Doubochinski's pendulum

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Fig.1. Schematics of the Doubochinski’s pendulum
Fig.2. First four quantized amplitudes of Doubochinski’s pendulum at a magnetic field frequency f=50Hz. Electromagnet is located at the bottom of the pendulum.

Doubochinski's pendulum is an experiment with an oscillator and a magnet. The most simple case is that of a pendulum that interacts with an oscillator. The pendulum (with a magnet at the end) will swing at a frequency of one swing per period of 1-2 seconds. A stationary electromagnet is placed under the equilibrium point of the pendulum. The electromagnet is then supplied with an alternating current of a fixed frequency, of between 10 and 10.000 Hz. When the pendulum is released at any location, its movement will then evolve to stop at a height which depends on the frequency of the current of the electromagnet. This phenomenon was first discovered by the brothers Danil and Yakov Doubochinski in 1968–69.[1]

References[change | change source]

  1. Tennenbaum, Jonathan 2005. Amplitude quantization as an elementary property of macroscopic vibrating systems. 21st Century Science & Technology. [1]