Contribution
Comparison of calculated close proximity levels and pass-by levels for tyre/road noise
* Presenting author
Abstract:
For road traffic noise assessments, measured close-proximity (CPX) levels have to be converted into pavement corrections. Such converters are typically derived from collections of CPX and statistical pass-by (SPB) measurements. CPX levels. .In this paper, simulation results of the Chalmers Tyre/road interaction model (Chatrin) are used instead to explore how CPX and SPB levels are correlated as function of speed, road roughness and tyre. In all simulation the same tyre model but with different profiles is used. CPX results are obtained for the profile of a SRTT tyre for different driving speeds and road surfaces. As these are simulated results, they are free from eventual influence of the measurement trailer. The simulation of the pass-by levels do not include the influence of the vehicle body on the sound radiation.Such an approach allows for establishing the relation of CPX and SPB results for the SRTT tyre as function of speed and road roughness. It also allows for comparing this relation with the one obtained for the case of a SRTT tyre profile used in the CPX simulation and a population of different tyre profiles used in the SPB calculations as done in measurements.