Possible Improvement of Acoustical Climate Part I: Measurements and Theoretical Description

Abstract

In the paper, the simulation PROP5 program is used to predict the sound level in proximity of a road with defined surroundings. The simulation involves road geometry (number of lanes and their positions) and traffic structure (vehicle flow rates and their average speeds), with equivalent omnidirectional point sources representing vehicles. In Part I of the paper, the agreement between measurement and simulation results is tested to verify the accuracy degree of the applied models of a road, as a noise source and propagation throughout surrounding space. In Part II, using the pre-tested simulation program, the possibility of acoustic climate improvement has been analyzed.

Possible Improvement of Acoustical Climate Part II: Possible Solutions

“…The simulation program PROP5 used here contains the MAK2 model for a road as the noise source (Makarewicz, 1996;Glegg, Yoon, 1990). The single omnidirectional equivalent point sources, representing the class of light (l) and heavy (h) vehicles, have been defined by statistically estimated (Walerian et al, 2010):…”

“…In the Part I of the paper, the real building has been an object of investigation (Walerian et al, 2010). The measurement of the sound level has been carried out over the building façade, facing the noisy six-lane road.…”

“…In Part I of the paper, after carrying out the field measurement of the sound level over the building façade, the urban system model, appropriate for application in the simulation program PROP5, has been established (Walerian et al, 2010). Here, the program is used for analysis of the acoustical field created within the urban system, and the possibility of its variation resulting in acoustical comfort improvements.…”

“…Based on published data, the MAK2 road model has been introduced. In the PART I of the paper (Walerian et al, 2010), assuming the MAK2 road model, the basic model of the analyzed urban system has been established. By comparison with the field measurement, the basic urban system of a half-plane with the investigated building has been found to be enough accurate to predict the sound level over the building façade.…”

“…The appropriate models of verified accuracy have been chosen by comparison of the simulation results with field measurements (Walerian et al, 2010). Here, using the pre-tested simulation program, the possibility of acoustic climate improvement has been analyzed in the ranges of practical variations of the input parameters.…”