30 June 2023

Treble simulation of empty rectangular rooms with porous absorbers

Abstract

When a rectangular room is empty and has a porous ceiling absorber, the sound field becomes quasi-two-dimensional. This is because the vertical sound field decays faster than the horizontal sound field due to the absorption. As a result, the porous ceiling absorber cannot reduce the reverberation time effectively at low frequencies. This paper demonstrates how the sound field varies with two different porous layer configurations using both measurements and Treble simulations.

Key findings

  • Why higher absorption coefficients do not guarantee lower reverberation times.
  • How to avoid a highly imbalanced energy decay when improving the acoustics.
  • Are absorption coefficients are good input data for predictions of room acoustics.



This shows that Treble can account for interference by including the phase information. This is delightful news for room acoustic simulation  software users, as not many energy-based GA can do such accurate simulations.
Dr. Cheol-Ho Jeong
Associate Professor, Acoustic Technology
DTU

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- Full bandwidth wave-based simulations using Treble

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