Centroid(形心)$ K5 W' L/ @8 t, \7 \8 K$ ?' T5 S+ \
In geometry, the centroid or barycenter of an object X in n-dimensional space is the intersection of all hyperplanes that divide X into two parts of equal moment about the hyperplane. Informally, it is the "average" of all points of X.- Y% M0 ?! c. _, ]5 r
* a- L# X, N0 E5 L! f9 dThe geometric centroid of a physical object coincides with its center of mass if the object has uniform density, or if the object's shape and density have a symmetry which fully determines the centroid. These conditions are sufficient but not necessary.
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* o7 A, h |7 r1 C: V: sThe centroid of a finite set of points can be computed as the arithmetic mean of each coordinate of the points.0 k* e* @6 L) M9 V. O& M% q
( c+ l7 a6 f) aIn geography, the centroid of a region of the Earth's surface is often known as its geographic center.
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?" Y' P" t0 q: b% _" W& N' \3 y2 l9 SNeutral axis(中性轴)3 \8 M* J' R, D" g j9 n2 u
An axis in the cross section of a beam, shaft or the like along which there are no longitudinal stresses / strains. If the section is symmetric (in both geometry and materials) the neutral axis is at the geometric centroid.
3 m* A# w) M$ q, G这个也许能有些帮助。 |