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deformabledisplacement.py
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deformabledisplacement.py
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# -*- coding: utf-8 -*-
###################################################################################
#
# Copyright 2021 Jose Gabriel Egas Ortuno
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
#
###################################################################################
'''
This scripted object represents a deformable displacement joint
The syntax is:
joint: <label>,
deformable displacement joint,
<node1>, # a (static) node to which the joint is fixed
null, # relative offset
<node2>, # a dynamic node which will oscilate
null, # relative offset
linear viscoelastic isotropic,
<stiffness>, # spring stiffness
<viscosity>, # viscosity coefficient
prestrain, single, <direction>, const, <lenght>;
where:
label: an integer number to identify the joint, eg: 1,2,3...
node1: the label of the structural node to which the joint is fixed, eg: 1,2,3...
node2: the label of the structural node that oscilates, eg: 1,2,3...
stiffness: the spring stiffness coefficient in [N/m]
viscosity: the damper Damping Coefficient in [Ns/m]
direction: the direction in which the body will oscilate, for instance: 0., 0., -1
lenght: spring natural lenght in [m]
'''
#from FreeCAD import Units
import FreeCAD
import Draft
import FreeCADGui
class DeformableDisplacement:
def __init__(self, obj, label, node1, node2):
x = node1.position_X
y = node1.position_Y
z = node1.position_Z
x1 = node2.position_X
y1 = node2.position_Y
z1 = node2.position_Z
#Initial spring stiffness:
k = FreeCAD.Units.Quantity(1.0,FreeCAD.Units.Unit('N/m'))
#Initial damping coeficient (viscosity):
u = FreeCAD.Units.Quantity(0.003,FreeCAD.Units.Unit('N*s/m'))
#Initial oscilation directon:
d = '0., 0., -1'
#Initial lenght is the distance between the two nodes
aux = pow(pow((node2.position_X - node1.position_X),2) + pow((node2.position_Y - node1.position_Y),2) + pow((node2.position_Z - node1.position_Z),2),(0.5))
lenght = FreeCAD.Units.Quantity(aux,FreeCAD.Units.Unit('m'))
obj.addExtension("App::GroupExtensionPython", self)
obj.addProperty("App::PropertyString","joint","Deformable displacement joint","joint",1).joint = "deformable displacement joint"
obj.addProperty("App::PropertyString","label","Deformable displacement joint","label").label = str(label)
obj.addProperty("App::PropertyString","node_1","Deformable displacement joint","node_1").node_1 = str(node1.label)
obj.addProperty("App::PropertyString","node_2","Deformable displacement joint","node_2").node_2 = str(node2.label)
obj.addProperty("App::PropertyString","stiffness","Deformable displacement joint","stiffness").stiffness = str(k)
obj.addProperty("App::PropertyString","viscosity","Deformable displacement joint","viscosity").viscosity = str(u)
obj.addProperty("App::PropertyString","direction","Deformable displacement joint","direction").direction = d
obj.addProperty("App::PropertyDistance","lenght","Deformable displacement joint","lenght").lenght = lenght
obj.addProperty("App::PropertyDistance","position X","Initial absolute position","position X",1).position_X = x
obj.addProperty("App::PropertyDistance","position Y","Initial absolute position","position Y",1).position_Y = y
obj.addProperty("App::PropertyDistance","position Z","Initial absolute position","position Z",1).position_Z = z
obj.addProperty("App::PropertyString","force vector multiplier","Animation","force vector multiplier").force_vector_multiplier = '1'
obj.addProperty("App::PropertyString","frame","Animation","frame").frame = 'local'
obj.addProperty("App::PropertyString","animate","Animation","animate").animate = 'false'
obj.Proxy = self
length = FreeCAD.ActiveDocument.getObjectsByLabel("x: structural: " + node1.label)[0].Length.Value # Calculate the body characteristic length. Will be used to size the arrows that represent the node.
