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Calibrating the ISO 10844 test surfaces used for vehicle and tyre noise testing
Swedish National Road and Transport Research Institute, Society, environment and transport, Environment.
2017 (English)In: INTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, Institute of Noise Control Engineering , 2017Conference paper, Published paper (Refereed)
Abstract [en]

When measuring noise emission of road vehicles or tyres, regulations such as ECE R51, R30 and R117 and (indirectly) EU regulations (EC) 661:2009 and 1222:2009, require testing to be made on a reference surface defined in ISO 10844. The surface is claimed to:

• produce consistent levels of tyre/road noise emission under various operating conditions, including those appropriate to vehicle noise testing

• minimize inter-site variation

• provide minor sound absorption

Originally, ISO 10844 was developed with the aim to minimize tyre/road noise, to cause as little influence as possible on vehicle noise during full-throttle acceleration, and it served well for this purpose. However, it was soon applied also to testing in conditions when tyre/road noise is the only or dominating source. Then, it appeared that various sites gave site-to-site variations up to 5-8 dB(A), probably as some users tried to produce as low noise as possible within the tolerances. The 2014 version aimed at reducing the site-to-site variation to half; i.e. about 3-4 dB(A) by applying new or updated measurement methods, allowing tightening of some technical requirements. However, even 3 dB variation is too much, which will seriously limit the efficiency of noise limits and tyre labelling system. This paper proposes a calibration procedure for ISO surfaces, by which one can quantify the differences and correct values to a global reference. This is proposed to be based on the use of the SRTT tyre, defined by ASTM F2493:2014. Several tests have shown this tyre to give reproducible values within approximately 1 dB(A). If a number of such tyres are used; say 8, the variation between different sets will potentially be less than ±0.5 dB(A). Testing ISO 10844 surfaces periodically with such SRTT sets can then be used to determine a site-specific calibration level, to be compared to a global average reference. It is proposed to use the CPX method of ISO 11819-2 and a specific type of CPX trailer, and to observe the requirements in ISO/TS 11819-3 about reference tyres.

Place, publisher, year, edition, pages
Institute of Noise Control Engineering , 2017.
Keywords [en]
Tyre, Pavement, Standard specification, Proposal, Noise, Sound level, Calibration
National Category
Infrastructure Engineering
Research subject
90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle
Identifiers
URN: urn:nbn:se:vti:diva-12870Scopus ID: 2-s2.0-85042055901OAI: oai:DiVA.org:vti-12870DiVA, id: diva2:1194896
Conference
46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017, 27 August 2017 through 30 August 2017
Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-05-21Bibliographically approved

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Sandberg, Ulf

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