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On-line mu method for robust flutter prediction in expanding a safe flight envelope for an aircraft model under flight test
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Brenner, Martin J. |
| Copyright Year | 2001 |
| Description | A structured singular value (mu) analysis method of computing flutter margins has robust stability of a linear aeroelastic model with uncertainty operators (Delta). Flight data is used to update the uncertainty operators to accurately account for errors in the computed model and the observed range of aircraft dynamics of the aircraft under test caused by time-varying aircraft parameters, nonlinearities, and flight anomalies, such as test nonrepeatability. This mu-based approach computes predict flutter margins that are worst case with respect to the modeling uncertainty for use in determining when the aircraft is approaching a flutter condition and defining an expanded safe flight envelope for the aircraft that is accepted with more confidence than traditional methods that do not update the analysis algorithm with flight data by introducing mu as a flutter margin parameter that presents several advantages over tracking damping trends as a measure of a tendency to instability from available flight data. |
| File Size | 2689132 |
| Page Count | 36 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20010054946 |
| Archival Resource Key | ark:/13960/t9q28vp76 |
| Language | English |
| Publisher Date | 2001-04-10 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Stability And Control Flight Tests Patents Flutter Analysis Prediction Analysis Techniques Flight Envelopes Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
