Whistling potential for duct components
2013 (English)In: SAE Technical Papers: Volume 4, 2013, S A E Inc , 2013, Vol. 4, 2013-01-1889- p.Conference paper (Refereed)
Components in ducts systems that create flow separation can for certain conditions and frequencies amplify incident sound waves. This vortex-sound phenomena is the origin for whistling, i.e., the production of tonal sound at frequencies close to the resonances of a duct system. One way of predicting whistling potential is to compute the acoustic power balance, i.e., the difference between incident and scattered sound power. This can readily be obtained if the scattering matrix is known for the object. For the low frequency plane wave case this implies knowledge of the two-port data, which can be obtained by numerical and experimental methods. In this paper the procedure to experimentally determine whistling potential will be presented and some examples are given to show how this procedure can be used in some applications for automotive intake and exhaust system components.
Place, publisher, year, edition, pages
S A E Inc , 2013. Vol. 4, 2013-01-1889- p.
, SAE Technical Papers, ISSN 0148-7191 ; Vol. 4, 2013
Acoustic power, Duct systems, Incident sound waves, Intake and exhaust systems, Numerical and experimental methods, Production of, Scattering matrices, Sound power, Acoustic noise, Exhibitions, Numerical methods, Orifices, Scattering parameters, Ducts
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-134159DOI: 10.4271/2013-01-1889ScopusID: 2-s2.0-84881214908OAI: oai:DiVA.org:kth-134159DiVA: diva2:665640
SAE 2013 Noise and Vibration Conference and Exhibition, NVC 2013; Grand Rapids, MI; United States; 20 May 2013 through 23 May 2013
QC 201311202013-11-202013-11-182013-11-20Bibliographically approved