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Surface vibration propagation over a layered elastic half-space with an inclusion

Peplow, A. T. LU orcid ; Jones, C. J.C. and Petyt, M. (1999) In Applied Acoustics 56(4). p.283-296
Abstract

The transmission of vibrations, and its reduction, in the far-field of the surface of the ground due to a harmonic load acting over a strip, is investigated theoretically. A possible vibration attenuation device that has shown some promise is the "wave impedance block" (WIB). The principle of this is to modify the modal wave propagation regime of the ground by introducing an artificial stiffened layer (inclusion) under the load. The ground is modelled as an elastic layered half-space and the inclusion is under the load within the layered half-space. The performance of the inclusion in impeding wave transmissions at a number of receiver positions is studied and measured in terms of insertion loss analogous to the study of noise barrier... (More)

The transmission of vibrations, and its reduction, in the far-field of the surface of the ground due to a harmonic load acting over a strip, is investigated theoretically. A possible vibration attenuation device that has shown some promise is the "wave impedance block" (WIB). The principle of this is to modify the modal wave propagation regime of the ground by introducing an artificial stiffened layer (inclusion) under the load. The ground is modelled as an elastic layered half-space and the inclusion is under the load within the layered half-space. The performance of the inclusion in impeding wave transmissions at a number of receiver positions is studied and measured in terms of insertion loss analogous to the study of noise barrier designs in outdoor sound propagation. A numerical model is presented which enables the wave-field in the region of the inclusion to be determined. This is based on an integral equation formulation of the problem which is solved using a boundary element approach. It is shown that an inclusion has a beneficial effect at low frequencies. However, when the wavelength becomes short compared with the depth and width of the inclusion, adverse effects occur at some frequencies which are still observed in the far-field. The possible causes are difficult to analyse as radiation, scattering and transmission of the shear and compression waves due to the inclusion must be taken into account. Various configurations of inclusion are studied and results presented so that some preliminary conclusions may be derived.

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author
; and
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Acoustics
volume
56
issue
4
pages
14 pages
publisher
Elsevier
external identifiers
  • scopus:0005269286
ISSN
0003-682X
DOI
10.1016/S0003-682X(98)00031-0
language
English
LU publication?
no
additional info
Funding Information: This work has been carried out under EPSRC grants (GR/H39895) and (GR/L11397) in collaboration with BR Research, Derby, UK. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
id
e54e0931-778b-4f31-a8e5-0b2a6b67a6f4
date added to LUP
2021-03-08 15:22:21
date last changed
2022-04-19 05:12:16
@article{e54e0931-778b-4f31-a8e5-0b2a6b67a6f4,
  abstract     = {{<p>The transmission of vibrations, and its reduction, in the far-field of the surface of the ground due to a harmonic load acting over a strip, is investigated theoretically. A possible vibration attenuation device that has shown some promise is the "wave impedance block" (WIB). The principle of this is to modify the modal wave propagation regime of the ground by introducing an artificial stiffened layer (inclusion) under the load. The ground is modelled as an elastic layered half-space and the inclusion is under the load within the layered half-space. The performance of the inclusion in impeding wave transmissions at a number of receiver positions is studied and measured in terms of insertion loss analogous to the study of noise barrier designs in outdoor sound propagation. A numerical model is presented which enables the wave-field in the region of the inclusion to be determined. This is based on an integral equation formulation of the problem which is solved using a boundary element approach. It is shown that an inclusion has a beneficial effect at low frequencies. However, when the wavelength becomes short compared with the depth and width of the inclusion, adverse effects occur at some frequencies which are still observed in the far-field. The possible causes are difficult to analyse as radiation, scattering and transmission of the shear and compression waves due to the inclusion must be taken into account. Various configurations of inclusion are studied and results presented so that some preliminary conclusions may be derived.</p>}},
  author       = {{Peplow, A. T. and Jones, C. J.C. and Petyt, M.}},
  issn         = {{0003-682X}},
  language     = {{eng}},
  number       = {{4}},
  pages        = {{283--296}},
  publisher    = {{Elsevier}},
  series       = {{Applied Acoustics}},
  title        = {{Surface vibration propagation over a layered elastic half-space with an inclusion}},
  url          = {{http://dx.doi.org/10.1016/S0003-682X(98)00031-0}},
  doi          = {{10.1016/S0003-682X(98)00031-0}},
  volume       = {{56}},
  year         = {{1999}},
}