principal axis

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principal axis

n
1. (General Physics) the line passing through the optical centre and centres of curvature of the faces of a lens or a curved mirror
2. (General Physics) any of three mutually perpendicular axes about which the moment of inertia of a body is maximum
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.principal axis - 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"
axis - a straight line through a body or figure that satisfies certain conditions
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References in periodicals archive ?
A cartesian coordinate robot is an industrial robot whose three principal axes of control are linear (i.e.
Strain ellipsoid principal axes ratio increasing, accompanied with increasing of deformation intensity.
These parameters are made translation, rotation and resolution invariant by defining the bounding box with respect to principal axes of the shape.
(13) The eigenvalues and eigenvectors of the inertia tensor provide the principal moments of inertia and principal axes of rotation, respectively.
The new empowerment package is based on three principal axes: Legislation and Policy, Services, and International Representation, all of which include resources to support the advancement of Emirati women as active partners in local, regional and global arenas.
The components [[epsilon].sub.xx], [[epsilon].sub.yy], and [[epsilon].sub.xy] of the effective permittivity tensor depend on the orientation of the principal axes of the metamaterial, i.e., on the angle [phi] between the wires and the normal to the air-MM interface.
Therefore, the problem of satellite attitude control is transformed into the number of thrusters that are required to generate independent torques with respect to the two principal axes. Sidi [10] presented a pioneering study related to this problem that numerically demonstrated that four thrusters produce independent torques with respect to three principal axes.
Since 1750 when Euler first discovered and defined principal axes of inertia (PAI), it has been used to establish a body coordinate system for different methods [15-21].
Throughout the different places and periods under review, Lekon addresses himself to four principal axes, helpfully characterised in the opening chapter.
(ii) The second and the third rotations refer to the second and the third principal axes, which are more critical and might be affected by a larger estimation error.
In the exploratory data phase, the statistical technique of PCA has been used to reduce the data dimension and find the principal axes that best represent the variation of data.

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