Curvature Theory of Envelope Curve in Two Dimensional Motion and Envelope Surface in Three Dimensional Motion

Abstract

The curvature theories for envelope curve of a straight line in planar motion and envelope ruled surface of a plane in spatial motion are systematically presented in differential geometry language. Based on adjoint curve and adjoint surface methods as well as quasifixed line and quasifixed plane conditions, the centrode and axode are taken as two logical startingpoints to study kinematic and geometric properties of the envelope curve of a line in twodimensional motion and the envelope surface of a plane in threedimensional motion. The analogical Euler–Savary equation of the line and the analogous infinitesimal Burmester theories of the plane are thoroughly revealed. The contact conditions of the planeenvelope and some common surfaces, such as circular and noncircular cylindrical surface, circular conical surface, and involute helicoid are also examined, and then the positions and dimensions of different osculating ruled surfaces are given. Two numerical examples are presented to demonstrate the curvature theories.