Spherical Cycloid

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This Demonstration simulates the generation of a spherical cycloid by a point on the edge of a circle rolling without sliding along the edge of another circle (the base circle) on the same sphere (the base sphere).
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Contributed by: Erik Mahieu (October 2016)
Open content licensed under CC BY-NC-SA
Snapshots
Details
Let be the radius of the base circle centered at
, let
be the radius of the rolling circle, and let
be the angle between the
-
plane and the plane of the rolling circle.
Let be the angular displacement of the rolling circle along the edge of the base circle. Since the rolling circle rolls without sliding, its angular displacement around its center is
.
is a point on a copy of the rolling circle centered at
in the
-
plane. First rotate this circle by
around the
axis to obtain:
.
Now translate the circle over a distance along the
axis to get:
.
Finally, rotate this circle by an angle around the
axis:
to obtain the parametric equations of the spherical cycloid:
,
,
.
Reference
[1] H. M. Jeffery, "On Spherical Cycloidal and Trochoidal Curves," The Quarterly Journal of Pure and Applied Mathematics, 19(73), 1882 pp. 45–66. gdz.sub.uni-goettingen.de/dms/load/img/?PID=PPN600494829_0019%7CLOG_0012.
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