@article {Sandberg:2017:0736-2935:888,
title = "Calibrating the ISO 10844 test surfaces used for vehicle and tyre testing",
journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings",
parent_itemid = "infobike://ince/incecp",
publishercode ="ince",
year = "2017",
volume = "255",
number = "7",
publication date ="2017-12-07T00:00:00",
pages = "888-897",
itemtype = "ARTICLE",
issn = "0736-2935",
url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/2017/00000255/00000007/art00107",
author = "Sandberg, Ulf",
abstract = "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 ISO10844. The first version was published in 1994, and the most
recent version is from 2014. The surface is claimed to produce consistent levels of tyre/road noise emission under various operating conditions and to minimize inter-site variation. Originally, ISO10844 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 5-6 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 dB(A). 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 in each set, the variation between different sets will potentially be less than 0.5 dB(A). Testing ISO10844 surfaces periodically with such sets can then be used to determine a site-specific reference level, to
be compared to a global reference level.",
}