Influence of the tyre impedance on CPX level used to evaluate tyre/road noise
Konferensbidrag (offentliggjort, men ej förlagsutgivet), 2016

For traffic noise studies CPX measurements are used to evaluate the noise-reduction of a road surface.CPX measurements as described in ISO/DIS 11819-2 are carried out at microphone positions close to predefined tyres at constant speed. The dominant CPX sound source is the tyre’s rolling noise as a result of tyre/road interaction, which - apart from the acoustic properties of the road surface - is mainly determined by the properties of the tyre.To ensure continuous quality and comparability of CPX measurements, the variation of acoustically relevant properties of the reference tyres must be taken into account to reduce measurement uncertainties. Thus, to ensure comparability, the standard ISO/TS 11819-3 specifies Shore hardness values to be checked at regular intervals and compared with normative values. According to our experience in CPX-measurements, determining the Shore hardness of the tyres is not sufficient to describe the reference tyres’ acoustically relevant properties. So, as an additional parameter the mechanical impedance of different reference tyres was measured and compared to their Shore hardness and CPX levels on different road surfaces.Based on these results, conclusions are drawn about the usability of the tyre impedance to increase the quality and comparability of CPX measurements.

tyre/road noise

mobility measurements

measurements

tyre ageing

numerical simulations

Författare

Stefan Schubert

Müller-BBM GmbH

Manuel Männel

Müller-BBM GmbH

Maximilian Ertsey

Müller-BBM GmbH

Carsten Hoever

Vibroakustik

Proceedings INTER-NOISE 2016, 45th International Congress and Exposition on Noise control Engineering, August 21-24 2016, Hamburg, Germany

4945-4954

Drivkrafter

Hållbar utveckling

Styrkeområden

Transport

Ämneskategorier

Strömningsmekanik och akustik