Performance Comparison of the Forward and Inverse Metawedge for Ground-Borne Vibration Mitigation

Conference Paper (2024)
Author(s)

A.B. Farăgău (TU Delft - Dynamics of Structures)

S. van Gaal (Cohere Consultants)

Eliam Vlijm (Cohere Consultants)

A. Metrikine (TU Delft - Engineering Structures, TU Delft - Hydraulic Engineering)

Apostolos Tsouvalas (TU Delft - Offshore Engineering, TU Delft - Dynamics of Structures)

K.N. van Dalen (TU Delft - Dynamics of Structures)

Research Group
Dynamics of Structures
DOI related publication
https://doi.org/10.4203/ccc.7.13.8
More Info
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Publication Year
2024
Language
English
Research Group
Dynamics of Structures
Bibliographical Note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. @en
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Abstract

This study examines the impact of railway-induced ground-borne vibrations on nearby structures and residents, focusing on the effectiveness of the metawedge, a novel mitigation measure. The metawedge consists of a series of periodically arranged resonators along the propagation path, either placed on the ground surface or embedded at various depths. Unlike classical locally-resonant metamaterials, the metawedge features resonators with smoothly varying resonance frequencies in the longitudinal direction. Two metawedge designs, the forward and inverse metawedge, have been proposed in the literature. Despite their similarities, they operate on different principles: the forward metawedge decelerates incoming surface waves, localizing energy, while the inverse metawedge accelerates the waves, converting Rayleigh waves into body waves. This study compares the performance of both designs in mitigating train-induced ground-borne vibrations. Results indicate that both the forward and inverse metawedge exhibit remarkably similar performance for the specific design adopted. If this similarity holds across different designs, it offers engineers flexibility in choosing the appropriate measure based on practical needs. More generally, this work demonstrates the potential and feasibility of using metamaterials to address current and future challenges in railway transportation.

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