Ahmad Ghorbany - PhD student, Academy Member, Shahin Shahr, Malek Ashtar Technology of University, Engine Research Center, Aerospace Department

A technique for designing optimal inputs for aerodynamic parameter estimation was flight tested on the MIG-29 High Angle of Attack Research Aircraft (HARA). Model parameter accuracies calculated from flight test data were compared on an equal basis for optimal input designs and conventional inputs at the same flight condition. In spite of errors in the a priori input design models and distortions of the input form by the feedback control system, the optimal inputs increased estimated parameter accuracies compared to conventional 3-2-1-1 and doublet inputs. In addition, the tests using optimal input designs demonstrated enhanced design flexibility, allowing the optimal input design technique to use larger input amplitude to achieve further increases in estimated parameter accuracy without departing from the desired flight test condition. This work validated the analysis used to develop the optimal input designs, and demonstrated the feasibility and practical utility of the optimal input design technique.

Aerodynamic -Parameter Estimation- Flight Test - Optimal Input