|Intelligent Robotic Gripper with Adaptive Grasping Force
Shiuh-Jer Huang*, Wei-Han Chang, and Jui-Yiao Su
International Journal of Control, Automation, and Systems, vol. 15, no. 5, pp.2272-2282, 2017
Abstract : "The on-off control robot gripper is widely employed in pick-and-place operations in Cartesian space for
handling hard objects between two positions. Without contact force monitoring, it can not be applied in fragile or
soft objects handling. Although, an appropriate grasping force or gripper opening for each target could be searched
by trial-and-error process, it needs expensive force/torque sensor or an accurate gripper position controller. It has
too expensive and complex control strategy disadvantages for most of industrial applications. In addition, it can
not overcome the target slip problem due to mass uncertainty and dynamic factor. Here, an intelligent gripper is
designed with embedded distributed control structure for overcoming the uncertainty of object’s mass and soft/hard
features. A communication signal is specified to integrate both robot arm and gripper control kernels for executing
the robotic position control and gripper force control functions in sequence. An efficient model-free intelligent
fuzzy sliding mode control strategy is employed to design the position and force controllers of gripper, respectively.
Experimental results of pick-and-place soft and hard objects with grasping force auto-tuning and anti-slip control
strategy are shown by pictures to verify the dynamic performance of this distributed control system. The position
and force tracking errors are less than 1 mm and 0.1 N, respectively."
Anti-slip scheme, force control, fuzzy sliding mode control, intelligent gripper.
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