Model deformation measurements are used to measure changes in the shape of an object such as the wings or the rudder of an aircraft or the blades of a helicopter. Another field of application is the model position and attitude deflection caused by aerodynamic loads. DNW also measures model deformation for other lines of industry. For example, measurements were performed of the effects of varying speeds on the sliding roof of a car.
DNW performs its deformation measurements by means of non-intrusive methods and offers a wealth of experience in applying different methods. Thanks to its experience, DNW attains extremely high levels of precision and data quality.
Non-intrusive methods applied in model deformation consist of Stereo Pattern Recognition (SPR) and the Projected Grid Method (PGM).
PGM is used to measure out-of-plane deformation that occurs on objects such as sun roofs of cars. Because measurements are performed at one location, cameras need to be moved and this is time-consuming.
SPR is often applied due to its higher level of precision and the shorter time required for its measurements. It utilizes software to determine the measurement position.
SPR is of special importance in the domain of ground approach with a moving belt. In this case, high-precision position information is essential in preventing the model from touching the ground and incurring damage.