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Mobility of bodies in contact. II. How forces are generated by curvature effects

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2 Author(s)
Rimon, E. ; Dept. of Mech. Eng., Technion-Israel Inst. of Technol., Haifa, Israel ; Burdick, J.W.

For part I, see ibid., p.696-708. The paper considers how forces are produced by compliance and surface curvature effects in systems where an object a is kinematically immobilized to second-order by finger bodies Al,...,Ak. A class of configuration-space based elastic deformation models is introduced. Using these elastic deformation models, it is shown that any object which is kinematically immobilized to first or second-order is also dynamically locally asymptotically stable with respect to perturbations. Moreover, it is shown that for preloaded grasps kinematic immobility implies that the stiffness matrix of the grasp is positive definite. The stability result provides physical justification for using second-order effects for purposes of immobilization in practical applications. Simulations illustrate the concepts

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Robotics and Automation, IEEE Transactions on  (Volume:14 ,  Issue: 5 )