NDI-Based L1 Adaptive Control Design for a Generic Hypersonic Vehicle Model

What is it about?

The design of a nonlinear-dynamic-inversion(NDI)-based L1 adaptive controller for a generic hypersonic vehicle model is presented in this paper. Focused attention is paid on dealing with the uncertainty of system input gain and input disturbances, both of which are intrinsic characteristics of the controlled system, and will lead to undesired control performance if not properly addressed in the design phase. The design process starts from the development of the nonlinear dynamic inversion system as the inner-loop controller which achieves linearization between the system inputs and responses. An L1 adaptive control architecture is then designed and augmented to complete the control loop, with the objective of achieving the desired control performance in face of the system uncertainties. Simulation results demonstrate that the proposed control scheme achieves excellent tracking performance in the presence of uncertain input gain and input disturbances. A comparison with traditional PD controller and direct MRAC scheme is also provided, which illustrates the advantages of the proposed architecture. Moreover, a test case study verifies the robustness of the controller to parametric uncertainties.

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