Estimation of longitudinal aircraft characteristics using parameter identification techniquesThis study compares the results from different parameter identification methods used to determine longitudinal aircraft characteristics from flight data. In general, these comparisons have found that the estimated short-period dynamics (natural frequency, damping, transfer functions) are only weakly affected by the type of identification method, however, the estimated aerodynamic coefficients may be strongly affected by the type of identification method. The estimated values for aerodynamic coefficients were found to depend upon the type of math model and type of test data used with each of the identification methods. The use of fairly complete math models and the use of long data lengths, combining both steady and nonsteady motion, are shown to provide aerodynamic coefficient values that compare favorably with the results from other testing methods such as steady-state flight and full-scale wind-tunnel experiments.
Document ID
19790066419
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Wingrove, R. C. (NASA Ames Research Center Aircraft Guidance and Navigation Branch, Moffett Field, Calif., United States)