Aeroacoustic sensitivity analysis and its application for noise barrier design

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Aeroacoustic sensitivity analysis and its application for noise barrier design

Baysal, Oktay / Ghayour, Kaveh / Idres, Moumen M.

An automated design optimization method is demonstrated by computationally modeling the wheel-on-rail noise. The noise propagation is simulated by solving the wave equation using the boundary element method and compared with field test data. Then, the computational model was coupled with an optimization methodology through finite-differenced sensitivities. Using this method, a number of new designs was obtained and evaluated for their relative effectiveness. Three new designs were found to improve the insertion loss within the design space delineated by the given geometrical constraints. Finally, for improved computational efficiency, a continuous adjoint sensitivity methodology was applied to the wave equation to obtain the shape sensitivity derivatives of the acoustic pressure field. Its accuracy and validity are demonstrated for objectives defined on the barrier surface and out in the acoustic field.