Spatio-Temporal Optical Flow Methods for Process Analysis
Block matching algorithms (DIC), used in experimental mechanics and full-field process analysis, reach their limits in resolving complex, discontinuous, and multi-scale deformation patterns, are error-prone under industrial operating conditions, or fail when calculating spatio-temporal derivatives. However, motion and its spatio-temporal derivatives lay the foundation of modeling physical processes. This thesis pursues a fundamentally different approach, based on the calculus of variations – the optical flow methods. Newly designed regulariza-tions together with a novel framework for hyperparameter determination enable robust estimation of motion, its spatio-temporal derivatives, and discontinuities. The proposed methods allow analyzing strain, strain rate, and crack propagation during different shear cutting processes using high-speed imaging on a developed precision shear cutting tool.
| Autor: | Hartmann, Christoph |
|---|---|
| ISBN: | 9783958840669 |
| Auflage: | 1 |
| Sprache: | Englisch |
| Seitenzahl: | 227 |
| Produktart: | Kartoniert / Broschiert |
| Verlag: | TUM.University Press |
| Veröffentlicht: | 22.09.2021 |
| Schlagworte: | Lehrstuhl für Umformtechnik und Gießereiwesen TU München crack propagation high-speed camera higher-order derivatives shear cutting steel strain rate variational method |