Double Square Pendulum - dynamics 3

This page describes work done by Mohammad Rafat, Mike Wheatland, and Tim Bedding. A paper on the work has been published in the American Journal of Physics (Rafat, Wheatland and Bedding 2009). A preprint is available here.

High energy

At high energy the motion starts to becomes regular again, as explained previously. The animation and section below show the case E = 150. Regular motion (a set of curves) has reappeared in the Poincare section.

[Animation for E=150] [Poincare section for E=150]

At very high energies the motion is completely regular, as gravity becomes unimportant. The animation and section below show the case E = 20000. The Poincare section consists entirely of regular motion. Note that the section has approximate reflection symmetry about a vertical line at 45 degrees: the line joining the two axes is pulled out into a radial orientation.

[Animation for E=20000] [Poincare section for E=20000]

The dynamics of the pendulum at low energy is described here. The dynamics of the pendulum at intermediate energy is described here. A large gallery of Poincare sections is provided here.

Main page on the double square pendulum
Modelling and numerical solution
Dynamics 1: Poincare sections and animations for low energy
Dynamics 2: Poincare sections and animations for intermediate energy
Images and videos of the device
Simple double pendulum page
Mike Wheatland's home page


Page maintained by m.wheatland (at) physics.usyd.edu.au Page last updated Tuesday, 5-Aug-2008