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Modelling and measurement of backscattering from partially water-filled cylindrical shells

Modelling and measurement of backscattering from partially water-filled cylindrical shells
Modelling and measurement of backscattering from partially water-filled cylindrical shells
The backscattering from partially water-filled cylindrical shells has been studied using finite element (FE) analysis and experimental measurements for low to medium frequencies, corresponding to 2 < ka < 30 (where a is the shell outer radius). For a partially-filled shell, filled to three quarters of the inner diameter, backscattering has been investigated numerically as a function of the elevation angle of the incident wave, and in particular as the wave direction changes from horizontal to vertical. Comparisons with fully air-filled and fully water-filled shells indicate that the shell resembles the former when the wave is incident from above and the latter when the wave is incident horizontally. The experiments were performed in a reservoir, using horizontal incidence and wideband Ricker pulses generated by a parametric array. The short duration of the Ricker pulses made it possible to observe a number of returns after the specular return for a shell with a high filling fraction; these included contributions due to S0 waves generated at the front and back walls of the shell, and the back wall return. Inversion of the FE model data enabled the expected waveforms to be predicted; the measurements were in very good agreement with the predictions
partially water-filled, cylindrical shell, backscatter
Humphrey, Victor
23c9bd0c-7870-428f-b0dd-5ff158d22590
Wang, Lian Sheng
cabec9ee-381a-44f4-b530-1503895e38f8
Jayasundere, Nisabha
272e9b68-6466-4290-ab2d-399eaecf63cf
Papdakis, J.S.
7e40257e-ff64-4bcb-99ec-dc296d1aa170
Bjorno, L.
18b63f9f-1092-40b2-a306-36664cccfc45
Humphrey, Victor
23c9bd0c-7870-428f-b0dd-5ff158d22590
Wang, Lian Sheng
cabec9ee-381a-44f4-b530-1503895e38f8
Jayasundere, Nisabha
272e9b68-6466-4290-ab2d-399eaecf63cf
Papdakis, J.S.
7e40257e-ff64-4bcb-99ec-dc296d1aa170
Bjorno, L.
18b63f9f-1092-40b2-a306-36664cccfc45

Humphrey, Victor, Wang, Lian Sheng and Jayasundere, Nisabha (2009) Modelling and measurement of backscattering from partially water-filled cylindrical shells. Papdakis, J.S. and Bjorno, L. (eds.) Third International Conference on Underwater Acoustic Measurements, Technologies and Results, Nafplion, Greece. 20 - 25 Jun 2009. 8 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

The backscattering from partially water-filled cylindrical shells has been studied using finite element (FE) analysis and experimental measurements for low to medium frequencies, corresponding to 2 < ka < 30 (where a is the shell outer radius). For a partially-filled shell, filled to three quarters of the inner diameter, backscattering has been investigated numerically as a function of the elevation angle of the incident wave, and in particular as the wave direction changes from horizontal to vertical. Comparisons with fully air-filled and fully water-filled shells indicate that the shell resembles the former when the wave is incident from above and the latter when the wave is incident horizontally. The experiments were performed in a reservoir, using horizontal incidence and wideband Ricker pulses generated by a parametric array. The short duration of the Ricker pulses made it possible to observe a number of returns after the specular return for a shell with a high filling fraction; these included contributions due to S0 waves generated at the front and back walls of the shell, and the back wall return. Inversion of the FE model data enabled the expected waveforms to be predicted; the measurements were in very good agreement with the predictions

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More information

Published date: June 2009
Additional Information: Paper 31-2
Venue - Dates: Third International Conference on Underwater Acoustic Measurements, Technologies and Results, Nafplion, Greece, 2009-06-20 - 2009-06-25
Keywords: partially water-filled, cylindrical shell, backscatter

Identifiers

Local EPrints ID: 79116
URI: http://eprints.soton.ac.uk/id/eprint/79116
PURE UUID: 87cd4189-1810-4d19-afd7-1cf25857e934
ORCID for Victor Humphrey: ORCID iD orcid.org/0000-0002-3580-5373

Catalogue record

Date deposited: 19 Mar 2010
Last modified: 11 Dec 2021 03:54

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Contributors

Author: Victor Humphrey ORCID iD
Author: Lian Sheng Wang
Author: Nisabha Jayasundere
Editor: J.S. Papdakis
Editor: L. Bjorno

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