On 03/13/2014 01:56 PM, Sachin Joglekar wrote:
I agree. Hence, the classes I plan to build on top of Prasoon's core
will have time-dependent functionality to support motion.
On Thu, Mar 13, 2014 at 11:23 PM, Tim Lahey <[email protected]
<mailto:[email protected]>> wrote:
I think it's necessary to have a reference frame that changes with
respect to time. Even something such as simple link can have a
frame that rotates with respect to the inertial frame. A rotating
frame makes dealing with the equations for a flexible link
simpler. Plus, it's useful for multi-body systems as well.
Cheers,
Tim.
On 13 Mar 2014, at 13:29, Sachin Joglekar wrote:
Okay my words may have been a little confusing. To explain the
terms better-
*rotated* - oriented at a certain angle wrt the parent system
*translated* - the origin of the translated system has a
non-zero position
vector wrt the parent system
To put it more clearly, the orientation of the child system
and the its
origin's position vector are _not_ functions of time. Essentially,
Prasoon's code does not deal with time at all. Its good to do
simple vector
calculus that does not involve time as a factor.
By motion, I meant a system whose orientation/translation wrt
its parent
change with time.
On Thu, Mar 13, 2014 at 10:50 PM, Jason Moore
<[email protected] <mailto:[email protected]>> wrote:
"A coordinate system is a mathematical concept that helps
one describe
points or vectors(directions) in space. A reference frame,
on the other
hand, is the extension of this concept to involve motion
(time-dependent
quantities). Coordinate Systems may be rotated/translated
with respect to
each other, *but* they are stationary."
I don't understand this. How can a coordinate system be
rotated and
translated yet be stationary. What is your definition of
"motion"?
Jason
moorepants.info <http://moorepants.info>
+01 530-601-9791
On Thu, Mar 13, 2014 at 12:31 PM, Sachin Joglekar
<[email protected] <mailto:[email protected]>
wrote:
Hello everyone.
I have put up my proposal for the SymPy/PyDy project
on creating a
general-purpose vector calculus module for sympy. It
will be a continuation
of the work that was done by Prasoon and I last
summer, and hopefully I
plan to conclude it this time (much of it is currently
unmerged). The
details of the project are in my proposal at this
link<https://github.com/pydy/pydy/wiki/GSoC-2014-Application:-srjoglekar246:-sympy.vector-module>
.
@Ondrej, Aaron, Stefan - please give your inputs for
the same.
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For classical mechanics using spinors for rotating frames see "New
Foundations for Classical Mechanics" by David Hestenes
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