Fault Tolerant Optimal Trajectory Generation for Reusable Launch Vehicles (Preprint)
Journal article 1 Jun 2004-18 Dec 2006
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Reconfigurable inner-loop control laws improve the fault tolerance of a vehicle to control effector failures however, in order to preserve stability, the unfailed effectors may be deployed to off-nominal positions to compensate for undesirable perturbations caused by the failed effectors. The effectors acting under the influence of a reconfigurable control law can produce significant perturbations to the nominal forces produced by the wing and body and can also affect the range of flight conditions over which the vehicle can be controlled. Three degree-of-freedom 3 DOF dynamical models used in trajectory optimization for aerospace vehicles typically include wing-body aerodynamic force effects but ignore the aerodynamic forces produced by the control surfaces. In this work, a method for including these trim effects as well as control induced trajectory constraints in a 3 DOF model is presented.
- Spacecraft Trajectories and Reentry