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On the sound absorption coefficient of porous asphalt pavements for oblique incident sound waves
| Content Provider | Semantic Scholar |
|---|---|
| Author | Bezemer-Krijnen, Marieke Wijnant, Ysbrand Hans Boer, Andries De Bekke, D. A. |
| Copyright Year | 2014 |
| Abstract | A rolling tyre radiates noise in all directions. Conventional measurement techniques for the sound absorption of road surfaces, however, only give the absorption coefficient for normal incidence. The absorption coefficient for oblique incidence is often computed assuming a locally reacting surface. 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 3D microphone array. The theory behind the measurement technique 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 as a non-locally reacting surface, which is an important characteristic for optimising the noise absorption properties of asphalt pavements and for modelling techniques. Preliminary 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 microphone array technique with impedance tube measurements. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://doc.utwente.nl/93475/1/p272.pdf |
| Alternate Webpage(s) | http://www.acoustics.asn.au/conference_proceedings/INTERNOISE2014/papers/p272.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
