T型尾翼颤振模型光学测量实验与弯扭特性解算

在FL-26跨声速风洞半模试验段进行了某高速飞机T型尾翼颤振模型的光学测量实验,并依据测量结果解算了尾翼颤振模型的弯扭特性。颤振模型表面用白色圆点进行标记,用于记录模型表面的位移变化,两台固定在风洞试验段上壁板观察孔旁肋板上的400万像素工业相机用来采集图像,采集到的图像通过自主开发的图像解算软件进行图像的识别与求解,计算出尾翼颤振模型表面标记点的三维坐标。模型表面标记点的三维坐标通过坐标变化转换到风洞气流坐标系中,利用不同时刻模型表面坐标的变化计算模型剖面扭角和弹性轴位移的分布。T型尾翼右平尾图像采集实验与弯扭特性计算结果表明,非接触光学测量技术可以用于高速颤振试验的定量分析中。

Optical measurement experiments on T-tails flutter model and bending-torsion characteristics calculation

Optical measurement experiments on T-tails flutter model of a high speed aircraft were carried out in half-model test section in FL-26 transonic wind tunnel,and bending-torsion characteristics of T-tails flutter model were calculated based on measurement results.A number of white dots were painted on surface of flutter model to track displacements of model surface.Two industrial cameras with 4 million pixels were fixed on the rib above the observing hole on the top wall of wind tunnel test section to collect images,and the images were identified and computed by the self-developed software to calculate 3-D coordinates of painted dots on T-tails flutter model surface.The dots＇ 3-D coordinates were changed to coordinates in wind coordinate system by coordinate transformation,and section torsion angle and elastic axis displacement were calculated from the differences between dots＇ coordinates at different time.Image collection experiments on right stabilizer of T-tails and calculation results of bending-torsion characteristics showed that noncontact optical measurement technology could be used in quantitative analysis on high speed flutter tests.