On-Line Prediction of Loss of Control Using Wavelets

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: 992416
Amount: $599,991.00
Phase: Phase II
Program: SBIR
Awards Year: 2001
Solitcitation Year: N/A
Solitcitation Topic Code: N/A
Solitcitation Number: N/A
Small Business Information
Systems Technology, Inc.
13766 S. Hawthorne Blvd., Hawthorne, CA, 90250
Duns: N/A
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Vineet Ph.D.
 Staff Engineer, Research
 () -
Business Contact
 Thomas Myers
Title: Vice President
Phone: (310) 679-2281
Email: rwallen@systemstech.com
Research Institution
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.

* information listed above is at the time of submission.

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