Model Deformation Measurement (MDM) at Onera

Abstract

[Abstract] Model Deformation Measurement is becoming a major topic in wind tunnel testing, especially for commercial applications. Onera has developed a solution which is used in several wind tunnels. The system uses two cameras in stereoscopic arrangement and the model shape is measured with markers. The main steps are: camera calibration, initial shape recognition, alignment of the calibration body reference system on the model reference system, wind tunnel testing and post processing. The wing twist uncertainty is lower than 0.05° which is the main requirement. The system can work at is best in real time conditions and can be easily adapted to each test section.