- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | JING Yongzhi, FENG Wei, WANG Sen, MA Xianchao, HAO Jianhua, DONG Jinwen. Levitation Control Strategy Based on Adaptive Non-singular Terminal Sliding Mode[J]. Journal of Southwest Jiaotong University, 2022, 57(3): 566-573. doi: 10.3969/j.issn.0258-2724.20210743
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Aiming at the problems of slow response speed and poor anti-interference ability of the traditional linear sliding mode control (LSMC) for electromagnetic levitation systems, a levitation control method based on adaptive non-singular terminal sliding mode control (ANTSMC) is proposed. The proposed method introduces an adaptive controller into the terminal sliding mode control (TSMC) to take its advantage of insensitivity to disturbance in sliding mode control. The convergence law coefficients in the sliding mode control are adjusted on line by adaptive control to improve the dynamic performance of the levitation system. First, a mathematical model of the electromagnetic levitation system is established. Then the stability of the designed controller is proved by Lyapunov stability theory. Finally, simulation and experimental verification are carried out. Experimental results show that the system with ANTSMC has a faster response speed and a smaller steady-state error in signal tracking. For sinusoidal or sawtooth interference with peak to peak value of 2 N, air gap fluctuations can be limited to 0.2 mm. The air gap fluctuates 0.6 mm during the 0.1 kg loading and unloading experiments. Generally the proposed levitation controller based on ANTSMC has better performance than those based on TSMC and LSMC.
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