Daniel A. Kiefer
Daniel A. Kiefer
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Computation of leaky waves in layered structures coupled to unbounded media by exploiting multiparameter eigenvalue problems
We present a semi-analytical approach to compute quasi-guided elastic wave modes in horizontally layered structures radiating into …
Hauke Gravenkamp
,
Bor Plestenjak
,
Daniel A. Kiefer
,
Elias Jarlebring
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Viscoelastic dynamics of a soft strip subject to a large deformation
To produce sounds, we adjust the tension of our vocal folds to shape their properties and control the pitch. This efficient mechanism …
Alexandre Delory
,
Daniel A. Kiefer
,
Maxime Lanoy
,
Antonin Eddi
,
Claire Prada
,
Fabrice Lemoult
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Beating resonance patterns and extreme power flux skewing in anisotropic elastic plates
Elastic waves in anisotropic media can exhibit a power flux that is not collinear with the wave vector. This has notable consequences …
Daniel A. Kiefer
,
Sylvain Mezil
,
Claire Prada
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Notes on osculations and mode tracing in semi-analytical waveguide modeling
The dispersion curves of (elastic) waveguides frequently exhibit crossings and osculations (also known as veering, repulsion, or …
Hauke Gravenkamp
,
Bor Plestenjak
,
Daniel A. Kiefer
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Computing zero-group-velocity points in anisotropic elastic waveguides: Globally and locally convergent methods
Dispersion curves of elastic waveguides exhibit points where the group velocity vanishes while the wavenumber remains finite. These are …
Daniel A. Kiefer
,
Bor Plestenjak
,
Hauke Gravenkamp
,
Claire Prada
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Transit Time of Lamb Wave-Based Ultrasonic Flow Meters and the Effect of Temperature
Transit-time flow meters need to compensate for cross-sensitivity to temperature. We show that Lamb wave-based setups are less affected …
Daniel A. Kiefer
,
Andreas Benkert
,
Stefan J. Rupitsch
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Comparison of Transmission Measurement Methods of Elastic Waves in Phononic Band Gap Materials
Periodic cellular structures can exhibit metamaterial properties, such as phononic band gaps. In order to detect these frequency bands …
Maximilian Wormser
,
Daniel A. Kiefer
,
Stefan J. Rupitsch
,
Carolin Körner
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Simulation-Based Characterization of Mechanical Parameters and Thickness of Homogeneous Plates Using Guided Waves
Properties of isotropic plates in terms of material constants and thickness are characterized by making use of dispersion …
Michael Ponschab
,
Daniel A. Kiefer
,
Stefan J. Rupitsch
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Calculating the full leaky Lamb wave spectrum with exact fluid interaction
Lamb waves are elastodynamic guided waves in plates and are used for non-destructive evaluation, sensors, and material …
Daniel A. Kiefer
,
Michael Ponschab
,
Stefan J. Rupitsch
,
Michael Mayle
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Simultaneous Ultrasonic Measurement of Thickness and Speed of Sound in Elastic Plates Using Coded Excitation Signals
Layer thickness and the speed of sound are important parameters for nondestructive testing applications. If one of the parameters is …
Daniel A. Kiefer
,
Michael Fink
,
Stefan J. Rupitsch
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