An analytical model for wedge-shaped acoustic arrays
| Autor: | Earl G. Williams, Simone Fontana, Falk-Martin Hoffmann, Filippo Maria Fazi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Beamforming Acoustics and Ultrasonics Mechanical Engineering Acoustics Holography 02 engineering and technology Inverse problem Condensed Matter Physics 01 natural sciences Pressure field Wedge (geometry) Short distance law.invention 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials law 0103 physical sciences Loudspeaker Normal velocity 010301 acoustics |
| Popis: | This work presents the derivation of a 3D sound field model for the pressure field radiated from loudspeaker arrays in acoustic wedge spaces. These wedge arrays are described by their normal velocity profile at a given boundary. Using this model, a suitable beamforming technique with two different beam patterns is derived based on a mode-matching approach. The model is then used to study the beamforming performance as a function of frequency and distance from the array by analysing the Arc Radial Functions introduced in this work. The theory is tested on the basis of simulation results for different wedges and validated through holographic measurements made with a hemi-cylindrical array. It is found that for a large distance, a far-field approximation of the model can be used to drive the array, whereas for a short distance, the general model must be applied to yield accurate results. |
| Databáze: | OpenAIRE |
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