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 - 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 - 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 - 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 - 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 - 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 - TY - JOUR AB - Abstract In this paper a measurement procedure to identify viscoelastic material parameters of plate-like samples using broadband ultrasonic waves is presented. Ultrasonic Lamb waves are excited via the thermoelastic effect using laser radiation and detected by a piezoelectric transducer. The resulting measurement data is transformed to yield information about multiple propagating Lamb waves as well as their attenuation. These results are compared to simulation results in an inverse procedure to identify the parameters of an elastic and a viscoelastic material model. AU - Johannesmann, Sarah AU - Claes, Leander AU - Feldmann, Nadine AU - Zeipert, Henning AU - Henning, Bernd ID - 30863 IS - 7 - 8 JF - tm - Technisches Messen KW - Electrical and Electronic Engineering KW - Instrumentation SN - 2196-7113 TI - Lamb wave based approach to the determination of acoustic material parameters VL - 89 ER - TY - CONF AU - Johannesmann, Sarah AU - Claes, Leander AU - Henning, Bernd ID - 6588 T2 - Fortschritte der Akustik - DAGA 2022 TI - Estimation of viscoelastic material parameters of polymers using Lamb waves ER - TY - CONF AU - Zeipert, Henning AU - Johannesmann, Sarah AU - Nicolai, Marcel AU - Lugovtsova, Yevgeniya AU - Prager, Jens AU - Henning, Bernd ID - 26033 T2 - Fortschritte der Akustik - DAGA 2021 TI - Quantifying the coupling strength of adhesively bonded materials by investigating mode repulsion regions ER - TY - CONF AU - Lugovtsova, Yevgeniya AU - Zeipert, Henning AU - Johannesmann, Sarah AU - Nicolai, Marcel AU - Prager, Jens AU - Henning, Bernd ID - 27847 T2 - МАТЕМАТИЧЕСКОЕ МОДЕЛИРОВАНИЕ В ЕСТЕСТВЕННЫХ НАУКАХ - XXX Всероссийская школа-конференция TI - К ОПРЕДЕЛЕНИЮ ПРОЧНОСТИ КЛЕЕВОГО СОЕДИНЕНИЯ В МНОГОСЛОЙНЫХ МАТЕРИАЛАХ ПУТЕМ ИССЛЕДОВАНИЯ ОБЛАСТЕЙ РАСТАЛКИВАНИЯ БЕГУЩИХ УПРУГИХ ВОЛН ER - TY - JOUR AB - Acoustic waves in plates have proven a viable tool for testing and material characterisation purposes. There are a multitude of options for excitation and detection of theses waves, such as optical and piezoelectric systems. While optical systems, with thermoelastic excitation and interferometric detection, have the benefit of being contactless, they usually require rather complex and expensive experimental setups. Piezoelectric systems are more easily realised but require direct contact with the specimen and usually have a limited bandwidth, especially in case of piezoelectric excitation. In this work, the authors compare the properties of piezoelectric and optical detection methods for broad-band acoustic signals. The shape (e. g. the displacement) of a propagating plate wave is given by its frequency and wave number, allowing to investigate correlations between mode shapes and received signal strengths. This is aided by evaluations in normalised frequency and wavenumber space, facilitating comparisons of different specimens. Further, the authors explore possibilities to utilise the specific properties of the detection methods to determine acoustic material parameters. AU - Claes, Leander AU - Schmiegel, Hanna AU - Grünsteidl, Clemens AU - Johannesmann, Sarah AU - Webersen, Manuel AU - Henning, Bernd ID - 21067 IS - 3 JF - tm - Technisches Messen SN - 2196-7113 TI - Investigating peculiarities of piezoelectric detection methods for acoustic plate waves in material characterisation applications VL - 88 ER - TY - JOUR AU - Itner, Dominik AU - Gravenkamp, Hauke AU - Dreiling, Dmitrij AU - Feldmann, Nadine AU - Henning, Bernd ID - 21082 JF - PAMM SN - 1617-7061 TI - Simulation of guided waves in cylinders subject to arbitrary boundary conditions for applications in material characterization ER - TY - GEN AU - Itner, Dominik AU - Gravenkamp, Hauke AU - Dreiling, Dmitrij AU - Feldmann, Nadine AU - Henning, Bernd ID - 21564 TI - On the