Other
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001amjph..69.1096f&link_type=abstract
American Journal of Physics, Volume 69, Issue 10, pp. 1096-1102 (2001).
Other
51
Educational Aids, Mechanical Instruments And Equipment, Electrostatic Waves And Oscillations, Nonlinear Phenomena: Waves, Wave Propagation, And Other Interactions, Pluto, Celestial Mechanics, Celestial Mechanics, Neptune
Scientific paper
A weakly driven pendulum cannot be strongly excited by a fixed frequency drive. The only way to strongly excite the pendulum is to use a drive whose frequency decreases with time. Feedback is often used to control the rate at which the frequency decreases. Feedback need not be employed, however; the drive frequency can simply be swept downwards. With this method, the drive strength must exceed a threshold proportional to the sweep rate raised to the 3/4 power. This threshold has been discovered only recently, and holds for a very broad class of driven nonlinear oscillators. The threshold may explain the abundance of 3:2 resonances and dearth of 2:1 resonances observed between the orbital periods of Neptune and the Plutinos (Pluto and many of the Kuiper Belt objects), and has been extensively investigated in the Diocotron system in pure-electron plasmas.
Fajans Joel
Friedland Lazar
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