Urban background noise mapping : the general model
| Autor: | Erik M. Salomons, Jens Forssén, Maarten Hornikx, T. Van Renterghem, Dick Botteldooren, Mikael Ögren, Weigang Wei |
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| Přispěvatelé: | Building Acoustics, Building Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Engineering
Technology and Engineering Acoustics and Ultrasonics Earth & Environment Acoustics FDTD-PE MODEL DIFFRACTION Civil engineering law.invention Background noise Urban Development law Shielded cable Specular reflection Built Environment Roof FACADE business.industry REFLECTIONS OUTDOOR SOUND-PROPAGATION CITY CANYONS ROAD TRAFFIC NOISE Noise EQUIVALENT SOURCES APPROACH SCALE-MODEL UES - Urban Environment & Safety QUIET SIMULATION Facade ELSS - Earth Life and Social Sciences business Acoustics and Audiology Scale model Music |
| Zdroj: | Acta Acustica united with Acustica, 100(6), 1098-1111. S. Hirzel Verlag GmbH Acta Acustica united with Acustica, 6, 100, 1-24 ACTA ACUSTICA UNITED WITH ACUSTICA |
| ISSN: | 1610-1928 |
| Popis: | Surveys show that inhabitants of dwellings exposed to high noise levels benefit from having access to a quiet side. However, current practice in noise prediction often underestimates the noise levels at a shielded facade. Multiple reflections between facades in street canyons and inner yards are commonly neglected and facades are approximated as perfectly flat surfaces yielding only specular reflection. In addition, sources at distances much larger than normally taken into account in noise maps might still contribute significantly. Since one of the main reasons for this is computational burden, an efficient engineering model for the diffraction of the sound over the roof tops is proposed, which considers multiple reflections, variation in building height, canyon width, facade roughness and different roof shapes. The model is fitted on an extensive set of full-wave numerical calculations of canyon-to-canyon sound propagation with configurations matching the distribution of streets and building geometries in a typical historically grown European city. This model allows calculating the background noise in the shielded areas of a city, which could then efficiently be used to improve existing noise mapping calculations. The model was validated by comparison to long-term measurements at 9 building facades whereof 3 were at inner yards in the city of Ghent, Belgium. At shielded facades, a strong improvement in prediction accuracy is obtained. |
| Databáze: | OpenAIRE |
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