Adaptive Disturbance-Based High-Order Sliding-Mode Control for Hypersonic-Entry Vehicles

Abstract

In this paper an adaptive, disturbance-based sliding-mode controller for hypersonic entry vehicles is proposed. The scheme is based on high-order sliding-mode theory, and is coupled to an extended sliding-mode observer, able to reconstruct online the disturbances. The result is a numerically-stable control scheme, able to adapt online to reduce the error in presence of multiple uncertainties. The transformation of a highorder sliding-mode technique into an adaptive law by using the extended sliding-mode observer is, together with the multi-input, multi-output formulation for hypersonic entry vehicles, the main contribution of this paper. The robustness is veried with respect to perturbations in terms of initial conditions, atmospheric density variations, as well as mass and aerodynamic uncertainties. Results show that the approach is valid, leading to accurate disturbance reconstruction, to a better transient, and to good tracking performance, improved of about 50% in terms of altitude and range errors with respect to the corresponding standard sliding-mode control approach.

Simulations and flight tests of a new nonlinear controller for the EAGLE lander

“…The use of the saturation function represents a trade-off as the robustness, theoretically ensured by the presence of the sign function, is partially reduced to avoid chattering and get a smoother control action. Note that more advanced techniques, such as the use of high-order SMC 5,9 can be employed to avoid chattering. However, in this phase of development the purpose was to keep the architecture as simple as possible.…”

“…Finally, since the TVC is not able to control the roll, the dedicated roll control, defined in Eq. (9), is integrated in the feedback control law.…”

“…This class of controllers has already been studied for several applications, including longitudinal flight control, 6 asteroid descent guidance 7 and hypersonic atmospheric entry. 8,9 In this work the application of a 6-DOF sliding-mode control technique for EAGLE will be described.…”

Improved Hybrid Fireworks Algorithm‐Based Parameter Optimization in High‐Order Sliding Mode Control of Hypersonic Vehicles

“…As members of sliding mode control methods [3][4][5], high-order sliding mode control (HOSMC) methods [6][7][8] exhibit strong robustness and a reduced chattering effect while dealing with uncertainties. For example, Zhang et al [8] proposed a quasi-continuous HOSMC for HV to effectively alleviate the chattering phenomena.…”

Disturbance attenuation–based sliding mode control with disturbance observer for mismatched uncertain system

“…The first category mainly uses different control strategies to reduce the impact of mismatched uncertainties on the stability of the system, such as linear matrix inequality (LMI)-based approach, 9 the Riccati approach, 10 fuzzy and neural network based control, [11][12][13] adaptive approach, [14][15][16][17] invariant ellipsoid method, 18 and integral SMC approach. [19][20][21][22] The uncertainty of the mismatch uncertainties requires the bounds or vanity of the H2 norm in above methods.…”