声场模拟教程.pdf

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Acoustic Simulations ACTRAN Training - ACOUSTICS Copyright Free Field Technologies

Introduction  These slides present the ACOUSTICs materials, components and boundary conditions involved in a pure acoustic simulation. 2 Copyright Free Field Technologies

Content  The FLUID Material  The Finite Fluid Component  The Infinite Fluid Component  The Boundary Conditions  Output quantities 3 Copyright Free Field Technologies

The Fluid Material (1)  The Fluid material is the standard material used for defining both viscous and non viscous fluids related to an acoustic medium.  The properties that define a Fluid material are:  Sound speed  default value: 340 m.s-1  Fluid density  default value: 1.225kg.m-³  Cp  default value: 1004  Cv  default value: 716 4 Copyright Free Field Technologies

The Fluid Material (2)  Syntax in the ACTRAN input file:  Definition in ACTRAN/VI BEGIN MATERIAL Id FLUID SOUND_SPEED value FLUID_DENSITY value CP value CV value END MATERIAL Id 5 Copyright Free Field Technologies

The Fluid Material (3)  The default values are provided for air at 15°C and 1atm;  The default values are hardcoded in ACTRAN. Properties Fields - Blank Properties Fields - Filled BEGIN MATERIAL 1 FLUID END MATERIAL 1 Is equivalent to BEGIN MATERIAL 1 FLUID SOUND_SPEED 340 FLUID_DENSITY 1.225 CP 1004 CV 716 END MATERIAL 1 6 Copyright Free Field Technologies

Content  The FLUID Material  The Finite Fluid Component  The Infinite Fluid Component  The Boundary Conditions  Output quantities 7 Copyright Free Field Technologies

The Finite Fluid Component (1)  The Finite Fluid component is the standard component for modeling all type of finite acoustic media (including heavy fluids media). Supported topologies  Points to a valid acoustic Fluid material  Unknowns: fluid pressure (1 dof/node)  Standard meshing criteria (without flow):  6 to 10 linear elements per wavelength  4 to 8 quadratic elements per wavelength  These are just guidelines to insure a sufficient level of accuracy. This is very subjective…. 8 Copyright Free Field Technologies maxmin44fch

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