Model-Based Adaptation for Performance Assured Control of a High-Speed Supercavitating Torpedo

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00014-04-M-0154
Agency Tracking Number: N041-136-1168
Amount: $99,902.00
Phase: Phase I
Program: SBIR
Awards Year: 2004
Solicitation Year: 2004
Solicitation Topic Code: N04-136
Solicitation Number: 2004.1
Small Business Information
1160 Pepsi Place, Suite 300, Charlottesville, VA, 22901
DUNS: 120839477
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Jeffrey Monaco
 Sr. Research Scientist
 (434) 973-1215
Business Contact
 David Ward
Title: President
Phone: (434) 973-1215
Research Institution
Supercavitation is a state in which a gas cavity substantially encompasses a body immersed in a liquid. The consequence for underwater bodies is that drag over the non-wetted surface is drastically reduced, and this can be exploited to develop rapid reaction defensive weapons for submarines. In addition to propulsion and active flow control requirements to initiate and maintain the supercavity, guidance and control systems are needed to provide the agility for close aboard engagements. An adaptive control design is proposed to assure performance for the inherent nonlinear dynamics of the free surface flow, the interactions between flow, cavity, and afterbody, and the diverse launch conditions and terminal states demanded by the problem. A model-based framework is chosen in which neural network characterizations of the nonlinear dynamics are used in an online control design. Parameter identification and provably stable update laws are then added to adapt the models used for control decision to account for plant uncertainties, and lastly, a composite error control approach is incorporated to adaptively cancel unwanted nonlinearities in the responses. Phase I uses a medium fidelity simulation for controller design and a higher fidelity model for evaluation to further demonstrate the benefits of our adaptive control architecture.

* information listed above is at the time of submission.

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