NASA 1999 SBIR Phase I


PROPOSAL NUMBER 99-1 01.05-2281 (Chron: 992416 )

PROJECT TITLE

On-Line Prediction of Loss of Control Using Wavelets


TECHNICAL ABSTRACT (LIMIT 200 WORDS)

Loss of control in aircraft can result from changes in the controlled element, the control system, the environment, or adverse pilot-vehicle interaction. Each of these paths can be characterized by a loss of phase margin. It is not possible to predict or compensate for all possible sources of additional phase lag in the design process, and so there is a need for on-line health monitoring of the flight control system. The challenge then is to detect the erosion of phase margin in a timely manner and either warn the pilot or automatically take corrective action. In the Phase I effort we intend to use an innovative Time Varying Transfer Function technique to track the phase margin of a time-varying system. These special transfer functions are based on Wavelet Transforms. In contrast to windowed Fourier transforms, these transforms have the ability to analyze a signal at multiple scales, thus allowing for quick response to high frequency changes in the system, without sacrificing low frequency resolution. In Phase I we will develop the methodology and an associated on-line health monitoring toolbox to implement our approach.

Example scenarios and available flight test data will be used to demonstrate feasibility.


POTENTIAL COMMERCIAL APPLICATIONS

This effort will lead to a validated methodology with associated analysis tools and software to predict and analyze loss of control in aircraft in real-time. The immediate commercial application of this technology will be in the development, testing, and safe operation of all aircraft.


NAME AND ADDRESS OF PRINCIPAL INVESTIGATOR (Name, Organization Name, Mail Address,

City/State/Zip)

Vineet Sahasrabudhe, Ph.D.

Systems Technology, Inc.

13766 S. Hawthorne Blvd.

Hawthorne , CA 90250 - 7083


NAME AND ADDRESS OF OFFEROR (Firm Name, Mail Address, City/State/Zip)

Systems Technology, Inc.

13766 S. Hawthorne Blvd.

Hawthorne , CA 90250 - 7083