465 lines
22 KiB
Python
465 lines
22 KiB
Python
#***************************************************************************
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#* *
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#* Copyright (c) 2015 - Przemo Firszt <przemo@firszt.eu> *
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#* *
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#* This program is free software; you can redistribute it and/or modify *
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#* it under the terms of the GNU Lesser General Public License (LGPL) *
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#* as published by the Free Software Foundation; either version 2 of *
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#* the License, or (at your option) any later version. *
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#* for detail see the LICENCE text file. *
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#* *
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#* This program is distributed in the hope that it will be useful, *
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#* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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#* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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#* GNU Library General Public License for more details. *
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#* *
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#* You should have received a copy of the GNU Library General Public *
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#* License along with this program; if not, write to the Free Software *
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#* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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#* USA *
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#* *
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#***************************************************************************
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import FreeCAD
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from PySide import QtCore
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class FemTools(QtCore.QRunnable, QtCore.QObject):
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finished = QtCore.Signal(int)
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known_analysis_types = ["static", "frequency"]
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## The constructor
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# @param analysis - analysis object to be used as the core object.
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# @param test_mode - True indicates that no real calculations will take place, so ccx bianry is not required. Used by test module.
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# "__init__" tries to use current active analysis in analysis is left empty.
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# Rises exception if analysis is not set and there is no active analysis
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def __init__(self, analysis=None, test_mode=False):
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QtCore.QRunnable.__init__(self)
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QtCore.QObject.__init__(self)
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if analysis:
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## @var analysis
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# FEM analysis - the core object. Has to be present.
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# It's set to analysis passed in "__init__" or set to current active analysis by default if nothing has been passed to "__init__".
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self.analysis = analysis
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else:
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import FemGui
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self.analysis = FemGui.getActiveAnalysis()
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if self.analysis:
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self.update_objects()
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self.set_analysis_type()
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self.set_eigenmode_parameters()
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## @var base_name
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# base name of .inp/.frd file (without extension). It is used to construct .inp file path that is passed to CalculiX ccx
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self.base_name = ""
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## @var results_present
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# boolean variable indicating if there are calculation results ready for use
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self.results_present = False
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self.setup_working_dir()
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if test_mode:
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self.ccx_binary_present = True
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else:
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self.ccx_binary_present = False
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self.setup_ccx()
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else:
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raise Exception('FEM: No active analysis found!')
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## Removes all result objects
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# @param self The python object self
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def purge_results(self):
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for m in self.analysis.Member:
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if (m.isDerivedFrom('Fem::FemResultObject')):
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self.analysis.Document.removeObject(m.Name)
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self.results_present = False
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## Resets mesh deformation
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# @param self The python object self
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def reset_mesh_deformation(self):
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if self.mesh:
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self.mesh.ViewObject.applyDisplacement(0.0)
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## Resets mesh color
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# @param self The python object self
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def reset_mesh_color(self):
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if self.mesh:
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self.mesh.ViewObject.NodeColor = {}
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self.mesh.ViewObject.ElementColor = {}
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self.mesh.ViewObject.setNodeColorByScalars()
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## Resets mesh color, deformation and removes all result objects
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# @param self The python object self
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def reset_all(self):
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self.purge_results()
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self.reset_mesh_color()
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self.reset_mesh_deformation()
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## Sets mesh color using selected type of results (Sabs by default)
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# @param self The python object self
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# @param result_type Type of FEM result, allowed are:
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# - U1, U2, U3 - deformation
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# - Uabs - absolute deformation
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# - Sabs - Von Mises stress
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# @param limit cutoff value. All values over the limit are treated as equel to the limit. Useful for filtering out hot spots.
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def show_result(self, result_type="Sabs", limit=None):
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self.update_objects()
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if result_type == "None":
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self.reset_mesh_color()
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return
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if self.result_object:
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if result_type == "Sabs":
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values = self.result_object.StressValues
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elif result_type == "Uabs":
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values = self.result_object.DisplacementLengths
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else:
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match = {"U1": 0, "U2": 1, "U3": 2}
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d = zip(*self.result_object.DisplacementVectors)
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values = list(d[match[result_type]])
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self.show_color_by_scalar_with_cutoff(values, limit)
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## Sets mesh color using list of values. Internally used by show_result function.
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# @param self The python object self
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# @param values list of values
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# @param limit cutoff value. All values over the limit are treated as equel to the limit. Useful for filtering out hot spots.
