Method for determining aerodynamic parameters of model free flight tests

Abstract

A method for determining aerodynamic parameters of model free flight tests is used in model free flight tests including a wind tunnel free flight test, an atmospheric free flight test and the like. Under the situation that a model used in wind tunnel free flight or atmospheric free flight moves in a plane, the method of polynomial time is adopted to match the linear displacement of the centroid of the model in the horizontal direction and the vertical direction and the shooting recording observing value, changing along with time, of the angle of pitch of the model, then, the time-dependent changing rule of the linear displacement, the linear velocity and the linear acceleration of the centroid of the model and the angle displacement, the angle velocity and the angle acceleration of the angle of pitch is obtained, and accordingly the time-dependent changing rule of the resistance coefficient, the lift coefficient and the pitch moment coefficient in the process of model flying is obtained. The application conditions and the range of a data processing method of the model free flight tests are expanded, and the test recorded data can be processed in wide application conditions and ranges to obtain the aerodynamic parameters and the movement rule of the model.

Description

technical field [0001] The invention provides a method for determining aerodynamic parameters of a model free flight test, which is applied to the determination of aerodynamic parameters of a model free flight test under the condition of plane motion, and the applicable scope includes wind tunnel free flight and atmospheric free flight tests and the like. Background technique [0002] In the case of plane movement, the data recorded in the free flight test of the model is the displacement of the center of mass of the model and the displacement of the pitch angle—time observation value {x i ,t i} i=1,2,…N , {y i ,t i} i=1,2,…N and {θ i ,t i} i=1,2,…N , usually using the single-degree-of-freedom form of the parameter differential method or the three-period method, and the relationship between the lift and drag coefficients and the angle of attack to carry out parameter identification on the recorded data, so as to obtain the aerodynamic parameters such as the lift, drag...

AI Technical Summary

Problems solved by technology

[0003] The problem solved by the technology of the present invention is: to overcome the deficiencies of the prior art, to provide a method for determining the aerodynamic parameters of the model free flight test, to make up for the deficiencies of the existing model free flight test aerodynamic parameter identification technology, and to solve the problem in the case of plane movement. In the model free flight test, the aerodynamic law and mode of the aircraft are not clear, so that the commonly used parameter differential method, three-period method, and lift-drag coefficient identification method cannot be applied, how to determine the aerodynamic parameters

Images