tutorial: vibroacoustic loudspeaker simulation
TRANSCRIPT
Tutorial: Vibroacoustic Loudspeaker Simulation: Multiphysics with BEM-FEM
Abstract
This model shows a full vibroacoustic analysis of a loudspeaker including driver, cabinet, and stand. It lets you apply a nominal driving voltage and extract the resulting sound pressure level in the cabinet and in the outside room, as well as the deformation of the cabinet and driver, for a given frequency. The loudspeaker stand is placed on a hard floor some distance from a wall, located behind it.
The example uses a hybrid BEM-FEM approach and couples the Solid Mechanics, Shell, Pressure Acoustics, Frequency Domain, and Pressure Acoustics, Boundary Elements physics interfaces.
The model uses six multiphysics couplings:
Acoustics BEM to Solid and Shell (2)
Acoustics FEM to Solid and Shell (2)
Shell to Solid (1)
Acoustic BEM to Acoustics FEM (1)
The model is solved for a single frequency of 3000 Hz. The frequency is defined as a parameter that is easily changed.
The electromagnetic properties of the driver are supplied from the Loudspeaker Driver model (which requires the Acoustics Module and the AC/DC Module).
The vibroacoustic speaker model requires the Acoustics Module and the Structural Mechanics Module.
Model Definitions
Speaker membrane, spider, surround: Shell Speaker cabinet and stand: Solid Mechanics Exterior Acoustics (BEM): Pressure Acoustics, Boundary Elements
Interior Acoustics (FEM): Pressure Acoustics, Frequency Domains • Air • Porous material
Floor
Wall
Results: First Eigenmodes
Results: Frequency Response
Pressure on floor and wall, and inside the speaker cabinet, as well as deformation of the membrane. Deformation of speaker cone and cabinet.
Results: Frequency Response
Spatial response 1 m in front of the speaker. Evaluation location of spatial response (scaled).
Results: Frequency Response
Visualization of the sound pressure level (SPL) on the floor, the wall, and a quarter sphere in
front of the speaker.
Results: Frequency Response
Visualization of the sound pressure level (SPL) in the xz-plane as well as the
speaker cabinet deformation.
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