Fuzzy adaptive control for turbofan engines with fixed-time prescribed performance
To deal with the multivariable robust control problem of turbofan engines with a large envelope,a fixed-time prescribed performance fuzzy adaptive control scheme is proposed for the nonlinear turbofan system based on a disturbance observer.Firstly,the equilibrium manifold modeling method was adopted to construct the affine nonlinear turbofan engine model.Through the feedback linearization method,the output tracking error system of the disturbed turbofan engine system was obtained.Then the fuzzy logic system was used to approximate the uncertainty term.A nonlinear disturbance observer was designed to estimate the unknown disturbance and the approximate error.In order to ensure the transient performance and steady-state accuracy of the control system,the fixed-time prescribed performance function was adopted and the system was transformed into an unconstrained error system by the error conversion function.Based on these,a composite nonlinear robust anti-disturbance controller was further developed.Finally,the simulation results indicated that the proposed method can ensure the rotor speed and pressure ratio to effectively track the reference command,and the tracking errors are always limited to the prescribed performance bound.
turbofan enginenonlinear disturbance observerfuzzy logic systemfixed timeprescribed performance function
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