forward simulation and cost functions for the ultrasonic material characterization of polymers ER - TY - JOUR AU - Johannesmann, Sarah AU - Claes, Leander AU - Henning, Bernd ID - 23791 IS - s1 JF - tm - Technisches Messen TI - Lamb wave based approach to the determination of elastic and viscoelastic material parameters VL - 88 ER - TY - CONF AU - Zeipert, Henning AU - Claes, Leander AU - Johannesmann, Sarah AU - Webersen, Manuel AU - Lugovtsova, Yevgeniya AU - Prager, Jens AU - Henning, Bernd ID - 22013 TI - Measurement and Simulation of Lamb Waves in Adhesive-bonded Multilayer Systems ER - TY - JOUR AU - Claes, Leander AU - Chatwell, René Spencer AU - Baumhögger, Elmar AU - Hetkämper, Tim AU - Zeipert, Henning AU - Vrabec, Jadran AU - Henning, Bernd ID - 22925 JF - Measurement SN - 0263-2241 TI - Measurement procedure for acoustic absorption and bulk viscosity of liquids ER - TY - JOUR AB - An approach for the non-destructive characterisation of adhesive bonds using guided ultrasonic waves is presented. Pulsed laser radiation is used to thermoacoustically excite broadband ultrasonic waves in a multi-layered sample, consisting of a metal plate adhesively joined to a polymeric layer using synthetic resin. The resulting signals are received by a purpose-built piezoelectric transducer. Varying the distance between excitation and detection yields spatio-temporal measurement data, from which the dispersive properties of the propagating waves can be inferred using a two-dimensional Fourier transform, assuming the plates to act as coupled waveguides. Coupled multi-layered waveguides show an effect referred to as mode repulsion, where the distance between certain modes in the frequency-wavenumber domain is assumed to be a measure of coupling strength. Measurements at different stages of curing of the adhesive layer are performed and evaluated. A comparison of the results shows changes in the dispersive properties, namely an increased modal bandwidth for the fully cured sample as well as an increased modal distance. AU - Zeipert, Henning AU - Claes, Leander AU - Johannesmann, Sarah AU - Lugovtsova, Yevgeniya AU - Nicolai, Marcel AU - Prager, Jens AU - Henning, Bernd ID - 27367 JF - at - Automatisierungstechnik SN - 2196-677X TI - An approach to adhesive bond characterisation using guided acoustic waves in multi-layered plates ER - TY - CONF AU - Hetkämper, Tim AU - Dreiling, Dmitrij AU - Claes, Leander AU - Henning, Bernd ID - 25880 T2 - Fortschritte der Akustik - DAGA 2021 TI - Tomographie des Schallfelds von Ultraschallwandlern mittels Schlierentechnik ER - TY - CONF AB - Waveguide-based methods can be used for the non-destructive determination of acoustic material parameters. One of these methods is based on transmission measurements of cylindrical polymeric specimens. Here, the experimental setup consists of two transducers, which excite and receive the waveguide modes at the faces of the cylinder. The measurement, as well as a forward model, are used to determine material parameters of the polymeric specimen in an inverse approach. 1-3 piezoelectric composites are used as an active element because they can be approximated by a thickness vibration only. This allows an easy identification of Mason model parameters to characterise the transducers’ vibration behaviour. However, sensitivity analysis shows a high uncertainty in the determination of the mechanical shear parameters due to the uniform excitation. To increase the sensitivity to these shear motions, arbitrary excitations were investigated by means of numerical simulation. In order to be able to realise the determined optimal excitation, new transducer prototypes were designed. By subdividing the electrodes of the active element, for example, ring-shaped excitation is feasible. Furthermore, it can be shown that modelling these transducers with a one-dimensional Mason model is sufficient. AU - Dreiling, Dmitrij AU - Itner, Dominik AU - Feldmann, Nadine AU - Scheidemann, Claus AU - Gravenkamp, Hauke AU - Henning, Bernd ID - 25265 T2 - Fortschritte der Akustik - DAGA 2021 TI - Application and modelling of ultrasonic transducers using 