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def show_color_by_scalar_with_cutoff(self, values, limit=None):
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if limit:
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filtered_values = []
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for v in values:
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if v > limit:
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filtered_values.append(limit)
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else:
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filtered_values.append(v)
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else:
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filtered_values = values
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self.mesh.ViewObject.setNodeColorByScalars(self.result_object.ElementNumbers, filtered_values)
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def show_displacement(self, displacement_factor=0.0):
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self.mesh.ViewObject.setNodeDisplacementByVectors(self.result_object.ElementNumbers,
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self.result_object.DisplacementVectors)
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self.mesh.ViewObject.applyDisplacement(displacement_factor)
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def update_objects(self):
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# [{'Object':material}, {}, ...]
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# [{'Object':fixed_constraints, 'NodeSupports':bool}, {}, ...]
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# [{'Object':force_constraints, 'NodeLoad':value}, {}, ...
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# [{'Object':pressure_constraints, 'xxxxxxxx':value}, {}, ...]
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# [{'Object':beam_sections, 'xxxxxxxx':value}, {}, ...]
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# [{'Object':shell_thicknesses, 'xxxxxxxx':value}, {}, ...]
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## @var mesh
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# mesh of the analysis. Used to generate .inp file and to show results
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self.mesh = None
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self.material = []
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## @var fixed_constraints
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# set of fixed constraints from the analysis. Updated with update_objects
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# Individual constraints are "Fem::ConstraintFixed" type
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self.fixed_constraints = []
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## @var force_constraints
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# set of force constraints from the analysis. Updated with update_objects
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# Individual constraints are "Fem::ConstraintForce" type
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self.force_constraints = []
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## @var pressure_constraints
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# set of pressure constraints from the analysis. Updated with update_objects
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# Individual constraints are "Fem::ConstraintPressure" type
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self.pressure_constraints = []
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self.beam_sections = []
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self.shell_thicknesses = []
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for m in self.analysis.Member:
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if m.isDerivedFrom("Fem::FemMeshObject"):
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self.mesh = m
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elif m.isDerivedFrom("App::MaterialObjectPython"):
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material_dict = {}
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material_dict['Object'] = m
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self.material.append(material_dict)
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elif m.isDerivedFrom("Fem::ConstraintFixed"):
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fixed_constraint_dict = {}
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fixed_constraint_dict['Object'] = m
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self.fixed_constraints.append(fixed_constraint_dict)
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elif m.isDerivedFrom("Fem::ConstraintForce"):
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force_constraint_dict = {}
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force_constraint_dict['Object'] = m
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self.force_constraints.append(force_constraint_dict)
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elif m.isDerivedFrom("Fem::ConstraintPressure"):
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PressureObjectDict = {}
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PressureObjectDict['Object'] = m
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self.pressure_constraints.append(PressureObjectDict)
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elif hasattr(m, "Proxy") and m.Proxy.Type == 'FemBeamSection':
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beam_section_dict = {}
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beam_section_dict['Object'] = m
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self.beam_sections.append(beam_section_dict)
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elif hasattr(m, "Proxy") and m.Proxy.Type == 'FemShellThickness':
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shell_thickness_dict = {}
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shell_thickness_dict['Object'] = m
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self.shell_thicknesses.append(shell_thickness_dict)
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def check_prerequisites(self):
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message = ""
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if not self.analysis:
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message += "No active Analysis\n"
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if self.analysis_type not in self.known_analysis_types:
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message += "Unknown analysis type: {}\n".format(self.analysis_type)
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if not self.working_dir:
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message += "Working directory not set\n"
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import os
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if not (os.path.isdir(self.working_dir)):
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message += "Working directory \'{}\' doesn't exist.".format(self.working_dir)
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if not self.mesh:
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message += "No mesh object in the Analysis\n"
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if not self.material:
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message += "No material object in the Analysis\n"
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if not self.fixed_constraints:
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message += "No fixed-constraint nodes defined in the Analysis\n"
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if self.analysis_type == "static":
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if not (self.force_constraints or self.pressure_constraints):
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message += "No force-constraint or pressure-constraint defined in the Analysis\n"
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if self.beam_sections:
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has_no_references = False
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for b in self.beam_sections:
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if len(b['Object'].References) == 0:
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if has_no_references is True:
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message += "More than one BeamSection has empty References list (Only one empty References list is allowed!).\n"
