Control of Reusable Hypersonic Launch
Vehicles Funded by AFRL/ AFOSR within the Collaborative Center of Control Science, and by the DAGSI Fellowship Program. |
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Collaborators: Prof. Steve
Yurkovich, ECE, Dr. David Doman, AFRL/VA. |
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Graduate students supported: Jason Parker (PhD Candidate, supported by a NSF Fellowship) David Orn Sightorsson (PhD Candidate) Kevin Groves (Master Candidate, supported by DAGSI). |
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Expected completion of the
project: September 2007. |
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The first topic within the
project regards the design of robust, fault-tolerant control allocation
algorithms for RLVs. The purpose of the control allocation portion of a
guidance and control architecture for reentry vehicles is to distribute
control power among redundant control effectors to meet the desired
control objectives under a set of constraints. We propose the use of
model-based predictive control techniques to deal at the same time with
nonnegligible actuator dynamics, the presence of hard constraints on
the magnitude and rate of the control signals, and the possible
occurrence of faults. Results based on an accurate model of an
experimental reusable launch vehicle are reported in [1], [2], and [3],
while a journal paper is in preparation. The second topic, which is
expected to take a prominent role as the project evolves, regards the
control of airbreathing hypersonic vehicles with integrated
airframe-propulsion systems. The particular shape of vehicles of this
sort, required by the unique characteristics of the propulsion system,
poses severe challenge in the design of guidance and control systems,
due to structural flexibility and strong couplings between the airframe
and the propulsion dynamics. The applicability of design techniques
based on robust control theory which avoid the use of dynamic inversion
is currently under investigation. Preliminary results on control design
for a linearized model are reported in [4].
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Relevant publications:
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