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Time-domain simulations of low-height porous noise barriers with periodically spaced scattering inclusions

Bart Van der Aa (Institutionen för bygg- och miljöteknik, Teknisk akustik, Vibroakustik) ; Jens Forssén (Institutionen för bygg- och miljöteknik, Teknisk akustik, Vibroakustik)
Proceeding of Forum Acusticum 2014, 7-12 September, Krakow, Poland (2221-3767). (2014)
[Konferensbidrag, refereegranskat]

In this work we investigate the possibility to create a noise reducing device by embedding periodically spaced scattering units into a porous matrix. A numerical study based on the Finite-Difference Time- Domain method is therefore performed. The porous matrix is modelled by the Zwikker and Kosten phenomenological porous rigid-frame model, and scattering units are considered to be acoustically rigid. For simplicity a two-dimensional computational domain and a homogeneous atmosphere has been assumed. We focus on low-height noise barriers with the intention to reduce traffic noise along- side pavements, e.g. for pedestrians and cyclists. A number of porous barriers with acoustically rigid inclusions are investigated and compared against porous barriers without scattering units added. In addition, the reduction is tested against a simple acoustically rigid screen.

Nyckelord: Outdoor sound propagation, FDTD, traffic-noise, low-height noise barriers, porous noise barriers



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Denna post skapades 2014-12-09. Senast ändrad 2016-01-28.
CPL Pubid: 207716

 

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Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Teknisk akustik, Vibroakustik (2005-2017)

Ämnesområden

Building Futures
Materialvetenskap
Transport
Fysik
Materialteknik
Naturresursteknik

Chalmers infrastruktur