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has_no_references = True
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if self.shell_thicknesses:
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has_no_references = False
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for s in self.shell_thicknesses:
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if len(s['Object'].References) == 0:
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if has_no_references is True:
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message += "More than one ShellThickness has empty References list (Only one empty References list is allowed!).\n"
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has_no_references = True
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return message
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def write_inp_file(self):
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import ccxInpWriter as iw
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import sys
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self.inp_file_name = ""
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try:
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inp_writer = iw.inp_writer(self.analysis, self.mesh, self.material,
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self.fixed_constraints,
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self.force_constraints, self.pressure_constraints,
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self.beam_sections, self.shell_thicknesses,
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self.analysis_type, self.eigenmode_parameters,
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self.working_dir)
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self.inp_file_name = inp_writer.write_calculix_input_file()
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except:
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print "Unexpected error when writing CalculiX input file:", sys.exc_info()[0]
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raise
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def start_ccx(self):
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import multiprocessing
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import os
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import subprocess
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self.ccx_stdout = ""
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self.ccx_stderr = ""
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if self.inp_file_name != "" and self.ccx_binary_present:
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ont_backup = os.environ.get('OMP_NUM_THREADS')
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if not ont_backup:
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ont_backup = ""
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_env = os.putenv('OMP_NUM_THREADS', str(multiprocessing.cpu_count()))
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# change cwd because ccx may crash if directory has no write permission
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# there is also a limit of the length of file names so jump to the document directory
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cwd = QtCore.QDir.currentPath()
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f = QtCore.QFileInfo(self.inp_file_name)
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QtCore.QDir.setCurrent(f.path())
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p = subprocess.Popen([self.ccx_binary, "-i ", f.baseName()],
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stdout=subprocess.PIPE, stderr=subprocess.PIPE,
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shell=False, env=_env)
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self.ccx_stdout, self.ccx_stderr = p.communicate()
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os.putenv('OMP_NUM_THREADS', ont_backup)
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QtCore.QDir.setCurrent(cwd)
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return p.returncode
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return -1
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## Sets eigenmode parameters for CalculiX frequency analysis
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# @param self The python object self
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# @param number number of eigenmodes that wll be calculated, default read for FEM prefs or 10 if not set in the FEM prefs
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# @param limit_low lower value of requested eigenfrequency range, default read for FEM prefs or 0.0 if not set in the FEM prefs
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# @param limit_high higher value of requested eigenfrequency range, default 1000000.0
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def set_eigenmode_parameters(self, number=None, limit_low=None, limit_high=1000000.0):
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self.fem_prefs = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Mod/Fem")
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if number is not None:
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_number = number
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else:
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try:
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_number = self.analysis.NumberOfEigenmodes
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except:
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#Not yet in prefs, so it will always default to 10
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_number = self.fem_prefs.GetString("NumberOfEigenmodes", 10)
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if _number < 1:
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_number = 1
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if limit_low is not None:
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_limit_low = limit_low
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else:
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try:
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_limit_low = self.analysis.EigenmodeLowLimit
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except:
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#Not yet in prefs, so it will always default to 0.0
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_limit_low = self.fem_prefs.GetString("EigenmodeLowLimit", 0.0)
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self.eigenmode_parameters = (_number, _limit_low, limit_high)
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## Sets base_name
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# @param self The python object self
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# @param base_name base name of .inp/.frd file (without extension). It is used to construct .inp file path that is passed to CalculiX ccx
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def set_base_name(self, base_name=None):
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if base_name is None:
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self.base_name = ""
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else:
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self.base_name = base_name
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# Update inp file name
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self.set_inp_file_name()
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## Sets inp file name that is used to determine location and name of frd result file.
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# Normally inp file name is set set by write_inp_file
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# Can be used to read mock calculations file
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# @param self The python object self
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# @inp_file_name .inp file name. If empty the .inp file path is constructed from working_dir, base_name and string ".inp"
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def set_inp_file_name(self, inp_file_name=None):
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if inp_file_name is not None:
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self.inp_file_name = inp_file_name
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else:
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self.inp_file_name = self.working_dir + '/' + self.base_name + '.inp'
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## Sets analysis type.
