Phase space trace of (under-)damped oscillator; third dimension is time.

A – amplitude; k – spring constant; m – mass, b – damping constant; d – damping parameter; a – angular frequency; W – natural frequency; f – position; g – velocity

F0 – magnitude of driving force; f – angular frequency of driving force; X – amplitude of driven oscillation; P – phase of driven oscillation

Poincare Section:

Author: David A. Craig <http://web.lemoyne.edu/~craigda/>

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