Acoustic power flow in fluid filled tubes and cavities
Acoustic power flow in fluid filled tubes and cavities
Sea going vessels contain a multitude of hydraulic systems: cooling pumps/circuits, sewage pumps, and refuse ejectors, to name but a few, all of which may consist of many interconnected tubes and cavities. Many of these systems run continuously, contributing to the steady state radiated noise from the vessel into the water, while some of the systems run intermittently and generate transients with a noise level far exceeding this background noise level. Often the acoustic power is concentrated at the lower frequencies which propagate long distances in water. These signals may also be highly directional, depending on both the source positioning within the structure and the location of the transmission paths. In order to model such systems, it is necessary to gain a basic understanding of the mechanisms of acoustic energy transmission through fluid filled tube/cavity type systems, and to be able to model them mathematically. The potential for transient as well as steady state solutions is desirable. A theoretical investigation has been carried out into the nature of the acoustic field within fluid filled tubes and cavities subject to a localized excitation within the fluid. Particular attention has been paid to damping. The theoretical models are based on the coupling of simple one-dimensional tube-like systems. A model has been developed which allows cavities to be modelled as the summation of many one-dimensional systems. The method, in principle, allows both transient and steady state analyses to be undertaken. An anechoic lining has been designed for the water tank in which acoustic measurements were to be taken. In-air and in-water measurements taken in the anechoic water tank have been made to validate the theoretical models.
University of Southampton
Muggleton, Jennifer Margaret
5cb9bda2-db05-41f1-9655-e77eb974c249
1992
Muggleton, Jennifer Margaret
5cb9bda2-db05-41f1-9655-e77eb974c249
Muggleton, Jennifer Margaret
(1992)
Acoustic power flow in fluid filled tubes and cavities.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Sea going vessels contain a multitude of hydraulic systems: cooling pumps/circuits, sewage pumps, and refuse ejectors, to name but a few, all of which may consist of many interconnected tubes and cavities. Many of these systems run continuously, contributing to the steady state radiated noise from the vessel into the water, while some of the systems run intermittently and generate transients with a noise level far exceeding this background noise level. Often the acoustic power is concentrated at the lower frequencies which propagate long distances in water. These signals may also be highly directional, depending on both the source positioning within the structure and the location of the transmission paths. In order to model such systems, it is necessary to gain a basic understanding of the mechanisms of acoustic energy transmission through fluid filled tube/cavity type systems, and to be able to model them mathematically. The potential for transient as well as steady state solutions is desirable. A theoretical investigation has been carried out into the nature of the acoustic field within fluid filled tubes and cavities subject to a localized excitation within the fluid. Particular attention has been paid to damping. The theoretical models are based on the coupling of simple one-dimensional tube-like systems. A model has been developed which allows cavities to be modelled as the summation of many one-dimensional systems. The method, in principle, allows both transient and steady state analyses to be undertaken. An anechoic lining has been designed for the water tank in which acoustic measurements were to be taken. In-air and in-water measurements taken in the anechoic water tank have been made to validate the theoretical models.
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Published date: 1992
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Local EPrints ID: 461664
URI: http://eprints.soton.ac.uk/id/eprint/461664
PURE UUID: f8d6591a-4c9d-41d7-8d43-4544f5b514c5
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Date deposited: 04 Jul 2022 18:51
Last modified: 16 Mar 2024 18:50
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Author:
Jennifer Margaret Muggleton
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