Dynamic behavior of a zero-group velocity guided mode in rail structures

Yuning Wu; Keping Zhang; Peng Zhang; Xuan Zhu; John S. Popovics

doi:10.1121/10.0021186

Dynamic behavior of a zero-group velocity guided mode in rail structures

Yuning Wu, Keping Zhang, Peng Zhang, Xuan Zhu, John S. Popovics

Research output: Contribution to journal › Article › peer-review

Abstract

Important characteristics of a zero-group velocity (ZGV) mode in a standard rail are investigated through numerical simulation and experiment. First, the semi-analytical finite element analysis is implemented to compute dispersion curves for the rail structure and the first ZGV point is identified. Backward waves are identified through opposing senses of group and phase velocities. Next, a time-dependent finite element model is used to understand the dynamic response of the rail. Finally, experimental measurements confirm that ZGV modes in rail structures are formed through interferences between two opposite-traveling waves, which is analogous to the S1-S2b ZGV Lamb mode in plate structures.

Original language	English (US)
Article number	105601
Journal	JASA Express Letters
Volume	3
Issue number	10
DOIs	https://doi.org/10.1121/10.0021186
State	Published - Oct 1 2023

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Music
Arts and Humanities (miscellaneous)
Acoustics and Ultrasonics

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10.1121/10.0021186

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abstract = "Important characteristics of a zero-group velocity (ZGV) mode in a standard rail are investigated through numerical simulation and experiment. First, the semi-analytical finite element analysis is implemented to compute dispersion curves for the rail structure and the first ZGV point is identified. Backward waves are identified through opposing senses of group and phase velocities. Next, a time-dependent finite element model is used to understand the dynamic response of the rail. Finally, experimental measurements confirm that ZGV modes in rail structures are formed through interferences between two opposite-traveling waves, which is analogous to the S1-S2b ZGV Lamb mode in plate structures.",

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AB - Important characteristics of a zero-group velocity (ZGV) mode in a standard rail are investigated through numerical simulation and experiment. First, the semi-analytical finite element analysis is implemented to compute dispersion curves for the rail structure and the first ZGV point is identified. Backward waves are identified through opposing senses of group and phase velocities. Next, a time-dependent finite element model is used to understand the dynamic response of the rail. Finally, experimental measurements confirm that ZGV modes in rail structures are formed through interferences between two opposite-traveling waves, which is analogous to the S1-S2b ZGV Lamb mode in plate structures.

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Dynamic behavior of a zero-group velocity guided mode in rail structures

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