Loading...
Please wait, while we are loading the content...
Procedure for estimating stability and control parameters from flight test data by using maximum likelihood methods employing a real-time digital system
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Mayhew, S. C. Bowles, R. L. Grove, R. D. |
| Copyright Year | 1972 |
| Description | A maximum likelihood parameter estimation procedure and program were developed for the extraction of the stability and control derivatives of aircraft from flight test data. Nonlinear six-degree-of-freedom equations describing aircraft dynamics were used to derive sensitivity equations for quasilinearization. The maximum likelihood function with quasilinearization was used to derive the parameter change equations, the covariance matrices for the parameters and measurement noise, and the performance index function. The maximum likelihood estimator was mechanized into an iterative estimation procedure utilizing a real time digital computer and graphic display system. This program was developed for 8 measured state variables and 40 parameters. Test cases were conducted with simulated data for validation of the estimation procedure and program. The program was applied to a V/STOL tilt wing aircraft, a military fighter airplane, and a light single engine airplane. The particular nonlinear equations of motion, derivation of the sensitivity equations, addition of accelerations into the algorithm, operational features of the real time digital system, and test cases are described. |
| File Size | 2260113 |
| Page Count | 58 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19720016975 |
| Archival Resource Key | ark:/13960/t7fr4nd1k |
| Language | English |
| Publisher Date | 1972-05-01 |
| Access Restriction | Open |
| Subject Keyword | Digital Computers Flight Tests Aircraft Stability Computer Graphics Maximum Likelihood Estimates Equations of Motion Linearization 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 |