1-3 piezoelectric composites with structured electrodes ER - TY - JOUR AB - The progress in numerical methods and simulation tools promotes the use of inverse problems in material characterisation problems. A newly developed procedure can be used to identify the behaviour of piezoceramic discs over a wide frequency range using a single specimen via fitting simulated and measured impedances by optimising the underlying material parameters. Since there is no generally accepted damping model for piezoelectric ceramics, several mechanical damping models are examined for the material identification. Three models have been chosen and their ability to replicate the measured impedances is evaluated. On the one hand, the common Rayleigh model is considered as a reference. On the other hand, a Zener model and a model using complex constants are extended to model the transversely isotropic material. As the Rayleigh model is only valid for a limited frequency range, it fails to model the broadband behaviour of the material. The model using complex constants leads to the best fit over a wide frequency range while at the same time only adding three additional parameters for modelling damping. Thus, damping can be assumed approximately frequency-independent in piezoceramics. AU - Feldmann, Nadine AU - Schulze, Veronika AU - Claes, Leander AU - Jurgelucks, Benjamin AU - Meihost, Lars AU - Walther, Andrea AU - Henning, Bernd ID - 21341 IS - 5 JF - tm - Technisches Messen SN - 2196-7113 TI - Modelling damping in piezoceramics: A comparative study VL - 88 ER - TY - CONF AU - Claes, Leander AU - Feldmann, Nadine AU - Jurgelucks, Benjamin AU - Schulze, Veronika AU - Schmidt, Stephan AU - Walther, Andrea AU - Henning, Bernd ID - 22012 TI - Optimised Multi-Electrode Topology for Piezoelectric Material Characterisation ER - TY - CONF AU - Itner, D. AU - Gravenkamp, H. AU - Dreiling, Dmitrij AU - Feldmann, Nadine AU - Henning, Bernd ID - 40541 T2 - 14th WCCM-ECCOMAS Congress TI - Simulation of Guided Waves in Cylinders Subject to Arbitrary Boundary Conditions Using the Scaled Boundary Finite Element Method VL - 700 ER - TY - JOUR AU - Itner, Dominik AU - Gravenkamp, Hauke AU - Dreiling, Dmitrij AU - Feldmann, Nadine AU - Henning, Bernd ID - 21232 JF - Ultrasonics SN - 0041-624X TI - Efficient semi-analytical simulation of elastic guided waves in cylinders subject to arbitrary non-symmetric loads ER - TY - CHAP AU - Moritzer, Elmar AU - Hüttner, Matthias AU - Henning, Bernd AU - Webersen, Manuel ED - Hopmann, Christian ED - Dahlmann, Rainer ID - 17352 SN - 9783662608081 T2 - Advances in Polymer Processing 2020 TI - The Influence of Hydrothermal Aging on the Material Properties of Continuous Fiber-Reinforced Thermoplastics and its Non-Destructive Characterization ER - TY - JOUR AB -

The impact of the recombination mechanisms in luminescent materials is discussed with regard to luminescence based gas-sensing applications and the use of semiconducting materials, as an alternative to organic–metal complexes, is outlined.

AU - Poeplau, Michael AU - Ester, Stephan AU - Henning, Bernd AU - Wagner, Thorsten ID - 18850 JF - Physical Chemistry Chemical Physics SN - 1463-9076 TI - Recombination mechanisms of luminescence type gas sensors ER - TY - CONF AU - Dreiling, Dmitrij AU - Itner, Dominik Thor AU - Feldmann, Nadine AU - Gravenkamp, Hauke AU - Henning, Bernd ID - 17089 TI - Increasing the sensitivity in the determination of material parameters by using arbitrary loads in ultrasonic transmission measurements ER - TY - CONF AU - Claes, Leander AU - Baumhögger, Elmar AU - Rüther, Torben AU - Gierse, Jan AU - Tröster, Thomas AU - Henning, Bernd ID - 15490 T2 - Fortschritte der Akustik - DAGA 2020 TI - Reduction of systematic measurement deviation in acoustic absorption measurement systems ER - TY - CONF AU - Feldmann, Nadine AU - Schulze, Veronika AU - Jurgelucks, Benjamin AU - Henning, Bernd ID - 15163 T2 - Fortschritte der Akustik - DAGA 2020 TI - Solving piezoelectric inverse problems using Algorithmic Differentiation ER - TY - CONF AU - Johannesmann, Sarah AU - Becker, Sebastian AU - Webersen, Manuel AU - Henning, Bernd