Centroid(形心)
1 x) Z q) G) oIn 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.
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& s: E; [4 c0 t3 M6 ~The 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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The centroid of a finite set of points can be computed as the arithmetic mean of each coordinate of the points.
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$ m/ q; x$ F) [5 I4 @# eIn geography, the centroid of a region of the Earth's surface is often known as its geographic center.1 y/ u0 E* _7 p, h8 @% C
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Neutral axis(中性轴)* B8 w6 A' [4 g7 t
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.( z! a$ |7 W" u2 C* Z! b
这个也许能有些帮助。 |