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About this paper
Annika Kirner, Christian Ott
Researchers from TU Wien and DLR systematically analyzed the pre- and post-impact velocities of robotic systems, defining the 'nonsmooth impact direction' (NSID) as a characteristic property independent of contact elasticity. Their theoretical framework and experimental validation on passive and active robots confirm NSID governs immediate post-impact behavior and prevents slippage in frictional contacts.
Key insights
- The NSID is a unique, one-dimensional direction defining robotic impacts, independent of the contact's restitution coefficient, and dictates the direction of the velocity jump during impact.
- Approaching along the NSID ensures pre- and post-impact velocity directions align (scaled by the negative restitution coefficient) and, for inelastic contacts, generates an impulsive force normal to the surface, preventing slippage.
- The NSID's properties are deeply connected to the robot's kinematic and inertial characteristics, with specific conditions linking it to the inertia ellipsoid and principal axes.
Summary by alphaXiv.
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