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An in-flight aerodynamic coefficient estimation method is proposed for nonlinear lateral motion of reusable launch vehicle via retrospective cost adaptive control theory. The estimated aerodynamic coefficient is then utilized for adaptive controller switch to cope with unexpected polarity change of LCDP(Lateral Control Departure Parameter) online. First, the nonlinear lateral dynamics of a reusable...
A rapid planning algorithm is developed to generate a constrained longitudinal trajectory onboard for reusable launch vehicles (RLVs) in the terminal area energy management (TAEM) phase. The longitudinal trajectory is planned in the flight-path angle vs. altitude space. This flight-path angle profile is designed with required altitude, flight-path angle and range-to-go, and then optimized as a one-parameter...
A new robust disturbance rejection controller scheme integrating a main controller and a compensator for reusable launch vehicle reentry attitude control is proposed. The main controller, using nonlinear dynamic inversion technique, is designed for high performance of the nominal system. The compensator, based on nonlinear extended state observer, built an additional control signal to cancel the disturbance...
An integrated methodology incorporating both nonlinear dynamic inversion and sliding mode control method is employed to design a robust nonlinear controller for reusable launch vehicle reentry attitude control. Stability proof and robustness analysis were conducted. Specific issues related to the torque allocation part for RLV have been discussed. The current controller architecture addresses those...
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