Ram, Mohan VS and Srinath Sastry, CV (1986) Non-linear maximum likelihood estimation of stability derivatives from range data. Technical Report. National Aeronautical Laboratory, Bangalore, India.
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Abstract
A parameter identification technique of extracting nondimensional stability derivatives for the AGARD standard ballistic correlation model HB-2 from supersonic free-flight data is investigated. Based on the Maximum Likelihood criterion, the identification technique used is a modified Newton-Raphson quasi-linearization minimization procedure with certain extensions for handling general nonlinear systems without involved program changes. A hybrid type formulation for the 6 degrees of freedom nonlinear equations of motion is employed wherein aerodynamic force and moment representations are in wind-axis and body-axis coordinate systems respectively. Results for both the longitudinal and lateral stability derivatives of the AGARD model demonstrate, as borne out by the excellent fit to the measured motions of a typical flight and accuracy of the parameter estimates, the suitability and power of the maximum likelihood method and functional adequacy of the mathematical model used.
| Item Type: | Proj.Doc/Technical Report (Technical Report) |
|---|---|
| Uncontrolled Keywords: | Equations of motion;Free flight;Kinematics;Mathematical models;Maximum likelihood estimates;Nonlinearity;Parameter identification;Angular momentum;Flight paths;Spline functions;State vectors;Velocity |
| Subjects: | AERONAUTICS > Research and Support Facilities (Air) |
| Division/Department: | Systems Engineering Division, Systems Engineering Division |
| Depositing User: | Mr. Ravikumar R |
| Date Deposited: | 11 Nov 2006 |
| Last Modified: | 24 May 2010 09:53 |
| URI: | http://nal-ir.nal.res.in/id/eprint/3339 |
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