On the sound absorption coefficient of porous asphalt pavements for oblique incident sound waves

Marieke Bezemer-Krijnen, Ysbrand H. Wijnant, Andries de Boer, Dirk Bekke

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

4 Citations (Scopus)
125 Downloads (Pure)


A rolling tyre will radiate noise in all directions. However, conventional measurement techniques for the sound absorption of surfaces only give the absorption coefficient for normal incidence. In this paper, a measurement technique is described with which it is possible to perform in situ sound absorption measurements for oblique incidence. The measurements are performed with a small microphone array, the 8p-probe, and the theory is based on the local plane wave assumption. In this paper, an approach is proposed to determine whether a surface behaves as a locally reacting surface or a nonlocally reacting surface, which is an important characteristic for optimising asphalt pavements for noise reduction and for modelling techniques. Measurements at various angles of incidence are performed to demonstrate this approach as well as measurements of the absorption coefficient at normal incidence to validate the 8p-probe with impedance tube measurements.
Original languageEnglish
Title of host publicationInternoise 2014
EditorsJ. Davy, Ch. Don, T. McMinn, L. Dowsett, N. Broner, M. Burgess
Place of PublicationMelbourne
PublisherThe Australian Acoustical Society
ISBN (Print)978-0-909882-03-7
Publication statusPublished - 16 Nov 2014
Eventinter.noise 2014, Melbourne, 16-19 November 2014 - Melbourne
Duration: 16 Nov 201419 Nov 2014

Publication series

PublisherThe Australian Acoustical Society


Conferenceinter.noise 2014, Melbourne, 16-19 November 2014
Other16-11-2014 - 19-11-2014


  • METIS-304625
  • IR-93475


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