期刊
TRANSACTIONS OF THE INSTITUTE OF MEASUREMENT AND CONTROL
卷 43, 期 2, 页码 325-334出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/0142331220952305
关键词
Sliding mode control; mismatched uncertainties; stability; disturbance observer; robustness
资金
- National Natural Science Foundation of China [61973254]
This paper proposes a fixed-time sliding mode control method for second-order systems with mismatched uncertainties, which introduces a new sliding mode to eliminate the influence of mismatched uncertainties, and ultimately compares its performance with numerical simulation results.
A fixed-time sliding mode control (FTSMC) method is proposed for a second-order system with mismatched uncertainties in this paper. A new sliding mode, which is insensitive to the mismatched disturbance, is present to eliminate the effect of mismatched uncertainties by adopting the differentiable nonlinear function, and to obtain the fixed time stability independent of initial conditions by using the fraction-order function. In order to improve the performance of control system, the extended disturbance-observer-based fixed-time sliding mode control (EDO-FTSMC) approach is investigated to obtain the fixed-time stability subject to the mismatched uncertainties. Finally, the performance of the proposed control method is illustrated to compare other control approaches with numerical simulation results and application examples.
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