一种风洞中单双目混合的机翼弯扭变形快速测量方法

Single-double mixed stereo vision method for bending and twisting deformation fast measurement in wind tunnel

风洞中飞机模型因承受高速气流冲击等影响,机翼产生动态弯曲和扭转变形,提出了一种单双目混合的快速测量方法,利用荧光标志点对风洞中机翼的弯曲和扭转变形进行测量。首先,提出工况下机翼弯扭变形的布局和计算方案;然后,根据风洞坐标系、飞机模型自身坐标系的关系,建立相机坐标系实现相机自标定;最后,根据已知Y轴向约束的机翼点构建单相机三维重建模型,再计算吹风状态下各截面弯曲和扭转量。通过建立一套专用的机翼变形动态测试系统布局方案,以飞机模型初始位姿作为约束,实现模型动态变形的快速检测,得到的扭转角平均误差为0.228°,可有效解决双目相机难以高帧率实时重建的问题,为优化机身设计参数提供数据支撑。

Due to the impact of high-speed airflow impact under complex operating conditions in the wind tunnel,the wing produces dynamic bending and twisting deformation.This article proposes a fast measurement method that uses a single-double mixed stereo vision method,which can achieve the bending and twisting deformation measurement of the wing in the wind tunnel by using fluorescent markers.Firstly,the layout and computing model of the wing′s bending and twisting deformation is proposed.Then,a camera coordinate system is established to calibrate cameras based on the relative relationship of the wind tunnel coordinate system and the aircraft model′s own coordinate system.Finally,a single camera 3D reconstruction model is constructed according to the wing points with known Y-axial constraints.Therefore,the dynamic bending and twisting deformation can be calculated under blowing condition.This method can realize the fast dynamic measurement of the wing bending and twisting deformation by establishing a special layout of dynamic wing deformation system.Based on the initial position of the aircraft model,the average error of the obtained twisting angle is 0.228°.It can effectively solve the problems of reconstruction with high frame rate in binocular cameras and provide data support for optimizing the design parameters in aircraft.