风洞模型变形单相机测量误差分析与补偿算法

doi:10.7527/S1000-6893.2014.0298

Abstract

Abstract:

Expressions of coordinates' calculation errors in object space induced by the hypothesis that spanwise coordinate is constant in single-camera model deformation measurement experiments, are derived from the collinearity equations describing the relationship between 2D coordinates in image plane and 3D coordinates in object space. Then the effect of fixing camera at different positions on coordinates' calculation errors is analyzed for a 2 m scale wind tunnel test section. A spanwise displacement compensation algorithm is presented based on the nearly rigid section characteristics of high respect-ratio wind tunnel model in elastic deformation, to reduce or eliminate the coordinates' calculation errors induced by the hypothesis of constant spanwise coordinate. Finally, the compensation algorithm for spanwise displacement is evaluated by a numerical simulation method. The data results show that the compensation algorithm can give relatively exact spanwise displacement and bound the coordinates' calculation errors in a reasonable range when there is singularity of R_X/R_Y or R_Z/R_Y and large errors of space coordinates calculation results need modification.

Key words: wind tunnel, model deformation measurement, single-camera, error, compensation algorithm

CLC Number:

V211.71

SUN Yan. Error analysis of single-camera model deformation measurement in wind tunnel and compensation algorithm[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(7): 2115-2124.

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Error analysis of single-camera model deformation measurement in wind tunnel and compensation algorithm

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