Archives of Acoustics, 30, 1, pp. , 2005

Noise level spread in the vicinity of a crossroads

E. Walerian
Institute of Fundamental Technological Research, Polish Academy of Sciences

R. Janczur
Institute of Fundamental Technological Research, Polish Academy of Sciences

M. Czechowicz
Institute of Fundamental Technological Research, Polish Academy of Sciences

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.
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