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  1. dvisacker

    Unconstrained motion in hamiltonian mechanics

    jlinsol : Of course i agree with that wikipedia statement. Actually, the gravitational field does not even matter. Let's just assume a bar-linkage floating around in space. If we apply a force on one part of the mechanism (via let's say an external operator or some kind of engine fixed on one of...
  2. dvisacker

    Unconstrained motion in hamiltonian mechanics

    Thanks for the suggestion jlnsol. I tried making the model on SAM, but as for previous things I tried, it says my model is underdetermined which comes from the fact that in my case there is no support. Anyways, looks like a good piece of software, I will keep it for later, thanks! I attached a...
  3. dvisacker

    Unconstrained motion in hamiltonian mechanics

    The bars would be in free-fall but still with some different forces applying on different bars and different initial velocities. But yes, I the case of a uniform acceleration and no other forces applying on the system, indeed there is not much to model. Thanks for the suggestion Dougt ;)...
  4. dvisacker

    Unconstrained motion in hamiltonian mechanics

    Hello everyone, I am currently working on a bar-linkage simulation and decided to use multibody dynamics to try to perform this analysis. So basically everything seems simple and clear for examples such as double-pendulums or 4-bar linkages. And i obtain the lagrangian equations or hamiltonian...
  5. dvisacker

    Rigid-body only FEM

    Indeed, I just googled around and multi-body dynamics seem to be more adapted. Thank you for the advice !
  6. dvisacker

    Rigid-body only FEM

    Hi everyone, I am currently trying to program a MATLAB FEA code that would only take into account large rigid body deformations (no strains, no stress, I might implement this later) for bar linkages (will also head toward beams and more complicated elements later) and the trouble I have is...

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