mirror of
https://github.com/JuliaFEM/JuliaFEM.jl.git
synced 2026-09-20 01:59:59 +00:00
Jukka Aho
782c252719
New 59-line test file for modal elasticity analysis: - Tests modal analysis of two cylinder meshes (CYLINDER1 and CYLINDER20) - Compares eigenfrequencies with Code Aster results (Tet4 elements) - Tests 3 lowest eigenfrequencies for each cylinder - Uses legacy Element/Problem API Validates modal analysis accuracy for different cylinder geometries by comparing with reference Code Aster results.
60 lines
2.1 KiB
Julia
60 lines
2.1 KiB
Julia
# This file is a part of JuliaFEM.
|
|
# License is MIT: see https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE.md
|
|
|
|
using JuliaFEM, Test
|
|
|
|
# eigenvalues of CYLINDER1
|
|
|
|
meshfile = @__DIR__() * "/testdata/primitives.med"
|
|
mesh = aster_read_mesh(meshfile, "CYLINDER_1_TET4")
|
|
cylinder = Problem(Elasticity, "CYLINDER", 3)
|
|
cylinder_elements = create_elements(mesh, "CYLINDER")
|
|
update!(cylinder_elements, "youngs modulus", 10000.0)
|
|
update!(cylinder_elements, "poissons ratio", 0.3)
|
|
update!(cylinder_elements, "density", 10.0)
|
|
add_elements!(cylinder, cylinder_elements)
|
|
|
|
bc = Problem(Dirichlet, "bc", 3, "displacement")
|
|
bc_elements = create_elements(mesh, "FACE_YZ1")
|
|
update!(bc_elements, "displacement 1", 0.0)
|
|
update!(bc_elements, "displacement 2", 0.0)
|
|
update!(bc_elements, "displacement 3", 0.0)
|
|
add_elements!(bc, bc_elements)
|
|
|
|
analysis = Analysis(Modal)
|
|
analysis.properties.nev = 3
|
|
add_problems!(analysis, cylinder, bc)
|
|
run!(analysis)
|
|
freqs_jf = sqrt.(analysis.properties.eigvals)/(2.0*pi)
|
|
freqs_ca = [4.84532E+00, 4.90698E+00, 8.33813E+00]
|
|
@test isapprox(freqs_jf, freqs_ca; rtol=1.0e-5)
|
|
|
|
# eigenvalues of CYLINDER20
|
|
|
|
meshfile = @__DIR__() * "/testdata/primitives.med"
|
|
mesh = aster_read_mesh(meshfile, "CYLINDER_20_TET4")
|
|
cylinder = Problem(Elasticity, "CYLINDER", 3)
|
|
cylinder_elements = create_elements(mesh, "CYLINDER")
|
|
#update!(cylinder_elements, "youngs modulus", 10.0e6)
|
|
update!(cylinder_elements, "youngs modulus", 50475.5)
|
|
update!(cylinder_elements, "poissons ratio", 0.3)
|
|
#update!(cylinder_elements, "density", 10.0)
|
|
update!(cylinder_elements, "density", 1.0)
|
|
add_elements!(cylinder, cylinder_elements)
|
|
|
|
|
|
bc = Problem(Dirichlet, "bc", 3, "displacement")
|
|
bc_elements = create_elements(mesh, "FACE1", "FACE2")
|
|
update!(bc_elements, "displacement 1", 0.0)
|
|
update!(bc_elements, "displacement 2", 0.0)
|
|
update!(bc_elements, "displacement 3", 0.0)
|
|
add_elements!(bc, bc_elements)
|
|
|
|
analysis = Analysis(Modal)
|
|
analysis.properties.nev = 3
|
|
add_problems!(analysis, cylinder, bc)
|
|
run!(analysis)
|
|
freqs_jf = sqrt.(analysis.properties.eigvals)/(2.0*pi)
|
|
freqs_ca = [1.19789E+00, 1.20179E+00, 3.07391E+00]
|
|
@test isapprox(freqs_jf, freqs_ca; rtol=1.0e-5)
|