Sound radiation prediction by scale models
Sound radiation prediction by scale models
The majority of acoustic modelling has
been concerned with sound quality inside rooms and auditoria. Little attempt
has been made to model the structural stiffness of the walls. These
"rigid" walled models have given good results for auditoria but
cannot be used for vehicles etc. On the other hand the structural dynamics work
has been concerned almost exclusively with the vibration of structures in
vacuo. The coupling of the wall vibration with the enclosed space has not been
investigated thoroughly. Analytical solutions are available for a few special
cases and the finite element method is being developed for use in such coupled
problems.
It is considered that there is a need
for a technique which is able to take account of the details of the
construction of a real structure. Dynamic models could play an important part
in the advance checking of the details of new designs and may have important practical
application in developing structural modifications to produce the desired acoustical
environment.
The aim of this thesis is to verify the
possibility of predicting, by scale models, the sound pressure levels inside
enclosed structures which are mechanically excited.
The thesis is divided into two main
parts: in the first part theoretical considerations have been developed with
the aim of deriving similarity conditions between the prototype and the model.
For this purpose the wave equation in an acoustic medium and the equations of
motion of simple structures have been non-dimensionalized.
The second part is concerned with
experimental work on two models: a 1/5 scale plastic model of a safety cab of a
tractor and a simple apparatus which consists of a rigid cylindrical cavity
that is closed at one end by a flexible panel.
The first model is intended to verify
the possibility of having a prediction of the dynamic and acoustic behaviour of
the real structure comparable to that obtainable by measurements performed
directly on it.
The second apparatus has the aim of
verifying the actual possibility of using an acoustic medium different from air
but compatible with the plastic models.
University of Southampton
Pompoli, Roberto
9378ab9f-ca91-45f7-86b3-e2bab437b6df
May 1983
Pompoli, Roberto
9378ab9f-ca91-45f7-86b3-e2bab437b6df
Clarkson, B.L.
30909020-e0fa-43ba-b19e-81b2f3be26e1
Pompoli, Roberto
(1983)
Sound radiation prediction by scale models.
University of Southampton, Institute of Sound and Vibration Research, Doctoral Thesis, 243pp.
Record type:
Thesis
(Doctoral)
Abstract
The majority of acoustic modelling has
been concerned with sound quality inside rooms and auditoria. Little attempt
has been made to model the structural stiffness of the walls. These
"rigid" walled models have given good results for auditoria but
cannot be used for vehicles etc. On the other hand the structural dynamics work
has been concerned almost exclusively with the vibration of structures in
vacuo. The coupling of the wall vibration with the enclosed space has not been
investigated thoroughly. Analytical solutions are available for a few special
cases and the finite element method is being developed for use in such coupled
problems.
It is considered that there is a need
for a technique which is able to take account of the details of the
construction of a real structure. Dynamic models could play an important part
in the advance checking of the details of new designs and may have important practical
application in developing structural modifications to produce the desired acoustical
environment.
The aim of this thesis is to verify the
possibility of predicting, by scale models, the sound pressure levels inside
enclosed structures which are mechanically excited.
The thesis is divided into two main
parts: in the first part theoretical considerations have been developed with
the aim of deriving similarity conditions between the prototype and the model.
For this purpose the wave equation in an acoustic medium and the equations of
motion of simple structures have been non-dimensionalized.
The second part is concerned with
experimental work on two models: a 1/5 scale plastic model of a safety cab of a
tractor and a simple apparatus which consists of a rigid cylindrical cavity
that is closed at one end by a flexible panel.
The first model is intended to verify
the possibility of having a prediction of the dynamic and acoustic behaviour of
the real structure comparable to that obtainable by measurements performed
directly on it.
The second apparatus has the aim of
verifying the actual possibility of using an acoustic medium different from air
but compatible with the plastic models.
Text
Pompoli 1983 Thesis
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More information
Published date: May 1983
Organisations:
University of Southampton
Identifiers
Local EPrints ID: 52331
URI: http://eprints.soton.ac.uk/id/eprint/52331
PURE UUID: 5079eadd-0a5a-45fa-b0f7-2db9b896cc7f
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Date deposited: 27 Aug 2008
Last modified: 15 Mar 2024 10:33
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Contributors
Author:
Roberto Pompoli
Thesis advisor:
B.L. Clarkson
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