Dual action double pendulum

Details Dual action double pendulum Dual action double pendulum

1997-08-29

1999-04-20

Hafer, Robert A.

Education and demonstration

Science

Physics

185 29, G09B 2310, F03G 306

Patent

active

058952217

ABSTRACT:
A double pendulum device displaying regular and chaotic behavior simultaneously when the pendulums are in motion, comprising: a beam (55) mounted symmetrically to a vertical surface about a pivot point consisting of a friction reducing insert (56) with a fastener (57) passing through it for attachment of the beam to said vertical surface and allowing free rotation of the beam (55) about its horizontal axis; a long pendulum (44) attached near one end of the beam (55) with a fastener (46) passing through a friction reducing insert (45) installed in and near one end of the long pendulum and a spacer (47), said long pendulum (44) being free to rotate about a horizontal axis; an arm (66) fixed at the opposite end of beam (55) from long pendulum (44) in such a manner as to become a ninety degree extension of beam (55) directionally equal to the long pendulum (44) when the pendulum device is static; a short pendulum (77) attached near the opposite end of the arm (66) from said arm's attachment to the beam (55) with a fastener (79) passing through a friction reducing insert (78) installed in and near the end of the short pendulum (77) and a spacer (80) that places the short pendulum (77) in the same vertical plane as the long pendulum (44), said short pendulum (77) being free to rotate around a horizontal axis; and the long pendulum (44), beam (55), arm (66), and short pendulum (77) each having sufficient mass to provide inertial power for a plurality of swings of the pendulum device after a starting force is applied, said pendulum device always having its beam (55) parallel to the ground when static.

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American Journal of Physics, 1 Variable Mass Physical Pendulum--J.E. Kettler V63 pp. 1049-1051 Nov. '95, 2 Double Pendulum: An Experiment in Chaos--Levin and Tan V61 pp. 1038-1044 Nov. '93, 3 Chaotic Pendulum, Based on Torsion and Gravity in Opposition-Peters V63 pp. 1128-1136 Dec. '95.

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