Array and subtraction methods for characterising vehicle power train noise - an investigation for the European Harmonoise project
conference paper
Within the European Harmonoise project, part funded by the EC to develop a state-of-the-art prediction model for rail and road traffic, there is a need to determine power train noise and the effective heights of vehicle sources. Microphone array methods have the potential to provide both source sound exposure levels (SEL) and heights while subtraction methods allow a precise determination of SEL for tyre/road noise and power train noise but not effective heights. Tests were conducted at TRL to determine the accuracy of two array methods developed by TNO by comparison with the subtraction method and also to enable source positions to be determined for light and heavy vehicles. One array was in the form of an inverted T-shape (Acoustic Camera) with overall height of 1.5 m. The other was a 9.5 m long linear array (Syntacan) held in a vertical position. The subtraction method involved coast-by and cruise-by measurements at very similar vehicle speeds. Measurements were made on a surface conforming to ISO 10844, a porous surface (MARS6) and a hot rolled asphalt surface (HRA) which is commonly used on the UK road network. Test vehicles included two cars and two trucks. It was shown that there was good agreement between the three methods and that the array methods could be used to inform decisions about appropriate source heights for the light and heavy vehicles.
Topics
TNO Identifier
986227
ISSN
0308437X
Source title
Inter-noise 2003, 32nd International Congress and Exposition on Noise Control Engineering, Seogwipo, Korea,
25-28 August 2003
25-28 August 2003
Collation
2 p.
Pages
3219-3220
Files
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