Trajectory prediction method for wind tunnel multi-body separation test model

Abstract

The invention discloses a trajectory prediction method for a wind tunnel multi-body separation test model. According to the prediction method, a Kriging mathematical model of six-component aerodynamic coefficients under different relative positions and postures of a multi-body separation test model is established by using multi-body separation wind tunnel grid force measurement test data, and a motion track is calculated by using a rigid body six-degree-of-freedom motion equation. The separation track is divided into a plurality of moments according to time, the aerodynamic force at the initial moment is predicted according to the mathematical model, the model posture at the next moment is calculated according to the model posture at the initial moment in combination with the motion equation, and the aerodynamic force under the model posture at the next moment continues to be predicted according to the model posture. The process is cyclically executed to obtain a separation track of the multi-body separation test model. The prediction method is simple and efficient, is not limited by the CTS mechanism, solves the problem of trajectory prediction of the multi-body model of the CTS mechanism equipment, avoids the problems and risks of travel, time, collision and the like of the CTS mechanism, 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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