principal axis


principal axis
i. The lateral, vertical, and longitudinal axes.
ii. The axis of relative wind.
iii. The principal inertial axis: that line passing through the center of gravity in a plane of symmetry about which a long, slender body tends to rotate when rolling.
iv. A rectilinear axis in the plane of a cross section of a structural member about which the moment of inertia is the maximum.
In the illustration on the left, line A is the principal axis while in the illustration on the right, line B is the principal axis. The moment of inertia is maximum around these axes in these two cases.

Aviation dictionary. 2014.

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  • Principal axis — Principal Prin ci*pal, a. [F., from L. principalis. See {Prince}.] 1. Highest in rank, authority, character, importance, or degree; most considerable or important; chief; main; as, the principal officers of a Government; the principal men of a… …   The Collaborative International Dictionary of English

  • principal axis — Axis Ax is, n.; pl. {Axes}. [L. axis axis, axle. See {Axle}.] A straight line, real or imaginary, passing through a body, on which it revolves, or may be supposed to revolve; a line passing through a body or system around which the parts are… …   The Collaborative International Dictionary of English

  • principal axis — pagrindinė ašis statusas T sritis automatika atitikmenys: angl. principal axis vok. Hauptachse, f rus. главная ось, f pranc. axe principal, m …   Automatikos terminų žodynas

  • principal axis — pagrindinė ašis statusas T sritis fizika atitikmenys: angl. principal axis vok. Hauptachse, f rus. главная ось, f pranc. axe principal, m …   Fizikos terminų žodynas

  • principal axis — noun a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted in a normal eye the optic axis is the direction in which objects are seen most distinctly • Syn: ↑optic axis • Hypernyms: ↑axis …   Useful english dictionary

  • principal axis — main axis, chief axis …   English contemporary dictionary

  • principal axis — prin·ci·pal axis prin(t) sə pəl n the line with respect to which a spherical mirror or lens system is symmetrical and which passes through both the center of the surfaces and their centers of curvature * * * optic a …   Medical dictionary

  • principal axis — 1. Optics. a line passing through the center of the surface of a lens or spherical mirror and through the centers of curvature of all segments of the lens or mirror. 2. Physics. one of three mutually perpendicular axes of a body about which the… …   Universalium

  • principal axis — /prɪnsəpəl ˈæksəs/ (say prinsuhpuhl aksuhs) noun the straight line passing through both the centre of the surface of a lens or mirror and its centre of curvature …   Australian English dictionary

  • Principal Axis Tree — L’arbre d axes principaux (en anglais : Principal Axis Tree), souvent abrégé PAT est un algorithme permettant de diviser un espace de points de manière efficiente en vue de résoudre rapidement le problème des plus proches voisins. Elle fut… …   Wikipédia en Français