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* Copyright (c) 2013 Jan Rheinländer *
* <jrheinlaender@users.sourceforge.net> *
* *
* This file is part of the FreeCAD CAx development system. *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Library General Public *
* License as published by the Free Software Foundation; either *
* version 2 of the License, or (at your option) any later version. *
* *
* This library 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 library; see the file COPYING.LIB. If not, *
* write to the Free Software Foundation, Inc., 59 Temple Place, *
* Suite 330, Boston, MA 02111-1307, USA *
* *
***************************************************************************/
#include <Precision.hxx>
#include "FemConstraintPulley.h"
using namespace Fem;
PROPERTY_SOURCE(Fem::ConstraintPulley, Fem::ConstraintGear)
ConstraintPulley::ConstraintPulley()
{
ADD_PROPERTY(OtherDiameter, (100.0));
ADD_PROPERTY(CenterDistance, (500.0));
ADD_PROPERTY(IsDriven, (0));
ADD_PROPERTY(TensionForce, (0.0));
ADD_PROPERTY_TYPE(
BeltAngle,
(0),
"ConstraintPulley",
App::PropertyType(App::Prop_ReadOnly | App::Prop_Output),
"Angle of belt forces"
);
ADD_PROPERTY_TYPE(
BeltForce1,
(0.0),
"ConstraintPulley",
App::PropertyType(App::Prop_ReadOnly | App::Prop_Output),
"First belt force"
);
ADD_PROPERTY_TYPE(
BeltForce2,
(0.0),
"ConstraintPulley",
App::PropertyType(App::Prop_ReadOnly | App::Prop_Output),
"Second belt force"
);
ForceAngle.setValue(0.0);
Diameter.setValue(300.0);
// calculate initial values of read-only properties
onChanged(&Force);
}
App::DocumentObjectExecReturn* ConstraintPulley::execute()
{
return ConstraintGear::execute();
}
void ConstraintPulley::onChanged(const App::Property* prop)
{
ConstraintGear::onChanged(prop);
if ((prop == &Diameter) || (prop == &OtherDiameter) || (prop == &CenterDistance)) {
if (CenterDistance.getValue() > Precision::Confusion()) {
BeltAngle.setValue(
asin((Diameter.getValue() - OtherDiameter.getValue()) / 2 / CenterDistance.getValue())
);
BeltAngle.touch();
}
}
else if ((prop == &Force) || (prop == &TensionForce) || (prop == &IsDriven)) {
double radius = Diameter.getValue() / 2.0;
if (radius < Precision::Confusion()) {
return;
}
double force = Force.getValue() / (radius / 1000);
if (fabs(force) < Precision::Confusion()) {
return;
}
bool neg = (force < 0.0);
if (neg) {
force *= -1.0;
}
if (IsDriven.getValue() == neg) {
BeltForce1.setValue(force + TensionForce.getValue());
BeltForce2.setValue(TensionForce.getValue());
}
else {
BeltForce2.setValue(force + TensionForce.getValue());
BeltForce1.setValue(TensionForce.getValue());
}
BeltForce1.touch();
}
}
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