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herpolhode
A herpolhode is the curve traced out by the endpoint of the angular velocity vector ω of a rigid rotor, a rotating rigid body. The endpoint of the angular velocity moves in a plane in absolute space, called the invariable plane, that is orthogonal to the angular momentum vector L. The fact that the herpolhode is a curve in the invariable plane appears as part of Poinsot's construction.
The trajectory of the angular velocity around the angular momentum in the invariable plane is a circle in the case of a symmetric top, but it the general case wiggles inside an annulus, while still being concave towards the angular momentum.
==References==
H. Goldstein, ''Classical Mechanics'', Addison-Wesley (1950), p. 159 ff.
V. I. Arnold, ''Mathematical Methods of Classical Mechanics'', Second edition, Springer (1989), p. 146.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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