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

• 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.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)

Nyckelord

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

Publikations- och innehållstyp

ref (ämneskategori)

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