| 1. |
- Forssén, Jens, 1968, et al.
(författare)
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A low-height acoustic screen in a setting with an urban road: measured and predicted insertion loss
- 2016
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Ingår i: Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future. - 9783939296119 ; , s. 6435-6443
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Konferensbidrag (refereegranskat)abstract
- A low screen was temporarily installed alongside an urban road to test the acoustic performance. Within the on-going project, the screen is an acoustic prototype, whereas later, a screen design will be developed considering also perceived acoustic quality and visual aspects. The current acoustic prototype, built up from concrete modules, was placed beside a small park on the reservation between a two-lane road and a track for walking and cycling. A larger traffic system, of which the two-lane road is a part, determines the daytime equivalent noise level within the urban area. The screen height was about 1.3 m as measured from the level of the road surface and the width of the screen top was 0.3 m. Measurements were carried out both at 20 m distance from the road (within the park) and at 5 m distance from the road (on the cycle track). Insertion loss in maximum level, using controlled light vehicle pass-by at 50 km/h, was measured to 10 dB and 6 dB at 5 and 20 m distance, respectively, at 1.5 m height. The measured results have been compared with those predicted by both a noise mapping software and a boundary element method, showing reasonable agreement.
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| 2. |
- Forssén, Jens, 1968, et al.
(författare)
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Performance of a Low-Height Acoustic Screen for Urban Roads: Field Measurement and Numerical Study
- 2019
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Ingår i: Acta Acustica united with Acustica. - 1610-1928 .- 1861-9959. ; 105:6, s. 1026-1034
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Tidskriftsartikel (refereegranskat)abstract
- Field measurements and numerical modelling were used to study the acoustic performance of a low screen in an urban road setting. The results show the usefulness of low screens as well as suggests improvements in screen design. For the measurements, an acoustic screen built up from concrete modules was temporarily installed beside a small park on the reservation between a two-lane road and a track for walking and cycling. A larger traffic system, of which the two-lane road is a part, determines the daytime equivalent noise level within the urban area. The screen height was about 1.4m as measured from the level of the road surface and the width of the screen top was 0.3 m. Measurements were carried out both at 20 m distance from the road (within the park) and at 5 m distance from the road (at the cycle track). Insertion loss in maximum level, using controlled light-vehicle pass-by at 50 km/h, was measured to 10 dB at 5 m distance and to 6 dB at 20 m distance, at 1.5 m height. Insertion loss in equivalent level was measured within the park to 4 dB at 1.5 m height. A listening experiment confirmed a perceived improvement from installing the screen. The measured results were also compared with predicted results using a boundary element method (BEM) and a noise mapping software, the latter showing good agreement, overestimating the equivalent level insertion loss by 1 dB in the park. The BEM comparison showed reasonable agreement in maximum level insertion loss considering that facade reflections were excluded, with an overestimation of 5 dB at the cycle track, and good agreement in the park, overestimating by up to 1 dB the equivalent and maximum level insertion losses. BEM predictions were used to also investigate other screen designs, showing a positive effect of an acoustically soft screen top, significant for a screen width of 0.2 m and increasing for wider screens.
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| 3. |
- Torehammar, Clas, et al.
(författare)
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Nine sound-art installations in public space
- 2012
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Ingår i: 41st International Congress and Exposition on Noise Control Engineering 2012 (INTER-NOISE 2012). - Red Hook, NY, USA : Institute of Noise Control Engineering (INCE).
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Konferensbidrag (refereegranskat)abstract
- The aspect of sound as a design element in an architectural context has been discussed for a long time, but there are still today very few permanent projects put into practice. The functional use of acoustics is easily comprehended when utilized to reduce unwanted noise from roads, or when it is perfected to convey speech and music in concert halls. To add sounds to create a sense of space, use it as a quality or defining identity is however still an unexplored field of knowledge. Finding the right balance between creating a quality for the space with dynamics and variety, while still being sustainable over time is challenging. The paper presents theories, methods, findings and results from a large project including nine installations. The project concerns indoor sound installations in large public spaces in Stockholm including acoustic investigations, electro acoustic installations and composition of sound installations for the specific space. The method is both scientific and art-based. The sound design is used as a way of empowering site-specific functions and architectural themes, but also in some cases as a solitary intentional characteristic quality of the space.
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