ID - 15264 SN - 978-3-9819376-2-6 T2 - SMSI 2020 - Measurement Science TI - Determination of Murnaghan constants of plate-shaped polymers under uniaxial tensile load ER - TY - JOUR AB - The increasingly simulation-driven design process of ultrasonic transducers requires several reliable parameters for the description of the material behaviour. Exact results can only be achieved when a single specimen is used in the identification process, which typically is prone to the problem of low sensitivities to certain material parameters and thus high uncertainties. Therefore, a custom electrode topology for increased sensitivity is proposed for a piezoceramic disc. The thereupon conducted measurements of the electric impedance can be used as a starting point for an inverse approach where an equivalent simulation model is used to identify fitting material parameters. An optimisation strategy based on a preliminary sensitivity analysis is presented that leads to a good agreement between measurement and simulation. Furthermore, the proposed measurement procedure is able to evaluate the quality of the simulation model. Hence, different frequency-dependent damping models are presented and evaluated. AU - Feldmann, Nadine AU - Schulze, Veronika AU - Claes, Leander AU - Jurgelucks, Benjamin AU - Walther, Andrea AU - Henning, Bernd ID - 19313 JF - tm - Technisches Messen SN - 2196-7113 TI - Inverse piezoelectric material parameter characterization using a single disc-shaped specimen ER - TY - CHAP AU - Moritzer, Elmar AU - Hüttner, M. AU - Henning, Bernd AU - Webersen, Manuel ID - 24479 T2 - Advances in Polymer Processing 2020 TI - The Influence of Hydrothermal Aging on the Material Properties of Continuous Fiber-Reinforced Thermoplastics and its Non-Destructive Characterization ER - TY - JOUR AU - Claes, Leander AU - Steidl, Carolin AU - Hetkämper, Tim AU - Henning, Bernd ID - 15489 JF - arXiv.org TI - Estimation of acoustic wave non-linearity in ultrasonic measurement systems ER - TY - CONF AU - Poeplau, Michael AU - Ester, Stephan AU - Henning, Bernd AU - Wagner, Thorsten ID - 51879 TI - Zinkoxid als photostabiler Luminophor zur optischen Sauerstoffdetektion ER - TY - CONF AU - Johannesmann, Sarah AU - Webersen, Manuel AU - Düchting, Julia AU - Claes, Leander AU - Henning, Bernd ID - 9718 T2 - 45th Annual Review of Progress in Quantitative Nondestructive Evaluation TI - Characterization of the linear-acoustic material behavior of fiber-reinforced composites using lamb waves VL - 38 ER - TY - CONF AB - The continuous refinement of sensor technologies enables the manufacturing industry to capture increasing amounts of data during the production process. As processes take time to complete, sensors register large amounts of time-series-like data for each product. In order to make this data usable, a feature extraction is mandatory. In this work, we discuss and evaluate different network architectures, input pre-processing and cost functions regarding, among other aspects, their suitability for time series of different lengths. AU - Thiel, Christian AU - Steidl, Carolin AU - Henning, Bernd ID - 15488 KW - Dynamic Time Warping KW - Feature Extraction KW - Masking KW - Neural Networks SN - 978-3-9819376-0-2 T2 - 20. GMA/ITG-Fachtagung. Sensoren und Messsysteme 2019 TI - P2.9 Comparison of deep feature extraction techniques for varying-length time series from an industrial piercing press ER - TY - CONF AU - Feldmann, Nadine AU - Jurgelucks, Benjamin AU - Claes, Leander AU - Henning, Bernd ID - 15164 T2 - 2019 International Congress on Ultrasonics TI - A sensitivity-based optimisation procedure for the characterisation of piezoelectric discs ER - TY - CONF AU - Lugovtsova, Yevgeniya AU - Johannesmann, Sarah AU - Henning, Bernd AU - Prager, Jens ID - 15261 T2 - 2019 International Congress on Ultrasonics TI - Analysis of Lamb wave mode repulsion and its implications to the characterisation of adhesive bonding strength ER - TY - CONF AU - Hetkämper, Tim AU - Claes, Leander AU - Henning, Bernd ID - 16076 T2 - 2019 International Congress on Ultrasonics TI - Evolutionary algorithm for the design of