I am little lost in the H notation (generic linear transformation, right?), but I think the point is very clear. Is it "better" to change positions or velocity?
> if we have imposed stress along x axis : d^2 X/dt^2 = sigma/m; To me, it is just not clear how you relate stress to bulk mass (m), but I will think about it. It is true that it would be nice to do without stiffness, since computing that sucks (and PeriTriaxController does it in order to eliminate the loop over all interactions every time; so it just takes last stiffness value and updates the stress estimate based on sctrain increment. clearly it is overestimated (I didn't go in detail), and it reminds me of convergence implications of secant/tangent stiffness matrix in FEM... see attachment :-) ). v
<<attachment: PeriTriaxController_globUpdate=50.svg>>
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