A technique for the assessment of strength of coupling between statistical energy analysis subsystems
A technique for the assessment of strength of coupling between statistical energy analysis subsystems
One of the main requirements for the successful use of traditional Statistical Energy Analysis (SEA) is to select weakly coupled subsystems. In particular, the method of energy matrix inversion to determine loss factors by experiment can be subject to serious error if subsystems are strongly coupled.
The objective of this research is to develop a simple and rapid experimental test of coupling strength in a SEA sense. On the basis of Langley's definition of weak coupling, a convenient way to assess the strength of coupling is described through theoretical and experimental studies of one-, two- and three-dimensional coupled subsystems. It appears that, in case of resonant coupling, when one subsystem is subject to impulsive excitation, the time delay in the rise of the kinetic energy in the indirectly excited subsystem can be used to define an effective indicator of strength of coupling. This indicator, CS, can be used on assembled structures prior to a SEA analysis and gives an absolute scale of strength of coupling for the systems studied. However, the requirement of resonant coupling for CS to be valid could be a major shortcoming if any attempt is made to apply SEA to systems with low modal density. Therefore, on the basis of a theoretical model of energy impulse response, a statistical indicator of resonant coupling named Mp is proposed. Although further investigations are necessary to validate Mp, both indicator CS and MP used together should provide a reliable assessment of strength of coupling in a SEA sense.
University of Southampton
1997
James, Philippe Pierre
(1997)
A technique for the assessment of strength of coupling between statistical energy analysis subsystems.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
One of the main requirements for the successful use of traditional Statistical Energy Analysis (SEA) is to select weakly coupled subsystems. In particular, the method of energy matrix inversion to determine loss factors by experiment can be subject to serious error if subsystems are strongly coupled.
The objective of this research is to develop a simple and rapid experimental test of coupling strength in a SEA sense. On the basis of Langley's definition of weak coupling, a convenient way to assess the strength of coupling is described through theoretical and experimental studies of one-, two- and three-dimensional coupled subsystems. It appears that, in case of resonant coupling, when one subsystem is subject to impulsive excitation, the time delay in the rise of the kinetic energy in the indirectly excited subsystem can be used to define an effective indicator of strength of coupling. This indicator, CS, can be used on assembled structures prior to a SEA analysis and gives an absolute scale of strength of coupling for the systems studied. However, the requirement of resonant coupling for CS to be valid could be a major shortcoming if any attempt is made to apply SEA to systems with low modal density. Therefore, on the basis of a theoretical model of energy impulse response, a statistical indicator of resonant coupling named Mp is proposed. Although further investigations are necessary to validate Mp, both indicator CS and MP used together should provide a reliable assessment of strength of coupling in a SEA sense.
This record has no associated files available for download.
More information
Published date: 1997
Identifiers
Local EPrints ID: 463309
URI: http://eprints.soton.ac.uk/id/eprint/463309
PURE UUID: 0e78f1c2-1958-4ae4-a8e1-314779f747b2
Catalogue record
Date deposited: 04 Jul 2022 20:49
Last modified: 04 Jul 2022 20:49
Export record
Contributors
Author:
Philippe Pierre James
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics