Frequency-Dependent Absorbing Boundary Implementations in 3D Finite Difference Time Domain Room Acoustics Simulations (Invited Paper)

Stephen Oxnard; Dean O'Brien; Jelle Van Mourik; Damian Thomas Murphy

Frequency-Dependent Absorbing Boundary Implementations in 3D Finite Difference Time Domain Room Acoustics Simulations (Invited Paper)

Stephen Oxnard, Dean O'Brien, Jelle Van Mourik, Damian Thomas Murphy

Electronic Engineering

Research output: Contribution to conference › Paper › peer-review

Abstract

Finite Difference Time Domain room acoustics modelling provides accurate emulation of sound propagation within enclosed structures. Inclusion of frequency-dependent boundary conditions in such models facilitates emulation of realistic sound wave interaction with absorbing surface materials. These boundary conditions can be implemented by means of octave band modelling or digital impedance filter methods. This paper extends research in this area by comparing results obtained from these boundary modelling methods in terms of accuracy and required computational resources. Results show that octave band approaches achieve a higher degree of accuracy over the digital impedance filter method. However, in terms of simulation run times, the octave band model must make use of parallel computation architectures to realise a simulation time lower than the digital impedance filter model. Furthermore, the results presented inform routes of further study focussing on refinement of both methods to create an optimal, computationally efficient frequency-dependent boundary model.

Original language	English
Publication status	Published - 31 May 2015
Event	EuroNoise 2015 - Maastricht, Netherlands Duration: 31 May 2015 → 3 Jun 2015

Conference

Conference	EuroNoise 2015
Country/Territory	Netherlands
City	Maastricht
Period	31/05/15 → 3/06/15

Keywords

audio
acoustics
noise
environment

Access to Document

http://www.euronoise2015.eu/

Cite this

@conference{07ea3d3a0ba041ba8eb355a9f3881731,

title = "Frequency-Dependent Absorbing Boundary Implementations in 3D Finite Difference Time Domain Room Acoustics Simulations (Invited Paper)",

abstract = "Finite Difference Time Domain room acoustics modelling provides accurate emulation of sound propagation within enclosed structures. Inclusion of frequency-dependent boundary conditions in such models facilitates emulation of realistic sound wave interaction with absorbing surface materials. These boundary conditions can be implemented by means of octave band modelling or digital impedance filter methods. This paper extends research in this area by comparing results obtained from these boundary modelling methods in terms of accuracy and required computational resources. Results show that octave band approaches achieve a higher degree of accuracy over the digital impedance filter method. However, in terms of simulation run times, the octave band model must make use of parallel computation architectures to realise a simulation time lower than the digital impedance filter model. Furthermore, the results presented inform routes of further study focussing on refinement of both methods to create an optimal, computationally efficient frequency-dependent boundary model.",

keywords = "audio, acoustics, noise, environment",

author = "Stephen Oxnard and Dean O'Brien and {Van Mourik}, Jelle and Murphy, {Damian Thomas}",

year = "2015",

month = may,

day = "31",

language = "English",

note = "EuroNoise 2015 ; Conference date: 31-05-2015 Through 03-06-2015",

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TY - CONF

T1 - Frequency-Dependent Absorbing Boundary Implementations in 3D Finite Difference Time Domain Room Acoustics Simulations (Invited Paper)

AU - Oxnard, Stephen

AU - O'Brien, Dean

AU - Van Mourik, Jelle

AU - Murphy, Damian Thomas

PY - 2015/5/31

Y1 - 2015/5/31

N2 - Finite Difference Time Domain room acoustics modelling provides accurate emulation of sound propagation within enclosed structures. Inclusion of frequency-dependent boundary conditions in such models facilitates emulation of realistic sound wave interaction with absorbing surface materials. These boundary conditions can be implemented by means of octave band modelling or digital impedance filter methods. This paper extends research in this area by comparing results obtained from these boundary modelling methods in terms of accuracy and required computational resources. Results show that octave band approaches achieve a higher degree of accuracy over the digital impedance filter method. However, in terms of simulation run times, the octave band model must make use of parallel computation architectures to realise a simulation time lower than the digital impedance filter model. Furthermore, the results presented inform routes of further study focussing on refinement of both methods to create an optimal, computationally efficient frequency-dependent boundary model.

AB - Finite Difference Time Domain room acoustics modelling provides accurate emulation of sound propagation within enclosed structures. Inclusion of frequency-dependent boundary conditions in such models facilitates emulation of realistic sound wave interaction with absorbing surface materials. These boundary conditions can be implemented by means of octave band modelling or digital impedance filter methods. This paper extends research in this area by comparing results obtained from these boundary modelling methods in terms of accuracy and required computational resources. Results show that octave band approaches achieve a higher degree of accuracy over the digital impedance filter method. However, in terms of simulation run times, the octave band model must make use of parallel computation architectures to realise a simulation time lower than the digital impedance filter model. Furthermore, the results presented inform routes of further study focussing on refinement of both methods to create an optimal, computationally efficient frequency-dependent boundary model.

KW - audio

KW - acoustics

KW - noise

KW - environment

M3 - Paper

T2 - EuroNoise 2015

Y2 - 31 May 2015 through 3 June 2015

ER -