Stability Optimization of Two-Fingered Anthropomorphic Hands for Precision Grasping with a Single Actuator

In this paper, we present a constrained optimization framework for evaluating the post-contact stability of underactuated precision grasping configurations with a single degree of actuation. Relationships between key anthropomorphic design parameters including link length ratios, transmission ratios, joint stiffness ratios and palm width are developed with applications in upper limb prosthetic design. In addition to grasp stability, we examine post-contact system work, to reduce reconfiguration, and consider the range of objects that can be stably grasped. External wrenches were simulated on a subset of the heuristically evaluated optimal solutions and an optimal configuration was experimentally tested to determine favorable wrench resistible gripper orientations for grasp planning applications.