A novel D4Bar suspension for a WMR to traverse an uneven terrain with low slip is presented in this paper. Numerical simulations,
done using ADAMS/View, show that the mobile robot will exhibit less slip when the D4Bar suspension is used while it slips much more when the suspensions is not used on uneven terrains. Experimentation was done for three motions, namely a straight line motion,
a circular motion and a lane change motion. The path of the platform center in the representative paths are projected on surface.
The plot of error as function of path is presented for all the cases. Experiments clearly show that the deviation from desired trajectories
and path deviation error are much less when the D4Bar suspension is used and the torus shaped wheels are allowed to tilt laterally.
Based on simulation and experimentation, which ensures both reductions in slip and less path deviation, we can conclude the D4Bar
suspension will lead to less slip on uneven terrains. Future work will focus on the development of a more refined three-wheeled mobile
robot and more extensive experimentation to validate the slip free capability of a wheeled mobile robot, traversing an uneven
terrain, when the wheels are allowed to tilt laterally.