Finite Element Simulation of Edge Absorbers for Room Acoustic Applications

Description

To perform acoustic treatments in rooms for the low frequency range, porous absorbent material is often placed in or close to the edge of the room. This work presents a simulation procedure based on the Helmholtz equation which is solved using the Finite Element (FE) method. Thereby, the complex density and bulk modulus of the used porous material is obtained by fitting the Johnson-Champoux-Allard-Lafarge model to measurements in an impedance tube using the four-microphone method. The simulated room is modeled with sound-hard boundary conditions and has the same dimensions as the echoic chamber at the Building Physics Laboratory at Graz University of Technology. The FE simulation is used to determine transfer functions between sound source and microphone positions of a reverberation time measurement in the echoic chamber. Subsequently, these transfer functions are compared with those of real measurement in the echoic chamber. Therewith it can be shown that the simulation results are in good agreement to the measurements. The FE simulation results predict the sound field in the room, additionally the simulated sound field in the absorber can be visualized.

Period	8 Mar 2023
Event title	DAGA 2023 - 49. Jahrestagung für Akustik
Event type	Conference
Location	Hamburg, GermanyShow on map
Degree of Recognition	International