Locally or Non-Locally Reacting Boundaries: Does it Make a Significant Acoustic Difference?

Abstract

As an alternative for the common geometric room acoustical models, a wave theory-based model has been developed derived from the so-called WRW scheme, often used in seismic modelling [1, 2]. In this model, the wave properties of sound are appropriately taken into account. The proposed model is similar to the Boundary Element Method (BEM). Other than in BEM, in the WRW scheme non-locally reacting room boundaries can be included in the modelling process using only the fluid domain. The results of sound field modelling in rooms with locally as well as non-locally reacting boundaries are presented. The differences are analysed and their relevance is discussed.

Virtual Acoustics

“…In numerical wave modelling the question of complex material impedances and of locally versus non-locally reacting surfaces is an interesting question. With a new wave based 3-D acoustical simulation algorithm non-locally reaction can be modelled (Opdam et al, 2013). Results show that non-locally reacting boundaries do affect the acoustical space and not only close to the boundaries.…”

Simulation and Evaluation of Acoustic Environments

“…Just a short summary is presented here. For details it is referred to the most recent publications [19][20][21][22][23][24][25][26][27][28][29] .…”

“…In numerical wave modelling, the question of complex material impedances and of locally versus non-locally reacting surfaces is investigated. A wave based 3-D acoustical simulation algorithm (WRW method) can handle non-locally reacting (angle dependent) boundary conditions 19,20 . Preliminary results show that non-locally reacting boundaries do affect the whole acoustical space and not only close to the boundaries.…”