Concepts of photogrammetric of 3D fragment tracking for energy dissipation analyses in impact experiments

Doctoral candidate: Milad Davoudkhani

The project is part of a Research Training Group (GRK 2250/3, part C1) with the goal of enhancing the impact safety of existing building structures and it is funded by the German Research Council (DFG). The focus of part C1 in the 3rd cohort is on Fragment tracking and determination of the motion and shape of fragments for Energy dessipation analysis. Optical 3D measurement techniques serve as powerful tool for spatiotemporal analyses of dynamic processes. They provide the possibility of determining 3D motion vectors or trajectories for a large number of objects simultaneously in a 3D observation space with accuracies in the sub-millimetre range. 

Stereo photogrammetric image acquisition systems consisting of two (or one / rather more) ultra high speed cameras will be employed to observe the motion of Fragments in experiments. An analysis of captured image sequences with the ultra High speed Camera system is conducted to track the Fragments. The key steps are the setup and configuration of cameras and lights as well as the calibration of the camera (whether single or multiple) for ensuring accurate measurements and making decisions about the pattern on the specimen and employing the best method with higher accuracy to achieve the project's goal "Tracking of Fragments for Energy dessipation 3analysis". 

For fragment tracking, the methodology encompasses the determination of translation and rotation of fragments between frames after impact, along with determining their sizes and 3D shapes in experiments as a basis for energy dissipation analyses. 

Link to project webpage: https://www.grk2250.de/