Rayleigh's dissipation function

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Rayleigh's dissipation function [′rā·lē ‚dis·ə′pā·shən ‚fəŋk·shən]

(mechanics)

A function which enters into the equations of motion of a system undergoing small oscillations and represents frictional forces which are proportional to velocities; given by a positive definite quadratic form in the time derivatives of the coordinates. Also known as dissipation function.

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