Robot hands are normally first in contact with the environment and should withstand hard contacts. Variable compliance systems as realized in David can handle impacts and store energy for periods of time. 2010 the first version was shown at the tradefair Automatica, follwed 2014 by the second version with ball bearings in the finger joints, shown on right picture.
In contrast to our other robot hands, David's hand has no sensors and actors in the hand. The actors and sensors are located in the forearm of the handarmsystem. This allows building a hand with the size and dexterity of a human. Every joints is actuated human like by two motors. The hand can control its position and its passive joint stiffness simulatneously with an nonlinear spring mechanism coupled to the tendons. The decoupling from the gear and output makes it very robust against hits and allows the system to run stable with low controller frequencies. The system is used to compare different tendon couplings and degree of freedoms. Furthermore dynamic grasping combined variable stiffness is explored.
The intrinsic elastic Robot David is equipped with springs in order to be flexible and robust against unknown impacts.
Similar to humans, David's hand is equipped with 20 degrees of freedom enabling it to grasp a broad variety of objects. The hand is operated via tendons with motors in the forearm.
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