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Input design for identification of aircraft stability and control derivatives
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hall Jr., W. E. Gupta, N. K. |
| Copyright Year | 1975 |
| Description | An approach for designing inputs to identify stability and control derivatives from flight test data is presented. This approach is based on finding inputs which provide the maximum possible accuracy of derivative estimates. Two techniques of input specification are implemented for this objective - a time domain technique and a frequency domain technique. The time domain technique gives the control input time history and can be used for any allowable duration of test maneuver, including those where data lengths can only be of short duration. The frequency domain technique specifies the input frequency spectrum, and is best applied for tests where extended data lengths, much longer than the time constants of the modes of interest, are possible. These technqiues are used to design inputs to identify parameters in longitudinal and lateral linear models of conventional aircraft. The constraints of aircraft response limits, such as on structural loads, are realized indirectly through a total energy constraint on the input. Tests with simulated data and theoretical predictions show that the new approaches give input signals which can provide more accurate parameter estimates than can conventional inputs of the same total energy. Results obtained indicate that the approach has been brought to the point where it should be used on flight tests for further evaluation. |
| File Size | 4160930 |
| Page Count | 142 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19750009298 |
| Archival Resource Key | ark:/13960/t9t19sb4d |
| Language | English |
| Publisher Date | 1975-02-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Stability And Control Flight Tests Stress Analysis Data Acquisition Data Processing Aircraft Design Aerodynamic Stability Flight Control Stability Derivatives Aerodynamic Loads Aircraft Control 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 |
