Effect of Sampling Rate and Record Length on the Determination of Stability and Control Derivatives
Brenner, Martin J. and Iliff, Kenneth W. and Whitman, Robert K. (1978) Effect of Sampling Rate and Record Length on the Determination of Stability and Control Derivatives. Technical Report NASA TM-72858, Research Engineering, NASA Dryden Flight Research Center.
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Abstract
Flight data from five aircraft were used to assess the effects of sampling rate and record length reductions on estimates of stability and control derivatives produced by a maximum likelihood estimation method. Derivatives could be extracted from flight data with the maximum likelihood estimation method even if there were considerable reductions in sampling rate and/or record length. Small amplitude pulse maneuvers showed greater degradation of the derivative maneuvers than large amplitude pulse maneuvers when these reductions were made. Reducing the sampling rate was found to be more desirable than reducing the record length as a method of lessening the total computation time required without greatly degrading the quality of the estimates. A sampling rate of five to ten samples per second was adequate to obtain reasonably accurate derivative estimates, although higher sampling rates may be needed if digital filtering is required. The less significant control derivative estimates and the lateral-directional rotary derivative estimates were affected the most by reductions in sampling rate and/or record length.
| EPrint Type: | NASA Technical Memorandum |
|---|---|
| Keywords: | Parameter estimation, Record length effects, Sampling effects, Stability and control |
| Subjects: | Aircraft/Project: PA-30 (01 - 09) Aeronautics: (08) Aircraft Stability And Control Aircraft/Project: F-111 Aircraft/Project: C-140 JetStar Aircraft/Project: HL-10 Aircraft/Project: F-15 |
| ID Code: | 703 |
| Deposited On: | 13 Febuary 2006 |
| Additional Information: | 140 pages. |
