TY - DATA AU - Claes, Leander AU - Webersen, Manuel ID - 12950 TI - pyfds 0.1.6 - modular field simulation tool ER - TY - CONF AU - Zeipert, Henning AU - von Germeten, Christian AU - Friesen, Olga AU - Claes, Leander AU - Johannesmann, Sarah AU - Henning, Bernd ID - 43233 T2 - Fortschritte der Akustik - DAGA 2023 TI - Investigation of change in dispersive behaviour during adhesive curing in multi-layered structures ER - TY - CONF AU - Claes, Leander ID - 43229 T2 - Fortschritte der Akustik - DAGA 2023 TI - Bestimmung der Volumenviskosität mittels akustischer Absorptionsmessung ER - TY - CONF AU - Nicolai, Marcel AU - Zeipert, Henning AU - Lugovtsova, Yevgeniya AU - Bulling, Jannis AU - Johannesmann, Sarah AU - Prager, Jens AU - Henning, Bernd ID - 43234 T2 - Fortschritte der Akustik - DAGA 2023 TI - Characterization of adhesion strength using guided ultrasonic waves ER - TY - JOUR AU - Hetkämper, Tim AU - Koch, Kevin AU - Claes, Leander AU - Henning, Bernd ID - 37543 IS - 2 JF - tm - Technisches Messen KW - Schlierentechnik TI - Phase-preserving methods to visualise ultrasonic fields with schlieren imaging VL - 90 ER - TY - CONF AU - Dreiling, Dmitrij AU - Itner, Dominik AU - Hetkämper, Tim AU - Birk, Carolin AU - Gravenkamp, Hauke AU - Henning, Bernd ID - 45205 SN - 978-3-9819376-8-8 T2 - SMSI 2023 Conference TI - Improved determination of viscoelastic material parameters using a pulse-echo measurement setup ER - TY - JOUR AU - Claes, Leander AU - Feldmann, Nadine AU - Schulze, Veronika AU - Meihost, Lars AU - Kuhlmann, Henrik AU - Jurgelucks, Benjamin AU - Walther, Andrea AU - Henning, Bernd ID - 45445 IS - 1 JF - Journal of Sensors and Sensor Systems TI - Inverse procedure for measuring piezoelectric material parameters using a single multi-electrode sample VL - 12 ER - TY - GEN AU - Claes, Leander AU - Meihost, Lars AU - Jurgelucks, Benjamin ID - 45455 TI - Inverse procedure for the identification of piezoelectric material parameters supported by dense neural networks ER - TY - CONF AU - Hetkämper, Tim AU - Koch, Kevin AU - Webersen, Manuel AU - Claes, Leander ID - 47138 T2 - SEFI 51th Annual Conference Proceedings - Engineering Education for Sustainability TI - Application-based learning of signal analysis methods with the help of a graphical open-source software ER - TY - JOUR AU - Hetkämper, Tim AU - Claes, Leander AU - Henning, Bernd ID - 48053 IS - s1 JF - tm - Technisches Messen KW - Electrical and Electronic Engineering KW - Instrumentation SN - 2196-7113 TI - Vorzeichenrichtige tomographische Rekonstruktion von Ultraschallfeldern mit Hilfe der Schlierentechnik VL - 90 ER - TY - GEN AU - Scheidemann, Claus AU - Hemsel, Tobias AU - Friesen, Olga AU - Claes, Leander AU - Sextro, Walter ID - 51117 TI - Influence of Temperature and Pre-Stress on the Piezoelectric Material Behavior of Ring-Shaped Ceramics ER - TY - GEN AU - Scheidemann, Claus AU - Hemsel, Tobias AU - Friesen, Olga AU - Claes, Leander AU - Sextro, Walter ID - 51118 TI - Influence of Temperature and Pre-Stress on the Piezoelectric Material Behavior of Ring-Shaped Ceramics ER - TY - CONF AU - Nicolai, Marcel AU - Zeipert, Henning AU - Lugovtsova, Yevgeniya AU - Bulling, Jannis AU - Johannesmann, Sarah AU - Prager, Jens AU - Henning, Bernd ID - 6590 T2 - Fortschritte der Akustik - DAGA 2022 TI - Quantification of the adhesive coupling of layered structures using guided ultrasonic waves ER - TY - GEN AU - Hetkämper, Tim ID - 6561 TI - Visualisierung von Ultraschallfeldern mittels Schlierentechnik und fraktionaler Fouriertransformation ER - TY - GEN AU - Claes, Leander ID - 6592 TI - Messverfahren für die akustische Absorption zur Bestimmung der Volumenviskosität ER - TY - CONF AU - Hetkämper, Tim AU - Claes, Leander AU - Henning, Bernd ID - 31331 SN - 978-3-8007-5835-7 T2 - Sensoren und Messsysteme - Beiträge der 21. ITG/GMA-Fachtagung TI - Schlieren imaging with fractional Fourier transform to visualise ultrasonic fields ER - TY - CONF AU - Claes, Leander AU - Feldmann, Nadine AU - Schulze, Veronika AU - Jurgelucks, Benjamin AU - Walther, Andrea AU - Henning, Bernd ID - 6553 T2 - Fortschritte der Akustik - DAGA 2022 TI - Identification of piezoelectric material parameters using optimised multi-electrode specimens ER - TY - JOUR AB - An explicit approach using symplectic time integration in conjunction with traditional finite difference spatial derivatives to solve the wave equation in moving media is presented. A simple operator split of this second order wave equation into two coupled first order equations is performed, allowing these split equations to be solved symplectically. Orders of symplectic time integration ranging from first to fourth along with orders of spatial derivatives ranging from second to sixth are explored. The case of cylindrical acoustic spreading in air under a constant velocity in a 2D square structured domain is considered. The variation of the computed time-of-flight, frequency, and wave length are studied with varying grid resolution and the deviations from the analytical solutions are determined. It was found that symplectic time integration interferes with finite difference spatial derivatives higher than second order causing unexpected results. This is actually beneficial for unstructured finite volume tools like OpenFOAM where second order spatial operators are the state-of-the art. Cylindrical acoustic spreading is simulated on an unstructured 2D triangle mesh showing that symplectic time integration is not limited to the spatial discretization paradigm and overcomes the numerical diffusion arising with the in-built numerical methods which hinder wave propagation. AU - Inguva, Venkatesh AU - Feldmann, Nadine AU - Claes, Leander AU - Koturbash, Taras AU - Hahn-Jose, Thomas AU - Koutcherov, Vladimir AU - Kenig, Eugeny ID - 6579 JF - Engineering Reports TI - An explicit symplectic approach to solving the wave equation in moving media ER - TY - GEN AU - Itner, Dominik AU - Gravenkamp, Hauke AU - Dreiling, Dmitrij AU - Birk, Carolin AU - Henning, Bernd ID - 17090 TI - Differentiation of an SBFE model in the context of material parameter determination ER - TY - GEN AU - Friesen, Olga AU - Claes, Leander AU - Feldmann, Nadine AU - Henning, Bernd ID - 6558 TI - Estimation of piezoelectric material parameters of ring-shaped specimens ER -