Search Results - "Kiefer, Daniel A."

Computing zero-group-velocity points in anisotropic elastic waveguides: Globally and locally convergent methods by Kiefer, Daniel A., Plestenjak, Bor, Gravenkamp, Hauke, Prada, Claire

“…Dispersion curves of elastic waveguides exhibit points where the group velocity vanishes while the wavenumber remains finite. These are the so-called…”
Get full text

Comparison of Transmission Measurement Methods of Elastic Waves in Phononic Band Gap Materials by Wormser, Maximilian, Kiefer, Daniel A, Rupitsch, Stefan J, Körner, Carolin

“…Periodic cellular structures can exhibit metamaterial properties, such as phononic band gaps. In order to detect these frequency bands of strong wave…”
Get full text

Notes on osculations and mode tracing in semi-analytical waveguide modeling by Gravenkamp, Hauke, Plestenjak, Bor, Kiefer, Daniel A.

“…The dispersion curves of (elastic) waveguides frequently exhibit crossings and osculations (also known as veering, repulsion, or avoided crossing). Osculations…”
Get full text

Calculating the full leaky Lamb wave spectrum with exact fluid interaction by Kiefer, Daniel A., Ponschab, Michael, Rupitsch, Stefan J., Mayle, Michael

“…Lamb waves are elastodynamic guided waves in plates and are used for non-destructive evaluation, sensors, and material characterization. These applications…”
Get full text

Transit Time of Lamb Wave-Based Ultrasonic Flow Meters and the Effect of Temperature by Kiefer, Daniel A., Benkert, Andreas, Rupitsch, Stefan J.

“…Transit-time flow meters need to compensate for cross-sensitivity to temperature. We show that Lamb wave-based setups are less affected by temperature. An…”
Get full text

Beating resonance patterns and extreme power flux skewing in anisotropic elastic plates by Kiefer, Daniel A, Mezil, Sylvain, Prada, Claire

“…Elastic waves in anisotropic media can exhibit a power flux that is not collinear with the wave vector. This has notable consequences for waves guided in a…”
Get full text

Simulation-Based Characterization of Mechanical Parameters and Thickness of Homogeneous Plates Using Guided Waves by Ponschab, Michael, Kiefer, Daniel A., Rupitsch, Stefan J.

“…Properties of isotropic plates in terms of material constants and thickness are characterized by making use of dispersion characteristics of propagating Lamb…”
Get full text

Simultaneous Ultrasonic Measurement of Thickness and Speed of Sound in Elastic Plates Using Coded Excitation Signals by Kiefer, Daniel A., Fink, Michael, Rupitsch, Stefan J.

“…Layer thickness and the speed of sound are important parameters for nondestructive testing applications. If one of the parameters is known, the other one can…”
Get full text

Extreme wave skewing and dispersion spectra of anisotropic elastic plates by Kiefer, Daniel A, Mezil, Sylvain, Prada, Claire

“…Guided wave dispersion is commonly assessed by Fourier analysis of the field along a line, resulting in frequency-wavenumber dispersion curves. In anisotropic…”
Get full text

Computation of leaky waves in layered structures coupled to unbounded media by exploiting multiparameter eigenvalue problems by Gravenkamp, Hauke, Plestenjak, Bor, Kiefer, Daniel A., Jarlebring, Elias

“…We present a semi-analytical approach to compute quasi-guided elastic wave modes in horizontally layered structures radiating into unbounded fluid or solid…”
Get full text

Towards an Inverse Characterization of Third Order Elastic Constants Using Guided Waves by Ponschab, Michael, Kiefer, Daniel A., Rupitsch, Stefan J.

“…The acoustoelastic effect describes the change in propagation velocities of elastic waves due to mechanical prestress and is based on geometric and material…”
Get full text

Calculating the full leaky Lamb wave dispersion characteristics by Kiefer, Daniel A., Ponschab, Michael, Rupitsch, Stefan J.

“…Lamb waves are mechanical waves guided in a plate with stress-free boundaries. In practice, the plate is often in contact with a fluid. The propagation of…”
Get full text

A Sylvester equation approach for the computation of zero-group-velocity points in waveguides by Plestenjak, Bor, Kiefer, Daniel A, Gravenkamp, Hauke

“…Eigenvalues of parameter-dependent quadratic eigenvalue problems form eigencurves. The critical points on these curves, where the derivative vanishes, are of…”
Get full text

Beating resonance patterns and extreme power flux skewing in anisotropic elastic plates by Kiefer, Daniel A, Mezil, Sylvain, Prada, Claire

“…Science Advances, 9 (51), p. eadk6846, Dec. 2023 Elastic waves in anisotropic media can exhibit a power flux that is not collinear with the wave vector. This…”
Get full text

Computation of leaky waves in layered structures coupled to unbounded media by exploiting multiparameter eigenvalue problems by Gravenkamp, Hauke, Plestenjak, Bor, Kiefer, Daniel A, Jarlebring, Elias

“…We present a semi-analytical approach to compute quasi-guided elastic wave modes in horizontally layered structures radiating into unbounded fluid or solid…”
Get full text

Supersonic shear wave imaging in stretched soft strips: modeling for quantitative elastography by Delory, Alexandre, Kiefer, Daniel A, Prada, Claire, Lemoult, Fabrice

“…Objective - Shear wave elastography has enriched ultrasound medical imaging with quantitative measurements of tissue stiffness. However, this method still…”
Get full text

Notes on osculations and mode tracing in semi-analytical waveguide modeling by Gravenkamp, Hauke, Plestenjak, Bor, Kiefer, Daniel A

“…Ultrasonics, vol. 135, p. 107112, 2023 The dispersion curves of (elastic) waveguides frequently exhibit crossings and osculations (also known as veering,…”
Get full text

Viscoelastic dynamics of a soft strip subject to a large deformation by Delory, Alexandre, Kiefer, Daniel A, Lanoy, Maxime, Eddi, Antonin, Prada, Claire, Lemoult, Fabrice

“…To produce sounds, we adjust the tension of our vocal folds to shape their properties and control the pitch. This efficient mechanism offers inspiration for…”
Get full text

Computing zero-group-velocity points in anisotropic elastic waveguides: Globally and locally convergent methods by Kiefer, Daniel A, Plestenjak, Bor, Gravenkamp, Hauke, Prada, Claire

“…The Journal of the Acoustical Society of America, vol. 153, no. 2, pp. 1386-1398, Feb. 2023 Dispersion curves of elastic waveguides exhibit points where the…”
Get full text