passive electric matching networks for ultrasonic transducers ER - TY - JOUR AU - Claes, Leander AU - Hülskämper, Lars Moritz AU - Baumhögger, Elmar AU - Feldmann, Nadine AU - Chatwell, René Spencer AU - Vrabec, Jadran AU - Henning, Bernd ID - 13143 JF - tm - Technisches Messen SN - 2196-7113 TI - Acoustic absorption measurement for the determination of the volume viscosity of pure fluids / Messverfahren für die akustischen Absorption zur Bestimmung der Volumenviskosität reiner Fluide ER - TY - CONF AU - Johannesmann, Sarah AU - Springer, Dimitri AU - Thiel, Christian AU - Henning, Bernd ED - Gesellschaft für Akustik e.V., Deutsche ID - 10042 T2 - Fortschritte der Akustik - DAGA 2019 TI - Störeffektunterdrückung in 2D-Messdaten mittels DiscoGAN VL - 45 ER - TY - CONF AU - Webersen, Manuel AU - Hüttner, Matthias AU - Woitschek, Fabian AU - Moritzer, Elmar AU - Henning, Bernd ID - 10135 T2 - Fortschritte der Akustik - DAGA 2019 TI - Akustische Charakterisierung der mechanischen Eigenschaften künstlich gealterter Polymere ER - TY - CONF AU - Claes, Leander AU - Johannesmann, Sarah AU - Baumhögger, Elmar AU - Henning, Bernd ID - 13647 T2 - 2019 International Congress on Ultrasonics TI - Quantification of frequency-dependent absorption phenomena ER - TY - CONF AU - Dreiling, Dmitrij AU - Feldmann, Nadine AU - Henning, Bernd ID - 12952 KW - piezoelectric materials KW - piezoelectric properties KW - DC bias field KW - non-linear material parameters TI - A DC bias approach to the characterisation of non-linear material parameters of piezoelectric ceramics ER - TY - JOUR AU - Feldmann, Nadine AU - Jurgelucks, Benjamin AU - Claes, Leander AU - Schulze, Veronika AU - Henning, Bernd AU - Walther, Andrea ID - 6562 IS - 2 JF - tm - Technisches Messen TI - An inverse approach to the characterisation of material parameters of piezoelectric discs with triple-ring-electrodes VL - 86 ER - TY - JOUR AU - Johannesmann, Sarah AU - Düchting, Julia AU - Webersen, Manuel AU - Claes, Leander AU - Henning, Bernd ID - 6567 IS - 85 JF - tm - Technisches Messen KW - Continous-fibre reinforced plastics KW - material parameters KW - orthotropy KW - ultrasonics SN - 0171-8096 TI - An acoustic waveguide-based approach to the complete characterisation of linear elastic, orthotropic material behaviour VL - 2018 ER - TY - CONF AU - Johannesmann, Sarah AU - Brockschmidt, Tobias AU - Rump, Friedhelm AU - Webersen, Manuel AU - Claes, Leander AU - Henning, Bernd ID - 6568 T2 - Sensoren und Messsysteme TI - Acoustic material characterization of prestressed, plate-shaped specimens ER - TY - JOUR AU - Webersen, Manuel AU - Johannesmann, Sarah AU - Düchting, Julia AU - Claes, Leander AU - Henning, Bernd ID - 6577 JF - Ultrasonics TI - Guided ultrasonic waves for determining effective orthotropic material parameters of continuous-fiber reinforced thermoplastic plates VL - 84 ER - TY - CONF AU - Webersen, Manuel AU - Johannesmann, Sarah AU - Düchting, Julia AU - Claes, Leander AU - Henning, Bernd ID - 6578 T2 - Fortschritte der Akustik - DAGA 2018 TI - Akustische Charakterisierung der richtungsabhängigen elastischen Eigenschaften faserverstärkter Kunststoffe ER - TY - CONF AU - Feldmann, Nadine AU - Henning, Bernd ID - 6584 T2 - Fortschritte der Akustik TI - Efficient optimisation of initial values for characterising piezoelectric material parameters ER - TY - CONF AU - Thiel, Christian AU - Feldmann, Nadine AU - Henning, Bernd ID - 6586 T2 - Sensoren und Messsysteme 2018 TI - Extraction of Interpretable Features from Temporal Measurements using Approximate Prototypes ER - TY - GEN AU - Claes, Leander AU - Feldmann, Nadine AU - Henning, Bernd ID - 6593 TI - Materialparameter von bleihaltigen und bleifreien Piezokeramiken und ihre Bedeutung in der Anwendung ER - TY - GEN AU - Claes, Leander AU - Zeipert, Henning AU - Koppa, Peter AU - Tröster, Thomas AU - Henning, Bernd ID - 6594 TI - Additiv gefertigte, akustische Diffusor-Strukturen für Ultraschallanwendungen ER - TY - GEN AU - Feldmann, Nadine AU - Jurgelucks, Benjamin AU - Claes, Leander AU - Henning, Bernd ID - 6595 TI - Vollständige Charakterisierung von piezoelektrischen