Fuzzy Disturbance Observer-Based Fixed-Time Sliding Mode Control for Hypersonic Morphing Vehicles With Uncertainties

This work focuses on the attitude control problem for hypersonic morphing vehicles (HMVs) with uncertainties. A span-morphing HMV model is first established with lumped disturbances. Based on fixed-time technique, a disturbance observer with fuzzy logic system (FLS) is proposed to enhance the robustness by estimating the unmodeled dynamics and external disturbances in fixed settling time. The multivariable fixed-time sliding mode manifold is applied to the transformed control system, which guarantees a direct control input design from attitude command and decent tracking performance. Then, the control system degenerates into an autonomous system, and the closed-loop fixed-time stability is ensured via Lyapunov synthesis and homogeneity theory. Finally, simulation results are presented to demonstrate the effectiveness of the proposed control scheme.

Automated summary

This work focuses on attitude control problem for hypersonic morphing vehicles (HMVs) with uncertainties. A disturbance observer with fuzzy logic system (FLS) is proposed to enhance the robustness. The control system degenerates into an autonomous system, and the closed-loop fixed-time stability is guaranteed via Lyapunov synthesis and homogeneity theory.