07 Fakultät Konstruktions-, Produktions- und Fahrzeugtechnik
Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/8
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Item Open Access A family of total Lagrangian Petrov-Galerkin Cosserat rod finite element formulations(2023) Eugster, Simon R.; Harsch, JonasThe standard in rod finite element formulations is the Bubnov-Galerkin projection method, where the test functions arise from a consistent variation of the ansatz functions. This approach becomes increasingly complex when highly nonlinear ansatz functions are chosen to approximate the rod's centerline and cross-section orientations. Using a Petrov-Galerkin projection method, we propose a whole family of rod finite element formulations where the nodal generalized virtual displacements and generalized velocities are interpolated instead of using the consistent variations and time derivatives of the ansatz functions. This approach leads to a significant simplification of the expressions in the discrete virtual work functionals. In addition, independent strategies can be chosen for interpolating the nodal centerline points and cross-section orientations. We discuss three objective interpolation strategies and give an in-depth analysis concerning locking and convergence behavior for the whole family of rod finite element formulations.Item Open Access Fast bidirectional vector wave propagation method showcased on targeted noise reduction in imaging fiber bundles using 3D-printed micro optics(2023) Wende, Marco; Drozella, Johannes; Herkommer, AloisItem Open Access General mathematical model for the period chirp in interference lithography(2023) Bienert, Florian; Graf, Thomas; Abdou Ahmed, MarwanItem Open Access 3D printing of colored micro-optics(2023) Aslani, Valese; Toulouse, Andrea; Schmid, Michael; Giessen, Harald; Haist, Tobias; Herkommer, AloisItem Open Access Generation of a radially polarized beam in a polycrystalline ceramic Yb:Lu2O3 thin-disk laser(2023) Didychenko, Denys; Esser, Stefan; Beirow, Frieder; Savchenko, Anton; Pruss, Christof; Graf, Thomas; Abdou Ahmed, MarwanAbstractWe report on the generation of a continuous-wave (CW) radially polarized beam with an Yb:Lu2O3 polycrystalline ceramic disk in a thin-disk laser (TDL) oscillator. A circular grating-waveguide mirror (CGWM) with a high polarization discrimination given by a reflectivity difference between the two orthogonal polarization states of 44.6% was used as a polarization-selective cavity end-mirror. An output power of 175 W was achieved with an optical efficiency of 39.6%. A high degree of radial polarization of 96.2% and a beam propagation factor of M2hor. = 2.05 and M2ver. = 2.32 were measured at the maximum output power.Item Open Access Numerical analysis of micro-optics based single photon sources via a combined physical optics and rigorous simulations approach(2023) Jimenez, Carlos; Hellmann, Christian; Toulouse, Andrea; Drozella, Johannes; Wyrowski, Frank; Herkommer, AloisItem Open Access Retrace error calibration for interferometric measurements using an unknown optical system(2023) Beisswanger, Rolf; Pruss, Christof; Reichelt, StephanItem Open Access Field evaluation of a novel holographic single-image depth reconstruction sensor(2023) Hartlieb, Simon; Schober, Christian; Haist, Tobias; Reichelt, StephanItem Open Access Advantages of holographic imaging through fog(2023) Gröger, Alexander; Pedrini, Giancarlo; Claus, Daniel; Alekseenko, Igor; Gloeckler, Felix; Reichelt, StephanItem Open Access Data-driven development of sparse multi-spectral sensors for urological tissue differentiation(2023) Fischer, Felix; Frenner, Karsten; Granai, Massimo; Fend, Falko; Herkommer, Alois