| COMPUTER SCIENCE AND TECHNOLOGY |
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Unsteady aerodynamic identification of aircraft at high angles of attack |
| ZHANG Wanxin, ZHU Jihong |
| Department of Computer Science and Technology, Tsinghua University, Beijing 100084, China |
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Abstract Existing models cannot accurately identify aircraft at high angles of attack due to the unsteady aerodynamic characteristics high angle of attack flight. This paper presents a model using a dynamic block with a static block based on a general aerodynamic derivatives model, which was inspired by the modelling structure of the Wiener model. The model identification is then based on a squared correlation coefficient that estimates the contribution of each model term. The data processing procedure for the parameter estimations is given. Wind tunnel tests with a model similar to an F-22 are used to verify the method. The results show that the method is able to accurately identify the unsteady aerodynamic parameters with a relative error below 5%. The model can effectively describe the unsteady aerodynamic parameters.
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| Keywords
unsteady aerodynamic
high angles of attack
modeling
parameter identification
wind tunnel test
aerodynamic derivative
block oriented
squared correlation coefficient
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Issue Date: 15 July 2017
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2017,
Vol. 57
