hyperboloid - определение. Что такое hyperboloid
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Что (кто) такое hyperboloid - определение

TYPE OF SURFACE IN THREE DIMENSIONS
Hyperboloid of one sheet; Hyperboloid of two sheets; Hyperboloid of revolution; One-sheet hyperboloid; One-sheeted hyperboloid; Two-sheet hyperboloid; Two-Sheeted Hyperboloid; Two-sheeted hyperboloid; Elliptic hyperboloid; Elliptical hyperboloid; Hyperboloids
  • Animation of a hyperboloid of revolution
  • 160px
  • hyperboloid of one sheet: plane sections
  • hyperboloid of two sheets: plane sections
  • hyperboloid of one sheet: generation by a rotating hyperbola (top) and line (bottom: red or blue)
  • hyperboloid of two sheets: generation by rotating a hyperbola
  • 150px
  • 150px
  • Shukhov]] hyperboloid tower (1898) in [[Vyksa]], Russia

hyperboloid         
[h??'p?:b?l??d]
¦ noun a solid or surface having plane sections that are hyperbolas, ellipses, or circles.
Derivatives
hyperboloidal adjective
Hyperboloid         
·adj Having some property that belongs to an hyperboloid or hyperbola.
II. Hyperboloid ·noun A surface of the second order, which is cut by certain planes in hyperbolas; also, the solid, bounded in part by such a surface.
Hyperboloid         
In geometry, a hyperboloid of revolution, sometimes called a circular hyperboloid, is the surface generated by rotating a hyperbola around one of its principal axes. A hyperboloid is the surface obtained from a hyperboloid of revolution by deforming it by means of directional scalings, or more generally, of an affine transformation.

Википедия

Hyperboloid

In geometry, a hyperboloid of revolution, sometimes called a circular hyperboloid, is the surface generated by rotating a hyperbola around one of its principal axes. A hyperboloid is the surface obtained from a hyperboloid of revolution by deforming it by means of directional scalings, or more generally, of an affine transformation.

A hyperboloid is a quadric surface, that is, a surface defined as the zero set of a polynomial of degree two in three variables. Among quadric surfaces, a hyperboloid is characterized by not being a cone or a cylinder, having a center of symmetry, and intersecting many planes into hyperbolas. A hyperboloid has three pairwise perpendicular axes of symmetry, and three pairwise perpendicular planes of symmetry.

Given a hyperboloid, one can choose a Cartesian coordinate system such that the hyperboloid is defined by one of the following equations:

x 2 a 2 + y 2 b 2 z 2 c 2 = 1 , {\displaystyle {x^{2} \over a^{2}}+{y^{2} \over b^{2}}-{z^{2} \over c^{2}}=1,}

or

x 2 a 2 + y 2 b 2 z 2 c 2 = 1. {\displaystyle {x^{2} \over a^{2}}+{y^{2} \over b^{2}}-{z^{2} \over c^{2}}=-1.}

The coordinate axes are axes of symmetry of the hyperboloid and the origin is the center of symmetry of the hyperboloid. In any case, the hyperboloid is asymptotic to the cone of the equations:

x 2 a 2 + y 2 b 2 z 2 c 2 = 0. {\displaystyle {x^{2} \over a^{2}}+{y^{2} \over b^{2}}-{z^{2} \over c^{2}}=0.}

One has a hyperboloid of revolution if and only if a 2 = b 2 . {\displaystyle a^{2}=b^{2}.} Otherwise, the axes are uniquely defined (up to the exchange of the x-axis and the y-axis).

There are two kinds of hyperboloids. In the first case (+1 in the right-hand side of the equation): a one-sheet hyperboloid, also called a hyperbolic hyperboloid. It is a connected surface, which has a negative Gaussian curvature at every point. This implies near every point the intersection of the hyperboloid and its tangent plane at the point consists of two branches of curve that have distinct tangents at the point. In the case of the one-sheet hyperboloid, these branches of curves are lines and thus the one-sheet hyperboloid is a doubly ruled surface.

In the second case (−1 in the right-hand side of the equation): a two-sheet hyperboloid, also called an elliptic hyperboloid. The surface has two connected components and a positive Gaussian curvature at every point. The surface is convex in the sense that the tangent plane at every point intersects the surface only in this point.