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Date: 3-7-2018
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Date: 11-6-2018
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Date: 30-5-2018
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Overdamped simple harmonic motion is a special case of damped simple harmonic motion
(1) |
in which
(2) |
Therefore
(3) |
(4) |
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(5) |
where
(6) |
The general solution is therefore
(7) |
where and are constants. The initial values are
(8) |
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(9) |
so
(10) |
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(11) |
The above plot shows an overdamped simple harmonic oscillator with , and three different initial conditions .
For a cosinusoidally forced overdamped oscillator with forcing function , i.e.,
(12) |
the general solutions are
(13) |
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(14) |
where
(15) |
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(16) |
These give the identities
(17) |
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(18) |
and
(19) |
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(20) |
We can now use variation of parameters to obtain the particular solution as
(21) |
where
(22) |
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(23) |
and the Wronskian is
(24) |
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(25) |
These can be integrated directly to give
(26) |
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(27) |
Integrating, plugging in, and simplifying then gives
(28) |
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(29) |
where use has been made of the harmonic addition theorem and
(30) |
REFERENCES:
Papoulis, A. Probability, Random Variables, and Stochastic Processes, 2nd ed. New York: McGraw-Hill, pp. 527-528, 1984.
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