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We use computer simulations to study highly dense systems of granularparticles that are driven by oscillating forces. We implement differentdissipation mechanisms that are used to extract the injected energy. Inparticular, the action of a simple local Stokes' drag is compared withnon-linear and history-dependent frictional forces that act either betweenparticle pairs or between particles and an external container wall. The Stokes'drag leads to particle motion that is periodic with the driving force, even athigh densities around close packing where particles undergo frequentcollisions. With the introduction of inter-particle frictional forces this"interacting absorbing state" is destroyed and particles start to diffusearound. By reducing the density of the material we go through anothertransition to a "non-interacting" absorbing state, where particlesindependently follow the force-induced oscillations without collisions. In thesystem with particle-wall frictional interactions this transition has signs ofa discontinuous phase transition. It is accompanied by a diverging relaxationtime, but not by a vanishing order parameter, which rather jumps to zero at thetransition.

(Ir)reversibility in dense granular systems driven by oscillating forces