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Title: Experimental study of vibration isolation in thin-walled structural assemblies with embedded total-internal-reflection metasurfaces

Abstract

The concept of total-internal-reflection elastic metasurface (TIR-MS) was recently proposed [1] and employed within flexible planar waveguides in order to create highly subwavelength sound-hard barriers impenetrable to low frequency elastic waves. The underlying physical mechanism relies on the design of engineered interfaces exhibiting extreme phase gradients such that any incoming wave at, approximately, any incidence will experience total-internal-reflection conditions. At the design frequency, the metasurface exhibits a large phase gradient such that, in accordance with the generalized Snell's law, the first critical angle is virtually always exceeded. It is worth noting that in practical realizations, the actual total reflection performance might vary depending on the angle of incidence. This dependence is due to the discrete implementation of the metasurface which results in diffraction effects. This paper presents the results of an experimental study that explores the vibration isolation performance of TIR-MS when applied to structures made of complex combinations of different elastic waveguides (e.g. bolted assemblies of beams, plates, and shells). Such system can be seen as a prototypical structure emulating mechanical assemblies of practical interest for many engineering applications. Experimental results confirm that, when the TIR-MS is embedded in the host waveguide, significant vibration isolation capabilities are achieved undermore » quasi-omnidirectional incidence and highly subwavelength excitation conditions (i.e. the ratio of the operating wavelength to the width of the TIR-MS is approximately 5.25). Furthermore, these experimental results suggest new interesting directions to achieve vibration isolation and mechanical energy filtering for practical engineering systems.« less

Authors:
 [1];  [2];  [1]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1529297
Report Number(s):
SAND-2018-10447J
Journal ID: ISSN 0022-460X; 668230
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Sound and Vibration
Additional Journal Information:
Journal Volume: 456; Journal Issue: C; Journal ID: ISSN 0022-460X
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Elastic metasurfaces; Total-internal-reflection; Structural vibration isolation

Citation Formats

Zhu, Hongfei, Walsh, Timothy F., and Semperlotti, Fabio. Experimental study of vibration isolation in thin-walled structural assemblies with embedded total-internal-reflection metasurfaces. United States: N. p., 2019. Web. doi:10.1016/j.jsv.2019.05.042.
Zhu, Hongfei, Walsh, Timothy F., & Semperlotti, Fabio. Experimental study of vibration isolation in thin-walled structural assemblies with embedded total-internal-reflection metasurfaces. United States. https://doi.org/10.1016/j.jsv.2019.05.042
Zhu, Hongfei, Walsh, Timothy F., and Semperlotti, Fabio. Thu . "Experimental study of vibration isolation in thin-walled structural assemblies with embedded total-internal-reflection metasurfaces". United States. https://doi.org/10.1016/j.jsv.2019.05.042. https://www.osti.gov/servlets/purl/1529297.
@article{osti_1529297,
title = {Experimental study of vibration isolation in thin-walled structural assemblies with embedded total-internal-reflection metasurfaces},
author = {Zhu, Hongfei and Walsh, Timothy F. and Semperlotti, Fabio},
abstractNote = {The concept of total-internal-reflection elastic metasurface (TIR-MS) was recently proposed [1] and employed within flexible planar waveguides in order to create highly subwavelength sound-hard barriers impenetrable to low frequency elastic waves. The underlying physical mechanism relies on the design of engineered interfaces exhibiting extreme phase gradients such that any incoming wave at, approximately, any incidence will experience total-internal-reflection conditions. At the design frequency, the metasurface exhibits a large phase gradient such that, in accordance with the generalized Snell's law, the first critical angle is virtually always exceeded. It is worth noting that in practical realizations, the actual total reflection performance might vary depending on the angle of incidence. This dependence is due to the discrete implementation of the metasurface which results in diffraction effects. This paper presents the results of an experimental study that explores the vibration isolation performance of TIR-MS when applied to structures made of complex combinations of different elastic waveguides (e.g. bolted assemblies of beams, plates, and shells). Such system can be seen as a prototypical structure emulating mechanical assemblies of practical interest for many engineering applications. Experimental results confirm that, when the TIR-MS is embedded in the host waveguide, significant vibration isolation capabilities are achieved under quasi-omnidirectional incidence and highly subwavelength excitation conditions (i.e. the ratio of the operating wavelength to the width of the TIR-MS is approximately 5.25). Furthermore, these experimental results suggest new interesting directions to achieve vibration isolation and mechanical energy filtering for practical engineering systems.},
doi = {10.1016/j.jsv.2019.05.042},
url = {https://www.osti.gov/biblio/1529297}, journal = {Journal of Sound and Vibration},
issn = {0022-460X},
number = C,
volume = 456,
place = {United States},
year = {2019},
month = {5}
}

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