Abstract
PLEXUS-R (R for robotics) is an explicit computing program. Its variables are updated according to the time. This time (pseudo-continu) is updated in order to represent correctly the physical phenomenon. The calculation is done at every time step and the variable evolution is blocked between two successive time steps. After a brief recall of the PLEXUS-R finite elements software, this paper describe the implicit and explicit integrating methods and the problems of the classical finite elements time steps and the robotic finite elements time steps. In other respects, control elements require specific solvers and synchronisation between these solvers and the finite elements explicit integrating method of PLEXUS-Re These developments are illustrated by the use of PLEXUS-R as computer aided design of the control of the primary mirror of the "Very Large Telescope" project.
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