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Research on aerodynamic parameter identification technology in wind tunnel free-flight test based on Maximum Likelihood Estimation
Author(s): 
Pages: 8-14
Year: Issue:  5
Journal: Experiments and Measurements in Fluid Mechanics

Keyword:  free-flightwind tunnel testaerodynamic parameter estimationMaximum Likeli-hood Estimation;
Abstract: Using the Maximum Likelihood Estimation method can avoid severe errors of aerodynamic coefficients as a result of direct differentiating the measured data in wind tunnel freeflight test.This paper introduces the rationale and methodology of the aerodynamic parameter identification technology in the wind tunnel free-flight test in detail.Simulation and test examples are presented.The identification results indicate that the aerodynamic parameter identification from wind tunnel free-flight test data is an effective method in study of aerodynamic characteristics of aircrafts.Although force derivatives are hard to identify,moment derivatives are easy to identify and the identification results are close to the engineering results.Meanwhile,the increase of the number of sample points,the improvement of precision of measurements,the installation of overload measuring equipment and the improvement of machining level of test models are all favorable for enhancing the reliabilities of results.
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