[SciPy-User] lsoda vs. Coulomb friction

Charles R Harris charlesr.harris@gmail....
Thu Feb 4 10:37:07 CST 2010


On Thu, Feb 4, 2010 at 7:33 AM, Ryan Krauss <ryanlists@gmail.com> wrote:

> Thanks for all the excellent and thoughtful responses.  I kind of
> expected Warren to yell at me to stop using smooth solvers on
> discontinuous systems and leave it at that.  Your responses not only
> give me somethings to try, but make me feel like my question really
> was a good one.
>
> For now, I am basically following Anne's first suggestion:
>
> * Declare that when the discontinuity becomes important, the Coulomb
> friction model becomes too crude an approximation, and stop.
> (Obviously if the results agree with experiment this is unnecessary.)
>
>
That is sort of like the "switch" method in the reference I linked. That
looks like the easiest way to go for simple systems.

<snip>

Chuck
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