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The pressure field generated by a seismic airgun

Citation

de Graaf, KL and Brandner, PA and Penesis, I, The pressure field generated by a seismic airgun, Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics, 55 pp. 239-249. ISSN 0894-1777 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 Elsevier Inc.

Official URL: http://dx.doi.org/10.1016/j.expthermflusci.2...

DOI: doi:10.1016/j.expthermflusci.2014.02.025

Abstract

A model-scale seismic airgun is used to investigate the behaviour and pressure field of the bubble generated at different standoffs from a steel plate and a free surface in an open top tank. The airgun is fired at 50 and 100 bar initial pressures and the field pressure, wall pressure and wall acceleration are recorded. Wavelet and Fast Fourier Transforms are used to analyse the bubble frequency. The reduction of pressure with distance from both the initial shock and first bubble collapse are presented. The hydrodynamic component of the pressure signal generated by the bubble collapses is also discussed. The trend of the bubble period for different standoffs from the free surface is compared with other data in the literature and found to be similar. The acceleration and displacement of the steel plate are presented for varying bubble standoffs, and as the plate moves in phase with the bubble, little pressure is felt from the collapse pulses. This information provides basic understanding of the dynamics of an airgun bubble when considering their application as a method of shock testing naval ships.

Item Details

Item Type:Refereed Article
Keywords:seismic airgun; bubble dynamics; pressure field
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Maritime Engineering not elsewhere classified
Objective Division:Defence
Objective Group:Defence
Objective Field:Navy
Author:de Graaf, KL (Dr Katrina De Graaf)
Author:Brandner, PA (Associate Professor Paul Brandner)
Author:Penesis, I (Associate Professor Irene Penesis)
ID Code:91106
Year Published:2014
Web of Science® Times Cited:2
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2014-05-08
Last Modified:2017-11-01
Downloads:0

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