Requirements and testing methods for ISO 10844: 2011 test tracks

摘要

The reproducibility of tyre and vehicle noise tests is defined for a large part by thernstandardization of the road surface properties. Within ISO TC43 WG 42 the TT subgrouprnhas revised the version of 1994 and the outcome was issued in 2011 as ISO 10844:2011.rnThe new 2011 standard formulates tightened requirements for the surface properties andrnalso defines more advanced testing procedures.rnThis paper explains the background of the improved set of requirements andrnpresents the technical developments in the measurement methods for texture and acousticrnabsorption. Texture data acquisition can now also be based on a mobile system, running atrnlow speed and thus giving high accuracy. The acoustic absorption is based on the wellrnknown impedance tube with two microphone technology, slightly modified to make it fit forrnin-situ use. The presented version is further modified to suppress the distortion due to thernoccurrence of destructive interference at a microphone position.rnIn addition examples are given of the data processing, including the developments inrnthe texture standard 13473-1. The application of the ENDT procedure is presented basedrnon actual input texture data.