The Holditch sickles for the open homothetic motions.
The paper deals with asymptotic motions of 3-parametric robot manipulators with parallel rotational axes. To describe them we use the theory of Lie groups and Lie algebras. An example of such motions are motions with the zero Coriolis accelerations. We will show that there are asymptotic motions with nonzero Coriolis accelerations. We introduce the notions of the Klein subspace, the Coriolis subspace and show their relation to asymptotic motions of robot manipulators. The asymptotic motions are...
The paper deals with the local differential geometry of two-parametric motions in the Euclidean space. The first part of the paper contains contemporary formulation of classical results in this area together with the connection to the elliptical differential geometry. The remaining part contains applications. Necessary and sufficient conditions for splitting of a two-parametric motion into a product of two one-parametric motions, characterization of motions with constant invariants and some others....
Im vorliegenden Artikel werden die Integral- und Differentialinvarianten der Möbiusschen Gruppe (-Gruppe) hergeleitet. Weiter wird die Berührung einer in der Möbiusebene (-Ebene) gegebenen Kurve mit Kurven mit konstanter -Krümmung untersucht und es werden die -Analoge der Mittelpunkte der Krümmung, der Evolute und des Schmiegobjektes gefunden. Diese Problematik wird auch vom kinematischen Standpunkt interpretiert.