A Trajectory Prediction Method for Multi-Body Separation Test Models in Wind Tunnels

Abstract

The invention discloses a trajectory prediction method for a multi-body separation test model in a wind tunnel. The prediction method uses the multi-body separation wind tunnel grid force measurement test data to establish the Kriging mathematical model of the six-component aerodynamic coefficient under different relative positions and attitudes of the multi-body separation test model, and combines the rigid body six-degree-of-freedom motion equation to solve the motion trajectory. Divide the separation trajectory into multiple moments according to time, predict the aerodynamic force at the initial moment according to the mathematical model, solve the model attitude at the next moment according to the model pose at the initial moment combined with the equation of motion, and continue to predict the aerodynamic force at the next moment according to the model attitude The aerodynamic forces in the model attitude. The loop is executed to obtain the separation trajectory of the multi-body separation test model. The prediction method is simple and efficient, and is not limited by the CTS mechanism. It solves the trajectory prediction problem of the multi-body model of the CTS mechanism equipment, avoids the problems and risks of the CTS mechanism travel, time, collision, etc., and reduces the test cost.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel tests, and in particular relates to a model track prediction method for multi-body separation tests in wind tunnels. Background technique [0002] Model trajectory measurement for the design and evaluation of aircraft separation schemes has always been a difficult problem in wind tunnel tests. In the past, the aerodynamic characteristics of the separation body were often obtained through wind tunnel force measurement or grid force measurement test at a fixed model position, and the feasibility of the aircraft separation scheme was evaluated through the analysis of the separation body aerodynamic characteristics. [0003] In recent years, with the advancement of motion machinery and electronic technology, the hypersonic wind tunnel has been equipped with a multi-degree-of-freedom trajectory test capture mechanism (CTS for short). The calculation program calculates the trajectory according to t...

AI Technical Summary

Problems solved by technology

For temporary wind tunnels, the running time of the wind tunnel often cannot meet the requirements of a single trajectory simulation during the test, and the separation distance often cannot meet the simulation requirements due to the structure and size of the test section and the travel limit of the CTS mechanism. The problem of anti-collision between equipment is not easy to solve, once a collision occurs, it will cause great damage to the wind tunnel test equipment

Therefore, limited by the capabilities and risks of current CTS institutions, the CTS trajectory capture test has not been widely applied.

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