What are the features of 'freeCAD'?
'freeCAD' is capable of full 3D pan, zoom, tilt and rotate.
Available solids are extrusions of rectangles, circles, ellipses and
polygons. The solids can be positioned and oriented exactly in space,
as are markers on the solids. Exact specification of linear and
angular velocities of solids in space are also possible. Mass and
inertia properties can be user specified or automatically computed
based on uniform density. Individual parts can be save into files and
reinserted into any assembly repeatedly.
Available joints are spherical (ball),
revolute (pin), translational (slider), cylindrical, planar, fixed,
universal, point in line, point in plane, parallel, perpendicular, no
rotation, constant velocity, rack pinion, screw. Both open and closed
3D loops are permitted. The curve-curve contact allows liftoffs and
collisions based on coefficient of restitution. Available actuators
are rotational and translational. Their motions are user prescribed
functions of time.
Forces and torques are user prescribed functions
of time, displacements and velocities in all three components or
along connecting markers. Example formulas for spring, damper,
bushing, beam, aerodynamic, inverse square law and other forces and
torques are given. Available functions are sqrt, exp, ln, lg, sin,
cos, tan, arctan, arctan2, spline, spectral density. Users can
specify constant gravity of arbitrary magnitude and direction.
'freeCAD' can compute kinematic, quasi-static or dynamic solutions
for any interval of time going forward or backward based on the
assembly and user requests. It does redundant constraint removal
automatically and nondimensionalizes the equations for improved
accuracy and stability of models that are microscopic or gigantic.
Simulation progress is animated and the simulation can be stopped any
time. After simulation, the computed solution can be used for
animation or frame by frame analysis. Full 3D pan, zoom, tilt and
rotate is available during simulation and animation.
Users can obtain
engineering data in the form of plots and tabular output. XY plots
can be zoomed and set to equal scales. Data series available include
linear and angular displacements, velocities, accelerations, forces,
torques, momenta and kinetic energies. Acceleration data include
transverse, centripetal and Coriollis accelerations. Users can view
forces and torques from joints, constraints, actuators, springs,
dampers, applied forces and inertia. Fourier tranforms of all times
series are available.
Assemblies can be saved in
binary or human readable, tab delimited, text format with notes and
simulation data for later reload. The text format allows pre and post
processing of assemblies by other programs, especially spreadsheet
programs. Other specific text formats are for MOSES, PDMS
Review and .
'freeCAD' runs on Windows, Linux PC, Macintosh PPC and other Unix's.
Assembly data are unchanged across platforms.
Copyright (C) 2000-2006, Aik-Siong Koh, All Rights Reserved.