Scheiben mit Ringelektroden ER - TY - GEN AU - Webersen, Manuel AU - Johannesmann, Sarah AU - Brockschmidt, Tobias AU - Rump, Friedhelm AU - Claes, Leander AU - Henning, Bernd ID - 6596 TI - Einfluss mechanischer Vorspannung auf das mechanische Materialverhalten von Polymeren ER - TY - JOUR AU - Jurgelucks, Benjamin AU - Claes, Leander AU - Walther, Andrea AU - Henning, Bernd ID - 6571 IS - 4-6 JF - Optimization Methods and Software SN - 1055-6788 TI - Optimization of triple-ring electrodes on piezoceramic transducers using algorithmic differentiation VL - 33 ER - TY - JOUR AU - Bause, Fabian AU - Claes, Leander AU - Webersen, Manuel AU - Johannesmann, Sarah AU - Henning, Bernd ID - 6552 IS - 3 JF - tm - Technisches Messen SN - 0171-8096 TI - Viskoelastizität und Anisotropie von Kunststoffen: Ultraschallbasierte Methoden zur Materialparameterbestimmung VL - 84 ER - TY - CONF AU - Claes, Leander AU - Chatwell, René Spencer AU - Vrabec, Jadran AU - Henning, Bernd ID - 6556 SN - 978-3-9816876-4-4 T2 - PROCEEDINGS -- AMA Conferences 2017 TI - A Spectral Approach to Acoustic Absorption Measurement ER - TY - CONF AU - Claes, Leander AU - Jäger, Axel AU - Johannesmann, Sarah AU - Webersen, Manuel AU - Kupnik, Mario AU - Henning, Bernd ID - 6557 SN - 978-3-9816876-4-4 T2 - PROCEEDINGS -- AMA Conferences 2017 TI - Acoustic Material Characterization of Additively Manufactured Components ER - TY - CONF AU - Claes, Leander AU - Zeipert, Henning AU - Koppa, Peter AU - Tröster, Thomas AU - Henning, Bernd ID - 6559 T2 - Proceedings of Meetings on Acoustics TI - Additively manufactured acoustic diffuser structures for ultrasonic measurement applications ER - TY - CONF AU - Jäger, Axel AU - Johannesmann, Sarah AU - Claes, Leander AU - Webersen, Manuel AU - Henning, Bernd AU - Kupnik, Mario ID - 6565 T2 - 2017 IEEE IUS~Proceedings TI - Evaluating the Influence of 3D-Printing Parameters on Acoustic Material Properties ER - TY - CONF AU - Johannesmann, Sarah AU - Claes, Leander AU - Webersen, Manuel AU - Henning, Bernd ID - 6566 T2 - Fortschritte der Akustik - DAGA 2017 TI - Inverser Ansatz zur akustischen Charakterisierung plattenförmiger Materialproben ER - TY - CONF AU - Jurgelucks, Benjamin AU - Feldmann, Nadine AU - Claes, Leander AU - Henning, Bernd AU - Walther, Andrea ID - 6572 T2 - Proceedings of Meetings on Acoustics TI - Material parameter determination of a piezoelectric disc with triple-ring-electrodes for increased sensitivity ER - TY - CONF AU - Bause, Fabian AU - Claes, Leander AU - Webersen, Manuel AU - Henning, Bernd ID - 6575 SN - 978-3-9816876-4-4 T2 - PROCEEDINGS -- AMA Conferences 2017 TI - Ultrasonic measurements in the characterization of viscoelasticity and aging of polymers ER - TY - CONF AU - Feldmann, Nadine AU - Bause, Fabian AU - Henning, Bernd ID - 6583 T2 - Proceedings – AMA Conferences 2017 TI - Determining fractional Zener model parameters from low frequency DMA measurements ER - TY - GEN AU - Claes, Leander AU - Feldmann, Nadine AU - Henning, Bernd ID - 6591 TI - Spektrale Verfahren zur Bestimmung der akustischen Absorption in fluiden Medien ER - TY - GEN AU - Webersen, Manuel AU - Henning, Bernd ID - 14862 TI - Ultraschallbasierte Charakterisierung des Alterungsverhaltens von Polymeren ER - TY - CONF AU - Moritzer, Elmar AU - Hüttner, M. AU - Henning, Bernd AU - Webersen, Manuel ID - 27246 T2 - 32nd International Conference of the Polymer Processing Society (PPS) TI - An Approach to Non-Destructive Testing of Aged Polymers ER - TY - JOUR AU - Moritzer, Elmar AU - Hüttner, M. AU - Henning, Bernd AU - Webersen, Manuel ID - 27250 IS - 10. Jg. Heft 4 JF - Kunststoffe international SN - 1862-4243 TI - Detecting Molecular Damage - Non-Destructive Characterization of Molecular Changes in Aged Polymers ER - TY - CONF AU - Moritzer, Elmar AU - Hüttner, M. AU - Henning, Bernd AU - Webersen, Manuel ID - 27253 T2 - Safe and Reliable Structures TI - Ein Ansatz zur zerstörungsfreien Prüfung von hydrothermisch gealterten Polymeren ER - TY - JOUR AU - Moritzer, Elmar AU - Hüttner, M. AU - Henning, Bernd AU - Webersen, Manuel ID - 27267 IS - 106. Jg. Heft 6 JF - Kunststoffe SN - 0023-5563 