controller design. This study, with consideration of the finite pressure gain of actual servovalves, proposes a new unified nonlinear model of the valve-controlled servosystem. Based on a U-control platform, this study makes the control strategy design independent from the nonlinear plant, and a virtual nominal plant is presented to eliminate the unmodeled high-frequency characteristics, acquire the desired control performance, and enable the control variable to be explicitly expressed. Then, there follows, designing the U-model-based finite-time control in the valve-controlled systems. Simulation demonstrations show the consistency with theoretical development that the valve-controlled system can smoothly track the command signal within the specified time, and the phase lag is eliminated. Moreover, U-model's application effectively copes with the system chattering, and with the maximum of 1 m/s the dynamic position error caused by discretization of the controller is reduced to less than 0.15%, which can satisfy the demand of general valve-controlled servosystems.

Journal Article Type Article
Publication Date Jan 1, 2020
Journal Mathematical Problems in Engineering
Print ISSN 1024-123X
Electronic ISSN 1563-5147
Publisher Hindawi
Peer Reviewed Peer Reviewed
Volume 2020
Article Number 7083639
Pages 1-12
APA6 Citation Yan, H., Li, J., Nouri, H., & Xu, L. (2020). U -Model-Based Finite-Time Control for Nonlinear Valve-Controlled Hydraulic Servosystem. Mathematical Problems in Engineering, 2020, 1-12.
Keywords General Engineering; General Mathematics


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