suzanne.soy/FreeCAD
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

FEM: Z88: add import and export of Z88 meshes

Browse Source
This commit is contained in:
Bernd Hahnebach 2016-05-14 19:46:14 +01:00 committed by wmayer
parent 004f757ab7
commit d96ead53f6
4 changed files with 441 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/Mod/Fem/App/CMakeLists.txt
View File

@ -98,6 +98,7 @@ SET(FemScripts_SRCS
ccxDatReader.py
ccxFrdReader.py
convert2TetGen.py
importZ88Mesh.py
Init.py
InitGui.py
FemAnalysis.py

2
src/Mod/Fem/CMakeLists.txt
View File

@ -67,6 +67,8 @@ INSTALL(
_TaskPanelFemSolverCalculix.py
TaskPanelFemSolverCalculix.ui
importZ88Mesh.py
DESTINATION
Mod/Fem
)

2
src/Mod/Fem/Init.py
View File

@ -34,3 +34,5 @@ FreeCAD.addImportType("FEM formats (*.unv *.med *.dat *.bdf)", "Fem")
FreeCAD.addExportType("FEM formats (*.unv *.med *.dat *.inp)", "Fem")
FreeCAD.addImportType("CalculiX result (*.frd)", "ccxFrdReader")
FreeCAD.addImportType("Abaqus file (*.inp)", "FemGui")
FreeCAD.addImportType("Z88 mesh file (*.txt)", "importZ88Mesh")
FreeCAD.addExportType("Z88 mesh file (*.txt)", "importZ88Mesh")

