NASA SBIR 2004 Solicitation

FORM B - PROPOSAL SUMMARY


PROPOSAL NUMBER: 04 A1.03-9206
SUBTOPIC TITLE: Technologies for Improved Aviation Security
PROPOSAL TITLE: An Intelligent Hierarchical Approach to Actuator Fault Diagnosis and Accommodation

SMALL BUSINESS CONCERN (Name, E-mail, Mail Address, City/State/Zip, Phone)
Intelligent Automation, Inc.
15400 Calhoun Drive, Suite 400
Rockville, MD 20855-2785
(301)294-5200

PRINCIPAL INVESTIGATOR/PROJECT MANAGER (Name, E-mail, Mail Address, City/State/Zip, Phone)
Xiaodong Zhang
xzhang@i-a-i.com
15400 Calhoun Drive, Suite 400
Rockville, MD 20855-2785
(301)294-5269

TECHNICAL ABSTRACT (LIMIT 200 WORDS)
This proposal presents a novel intelligent hierarchical approach to detection, isolation, and accommodation of primary aerodynamic actuator failures. The proposed architecture has three main components. First, a nonlinear fault diagnosis scheme is used to detect any fault occurrence and to determine the particular fault type. The proposed method can directly deal with nonlinear systems and nonlinear faults, unstructured modeling uncertainty, and new and unanticipated faults. Second, a controller module consists of a primary nominal controller and a secondary adaptive fault tolerant controller. While the nominal controller can be any existing conventional flight control system, the secondary neural network (NN) based adaptive controller is designed to accommodate primary control surface failures by utilizing control redundancy. A pseudo-control hedging method is used to prevent the NN from adapting to various actuation anomalies. Third, a reconfiguration supervisor makes decision regarding controller reconfiguration and control reallocation by using on-line diagnostic information. The proposed architecture is attractive in particular as a retrofit to previously certified flight control systems for improved flight safety. Our primary Phase 1 research objective is feasibility demonstration through extensive simulation studies. In Phase 2, we will refine the algorithms and develop the real-time control software.

POTENTIAL NASA COMMERCIAL APPLICATIONS (LIMIT 100 WORDS)
There are many potential NASA applications for this innovation, for instance, Integrated Vehicle Health Management systems, health monitoring of spacecraft, reusable launch vehicles, propulsion control systems, etc. Other potential applications include NASA systems such as valves, pumps, motors, Main Propulsion System, Thermal Control System, etc. The size of this market is not small and hard to estimate.

POTENTIAL NON-NASA COMMERCIAL APPLICATIONS (LIMIT 100 WORDS)
The proposed approach can be used for applications such as military and commercial aircraft, unmanned aerial vehicles (UAVs), ships, submarines, motors, robots, and nuclear reactors, etc. The proposed fault diagnostics system can be extended to many other applications, such as pumps, gearboxes, motors, engines, etc. The Future Combat System (FCS) program and Joint Strike Fighter (JSF) program are also in significant need of diagnostics and fault-tolerant control technology.