def test_freq_Stiffener1D():
print('Testing frequency analysis for StiffPanelBay with a 1D Stiffener')
spb = StiffPanelBay()
spb.a = 1.
spb.b = 0.5
spb.stack = [0, 90, 90, 0]
spb.plyt = 1e-3*0.125
spb.laminaprop = (142.5e9, 8.7e9, 0.28, 5.1e9, 5.1e9, 5.1e9)
spb.model = 'plate_clt_donnell_bardell'
spb.mu = 1.3e3
spb.m = 15
spb.n = 16
spb.add_panel(y1=0, y2=spb.b/2., plyt=spb.plyt)
spb.add_panel(y1=spb.b/2., y2=spb.b, plyt=spb.plyt)
spb.add_bladestiff1d(ys=spb.b/2., Fx=0., bf=0.08, fstack=[0, 90, 90, 0]*5,
fplyt=spb.plyt, flaminaprop=spb.laminaprop)
spb.freq(silent=True, atype=4)
assert np.isclose(spb.eigvals[0].real, 81.9342050889)
def test_Lee_and_Lee_table4():
print('Testing Lee and Lee Table 4')
# Lee and Lee. "Vibration analysis of anisotropic plates with eccentric
# stiffeners". Computers & Structures, Vol. 57, No. 1, pp. 99-105,
# 1995.
models = (
('model4', 0.00208, 0.0060, 138.801067988),
('model5', 0.00260, 0.0075, 174.624343202),
('model7', 0.00364, 0.0105, 205.433509024))
for model, hf, bf, value in models:
spb = StiffPanelBay()
spb.model = 'plate_clt_donnell_bardell'
spb.mu = 1.500e3 # plate material density in kg / m^3
spb.laminaprop = (128.e9, 11.e9, 0.25, 4.48e9, 1.53e9, 1.53e9)
spb.stack = [0, -45, +45, 90, 90, +45, -45, 0]
plyt = 0.00013
spb.plyt = plyt
spb.a = 0.5
spb.b = 0.250
spb.m = 14
spb.n = 15
hf = hf
bf = bf
n = int(hf/plyt)
fstack = [0]*(n//4) + [90]*(n//4) + [90]*(n//4) + [0]*(n//4)
# clamping
spb.w1rx = 0.
spb.w2rx = 0.
spb.w1ry = 0.
spb.w2ry = 0.
spb.add_panel(y1=0, y2=spb.b/2.)
spb.add_panel(y1=spb.b/2., y2=spb.b)
spb.add_bladestiff1d(mu=spb.mu, ys=spb.b/2., bb=0., bf=bf,
fstack=fstack, fplyt=plyt, flaminaprop=spb.laminaprop)
spb.freq(atype=4, silent=True, reduced_dof=False)
assert np.isclose(spb.eigvals[0].real/2/np.pi, value)
def test_freq_models():
print('Testing frequency analysis for StiffPanelBay with 2 plates')
# From Table 4 of
# Lee and Lee. "Vibration analysis of anisotropic plates with eccentric
# stiffeners". Computers & Structures, Vol. 57, No. 1, pp. 99-105,
# 1995.
for model in ['plate_clt_donnell_bardell',
'cpanel_clt_donnell_bardell',
'kpanel_clt_donnell_bardell']:
spb = StiffPanelBay()
spb.a = 0.5
spb.b = 0.250
spb.plyt = 0.00013
spb.laminaprop = (128.e9, 11.e9, 0.25, 4.48e9, 1.53e9, 1.53e9)
spb.stack = [0, -45, +45, 90, 90, +45, -45, 0]
spb.model = model
spb.r = 1.e6
spb.alphadeg = 0.
spb.mu = 1.5e3
spb.m = 9
spb.n = 10
# clamping
spb.w1rx = 0.
spb.w2rx = 0.
spb.w1ry = 0.
spb.w2ry = 0.
spb.add_panel(0, spb.b/2., plyt=spb.plyt)
spb.add_panel(spb.b/2., spb.b, plyt=spb.plyt)
spb.freq(sparse_solver=True, silent=True)
ref = [85.12907802-0.j, 134.16422850-0.j, 206.77295186-0.j,
216.45992453-0.j, 252.24546171-0.j]
assert np.allclose(spb.eigvals[:5]/2/np.pi, ref)
