Romanian Journal of Information Science and Technology (ROMJIST)

An open – access publication

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ROMJIST is a publication of Romanian Academy,
Section for Information Science and Technology

Editor – in – Chief:
Radu-Emil Precup

Honorary Co-Editors-in-Chief:
Horia-Nicolai Teodorescu
Gheorghe Stefan

Secretariate (office):
Adriana Apostol
Adress for correspondence: romjist@nano-link.net (after 1st of January, 2019)

Founding Editor-in-Chief
(until 10th of February, 2021):
Dan Dascalu

Editing of the printed version: Mihaela Marian (Publishing House of the Romanian Academy, Bucharest)

Technical editor
of the on-line version:
Lucian Milea (University POLITEHNICA of Bucharest)

Sponsor:
• National Institute for R & D
in Microtechnologies
(IMT Bucharest), www.imt.ro

ROMJIST Volume 27, No. 3-4, 2024, pp. 348-361, DOI: 10.59277/ROMJIST.2024.3-4.08
 

Jie WEN and Fangling WANG
Stable Levitation of Single-point Levitation Systems for Maglev Trains by Improved Cascade Control

ABSTRACT: The stable levitation of single-point levitation systems for electromagnetic suspension (EMS) maglev trains, which belongs to the control task of nonlinear and unstable systems, is investigated in this paper. Considering the simplicity and convenience of the control application, we dedicate ourselves to combining and applying common control methods to achieve the stable levitation rather than designing complex controls or using advanced control methods. For this goal, the single-point levitation system is divided into an electromagnetic system and a motion system first. On this basis, we design the Lyapunov controller and sliding mode controller as Controller I, while another Lyapunov controller and the standard Proportional Integral Derivative (PID) controller are designed as Controller II, which are used to control the electromagnetic system and motion system respectively and constitute the improved cascade control to achieve the stable levitation. Furthermore, the switching controller consisting of the standard PID controller and the designed Lyapunov controller is used as Controller II for the improvement of both stability and robustness.

KEYWORDS: Single-point levitation systems; maglev train; sliding mode control; Lyapunov control; cascade control

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