Guided wave propagation in three-layer pavement structures
(2004) In Journal of the Acoustical Society of America 116(5). p.2902-2913- Abstract
- A study on guided waves in a. layered half-space with large velocity contrasts and a decreasing velocity with depth is presented. Multiple mode dispersion curves are calculated in the complex wave number domain, taking into consideration the attenuation caused by leakage into the underlying half-space. The excitability of the modes by a vertical point force on the surface is also calculated. Results show that the measurable wave field at the surface of a pavement structure is dominated by leaky quasi-Lamb waves in the top and second layers. The fundamental antisymmetric mode of vibration is the dominating mode generated in the stiff top layer. This mode drives the complete system and continuity across the boundaries generates higher order... (More)
- A study on guided waves in a. layered half-space with large velocity contrasts and a decreasing velocity with depth is presented. Multiple mode dispersion curves are calculated in the complex wave number domain, taking into consideration the attenuation caused by leakage into the underlying half-space. The excitability of the modes by a vertical point force on the surface is also calculated. Results show that the measurable wave field at the surface of a pavement structure is dominated by leaky quasi-Lamb waves in the top and second layers. The fundamental antisymmetric mode of vibration is the dominating mode generated in the stiff top layer. This mode drives the complete system and continuity across the boundaries generates higher order modes in the embedded second layer. The interaction of leaky Lamb waves in the first two layers results in large variations in the excitability and the attenuation, so that only the waves corresponding to certain portions of the dispersion curves are measurable remote from the source at the pavement surface. It is concluded that these portions of dispersion curves can be individually resolved in practice, by using multichannel processing techniques. This holds the potential for a refined nondestructive testing technique for pavements. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/259823
- author
- Rydén, Nils LU and Lowe, MJS
- organization
- publishing date
- 2004
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of the Acoustical Society of America
- volume
- 116
- issue
- 5
- pages
- 2902 - 2913
- publisher
- American Institute of Physics (AIP)
- external identifiers
-
- wos:000225331500021
- scopus:9644291574
- ISSN
- 1520-8524
- DOI
- 10.1121/1.1808223
- language
- English
- LU publication?
- yes
- id
- 4becca48-c180-4247-a876-624832abe279 (old id 259823)
- date added to LUP
- 2016-04-01 15:53:28
- date last changed
- 2022-04-22 18:10:50
@article{4becca48-c180-4247-a876-624832abe279,
abstract = {{A study on guided waves in a. layered half-space with large velocity contrasts and a decreasing velocity with depth is presented. Multiple mode dispersion curves are calculated in the complex wave number domain, taking into consideration the attenuation caused by leakage into the underlying half-space. The excitability of the modes by a vertical point force on the surface is also calculated. Results show that the measurable wave field at the surface of a pavement structure is dominated by leaky quasi-Lamb waves in the top and second layers. The fundamental antisymmetric mode of vibration is the dominating mode generated in the stiff top layer. This mode drives the complete system and continuity across the boundaries generates higher order modes in the embedded second layer. The interaction of leaky Lamb waves in the first two layers results in large variations in the excitability and the attenuation, so that only the waves corresponding to certain portions of the dispersion curves are measurable remote from the source at the pavement surface. It is concluded that these portions of dispersion curves can be individually resolved in practice, by using multichannel processing techniques. This holds the potential for a refined nondestructive testing technique for pavements.}},
author = {{Rydén, Nils and Lowe, MJS}},
issn = {{1520-8524}},
language = {{eng}},
number = {{5}},
pages = {{2902--2913}},
publisher = {{American Institute of Physics (AIP)}},
series = {{Journal of the Acoustical Society of America}},
title = {{Guided wave propagation in three-layer pavement structures}},
url = {{http://dx.doi.org/10.1121/1.1808223}},
doi = {{10.1121/1.1808223}},
volume = {{116}},
year = {{2004}},
}