Vibration suppression control and anti-eccentric load correction mechanism of magnetic levitation decoupling platform

• Published in: Mechanical systems and signal processing Vol. 225; p. 112314
• Main Authors: Tang, Jinghu, Li, Chaofeng, Zhou, Jin, Wei, Wenpeng, Wu, Zhiwei
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.02.2025
• Subjects: Dynamical decoupling; Feedforward compensation; Magnetic levitation platform; Nonlinear negative stiffness; PSO-LQR control; Vibration suppression control; Feedforward compensation; Magnetic levitation platform; PSO-LQR control; Nonlinear negative stiffness; Dynamical decoupling; Vibration suppression control
• ISSN: 0888-3270
• DOI: 10.1016/j.ymssp.2025.112314

The magnetic levitation system is a typical non-self-stabilizing and strongly nonlinear system, subject to vibration phenomena due to changes in the operating point. This paper proposed combining nonlinear stiffness feedforward compensation control and deviation rectification control (FCC-DRC) to improve the system’s vibration suppression control performance and load resistance. Firstly, using the kinetic decoupling method, the decentralized control of multiple points was decoupled to three degrees of freedom: z, α, and β. Secondly, the nonlinear negative stiffness of the electromagnetic system was counteracted by introducing a feedforward compensation controller (FCC). Then, a deviation rectification controller (DRC) was designed to automatically correct the tilt angle of the platform caused by eccentric load. Finally, the control algorithm is coupled to the electromagnetic system to establish a dynamical coupling model of the magnetic levitation closed-loop system, which verifies that the FCC-DRC can provide α, β-degree-of-freedom control forces while counteracting the nonlinear negative stiffness of the magnetic levitation system. The simulation and experimental results showed that the control system designed in this paper helped to reduce the amplitude of the first-order vibration of the system and effectively suppressed the modal vibration of the magnetic levitation platform. The system achieved offset-free tracking in the z degree of freedom and achieved the effect of vibration suppression. Under the action of load, the vibration period was shortened by 40 %, and the displacement variation in the Z-axis direction decreased by 27 %, indicating the system’s enhanced stability.