On-line test method of captured trajectory using high-precision aerodynamic model

Abstract

The invention provides an online testing method for capture trajectory using high precision aerodynamic models, comprising of using the online testing flow of capture trajectory of high precision aerodynamic models, the calculation method of the interference amount of the external load of the carrier, the calculation method of the angle of attack induced by the external load, the multi-dimensionalinterpolation method of the aerodynamic force, and the high precision aerodynamic model construction method for the external load. The main features of the online testing method for capture trajectory using high precision aerodynamic models are as follows: when solving the six-degree-of-freedom equation, the aerodynamic force including the influence of the induced angle of attack angle is used toperform the trajectory solution rather than the aerodynamic force directly measured during the testing as to the aerodynamic force of the external load; and the aerodynamic force when the carrier isin the interference minus the aerodynamic force when the external load has no carrier interference. The online testing method for capture trajectory using high precision aerodynamic models effectivelysolves the problem of aerodynamic distortion caused by the movement of the external load relative to the carrier movement during the capture trajectory testing, and greatly improves the accuracy of the capture trajectory testing data.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel tests, and in particular relates to an online capture trajectory test method using a high-precision aerodynamic model. Background technique [0002] The capture trajectory test technology is a special wind tunnel test technology for studying the separation trajectory of the external store from the carrier aircraft. The technical principle is: use the main support mechanism to support the carrier model in the wind tunnel, and the carrier model is fixed during the test to provide a disturbing flow field; use six free mechanisms and six strain balances to support the external store model; the separation initial conditions are given After that, measure the aerodynamic force (CA, CY, CL, CK, Cm, Cn) attached to the carrier aircraft’s disturbance flow field at the initial position of the external store model relative to the carrier model in the wind tunnel; the measured aerodynamic force Converted ...

AI Technical Summary

Problems solved by technology

The movement of the external store relative to the carrier aircraft will bring about the induced angle of attack and sideslip angle, so that the attitude angle of the external store supported by the six-degree-of-freedom mechanism cannot accurately reflect the real angle of attack α and sideslip angle β of the external store ( figure 2 ), figure 2 explains the reason for this distortion

This distortion will have a subversive effect on the trajectory results when the speed of the external store relative to the carrier aircraft is large

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