Observer-free fixed-time fault-tolerant control for near-space hypersonic vehicles with unknown actuator faults and mismatched disturbances

文献类型： 外文期刊

第一作者： Wang, Yujia

作者： Wang, Yujia;Wang, Yujia;Dong, Jinlu;Wang, Muyuan;Wang, Muyuan;Wu, Wenqi

作者机构：

关键词： Actuator faults; Mismatched disturbances; Observer-free; Fault-tolerant control

期刊名称：AEROSPACE SCIENCE AND TECHNOLOGY （ 影响因子：5.8； 五年影响因子：5.6 ）

ISSN： 1270-9638

年卷期： 2025 年 165 卷

页码：

收录情况： SCI

摘要： This paper presents an innovative observer-free sliding mode control strategy to address the challenging tracking control problem of near-space hypersonic vehicles with unknown actuator faults, mismatched disturbances, and matched disturbances. Unlike traditional fault-tolerant control methods, this approach eliminates the need for observers and precise information about faults and disturbances, simplifying implementation while ensuring robust performance. The study begins by constructing a rigid-body dynamics model for near-space hypersonic vehicles. By introducing indirect variables, the under-actuated system is transformed into a fully actuated one, enabling tracking control design. Subsequently, a novel sliding mode surface is proposed, followed by the design of a sliding mode controller to achieve reliable tracking performance in the presence of uncertainties and actuator faults. Numerical simulations validate the effectiveness of the proposed method by comparing it with stateof-the-art methods, such as fixed sliding mode control, logarithmic sliding mode control, and fractional-order sliding mode control, demonstrating performance improvements, with reductions in integral of squared error, integral of absolute error, and time-weighted integral of absolute error ranging from 7.55% to 97.99%, even under mismatched disturbances and actuator faults. These results show its potential for improving fault-tolerant control of near-space hypersonic vehicles.

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