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Modelling Acoustic Horns with FEA

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Simulations for acoustic horns have been developed using Finite Element Analysis (FEA) in both ANSYS and COMSOL modelling software. The FEA method solves the ideal, linear wave equation, so the effects of non-linearity and viscosity are not inherently simulated. Quarter models were used in each case as the acoustic horns were not axi-symmetric. The size and shape of the horns have been informed by longstanding design parameters. The simulation results have been compared with acoustic measurements, and discrepancies investigated. While it was found that beam angle (dispersion) characteristics were relatively robust, it was useful in both cases to improve the accuracy of the beam angle, SPL, and impedance simulations by the application of frequency dependent damping to models of the compression driver.

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