The segregation of large spheres in a granular bed under vertical vibrations is studied. In our experiments, we systematically measure rise times as a function of density, diameter, and depth, for two different sinusoidal excitations. The measurements reveal that, at low frequencies, inertia and convection are the only mechanisms behind segregation. Inertia (convection) dominates when the relat...

The rovers, which some researchers and agencies are developing, have many functions to sense a lot of information from peculiar environments like the lunar surface for localization, path planning and so on. On rough terrain, without artificial ground maintenance, like the lunar surface, the rovers avoid obstacles by using sensors, which they have. However, if the rovers traverse loose soil, lik...

Terramechanics plays an important role in determining the design and control of autonomous robots other vehicles that move on granular surfaces. Traction capabilities, slippage, sinkage a robot are governed by interaction robot’s appendage with operating terrain. It is to understand how terrain flows under this during such interaction. In work, dynamics soil performance locomotion lugged wheel ...

The EDRES software, developed by the CNES of Toulouse, is a simulation tool for planetary mobile robots. It is intended to validate control algorithms and onboard software for future exploration missions, such as ExoMars. To enhance the relevance of the simulation, we have integrated a terramechanic contact model, in order to study the influence of slippage and sinkage on motion estimation and ...

The computational fluid dynamics method is used to analyze the attitude and resistance of a side-damaged frigate DTMB-5415 during steady flooding phase. volume capture interface between water air. shear stress transport k-ω model employed include turbulence effect. dynamic overlapping grid utilized deal with mesh update due ship motion in simulation. First, resistance, floating position wave pr...