436
src/Mod/Fem/importZ88Mesh.py Normal file
View File

@ -0,0 +1,436 @@
# ***************************************************************************
# * *
# * Copyright (c) 2016 - Bernd Hahnebach <bernd@bimstatik.org> *
# * *
# * This program is free software; you can redistribute it and/or modify *
# * it under the terms of the GNU Lesser General Public License (LGPL) *
# * as published by the Free Software Foundation; either version 2 of *
# * the License, or (at your option) any later version. *
# * for detail see the LICENCE text file. *
# * *
# * This program is distributed in the hope that it will be useful, *
# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
# * GNU Library General Public License for more details. *
# * *
# * You should have received a copy of the GNU Library General Public *
# * License along with this program; if not, write to the Free Software *
# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
# * USA *
# * *
# ***************************************************************************
import FreeCAD
import os
import FemMeshTools
__title__ = "FreeCAD Z88 Mesh reader and writer"
__author__ = "Bernd Hahnebach "
__url__ = "http://www.freecadweb.org"
Debug = False
if open.__module__ == '__builtin__':
pyopen = open # because we'll redefine open below
def open(filename):
"called when freecad opens a file"
docname = os.path.splitext(os.path.basename(filename))[0]
insert(filename, docname)
def insert(filename, docname):
"called when freecad wants to import a file"
try:
doc = FreeCAD.getDocument(docname)
except NameError:
doc = FreeCAD.newDocument(docname)
FreeCAD.ActiveDocument = doc
import_z88_mesh(filename)
def import_z88_mesh(filename, analysis=None):
'''insert a FreeCAD FEM Mesh object in the ActiveDocument
'''
mesh_data = read_z88_mesh(filename)
mesh_name = os.path.basename(os.path.splitext(filename)[0])
femmesh = FemMeshTools.make_femmesh(mesh_data)
if femmesh:
mesh_object = FreeCAD.ActiveDocument.addObject('Fem::FemMeshObject', mesh_name)
mesh_object.FemMesh = femmesh
def read_z88_mesh(z88_mesh_input):
''' reads a z88 mesh file z88i1.txt (Z88OSV14) or z88structure.txt (Z88AuroraV3)
and extracts the nodes and elements
'''
nodes = {}
elements_hexa8 = {}
elements_penta6 = {}
elements_tetra4 = {}
elements_tetra10 = {}
elements_penta15 = {}
elements_hexa20 = {}
elements_tria3 = {}
elements_tria6 = {}
elements_quad4 = {}
elements_quad8 = {}
elements_seg2 = {}
input_continues = False
# elem = -1
z88_element_type = 0
z88_mesh_file = pyopen(z88_mesh_input, "r")
mesh_info = z88_mesh_file.readline().strip().split()
nodes_dimension = int(mesh_info[0])
nodes_count = int(mesh_info[1])
elements_count = int(mesh_info[2])
kflag = int(mesh_info[4])
if kflag: # for non rotational elements ist --> kflag = 0 --> karthesian, kflag = 1 polar koordinates
FreeCAD.Console.PrintError("KFLAG = 1, Rotational koordinates not supported at the moment\n")
return {}
nodes_first_line = 2 # first line is mesh_info
nodes_last_line = nodes_count + 1
elemts_first_line = nodes_last_line + 1
elements_last_line = elemts_first_line - 1 + elements_count * 2
if Debug:
print(nodes_count)
print(elements_count)
print(nodes_last_line)
print(elemts_first_line)
print(elements_last_line)
z88_mesh_file.seek(0) # go back to the beginning of the file
for no, line in enumerate(z88_mesh_file):
lno = no + 1
linecolumns = line.split()
if lno >= nodes_first_line and lno <= nodes_last_line:
# node line
node_no = int(linecolumns[0])
node_x = float(linecolumns[2])
node_y = float(linecolumns[3])
if nodes_dimension == 2:
node_z = 0.0
elif nodes_dimension == 3:
node_z = float(linecolumns[4])
nodes[node_no] = FreeCAD.Vector(node_x, node_y, node_z)
