University of Southampton OCS (beta), RASD 2013 11th International Conference on Recent Advances in Structural Dynamics 1st – 3rd July 2013

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A COMPARISON OF TWO IN-SITU TRANSFER PATH ANALYSIS METHODS
Nikolaos Zafeiropoulos, Andy Moorhouse, Andrew Mackay, Uday Senapati

Last modified: 2013-05-19

Abstract


The need for improving fuel eciency and driving dynamics has an eect on modern vehiclesstructures. Currently most of them are assembled by various mechanical parts, likesuspension systems, mounts, chassis and body structure that dier in terms of structural dynamics.The integration of all these parts results in a mechanical system that can be proneto structureborne noise. Advanced vibro-acoustic measurement techniques are used to identifythe structural sources that cause the low frequency noise in the compartment. There areadvantages in methods not requiring disassembly of the vehicle structure, e.g. OTPA, iTPA(in-situ TPA) the latter has been also proven recently to provide reliable results on vehiclesand other complex structure. Here another Transfer Path Analysis approach is investigatedthat does not require any physical blocking or disassembling of the structure. The conceptof blocked transfer paths was proposed by F. X. Magrans in the early ’80s and is referredas Advanced Transfer Path Analysis (ATPA). This method allows the identification of thetransfer paths between two parts of the vibro-acoustic system under blocked conditions at theinterface between the source and the receiver structures. Therefore this method is potentiallya useful tool for structureborne noise analysis in vehicles, where many tests are necessaryfor identifying the structural characteristics of individual transfer paths that contribute to thenoise in the compartment. The validity of ATPA is compared with experimental results fromiTPA that were obtained from a beam-plate structure.


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