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]>
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
+01 530-601-9791
On Thu, Mar 13, 2014 at 12:31 PM, Sachin Joglekar
<[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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