p1 = FreeCAD.Vector(0, 0, 0)
#Add x vector of the coordinate system:
p2 = FreeCAD.Vector(length, 0, 0)
l = Draft.makeLine(p1, p2)
l.Label = 'x: joint: '+ str(label)
l.ViewObject.LineColor = (1.00,0.00,0.00)
l.ViewObject.PointColor = (1.00,0.00,0.00)
l.Placement=FreeCAD.Placement(FreeCAD.Vector(x,y,z), FreeCAD.Rotation(FreeCAD.Vector(0,0,1),0), FreeCAD.Vector(0,0,0))
l.ViewObject.EndArrow = True
l.ViewObject.ArrowType = u"Arrow"
l.ViewObject.LineWidth = 1.00
l.ViewObject.PointSize = 1.00
#l.ViewObject.ArrowSize = str(length/15)+' mm'
l.ViewObject.Selectable = False
#Add y vector of the coordinate system:
p2 = FreeCAD.Vector(0, length, 0)
l = Draft.makeLine(p1, p2)
l.Label = 'y: joint: '+ str(label)
l.ViewObject.LineColor = (0.00,1.00,0.00)
l.ViewObject.PointColor = (0.00,1.00,0.00)
l.Placement=FreeCAD.Placement(FreeCAD.Vector(x,y,z), FreeCAD.Rotation(FreeCAD.Vector(0,0,1),0), FreeCAD.Vector(0,0,0))
l.ViewObject.EndArrow = True
l.ViewObject.ArrowType = u"Arrow"
l.ViewObject.LineWidth = 1.00
l.ViewObject.PointSize = 1.00
#l.ViewObject.ArrowSize = str(length/15)+' mm'
l.ViewObject.Selectable = False
#Add z vector of the coordinate system:
p2 = FreeCAD.Vector(0, 0, length)
l = Draft.makeLine(p1, p2)
l.Label = 'z: joint: '+ str(label)
l.ViewObject.ArrowType = u"Dot"
l.ViewObject.LineColor = (0.00,0.00,1.00)
l.ViewObject.PointColor = (0.00,0.00,1.00)
l.Placement=FreeCAD.Placement(FreeCAD.Vector(x,y,z), FreeCAD.Rotation(FreeCAD.Vector(0,0,1),0), FreeCAD.Vector(0,0,0))
l.ViewObject.EndArrow = True
l.ViewObject.LineWidth = 1.00
l.ViewObject.PointSize = 1.00
#l.ViewObject.ArrowSize = str(length/15)+' mm'
l.ViewObject.Selectable = False
#Add the vector to visualize reaction forces
Llength = FreeCAD.Units.Quantity(FreeCAD.ActiveDocument.getObjectsByLabel("X")[0].End[0]/4,FreeCAD.Units.Unit('mm'))
p1 = FreeCAD.Vector(x, y, z)
p2 = FreeCAD.Vector(x+Llength, y+Llength, z+Llength)
d = Draft.makeLine(p1, p2)
d.ViewObject.LineColor = (1.00,0.00,0.00)
d.ViewObject.PointColor = (1.00,0.00,0.00)
d.ViewObject.LineWidth = 1.00
d.ViewObject.PointSize = 1.00
d.ViewObject.EndArrow = True
d.ViewObject.ArrowType = u"Arrow"
#d.ViewObject.ArrowSize = str(length/15)#+' mm'
d.ViewObject.Selectable = False
d.Label = "jf: "+ str(label)
#add the spring
h = FreeCAD.ActiveDocument.addObject("Part::Helix","sp: "+ str(label))
h.Label = "sp: "+ str(label)
h.Pitch=2.00
h.Height= pow (( pow((x1 - x),2) + pow((y1 - y),2) + pow((z1 - z),2) ), 1/2)
h.Radius=Llength.Value/10
h.Angle=0.00
h.Placement = FreeCAD.Placement(FreeCAD.Vector(x,y,z), FreeCAD.Rotation(0,0,0), FreeCAD.Vector(0,0,0))
FreeCAD.ActiveDocument.recompute()
def onChanged(self, fp, prop):
'''Do something when a property has changed'''
try:
if (len(FreeCADGui.Selection.getSelection()) == 1):
#Get the new position and orientation
x = FreeCADGui.Selection.getSelection()[0].position_X
y = FreeCADGui.Selection.getSelection()[0].position_Y
z = FreeCADGui.Selection.getSelection()[0].position_Z
yaw = FreeCADGui.Selection.getSelection()[0].yaw
pitch = FreeCADGui.Selection.getSelection()[0].pitch
roll = FreeCADGui.Selection.getSelection()[0].roll
#Move the arrows and text
FreeCAD.ActiveDocument.getObjectsByLabel("x: joint: "+FreeCADGui.Selection.getSelection()[0].Label[-1])[0].Placement=FreeCAD.Placement(FreeCAD.Vector(x,y,z), FreeCAD.Rotation(yaw,pitch,roll), FreeCAD.Vector(0,0,0))
FreeCAD.ActiveDocument.getObjectsByLabel("y: joint: "+FreeCADGui.Selection.getSelection()[0].Label[-1])[0].Placement=FreeCAD.Placement(FreeCAD.Vector(x,y,z), FreeCAD.Rotation(yaw,pitch,roll), FreeCAD.Vector(0,0,0))
FreeCAD.ActiveDocument.getObjectsByLabel("z: joint: "+FreeCADGui.Selection.getSelection()[0].Label[-1])[0].Placement=FreeCAD.Placement(FreeCAD.Vector(x,y,z), FreeCAD.Rotation(yaw,pitch,roll), FreeCAD.Vector(0,0,0))
FreeCAD.ActiveDocument.getObjectsByLabel("i: joint: "+FreeCADGui.Selection.getSelection()[0].Label[-1])[0].Placement=FreeCAD.Placement(FreeCAD.Vector(x,y,z), FreeCAD.Rotation(yaw,pitch,roll), FreeCAD.Vector(0,0,0))
except:
return True
def execute(self, fp):
'''Do something when doing a recomputation, this method is mandatory'''
FreeCAD.Console.PrintMessage("Recompute Python Box feature\n")