if lno >= elemts_first_line and lno <= elements_last_line:
# first element line
if not input_continues:
elem_no = int(linecolumns[0])
z88_element_type = int(linecolumns[1])
input_continues = True
# second element line
elif input_continues:
# not supported elements
if z88_element_type == 8:
# torus8
FreeCAD.Console.PrintError("Z88 Element No. 8, torus8\n")
FreeCAD.Console.PrintError("Rotational elements are not supported at the moment\n")
return {}
elif z88_element_type == 12:
# torus12
FreeCAD.Console.PrintError("Z88 Element No. 12, torus12\n")
FreeCAD.Console.PrintError("Rotational elements are not supported at the moment\n")
return {}
elif z88_element_type == 15:
# torus6
FreeCAD.Console.PrintError("Z88 Element No. 15, torus6\n")
FreeCAD.Console.PrintError("Rotational elements are not supported at the moment\n")
return {}
elif z88_element_type == 19:
# platte16
FreeCAD.Console.PrintError("Z88 Element No. 19, platte16\n")
FreeCAD.Console.PrintError("Not supported at the moment\n")
return {}
elif z88_element_type == 21:
# schale16, mixture made from hexa8 und hexa20 (thickness is linear)
FreeCAD.Console.PrintError("Z88 Element No. 21, schale16\n")
FreeCAD.Console.PrintError("Not supported at the moment\n")
return {}
elif z88_element_type == 22:
# schale12, mixtrue made from prism6 and prism15 (thickness is linear)
FreeCAD.Console.PrintError("Z88 Element No. 22, schale12\n")
FreeCAD.Console.PrintError("Not supported at the moment\n")
return {}
# supported elements
elif z88_element_type == 2 or z88_element_type == 4 or z88_element_type == 5 or z88_element_type == 9 or z88_element_type == 13 or z88_element_type == 25:
# stab4 or stab5 or welle5 or beam13 or beam25 Z88 --> seg2 FreeCAD
# N1, N2
nd1 = int(linecolumns[0])
nd2 = int(linecolumns[1])
elements_seg2[elem_no] = (nd1, nd2)
input_continues = False
elif z88_element_type == 3 or z88_element_type == 14 or z88_element_type == 24:
# scheibe3 or scheibe14 or schale24 Z88 --> tria6 FreeCAD
# N1, N2, N3, N4, N5, N6
nd1 = int(linecolumns[0])
nd2 = int(linecolumns[1])
nd3 = int(linecolumns[2])
nd4 = int(linecolumns[3])
nd5 = int(linecolumns[4])
nd6 = int(linecolumns[5])
elements_tria6[elem_no] = (nd1, nd2, nd3, nd4, nd5, nd6)
input_continues = False
elif z88_element_type == 7 or z88_element_type == 20 or z88_element_type == 23:
# scheibe7 or platte20 or schale23 Z88 --> quad8 FreeCAD
# N1, N2, N3, N4, N5, N6, N7, N8
nd1 = int(linecolumns[0])
nd2 = int(linecolumns[1])
nd3 = int(linecolumns[2])
nd4 = int(linecolumns[3])
nd5 = int(linecolumns[4])
nd6 = int(linecolumns[5])
nd7 = int(linecolumns[6])
nd8 = int(linecolumns[7])
elements_quad8[elem_no] = (nd1, nd2, nd3, nd4, nd5, nd6, nd7, nd8)
input_continues = False
elif z88_element_type == 17:
# volume17 Z88 --> tetra4 FreeCAD
# N4, N2, N3, N1
nd1 = int(linecolumns[0])
nd2 = int(linecolumns[1])
nd3 = int(linecolumns[2])
nd4 = int(linecolumns[3])
elements_tetra4[elem_no] = (nd4, nd2, nd3, nd1)
input_continues = False
elif z88_element_type == 16:
# volume16 Z88 --> tetra10 FreeCAD
# N4, N2, N3, N1, N9, N6, N10, N5, N7, N8
nd1 = int(linecolumns[0])
nd2 = int(linecolumns[1])
nd3 = int(linecolumns[2])
nd4 = int(linecolumns[3])
nd5 = int(linecolumns[4])
nd6 = int(linecolumns[5])
nd7 = int(linecolumns[6])
nd8 = int(linecolumns[7])
nd9 = int(linecolumns[8])
nd10 = int(linecolumns[9])
elements_tetra10[elem_no] = (nd4, nd2, nd3, nd1, nd9, nd6, nd10, nd5, nd7, nd8)
input_continues = False
elif z88_element_type == 1:
# volume1 Z88 --> hexa8 FreeCAD
# N1, N2, N3, N4, N5, N6, N7, N8
nd1 = int(linecolumns[0])
nd2 = int(linecolumns[1])
nd3 = int(linecolumns[2])
nd4 = int(linecolumns[3])
nd5 = int(linecolumns[4])
nd6 = int(linecolumns[5])
nd7 = int(linecolumns[6])
