Application of the Estimation-Before-Modeling (EBM) System Identification Method to the High Angle of Attack/Sideslip Flight of the T-2C jet Trainer Aircraft. Volume 3. Identification of T-2C Aerodynamics Stability and Control Characteristics from Actual Flight Test Data
Abstract
This volume presents the results of the application of the Estimation-Before-Modeling (EBM) System Identification Method to high angle of attack/sideslip flight test data of the T-2C Jet Trainer aircraft. Eighteen maneuvers consisting of over 600 seconds of 20 hertz data are processed. An extended Kalman-Bucy filter/Bryson-Frazier smoother is used in the first step to provide state estimates and measurement biases and scale factors. In the second step of the EBM method, the step-wise multiple linear regression technique and subspace modeling are used to identify detailed models of C sub y, C sub l, C sub n and C sub m. Partial results are given for C sub x and C sub z. The state and control derivatives of the identified model agree well with the wind tunnel model. Most of the identified dynamic derivatives compare well with the theoretically predicted value at low alpha and some compare well at high alpha.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 11, 1979
- Accession Number
- ADA079924
Entities
People
- Harold L. Stalford