Archives of Acoustics,
30, 1, pp. , 2005
Noise level spread in the vicinity of a crossroads
In the paper, the PROP10 program is used to present the
time-average sound level on façades of buildings in the vicinity of a
crossroads. The propagation model within an urban system forming canyon streets
includes the wave interaction with obstacles, multi-reflections from building
walls and single and double diffraction at their wedges. For the current purpose
the program is provided with a road model in which the vehicle route is divided
into sub-segments with lengths and linear densities of emitted energy that
depend on the traffic organization in the vicinity of the crossroads. The
lengths of the sub-segments, where vehicles wait and are forced to a subsequent
start and stop, depend on the flow rates on lanes, the equivalent vehicle
length, the red and green light times and the speed of leaving a crossroads. The
linear energy density at these sub-segments depends on a parameter
characterizing the energy emitted during the starting of a vehicle. The
time-average sound level is analyzed as a function of the enumerated parameters.
Key words: traffic noise, interrupted movement, canyon street.
time-average sound level on façades of buildings in the vicinity of a
crossroads. The propagation model within an urban system forming canyon streets
includes the wave interaction with obstacles, multi-reflections from building
walls and single and double diffraction at their wedges. For the current purpose
the program is provided with a road model in which the vehicle route is divided
into sub-segments with lengths and linear densities of emitted energy that
depend on the traffic organization in the vicinity of the crossroads. The
lengths of the sub-segments, where vehicles wait and are forced to a subsequent
start and stop, depend on the flow rates on lanes, the equivalent vehicle
length, the red and green light times and the speed of leaving a crossroads. The
linear energy density at these sub-segments depends on a parameter
characterizing the energy emitted during the starting of a vehicle. The
time-average sound level is analyzed as a function of the enumerated parameters.
Key words: traffic noise, interrupted movement, canyon street.
Full Text:
PDF
Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN).