PARAMETER IDENTIFICATION OF A MODEL PLANE FROM WIND TUNNEL DATA
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Date
2024-04
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Nazarbayev University School of Engineering and Digital Sciences
Abstract
The study examines parameter identification and identifiability of aircraft model
parameters using a wind tunnel. Initially, a second-order canonical equation was used to perform
identifiability and parameter identification tests in Simulink and MATLAB. In this simulation
part, three different input signals, step, pulse, and 3211 are applied. The results of the
identifiability tests for all three types of input signals showed which parameter can be
determined. Next, the transfer function and least squares methods were used to identify the
parameters in the MATLAB/Simulink program, which determined the exact values of the
parameters. A one degree of freedom aircraft model is tested in a wind tunnel in longitudinal
pitching motion. The aim is to conduct an identifiability test and perform parameter
identification using the transfer function method with MATLAB/Simulink. Step and 3211 input
types were used. The identifiability test showed that the aerodynamic moment derivative with
respect to angle of attack (𝑀 ) has the highest sensitivity, which means it has the highest α
accuracy. Also, sensitivity analysis obtained that other values are within same order of
magnitude, hence the evaluation is possible for these parameters. It means that these parameters
can be identified, but with different accuracy. The parameter identification was conducted
successfully utilizing step and 3211 input signals. It can be highlighted that the result was more
accurate using 3211 input signal. The study effectively identified the parameter of the aircraft
model using theoretical calculations, testing, and sensitivity analysis.
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Citation
Bashkenov, S. (2024). Parameter Identification Of A Model Plane From Wind Tunnel Data. Nazarbayev University School of Engineering and Digital Sciences