Experimental measurement of acoustic properties by a two source method with simultaneous excitation

QC 20140910
In this work, an experimental technique is presented for the acoustic characterization of materials and devices. The developed technique is based on the two source method with simultaneous excitation, thus reducing the time requirements in comparison with the standard two source technique. A decomposition technique is applied to the pressure measurements associated with each microphone, that include noise of two sources acting simultaneously, and the input signals used to excite the two sources. The procedure allows the calculation of the transfer functions between each microphone and each input separately. Once the individual transfer functions have been obtained, it is possible to characterize an acoustic device by means of its four-pole matrix as well as its transmission loss. The technique has been validated by comparison with theoretical results and experimental methods of earlier studies, for several test cases including a straight duct and a reactive muffler.

TEKNIK OCH TEKNOLOGIER Maskinteknik Strömningsmekanik och akustik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Fluid Mechanics and Acoustics hsv//eng
Acoustic characterization
Decomposition technique
Experimental measurements
Experimental methods
Experimental techniques
Straight duct
Test case
Theoretical result
Time requirements
Transmission loss
Two sources
Microphones
Transfer functions
Acoustic properties

Denia, F. D. (author)
Fuenmayor, F. J. (author)
Åbom, MatsKTH,MWL Marcus Wallenberg Laboratoriet,Competence Center for Gas Exchange (CCGEx)(Swepub:kth)u1zej4e9 (author)
KTHMWL Marcus Wallenberg Laboratoriet (creator_code:org_t)

In:18th International Congress on Sound and Vibration 2011, ICSV 2011, s. 879-8869781618392596

By the author/editor: Pedrosa, A. M.; Denia, F. D.; Fuenmayor, F. J.; Åbom, Mats

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Fluid Mechanics ...

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