Oscar, This is the main tutorial: https://github.com/pydy/pydy-tutorial-human-standing
Jason moorepants.info +01 530-601-9791 On Tue, May 14, 2019 at 3:00 PM Oscar Benjamin <[email protected]> wrote: > Thanks Jason. Those links helped. > > I guess if the module is not intended for simpler problems then that > makes sense. I would say though that the documentation could benefit > from more of a tutorial somewhere. > > I'll try to use it for a real problem at some point and then see what I > think... > > -- > Oscar > > On Tue, 14 May 2019 at 18:32, Jason Moore <[email protected]> wrote: > > > > Oscar, > > > > Also a specific answer to: > > > > > Suppose that I want to think about a simple 2D problem with a disc > > rolling down a surface inclined at angle beta with (Coulomb) friction > > coefficient mu. I want to know when/whether the disc will stick or > > slip and get the equations of motion for each case. How would I go > > about doing that using the mechanics module? > > > > This is way too simple of a problem to really use the mechanics module > for. If I were teaching this I would just use the base sympy features to do > the math. The mechanics module is not really geared towards things you find > in introductory mechanics in physics and dynamics courses. It is geared > toward dynamics of multibodies, 2D and 3D. Most schools teach this at the > graduate level or some advanced upper level courses in engineering and > physics. > > > > I have another package called "resonance" that is aligned more for 2D > dynamics and simulation. I do teach the students to derive equations of > motion symbolically with sympy and use the resonance interface to do the > simulation and analysis. This is here: > https://github.com/moorepants/resonance/ > > > > Jason > > moorepants.info > > +01 530-601-9791 > > > > > > On Tue, May 14, 2019 at 8:59 AM Jason Moore <[email protected]> > wrote: > >> > >> Oscar, > >> > >> There are some rolling disc examples here: > https://github.com/pydy/pydy/tree/master/examples Note that the PyDy > project started as an independent thing build on top of SymPy, then the > symbolics were merged into sympy as the mechanic module and the numerics > are now in the standalone PyDy package. > >> > >> Also, I teach an entire graduate class using the module that include > 20+ lecture videos and accompanying notebooks: > https://moorepants.github.io/mae223/ > >> > >> There are also several scipy/pycon tutorials on the package: > >> > >> http://www.moorepants.info/portfolio/pydy.html > >> > >> The module may be complicated, but that may just reflect that 3D > multibody rigid body mechanics is complicated. We've worked on some layers > on top of the core code that have been merged or are in open PRs to help > provide simpler interfaces that give a way to "assemble" bodies as you > would in reality (with joints, etc) but it is still not polished for > production. I could imagine a layer that makes it simpler to do 2D > mechanics too, among other things. > >> > >> I'll be working on things this summer because I am teaching the > aforementioned course in the fall. Feel free to open issues for discussion > on improvements. > >> > >> Jason > >> moorepants.info > >> +01 530-601-9791 > >> > >> > >> On Mon, May 13, 2019 at 1:42 PM Oscar Benjamin < > [email protected]> wrote: > >>> > >>> Hi all, > >>> > >>> I haven't really looked much at SymPy's mechanics module even though > >>> mechanics is very much one of my interests and something that I like > >>> to think I know a bit about. Today I finally took a look at it and I > >>> found the whole API surprisingly complicated. I teach mechanics to > >>> undergraduate students but I'm not sure if I would know how to teach > >>> my students to use the mechanics module as it is now... > >>> > >>> Firstly I looked through the documentation here: > >>> https://docs.sympy.org/latest/modules/physics/mechanics/index.html > >>> Is there any other guide/documentation that explains the general ideas > >>> more simply with examples? > >>> > >>> Suppose that I want to think about a simple 2D problem with a disc > >>> rolling down a surface inclined at angle beta with (Coulomb) friction > >>> coefficient mu. I want to know when/whether the disc will stick or > >>> slip and get the equations of motion for each case. How would I go > >>> about doing that using the mechanics module? > >>> > >>> -- > >>> Oscar > >>> > >>> -- > >>> You received this message because you are subscribed to the Google > Groups "sympy" group. > >>> To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected]. > >>> To post to this group, send email to [email protected]. > >>> Visit this group at https://groups.google.com/group/sympy. > >>> To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/CAHVvXxQXtAd_HGwTqaKrpDqQC_mNcyZAFgPrVe8Sq_hPwT6H0w%40mail.gmail.com > . > >>> For more options, visit https://groups.google.com/d/optout. > > > > -- > > You received this message because you are subscribed to the Google > Groups "sympy" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected]. > > To post to this group, send email to [email protected]. > > Visit this group at https://groups.google.com/group/sympy. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/CAP7f1AgY%3Dcq3q9DCAYk_0-4qV8rhoVZTTJp7WJku8A%2BX2%3Df_Mg%40mail.gmail.com > . > > For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/CAHVvXxRNKSrrgeMxJjh5M6BtQEU%2BQNaOzyAEXAokJYZESxy9ig%40mail.gmail.com > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "sympy" group. 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