TI - Molekularen Schäden auf der Spur - Zerstörungsfreie Charakterisierung molekularer Veränderungen in gealterten Polymeren ER - TY - CONF AU - Schöppner, Volker AU - Hüttner, M. AU - Henning, Bernd AU - Webersen, Manuel ID - 27268 T2 - 74th Annual Technical Conference of the Society of Plastics Engineers (ANTEC) TI - Non-Destructive Characterization of Hygrothermally Aged Polymers ER - TY - CONF AU - Moritzer, Elmar AU - Fiebig, I. AU - Hüttner, M. AU - Henning, Bernd AU - Webersen, Manuel ID - 27276 T2 - 69th Annual Assembly of the International Institute of Welding (IIW) TI - The Development of a Non-Destructive Testing Method for the Characterization of Hygrothermally Aged Polymers ER - TY - JOUR AU - Moritzer, Elmar AU - Hüttner, M. AU - Henning, Bernd AU - Webersen, Manuel ID - 27278 JF - Jahresmagazin Kunststofftechnik SN - 1618-8357 TI - Ultraschallbasierte Charakterisierung von gealterten Polymeren ER - TY - CONF AU - Moritzer, Elmar AU - Hüttner, M. AU - Henning, Bernd AU - Webersen, Manuel ID - 27279 T2 - 18. GMA/ITG Fachtagung Sensoren und Messsysteme TI - Zerstörungsfreie Charakterisierung des hydrothermischen Alterungsverhaltens von Polymeren ER - TY - JOUR AU - Bause, Fabian AU - Rautenberg, Jens AU - Feldmann, Nadine AU - Webersen, Manuel AU - Claes, Leander AU - Gravenkamp, Hauke AU - Henning, Bernd ID - 6551 IS - 10 JF - Measurement Science and Technology KW - material characterization KW - material parameters KW - acoustic waveguide KW - daming KW - ultrasonic transducer TI - Ultrasonic transmission measurements in the characterization of viscoelasticity utilizing polymeric waveguides VL - 27 ER - TY - JOUR AU - Claes, Leander AU - Meyer, Thorsten AU - Bause, Fabian AU - Rautenberg, Jens AU - Henning, Bernd ID - 6555 IS - 1 JF - Journal of Sensors and Sensor Systems SN - 2194-878X TI - Determination of the material properties of polymers using laser-generated broadband ultrasound VL - 5 ER - TY - CONF AU - Webersen, Manuel AU - Johannesmann, Sarah AU - Claes, Leander AU - Henning, Bernd ID - 6576 T2 - 2016 IEEE IUS~Proceedings TI - Characterization of Continuous-fiber Reinforced Thermoplastics Using Thermoacoustically Excited Ultrasonic Lamb Waves ER - TY - CONF AU - Feldmann, Nadine AU - Bause, Fabian AU - Henning, Bernd ID - 6580 T2 - Sensoren und Messsysteme 2016 TI - Vergleich zweier Verfahren der Unsicherheitsabschätzung bei linearisierten inversen Problemen mittels Bayes’scher Inferenz und Pseudoinverse am Beispiel akustischer Transmissionsmessung ER - TY - JOUR AU - Feldmann, Nadine AU - Bause, Fabian AU - Henning, Bernd ID - 6582 IS - 4 JF - tm - Technisches Messen SN - 0171-8096 TI - Uncertainty estimation for linearised inverse problems comparing Bayesian inference and a pseudoinverse approach for acoustic transmission measurements VL - 84 ER - TY - GEN AU - Feldmann, Nadine AU - Bause, Fabian AU - Henning, Bernd ID - 15176 TI - GUM-konforme Unsicherheitsabschätzung bei inversen Problemen am Beispiel akustischer Transmissionsmessungen ER - TY - CONF AU - Bause, F. AU - Henning, Bernd ID - 13864 TI - 5.3.1 - Ein ultraschallbasiertes inverses Messverfahren zur Charakterisierung viskoelastischer Materialparameter von Polymeren ER - TY - CONF AU - Ester, S. AU - Struschka, M. AU - Henning, Bernd ID - 13865 TI - 3.2.3 - Direktgravimetrischer Partikelmasse-Sensor zur quasikontinuierlichen Emissionsmessung ER - TY - CONF AU - Moritzer, Elmar AU - Hüttner, Matthias AU - Henning, Bernd AU - Webersen, Manuel ID - 13215 TI - An Approach to Non-Destructive Testing of Aged Polymers ER - TY - JOUR AU - Moritzer, Elmar AU - Hüttner, Matthias AU - Henning, Bernd AU - Webersen, Manuel ID - 13216 IS - 4 JF - Kunststoffe TI - Molekularen Schäden auf der Spur ER - TY - JOUR AU - Moritzer, Elmar AU - Hüttner, Matthias AU - Henning, Bernd AU - Webersen, Manuel ID - 13217 IS - 4 JF - Kunststoffe International TI - Detecting Molecular Damage ER - TY - CONF AU - Moritzer, Elmar AU - Hüttner, Matthias AU - Henning, Bernd AU - Webersen, Manuel ID - 13218 SN - 978-0-692-71961-9 TI - Non-destructive characterization of hygrothermally aged polymers ER - TY - CHAP AU - Moritzer, Elmar