1 1A Description of Actran workshop
1 To import an ACTRAN input file and check the content of it
2 To export both the mesh and the input file
3 To launch in different ways the input file
2 1B-1 Example of sound source in a treated cavity(foam layer)
1 One considers the same cavity as in workshop 1A but one layer of fluid elements is replaced by a foam layer
2 Sound in enclosure: a spherical source is placed in one corner of a 1m3 cavity wuth 5 rigid walls and a foam layer
3 A 0.125m thick foam layer is glued against one of the cavity walls(from y=0.375m to y=0.5m)
4 Use rigid porous elements
3 1B-2 Training of Kundt's tube
1 Problem description and models
2 Workshop description
3 Using BOXPRO as a pre-processing tool
4 1C Using equivalent admittance
1 One considers the same cavity as in previous workshop
2 The spherical source placed in one of the box corner at (x,y,z)=(-0.375,-0.375,-0.375)
3 Use an admittance boundary condition for modeling the foam
4 Computed results(compare with workshop 1A)
4.1 The mean square pressure amplitude from 1Hz to 500Hz
4.2 The sound pressure level at the center of the box
4.3 Plot a color map at 295Hz
5 2 Model extraction: acoustic cavity
1 One considers a 1m3 cavity, centered on the origin(0,0,0)
2 One considers default air properties for the fluid and assumes the walls to be rigid
3 Use quadratic, 0.125m sized elements
4 Post- processing:
4.1 Extract the modes in the 1Hz to 500Hz frequency range
4.2 Plot a color map of 7th mode(order(m,n,l)=(1,1,1)) and compare it with the workshop 1A map
6 3 Free field radiation of a monopole
1 Purpose: free-field radiation of a monopole in air at standard conditions
2 Plot the real part of the pressure from 1Hz to 500Hz measured at (x,y,z)=(1,0,0)
3 Plot the sound pressure level from 1Hz to 500Hz measured at (x,y,z)=(1,0,0)
4 Visualize a map using cutplanes functions
7 4 Duct radiating in free field
1 One considers a simple duct radiating in a half free space
2 The duct is excited with each mode propagating at 700Hz
3 Compute the pressure variation along the duct axis
4 Plot a color map
8 5A BC_MESH application: structure radiating in a free field
1 The objective of this workshop is to evaluate the acoustic radiation of a simple vibrating structure
2 The parameters of the problem
3 The displacement of the edges of the panel are set to 0
4 The excitation is displacement at the center of the plate
9 5B Training
1 The objective of this document is to explain how to create an ACTRAN model in order to compute the acoustic radiation of a vibrating structure
2 This training is based on a gearbox model
10 6 Visco-thermal effects in Actran
1 Visco-thermal elements in Actran
2 Purpose: understand the visco-thermal effects occurring in a thin circular tube connecting to acoustic cavities
3 Plot the SPL of the pressure from 10Hz to 3000Hz measured at (x,y,z)=(0.05,0.6,0) for 2 cases: with and without visco-thermal effects in the thin tube
4 Plot the average SPL in the different cavities
5 Visualize pressure maps at some frequencies of interest
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