nd8 = int(linecolumns[7])
elements_hexa8[elem_no] = (nd1, nd2, nd3, nd4, nd5, nd6, nd7, nd8)
input_continues = False
elif z88_element_type == 10:
# volume10 Z88 --> hexa20 FreeCAD
# N2, N3, N4, N1, N6, N7, N8, N5, N10, N11, N12, N9, N14, N15, N16, N13, N18, N19, N20, N17
# or turn by 90 degree and they match !
# N1, N2, N3, N4, N5, N6, N7, N8, N9, N10, N11, N12, N13, N14, N15, N16, N17, N18, N19, N20
nd1 = int(linecolumns[0])
nd2 = int(linecolumns[1])
nd3 = int(linecolumns[2])
nd4 = int(linecolumns[3])
nd5 = int(linecolumns[4])
nd6 = int(linecolumns[5])
nd7 = int(linecolumns[6])
nd8 = int(linecolumns[7])
nd9 = int(linecolumns[8])
nd10 = int(linecolumns[9])
nd11 = int(linecolumns[10])
nd12 = int(linecolumns[11])
nd13 = int(linecolumns[12])
nd14 = int(linecolumns[13])
nd15 = int(linecolumns[14])
nd16 = int(linecolumns[15])
nd17 = int(linecolumns[16])
nd18 = int(linecolumns[17])
nd19 = int(linecolumns[18])
nd20 = int(linecolumns[19])
elements_hexa20[elem_no] = (nd1, nd2, nd3, nd4, nd5, nd6, nd7, nd8, nd9, nd10,
nd11, nd12, nd13, nd14, nd15, nd16, nd17, nd18, nd19, nd20)
input_continues = False
# not known elements, some example have -1 for some teaching reasons to show some other stuff
else:
FreeCAD.Console.PrintError("Not known element\n")
return {}
if Debug:
for n in nodes:
print(n, ' ', nodes[n])
for e in elements_tria6:
print(e, ' ', elements_tria6[e])
z88_mesh_file.close()
return {'Nodes': nodes,
'Hexa8Elem': elements_hexa8, 'Penta6Elem': elements_penta6, 'Tetra4Elem': elements_tetra4, 'Tetra10Elem': elements_tetra10,
'Penta15Elem': elements_penta15, 'Hexa20Elem': elements_hexa20, 'Tria3Elem': elements_tria3, 'Tria6Elem': elements_tria6,
'Quad4Elem': elements_quad4, 'Quad8Elem': elements_quad8, 'Seg2Elem': elements_seg2,
}
# export z88 Mesh
def export(objectslist, filename):
"called when freecad exports a file"
if len(objectslist) != 1:
FreeCAD.Console.PrintError("This exporter can only export one object.\n")
return
obj = objectslist[0]
if not obj.isDerivedFrom("Fem::FemMeshObject"):
FreeCAD.Console.PrintError("No FEM mesh object selected.\n")
return
femnodes_mesh = obj.FemMesh.Nodes
femelement_table = FemMeshTools.get_femelement_table(obj.FemMesh)
z88_element_type = get_z88_element_type(obj.FemMesh, femelement_table)
f = pyopen(filename, "wb")
write_z88_mesh_to_file(femnodes_mesh, femelement_table, z88_element_type, f)
f.close()
def write_z88_mesh_to_file(femnodes_mesh, femelement_table, z88_element_type, f):
node_dimension = 3 # 2 for 2D not supported
if (z88_element_type == 4 or
z88_element_type == 17 or z88_element_type == 16 or
z88_element_type == 1 or z88_element_type == 10):
node_dof = 3
elif z88_element_type == 23 or z88_element_type == 24:
node_dof = 6 # schalenelemente
else:
print("Error: wrong z88_element_type")
return
node_count = len(femnodes_mesh)
element_count = len(femelement_table)
dofs = node_dof * node_count
unknown_flag = 0
written_by = "written by FreeCAD"
# first line, some z88 specific stuff
f.write("{0} {1} {2} {3} {4} {5}\n".format(node_dimension, node_count, element_count, dofs, unknown_flag, written_by))
# nodes
for node in femnodes_mesh:
vec = femnodes_mesh[node]
f.write("{0} {1} {2:.6f} {3:.6f} {4:.6f}\n".format(node, node_dof, vec.x, vec.y, vec.z, node))
# elements
for element in femelement_table:
# z88_element_type is checked for every element, but mixed elements are not supported up to date
n = femelement_table[element]
if z88_element_type == 2 or z88_element_type == 4 or z88_element_type == 5 or z88_element_type == 9 or z88_element_type == 13 or z88_element_type == 25:
# seg2 FreeCAD --> stab4 Z88
# N1, N2
f.write("{0} {1}\n".format(element, z88_element_type, element))
f.write("{0} {1}\n".format(
