Title: Analysis of the acoustic damping of an annular tail-pipe
Authors: Boonen, Rene ×
Sas, Paul
Van den Bulck, Eric #
Issue Date: 19-Sep-2012
Host Document: Proceedings of the International Conference on Noise and Vibration Engineering, ISMA 2012 pages:533-544
Conference: International Conference on Noise and Vibration Engineering, ISMA 2012 edition:2012 location:Leuven date:17-19 September 2012
Article number: 714
Abstract: A damping device combining low flow resistance with high acoustic damping has be en developed.
Such device can be applied in for example ventilation systems, turbo-engines, intake and exhaust
systems of IC-engines. The device consists of a central tube surrounded by a narrow slit. The
central tube behaves as an acoustic mass which impedance increases by frequency. This results in
an increasing acoustic flow through the slit in terms of frequency. There, its kinetic energy will be
dissipated. The properties of the device are investigated using impedance measurements using the
two microphone method on a duct setup in terms of sound pressure amplitude and an analytical
model based on an electrical equivalent circuit. The damping mechanism, consisting of viscous
damping and dissipation of flow kinetic energy behind the slit, has been analyzed analytically
including the flow distribution in the slit. This model is capable to predict the acoustic properties of
the device quite well. Acoustic absorption values of 50% are reached in this stage of the research.
ISBN: 9789073802896
Publication status: published
KU Leuven publication type: IC
Appears in Collections:Applied Mechanics and Energy Conversion Section
Production Engineering, Machine Design and Automation (PMA) Section
× corresponding author
# (joint) last author

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