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https://github.com/JuliaFEM/JuliaFEM.jl.git
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Jukka Aho
a2ae06bd47
New 33-line test file for modal analysis: - Tests modal analysis with Tet10 element - Validates zero eigenmodes (rigid body modes) - Tests eigenvalue computation for modal analysis - Uses legacy Element/Problem API Tests that modal analysis correctly identifies rigid body modes as zero eigenvalues.
34 lines
1.2 KiB
Julia
34 lines
1.2 KiB
Julia
# This file is a part of JuliaFEM.
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# License is MIT: see https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE.md
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using JuliaFEM, Test
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# zero eigenmode model
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X = Dict(
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1 => [2.0, 3.0, 4.0],
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2 => [6.0, 3.0, 2.0],
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3 => [2.0, 5.0, 1.0],
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4 => [4.0, 3.0, 6.0])
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X[5] = 1/2*(X[1] + X[2])
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X[6] = 1/2*(X[2] + X[3])
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X[7] = 1/2*(X[3] + X[1])
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X[8] = 1/2*(X[1] + X[4])
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X[9] = 1/2*(X[2] + X[4])
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X[10] = 1/2*(X[3] + X[4])
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element = Element(Tet10, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
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update!(element, "youngs modulus", 480.0)
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update!(element, "poissons ratio", 1/3)
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update!(element, "geometry", X)
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update!(element, "density", 105.0)
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body = Problem(Elasticity, "TET", 3)
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add_elements!(body, element)
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analysis = Analysis(Modal)
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add_problems!(analysis, body)
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analysis.properties.nev = 30
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run!(analysis)
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w2 = analysis.properties.eigvals
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w2_expected = [5.66054e-16, 1.08925e-15, 1.95035e-15, -2.18372e-15, -8.01069e-15, 9.26902e-15, 0.401407, 0.88248, 1.3185, 2.55833, 3.3538, 5.02371, 7.71933, 8.43733, 11.0521, 19.3262, 26.0944, 28.7033, 51.5814, 59.1422, 83.3597, 91.1507, 121.689, 126.753, 157.938, 160.344, 205.634, 324.608, 468.331]
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@test isapprox(w2, w2; atol=1.0e-4)
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