n[0], n[1]))
elif z88_element_type == 3 or z88_element_type == 14 or z88_element_type == 24:
# tria6 FreeCAD --> schale24 Z88
# N1, N2, N3, N4, N5, N6
f.write("{0} {1}\n".format(element, z88_element_type, element))
f.write("{0} {1} {2} {3} {4} {5}\n".format(
n[0], n[1], n[2], n[3], n[4], n[5]))
elif z88_element_type == 7 or z88_element_type == 20 or z88_element_type == 23:
# quad8 FreeCAD --> schale23 Z88
# N1, N2, N3, N4, N5, N6, N7, N8
f.write("{0} {1}\n".format(element, z88_element_type, element))
f.write("{0} {1} {2} {3} {4} {5} {6} {7}\n".format(
n[0], n[1], n[2], n[3], n[4], n[5], n[6], n[7]))
elif z88_element_type == 17:
# tetra4 FreeCAD --> volume17 Z88#
# N4, N2, N3, N1
f.write("{0} {1}\n".format(element, z88_element_type, element))
f.write("{0} {1} {2} {3}\n".format(
n[3], n[1], n[2], n[0]))
elif z88_element_type == 16:
# tetra10 FreeCAD --> volume16 Z88
# N4, N2, N3, N1, N9, N6, N10, N5, N7, N8
f.write("{0} {1}\n".format(element, z88_element_type, element))
f.write("{0} {1} {2} {3} {4} {5} {6} {7} {8} {9}\n".format(
n[3], n[1], n[2], n[0], n[8], n[5], n[9], n[4], n[6], n[7]))
elif z88_element_type == 1:
# hexa8 FreeCAD --> volume1 Z88
# N1, N2, N3, N4, N5, N6, N7, N8
f.write("{0} {1}\n".format(element, z88_element_type, element))
f.write("{0} {1} {2} {3} {4} {5} {6} {7}\n".format(
n[0], n[1], n[2], n[3], n[4], n[5], n[6], n[7]))
elif z88_element_type == 10:
# hexa20 FreeCAD --> volume10 Z88
# N2, N3, N4, N1, N6, N7, N8, N5, N10, N11, N12, N9, N14, N15, N16, N13, N18, N19, N20, N17
# or turn by 90 degree and they match !
# N1, N2, N3, N4, N5, N6, N7, N8, N9, N10, N11, N12, N13, N14, N15, N16, N17, N18, N19, N20
f.write("{0} {1}\n".format(element, z88_element_type, element))
f.write("{0} {1} {2} {3} {4} {5} {6} {7} {8} {9} {10} {11} {12} {13} {14} {15} {16} {17} {18} {19}\n".format(
n[0], n[1], n[2], n[3], n[4], n[5], n[6], n[7], n[8], n[9], n[10], n[11], n[12], n[13], n[14], n[15], n[16], n[17], n[18], n[19]))
else:
FreeCAD.Console.PrintError("Writing of Z88 elementtype {0} not supported.\n".format(z88_element_type))
# TODO support schale12 (made from prism15) and schale16 (made from hexa20)
return
# Helper
def get_z88_element_type(femmesh, femelement_table=None):
if not femmesh:
print("Error: No femmesh!")
if not femelement_table:
print("We need to get the femelement_table first!")
femelement_table = FemMeshTools.get_femelement_table(femmesh)
# in some cases lowest key in femelement_table is not [1]
for elem in sorted(femelement_table):
elem_length = len(femelement_table[elem])
print elem_length
break # break after the first elem
if FemMeshTools.is_solid_femmesh(femmesh):
if femmesh.TetraCount == femmesh.VolumeCount:
if elem_length == 4:
return 17
elif elem_length == 10:
return 16
else:
print('Tetra with neiter 4 nor 10 nodes')
elif femmesh.HexaCount == femmesh.VolumeCount:
if elem_length == 8:
return 1
elif elem_length == 20:
return 10
else:
print('Hexa with neither 8 nor 20 nodes')
return 0
else:
print('no tetra, no hexa or Mixed Volume Elements')
elif FemMeshTools.is_face_femmesh(femmesh):
if femmesh.TriangleCount == femmesh.FaceCount:
if elem_length == 3:
print('tria3mesh, not supported by z88')
return 0
elif elem_length == 6:
return 24
else:
print('Tria with neither 3 nor 6 nodes')
return 0
elif femmesh.QuadrangleCount == femmesh.FaceCount:
if elem_length == 4:
print('quad4mesh, not supported by z88')
return 0
elif elem_length == 8:
return 23
else:
print('Quad with neiter 4 nor 8 nodes')
return 0
else:
print('no tria, no quad')
return 0
elif FemMeshTools.is_edge_femmesh(femmesh):
print('Edge femmesh will be exported as 3D truss element nr 4')
return 4
else:
print('Neither, edge, face or solid femmesh')
return 0
return 0