AU - Hüttner, Matthias AU - Henning, Bernd AU - Webersen, Manuel ID - 13219 T2 - Jahresmagazin Kunststofftechnik 2016 TI - Ultraschallbasierte Charakterisierung von gealterten Polymeren ER - TY - CONF AB - In der zerstörungsfreien Werkstoffprüfung sind bereits zahlreiche Verfahren etabliert, deren Ziel die Detektion makroskopischer Defekt- und Fehlstellen (z.B. Risse, Poren, Fremdeinschlüsse) ist. Insbesondere bei Polymerwerkstoffen muss jedoch auch die Materialalterung auf molekularer Ebene berücksichtigt werden, die sich (zumeist negativ) auf die Materialkenngrößen auswirkt. Gängige Verfahren zur Bestimmung dieser Kenngrößen arbeiten jedoch üblicherweise zerstörend und sind somit beispielsweise für die vorbeugende Instandhaltung oder die Online-Komponentenüberwachung nur eingeschränkt geeignet. In diesem Beitrag wird ein Verfahren zur zerstörungsfreien Charakterisierung des Alterungszustandes von Polymeren vorgestellt. Dazu wird der Zusammenhang zwischen akustisch (zerstörungsfrei, mittels Ultraschall-Transmissionsmessung) bestimmten Kenngrößen und klassisch (zerstörend, z.B. mittels Zugprüfung) bestimmten hydrothermischer Alterung auf das Material Polyamid 6 (PA6) untersucht. Die Ergebnisse Kenngrößen betrachtet. Exemplarisch werden die Auswirkungen zeigen einen engen Zusammenhang zwischen der zerstörend bestimmten Viskositätszahl, die ein Maß für die mittlere Molekülkettenlänge darstellt, und der akustischen Longitudinalwellengeschwindigkeit. Das Molekülkettenabbau (Depolymerisation) bestimmt ist, kann somit auch akustisch und zerstörungsfrei charakterisiert werden. Auf dieser Basis können neuartige, zerstörungsfrei arbeitende Messsysteme entwickelt werden. AU - Webersen, Manuel AU - Hüttner, Matthias AU - Bause, Fabian AU - Moritzer, Elmar AU - Henning, Bernd ID - 13223 SN - 978-3-9816876-0-6 TI - Zerstörungsfreie Charakterisierung des hydrothermischen Alterungsverhaltens von Polymeren ER - TY - JOUR AU - Olfert, Sergei AU - Henning, Bernd ID - 13863 IS - 4 JF - Technisches Messen TI - Erweiterung des Raman-Nath-Modells zur Analyse von Schlierenabbildungen VL - 83 ER - TY - CONF AU - Claes, Leander AU - Bause, Fabian AU - Rautenberg, Jens AU - Henning, Bernd ID - 6554 KW - piezoceramics KW - strip transducers KW - plate waveguide KW - dispersion diagram T2 - Proceedings SENSOR 2015 TI - Detection of ultrasonic plate waves using ceramic strip transducers ER - TY - GEN AU - Olfert, Sergei AU - Henning, Bernd ID - 13866 TI - Analyse integral erfasster rotationssymmetrischer Schallwechseldruckverteilungen in Schlierenabbildungen ER - TY - CHAP AU - Olfert, Sergei AU - Henning, Bernd ID - 13877 SN - 9783110408539 T2 - XXIX Messtechnisches Symposium TI - Analyse integral erfasster Schallwechseldruckverteilungen in Schlierenabbildungen ER - TY - CONF AB - Several ultrasonic approaches for material determination are formulated in terms of an (nonlinear) inverse problem, e.g. immersion technique (Castaings et al. (2000)) or plate-waveguide techniques (Marzani et al. (2012)). In this contribution we focus on cylindrical waveguides for ultrasonic material determination and especially on the sensitivity of recorded transmission signals to the material properties. We utilize composite scaled sensitivities to determine the information content that can be achieved by the setup to certain parameters and discuss the limitations of the approach. AU - Bause, Fabian AU - Gravenkamp, Hauke AU - Rautenberg, Jens AU - Henning, Bernd ID - 13892 KW - Sensitivity inverse problem ultrasonic material determination TI - Model based sensitivity analysis in the determination of viscoelastic material properties using transmission measurements through circular waveguides ER - TY - JOUR AU - Bause, Fabian AU - Gravenkamp, Hauke AU - Rautenberg, Jens AU - Henning, Bernd ID - 13894 JF - Measurement Science and Technology SN - 0957-0233 TI - Transient modeling of ultrasonic guided waves in circular viscoelastic waveguides for inverse material characterization ER - TY - GEN AU - Olfert, Sergei AU - Henning, Bernd ID - 13896 SN - 978-3-939296-08-9 TI - Schallfeldcharakterisierung mittels Schlierentechnik ER -