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Rayleigh dissipation function : ウィキペディア英語版
Rayleigh dissipation function
In physics, the Rayleigh dissipation function, named for Lord Rayleigh, is a function used to handle the effects of velocity-proportional frictional forces in Lagrangian mechanics. It is defined for a system of N particles as
:F = \frac \sum_^N ( k_x v_^2 + k_y v_^2 + k_z v_^2 ).
The force of friction is negative the velocity gradient of the dissipation function, \bold_f = -\nabla_\bold F. The function is half the rate at which energy is being dissipated by the system through friction.
==References==

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抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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