Rotation-minimizing osculating frames

  • Authors:
  • Rida T. Farouki;Carlotta Giannelli;Maria Lucia Sampoli;Alessandra Sestini

  • Affiliations:
  • Department of Mechanical and Aerospace Engineering, University of California, Davis, CA 95616, USA;Institut für Angewandte Geometrie, Johannes Kepler Universität Linz, Altenberger Strasse 69, A-4040 Linz, Austria;Dipartimento di Ingegneria dellInformazione e Scienze Matematiche, Universití di Siena, Pian dei Mantellini 44, 53100 Siena, Italy;Dipartimento di Matematica e Informatica, Universití degli Studi di Firenze, Viale Morgagni 67a, 50134 Firenze, Italy

  • Venue:
  • Computer Aided Geometric Design
  • Year:
  • 2014

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Abstract

An orthonormal frame (f"1,f"2,f"3) is rotation-minimizing with respect to f"i if its angular velocity @w satisfies @w@?f"i=0 - or, equivalently, the derivatives of f"j and f"k are both parallel to f"i. The Frenet frame (t,p,b) along a space curve is rotation-minimizing with respect to the principal normal p, and in recent years adapted frames that are rotation-minimizing with respect to the tangent t have attracted much interest. This study is concerned with rotation-minimizing osculating frames (f,g,b) incorporating the binormal b, and osculating-plane vectors f, g that have no rotation about b. These frame vectors may be defined through a rotation of t, p by an angle equal to minus the integral of curvature with respect to arc length. In aeronautical terms, the rotation-minimizing osculating frame (RMOF) specifies yaw-free rigid-body motion along a curved path. For polynomial space curves possessing rational Frenet frames, the existence of rational RMOFs is investigated, and it is found that they must be of degree 7 at least. The RMOF is also employed to construct a novel type of ruled surface, with the property that its tangent planes coincide with the osculating planes of a given space curve, and its rulings exhibit the least possible rate of rotation consistent with this constraint.