![]() 7 A data acquisition program is available on the University of Florida Physics Department web site 8 and does not require a LabVIEW license. ![]() 6 A 500 MHz Pentium III PC was available, as was the LabVIEW software development system used for all data acquisition and analysis. The rotary encoder and pendulum components are available from Pasco for less than $300 4 the counter/ timer board, connector block, and cable are available from National Instruments for less than $500 5 and the stepper motor system can be put together for less than $200. ![]() Not including a desktop personal computer and an assort- ment of clamps and rods, the total system cost can be kept below $1000. Our apparatus is par- ticularly well suited for an introductory treatment because it provides quality data, and its simple design means that the equations of motion can be readily derived and experimentally verified for both regular and chaotic behavior. ![]() Three commercial chaotic pendulums were reviewed in 1998 3 and components of one of those systems were used here. 1–3 A torsional pendulum 1 and a mechanical Duffing oscillator 2 have been described, but experimental Poincar ́ sections were not collected. Although the chaotic pendulum is an obvious candidate, only a few implementations have been proposed for use in teach- ing laboratories. tremendous interest in nonlinear dynamics has brought with it a need for suitable introductory experiments.
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