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On-line loss of control detection using wavelets
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Brenner, Martin J. Technical Monitor Rosenthal, Theodore J. Thompson, Peter M. Bachelder, Edward N. Klyde, David H. |
| Copyright Year | 2005 |
| Description | Wavelet transforms are used for on-line detection of aircraft loss of control. Wavelet transforms are compared with Fourier transform methods and shown to more rapidly detect changes in the vehicle dynamics. This faster response is due to a time window that decreases in length as the frequency increases. New wavelets are defined that further decrease the detection time by skewing the shape of the envelope. The wavelets are used for power spectrum and transfer function estimation. Smoothing is used to tradeoff the variance of the estimate with detection time. Wavelets are also used as front-end to the eigensystem reconstruction algorithm. Stability metrics are estimated from the frequency response and models, and it is these metrics that are used for loss of control detection. A Matlab toolbox was developed for post-processing simulation and flight data using the wavelet analysis methods. A subset of these methods was implemented in real time and named the Loss of Control Analysis Tool Set or LOCATS. A manual control experiment was conducted using a hardware-in-the-loop simulator for a large transport aircraft, in which the real time performance of LOCATS was demonstrated. The next step is to use these wavelet analysis tools for flight test support. |
| File Size | 30610504 |
| Page Count | 474 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20050215401 |
| Archival Resource Key | ark:/13960/t38102g5z |
| Language | English |
| Publisher Date | 2005-07-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Stability And Control Flight Tests Flight Safety Fourier Transformation Algorithms Hardware-in-the-loop Simulation Wavelet Analysis Nonlinearity On-line Systems Frequency Response Detection Aircraft Control Real Time Operation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
