Investigations on road noise level spatial variability within a specially designed acoustic balcony

Naish, Daniel A., Tan, Andy C.C., & Demirbilek, F. Nur (2014) Investigations on road noise level spatial variability within a specially designed acoustic balcony. In Inter.noise 2014, 16-19 November, Melbourne, VIC.

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Abstract

An investigation into the spatial distribution of road traffic noise levels on a balcony is conducted. A balcony constructed to a special acoustic design due to its elevation above an 8 lane motorway is selected for detailed measurements. The as-constructed balcony design includes solid parapets, side walls, ceiling shields and highly absorptive material placed on the ceiling. Road traffic noise measurements are conducted spatially using a five channel acoustic analyzer, where four microphones are located at various positions within the balcony space and one microphone placed outside the parapet at a reference position. Spatial distributions in both vertical and horizontal planes are measured. A theoretical model and prediction configuration is presented that assesses the acoustic performance of the balcony under existing traffic flow conditions. The prediction model implements a combined direct path, specular reflection path and diffuse reflection path utilizing image source and radiosity techniques. Results obtained from the prediction model are presented and compared to the measurement results. The predictions are found to correlate well with measurements with some minor differences that are explained. It is determined that the prediction methodology is acceptable to assess a wider range of street and balcony configuration scenarios.

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ID Code: 78918
Item Type: Conference Paper
Refereed: Yes
ISBN: 9780909882037
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 The Australian Acoustical Society
Deposited On: 24 Nov 2014 22:56
Last Modified: 05 Feb 2015 23:24

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