This paper presents a new control scheme for digital adaptive flight control systems, that satisfies
C* criterion for aircraft which have continuously varying stability derivatives. A number of design methods for digital adaptive flight control systems have been reported based on the assumption that aircraft are linear time-invariant systems. But the equations of real aircraft motions have wide time-varying parameters in their flight envelopes. Only recently, new adaptive control system theories for the linear time-varying systems have been developed. By modifying the new theories, this paper presents a new parameter adjustment algorithm that can estimate the coefficents of powers of dynamic pressure, which are used to synthesize the input to aircraft instead of estimating the time-varying parameters. Computer simulations were performed on a jet fighter as a time-varying system by continuously changing flight conditions in the flight envelope. The results showed remarkable adaptability.
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