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# @param self The python object self
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# @param analysis_type type of the analysis. Allowed values are:
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# - static
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# - frequency
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def set_analysis_type(self, analysis_type=None):
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if analysis_type is not None:
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self.analysis_type = analysis_type
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else:
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try:
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self.analysis_type = self.analysis.AnalysisType
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except:
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self.fem_prefs = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Mod/Fem")
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self.analysis_type = self.fem_prefs.GetString("AnalysisType", "static")
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## Sets working dir for ccx execution. Called with no working_dir uses WorkingDir from FEM preferences
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# @param self The python object self
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# @working_dir directory to be used for writing .inp file and executing CalculiX ccx
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def setup_working_dir(self, working_dir=None):
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import os
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if working_dir is not None:
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self.working_dir = working_dir
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else:
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try:
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self.working_dir = self.analysis.WorkingDir
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except:
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FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Mod/Fem").GetString("WorkingDir")
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self.working_dir = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Mod/Fem").GetString("WorkingDir")
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if not (os.path.isdir(self.working_dir)):
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try:
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os.makedirs(self.working_dir)
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except:
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print ("Dir \'{}\' doesn't exist and cannot be created.".format(self.working_dir))
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import tempfile
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self.working_dir = tempfile.gettempdir()
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print ("Dir \'{}\' will be used instead.".format(self.working_dir))
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# Update inp file name
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self.set_inp_file_name()
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## Sets CalculiX ccx binary path and velidates if the binary can be executed
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# @param self The python object self
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# @ccx_binary path to ccx binary, default is guessed: "bin/ccx" windows, "ccx" for other systems
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# @ccx_binary_sig expected output form ccx when run empty. Default value is "CalculiX.exe -i jobname"
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def setup_ccx(self, ccx_binary=None, ccx_binary_sig="CalculiX"):
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if not ccx_binary:
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self.fem_prefs = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Mod/Fem")
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ccx_binary = self.fem_prefs.GetString("ccxBinaryPath", "")
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if not ccx_binary:
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from platform import system
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if system() == "Linux":
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ccx_binary = "ccx"
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elif system() == "Windows":
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ccx_binary = FreeCAD.getHomePath() + "bin/ccx.exe"
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else:
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ccx_binary = "ccx"
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self.ccx_binary = ccx_binary
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import subprocess
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try:
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p = subprocess.Popen([self.ccx_binary], stdout=subprocess.PIPE,
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stderr=subprocess.PIPE, shell=False)
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ccx_stdout, ccx_stderr = p.communicate()
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if ccx_binary_sig in ccx_stdout:
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self.ccx_binary_present = True
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except OSError, e:
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FreeCAD.Console.PrintError(e.message)
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if e.errno == 2:
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raise Exception("FEM: CalculiX binary ccx \'{}\' not found. Please set it in FEM preferences.".format(ccx_binary))
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except Exception as e:
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FreeCAD.Console.PrintError(e.message)
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raise Exception("FEM: CalculiX ccx \'{}\' output \'{}\' doesn't contain expected phrase \'{}\'. Please use ccx 2.6 or newer".
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format(ccx_binary, ccx_stdout, ccx_binary_sig))
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## Load results of ccx calculations from .frd file.
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# @param self The python object self
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def load_results(self):
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import ccxFrdReader
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import os
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self.results_present = False
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frd_result_file = os.path.splitext(self.inp_file_name)[0] + '.frd'
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if os.path.isfile(frd_result_file):
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ccxFrdReader.importFrd(frd_result_file, self.analysis)
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for m in self.analysis.Member:
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if m.isDerivedFrom("Fem::FemResultObject"):
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self.result_object = m
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if self.result_object is not None:
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self.results_present = True
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else:
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raise Exception('FEM: No results found at {}!'.format(frd_result_file))
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def use_results(self, results_name=None):
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for m in self.analysis.Member:
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if m.isDerivedFrom("Fem::FemResultObject") and m.Name == results_name:
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self.result_object = m
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break
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if not self.result_object:
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raise Exception("{} doesn't exist".format(results_name))
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def run(self):
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ret_code = 0
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message = self.check_prerequisites()
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if not message:
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self.write_inp_file()
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from FreeCAD import Base
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progress_bar = Base.ProgressIndicator()
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progress_bar.start("Running CalculiX ccx...", 0)
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ret_code = self.start_ccx()
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self.finished.emit(ret_code)
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progress_bar.stop()
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else:
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print "Running analysis failed! " + message
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if ret_code or self.ccx_stderr:
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print "Analysis failed with exit code {}".format(ret_code)
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print "--------start of stderr-------"
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print self.ccx_stderr
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print "--------end of stderr---------"
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print "--------start of stdout-------"
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print self.ccx_stdout
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print "--------end of stdout---------"
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## Returns minimum, average and maximum value for provided result type
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# @param self The python object self
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# @param result_type Type of FEM result, allowed are:
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# - U1, U2, U3 - deformation
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# - Uabs - absolute deformation
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# - Sabs - Von Mises stress
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# - None - always return (0.0, 0.0, 0.0)
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def get_stats(self, result_type):
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stats = (0.0, 0.0, 0.0)
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for m in self.analysis.Member:
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if m.isDerivedFrom("Fem::FemResultObject"):
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match = {"U1": (m.Stats[0], m.Stats[1], m.Stats[2]),
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"U2": (m.Stats[3], m.Stats[4], m.Stats[5]),
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"U3": (m.Stats[6], m.Stats[7], m.Stats[8]),
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"Uabs": (m.Stats[9], m.Stats[10], m.Stats[11]),
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"Sabs": (m.Stats[12], m.Stats[13], m.Stats[14]),
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"None": (0.0, 0.0, 0.0)}
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stats = match[result_type]
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return stats
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