2 research outputs found
Regrasp Planning Considering Bipedal Stability Constraints
This paper presents a Center of Mass (CoM) based manipulation and regrasp
planner that implements stability constraints to preserve the robot balance.
The planner provides a graph of IK-feasible, collision-free and stable motion
sequences, constructed using an energy based motion planning algorithm. It
assures that the assembly motions are stable and prevent the robot from falling
while performing dexterous tasks in different situations. Furthermore, the
constraints are also used to perform an RRT-inspired task-related stability
estimation in several simulations. The estimation can be used to select between
single-arm and dual-arm regrasping configurations to achieve more stability and
robustness for a given manipulation task. To validate the planner and the
task-related stability estimations, several tests are performed in simulations
and real-world experiments involving the HRP5P humanoid robot, the 5th
generation of the HRP robot family. The experiment results suggest that the
planner and the task-related stability estimation provide robust behavior for
the humanoid robot while performing regrasp tasks
Arm Manipulation Planning of Tethered Tools with the Help of a Tool Balancer
Robotic manipulation of tethered tools is widely seen in robotic work cells.
They may cause excess strain on the tool's cable or undesired entanglements
with the robot's arms. This paper presents a manipulation planner with cable
orientation constraints for tethered tools suspended by tool balancers. The
planner uses orientation constraints to limit the bending of the balancer's
cable while the robot manipulates a tool and places it in a desired pose. The
constraints reduce entanglements and decrease the torque induced by the cable
on the robot joints. Simulation and real-world experiments show that the
constrained planner can successfully plan robot motions for the manipulation of
suspended tethered tools preventing the robot from damaging the cable or
getting its arms entangled, potentially avoiding accidents. The planner is
expected to play promising roles in manufacturing cells