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Methods for transfer path analysis

: Quickert, M.; Stichling, T.; Foken, W.

Boone, M.M. ; Deutsche Gesellschaft für Akustik -DEGA-, Berlin; Acoustical Society of the Netherlands:
NAG/DAGA 2009, International Conference on Acoustics. Proceedings. Vol.1 : Rotterdam, 23 - 26 March 2009; Including the 35th German Annual Conference on Acoustics (DAGA)
Berlin: DEGA, 2009
ISBN: 978-3-9808659-6-8
Deutsche Jahrestagung für Akustik (DAGA) <35, 2009, Rotterdam>
International Conference on Acoustics <2009, Rotterdam>
Fraunhofer IWU ()
Maschinenakustik; Fahrzeugakustik; Transferpfadanalyse; Geräuschanalyse; Geräuschminderung; Sounddesign; virtual prototyping

Transfer path analysis (TPA) is a well known technique to evaluate and to separate the different transfer paths describing how noise gets from the sources into the compartment of a passenger car, i.e. to the driver's ear. It is not only a measurement technique but a prediction method as well. Based on previous measurements and assumptions TPA provides the opportunity to predict the interior sound for a virtual prototype. Due to the progress in computational technology and measurement techniques, TPA is being seen as an important tool in automotive acoustic design. The paper gives a brief survey of the mathematical background of different TPA methods like the complex stiffness method or the inertance matrix method. With the help of a 3:1 scaled simplified car model differences between the methods of calculation are verified and discussed. In conclusion the paper presents the measurement setup for a real car with a dominating transfer path of the structure borne engine noise into the passenger compartment.