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Modelling of scattering of sound from trees by the PSTD method

Maarten Hornikx (Institutionen för bygg- och miljöteknik, Teknisk akustik, Vibroakustik) ; Dick Botteldooren ; Timothy Van Renterghem ; Jens Forssén (Institutionen för bygg- och miljöteknik, Teknisk akustik, Vibroakustik)
Forum Acusticum, Aalborg, Denmark p. 6. (2011)
[Konferensbidrag, refereegranskat]

In an urban environment with multiple building façade reflections, scattering from trees will increase the diffusivity of the sound field and can lead to a reduction of the noise level. Here, the possibility to incorporate scattering objects as the trunk and branches of trees in the framework of an urban propagation model, the Fourier pseudospectral time-domain (PSTD) method, has been investigated. Two different modelling approaches are studied, with either a different density of the scattering objects or with the acoustic normal velocity components at the scattering boundaries and all acoustic components inside the scattering volumes equal to zero. The first PSTD scattering approach shows to work best, although some underestimation of levels is shown. The accuracy of modelling scattering from trees by using a coarser mesh is investigated.



Denna post skapades 2012-03-30. Senast ändrad 2014-10-27.
CPL Pubid: 156316

 

Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Teknisk akustik, Vibroakustik

Ämnesområden

Akustik

Chalmers infrastruktur