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3.2 Galerkin formulation 340 m/s ELEMENT A.F. Seybert acoustic radiation ANALYSIS TYPE Sound analytical solution benchmark example bilinear shape functions Boundary element method CA1 DATE/ISSUE CA3 DATE/ISSUE discontinuous velocity boundary discretized elements with bilinear exterior unbounded fluid air frequency domain Frequency spectrum incoming plane wave INTERSECTING RIBS Test kg/m3 Speed Leopold Franzens University method for acoustic N/m2 sound pressure NADwork SYSNOISE NADwork NADwork Version 3.2 numerical model numerical results PLATE WITH INTERSECTING Pressure Level dB programs NADwork Version QinetiQ Quadrilateral boundary elements radiation and scattering radiation efficiency regarding the treatment Rizzo and D.J. scattering of sound scattering symmetric coefficient show excellent correspondence sound pressure level Speed of sound sphere show excellent suppress irregular frequencies symmetric coefficient matrices SYSNOISE NADwork SYSNOISE SYSNOISE Version 5.5 thin-walled treatment of irregular TYPE Sound radiation University Innsbruck ANALYSIS velocity boundary conditions Version 3.2 Galerkin Version 5.5 Collocation VIBRATING CYLINDER Test vibrating lateral surface wave numbers