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| View Original: | Kapitza pendulum.svg (580x933) | |||
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| Keywords: Kapitza pendulum.svg Diagram of a Kapitza pendulum a rigid pendulum with a vibrating suspension point used as an example of a parametric oscillator with dynamic stabilization in control system theory This device was first analyzed in 1951 by Russian Nobel laureate physicist Pyotr Kapitza It's unique feature is that the vibrating suspension can cause the pendulum to balance stably in an inverted position with the bob over the pivot In an ordinary pendulum with a fixed pivot the only stable equilibrium point is the pendulum hanging down below the pivot; the inverted position is a point of unstable equilibrium and the slightest disturbing force causes the pendulum to move away from the point The drawing shows how a Kapitza pendulum can be constructed with a motor that turns a crank at a high speed 4000-6000 RPM the crank vibrates a lever arm up and down one end is fixed and the other end supports the pendulum by a pivot If the pendulum is released with the bob near vertical the bob will oscillate back and forth about the vertical until the oscillations damp out leaving it standing upright own 211-04-09 Chetvorno I Chris Burks Chetvorno the author of this work release it into the public domain for any use whatever Cc-zero Diagrams of pendulums | ||||
