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Parametric excited pendula: which differences?

Parametric excited pendula: which differences? https://ift.tt/8VvmEoZ Parametric excited pendula: which differences? A parametrically excited pendulum can experience circular motions. Real world examples are: (i) the "click-clack ball" toy, and (ii) the "flying cage" of the amusement parks (or, simply, the child swing, executing a revolution motion).  Do these systems behave in equivalent way? Not at all!

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