Conference_programme: 25.2 - Tyre / road noise
Lecture: Influence of road surfaces on vehicle running noise in the public roads of Japan
Author(s): Koike Hiroshi
Summary:
Measures taken on road surfaces, such as the introduction of low-noise road surfaces, are considered to be one of the most effective in reducing road traffic noise. Although such measures have also been applied in some areas in Japan, the potential of road surface measures to reduce noise is yet to be clarified sufficiently. The CPX method is widely used in European countries for evaluating the effect of road surfaces on road traffic noise, but it has not been introduced in Japan so far due to various reasons. \nAccordingly, in order to understand the road surface situation of domestic public roads and to investigate the potential for reducing noise, tyre-proximity noise measurements were carried out on public roads using a simple method with reference to the self-powered vehicle method of CPX. \nThe applicability of the method for evaluating the vehicle pass-by noise was first confirmed by tests performed on test tracks, before it was applied to public roads. Measurements were then carried out on public roads paved with several kinds of pavement: dense asphalt, porous asphalt, double-layer porous asphalt and heat-insulating pavement. Heat-insulating pavement has been employed in recent years in central Tokyo in order to lower the road surface temperature.\nBased on the measurement results, the distribution of sound pressure level of tyre-proximity noise for each type of road surface was determined quantitatively. The results further showed that heat-insulating pavement greatly reduces car running noise, which is considered possible due to the surface grinding process used to construct this type of pavement.\n
Corresponding author
Name: Mr Hiroshi Koike
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Country: Japan
