Abstract
Noise level in the surroundings of traffic routes mainly depends from traffic volume, flow composition, speed of the vehicles as well as from the cross-section and road longitudinal gradient. Under higher speeds significant influence on the noise level has also tyre/road noise. Tyre/road noise depends on type and pavement condition state, specifically from the surface macrotexture. The influence of macrotexture is varying and strictly connected with the type of vehicles, tyres characteristics, frequencies of emitted noise. On the base of investigations of the rolling noise applying Statistical Pass-By method along the Polish roads the paper presents elaborated dependences and fixed values of differences between maximum noise levels under passing multiple-axle heavy vehicle and passenger car on the asphalt concrete surface, stone mastic asphalt and the surface dressing. The functional dependences between maximum rolling noise levels in the range of complete level and in the octave band spectra: 250 Hz, 500 Hz, 1000 Hz, 2000 Hz and 4000 Hz and between the surface macrotexture described by mean profile depth, and logarithm of vehicle speed and adequate nomograms were evaluated in the paper. On this base the values of differences in the levels of emitted noise from passing heavy vehicle and passenger car in function of speed and surface macrotexture were computed. The manuscript also presents how surface macrotexture and traffic flow composition have influence on equivalent noise level in the road vicinity under equal traffic volume.
Highlights
Traffic noise is one of the most important problems in the frame of environmental protection
Results of tests conducted in different research centres indicate that the tyre/road noise level depends on technology of the wearing coarse construction
Relations in the form of polynomial between emitted noise level under singly passing passenger car (L1) or multipleaxle heavy vehicle (L2B) in octave band spectra and macrotexture (MPD) and logarithm of speed were elaborated on a base of conducted tests results:
Summary
Traffic noise is one of the most important problems in the frame of environmental protection. The surface texture determined in the form of geometric description of irregularities plays a decisive role in creating and protecting safe traffic It has significant influence on fuel consumption, wearing of tires and emission of noise in the tyre/road contact surface. The works of Sandberg, Descornet (1980), Sandberg, Ejsmont are to be specified and underlined (2002) As it comes to France investigations (Bar, Delanne 1993) on the surface of fine texture (according to the sand patch test: MTD (Mean Texture Depth) = 0.37–0.60 mm) the noise level was fairly 3 dB(A) higher than on the surface of very fine texture (MTD = 0.30–0.34 mm) and it was close to 3 dB(A) lower comparing with the noisiness on very coarse surface (MTD = 2.50–3.00 mm). The differences in the emitted sound pressure levels under rolling statistic multiple-axle heavy vehicle and passenger car in the aspect of macrotexture and vehicle speed were observed and underlined
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