periodic motion

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Periodic motion

Any motion that repeats itself identically at regular intervals. If x(t) represents the displacement of any coordinate of the system at time t, a periodic motion has the property defined by the equation below for every value of

the variable time t. The fixed time interval T between repetitions, or the duration of a cycle, is known as the period of the motion.

The motion of the escapement mechanism of a watch, the motion of the Earth about the Sun, and the more complicated motion of the crankshaft, piston rods, and pistons in an engine running at uniform speed are all examples of periodic motion.

The vibration of a piano string after it is struck is a damped periodic motion, not strictly periodic according to the definition. Although the motion very nearly repeats itself, and with a fixed repetition time, each successive cycle has a slightly smaller amplitude. See Damping, Harmonic motion, Vibration, Wave motion

periodic motion

[¦pir·ē¦äd·ik ′mō·shən]
Any motion that repeats itself identically at regular intervals.
References in periodicals archive ?
Figure 6 illustrates the periodic motion observed at a flow rate of 1.
However, at the flow rates employed in this study there was no significant effect of particle size on the amplitude and the frequency of the periodic motion, at least for the sphere sizes used in this study.
The time period of the observed periodic motion decreases with flow rate but appears independent of particle size.
To control the ribbon's motion, the researchers display the attractor on a computer screen and select a point that corresponds to a particular type of periodic motion.
They can then reestablish control, bringing the ribbon back to the same periodic motion it had before, or, just as easily, putting it into a different type of regular motion.
In general, the clock was one of the fundamental metaphors of the era, with the periodic motions of the heavens constituting a celestial clockwork.

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