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Re: [Question #402828]: Control the normal stress fluctuation in the direct shear box modeling

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From: Bruno Chareyre <question402828@xxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 07 Oct 2016 15:02:37 -0000
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Question #402828 on Yade changed:
https://answers.launchpad.net/yade/+question/402828

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
One possible strategy is to simply impose a force on the top plate and let it equilibrate (it needs to have a mass).
Is is simple but it does  not offer the best control usually, due to the inertia of the plate.

Another strategy is to impose de velocity (or displacement): v = f(sm-st), with "sm" the measured force and "st" the target force.
The remaining question is how to define f. One way is to calculate the cumulated stiffness K of all plate-particle interactions, and to use it in:

v=(sm-st)/(K*O.dt)

which will produce a nearly constant force.

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