131 lines
4.8 KiB
Python
131 lines
4.8 KiB
Python
# SPDX-License-Identifier: LGPL-2.1-or-later
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# ***************************************************************************
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# * Copyright (c) 2025 Mario Passaglia <mpassaglia[at]cbc.uba.ar> *
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# * *
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# * This file is part of FreeCAD. *
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# * *
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# * FreeCAD is free software: you can redistribute it and/or modify it *
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# * under the terms of the GNU Lesser General Public License as *
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# * published by the Free Software Foundation, either version 2.1 of the *
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# * License, or (at your option) any later version. *
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# * *
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# * FreeCAD is distributed in the hope that it will be useful, but *
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# * WITHOUT ANY WARRANTY; without even the implied warranty of *
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# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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# * Lesser General Public License for more details. *
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# * *
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# * You should have received a copy of the GNU Lesser General Public *
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# * License along with FreeCAD. If not, see *
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# * <https://www.gnu.org/licenses/>. *
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# * *
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# ***************************************************************************
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__title__ = "FreeCAD FEM constraint electric charge density document object"
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__author__ = "Mario Passaglia"
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__url__ = "https://www.freecad.org"
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## @package constraint_electricchargedensity
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# \ingroup FEM
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# \brief constraint electric charge density object
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from FreeCAD import Units
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from . import base_fempythonobject
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_PropHelper = base_fempythonobject._PropHelper
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class ConstraintElectricChargeDensity(base_fempythonobject.BaseFemPythonObject):
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Type = "Fem::ConstraintElectricChargeDensity"
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def __init__(self, obj):
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super().__init__(obj)
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for prop in self._get_properties():
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prop.add_to_object(obj)
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def _get_properties(self):
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prop = []
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prop.append(
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_PropHelper(
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type="App::PropertyVolumeChargeDensity",
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name="SourceChargeDensity",
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group="Electric Charge Density",
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doc="Free electric charge per unit volume at the sources",
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value="0 C/mm^3",
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)
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)
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prop.append(
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_PropHelper(
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type="App::PropertySurfaceChargeDensity",
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name="InterfaceChargeDensity",
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group="Electric Charge Density",
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doc="Free electric charge per unit surface at the boundaries",
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value="0 C/mm^2",
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)
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)
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prop.append(
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_PropHelper(
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type="App::PropertyElectricCharge",
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name="TotalCharge",
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group="Electric Charge Density",
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doc="Total free electric charge",
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value="0 C",
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)
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)
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prop.append(
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_PropHelper(
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type="App::PropertyEnumeration",
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name="Mode",
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group="Electric Charge Density",
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doc="Switch quantity input mode",
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value=["Interface", "Source", "Total Interface", "Total Source"],
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)
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)
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return prop
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def get_total_source_density(self, obj):
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"""
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Calculate density for `Total Source` mode.
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"""
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size = 0
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items = []
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for feat, sub_elem in obj.References:
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for name in sub_elem:
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sub = feat.getSubObject(name)
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if sub.ShapeType == "Solid":
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size += sub.Volume
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items.append(name)
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elif sub.ShapeType == "Face":
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size += sub.Area
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items.append(name)
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if items:
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vol = Units.Quantity(f"{size} mm^3")
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return obj.TotalCharge / vol
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def get_total_interface_density(self, obj):
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"""
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Calculate density for `Total Interface` mode.
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"""
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size = 0
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items = []
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for feat, sub_elem in obj.References:
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for name in sub_elem:
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sub = feat.getSubObject(name)
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if sub.ShapeType == "Face":
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size += sub.Area
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items.append(name)
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elif sub.ShapeType == "Edge":
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size += sub.Length
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items.append(name)
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if items:
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area = Units.Quantity(f"{size} mm^2")
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return obj.TotalCharge / area
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