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Reply to "stiffness types"

One example of dynamic stiffness (without damping) is K - omega^2 M.  at a natural frequency (omega) there is no stiffness.   

Often we are interested in the inverse of dynamic stiffness, compliance.  In balancing on used influence coefficients (sometimes units vary, e.g. with fixed radius, but the units are basically displacement/force or in terms of velocity or acceleration - the speed squared term to give force is implicit and not explicit when we use it.  However, one must consider the speed [which is frequency, too, for balancing] when using influence coefficients or balancing.)

Together with the velocity and acceleration items, these are transfer functions, which depend upon frequency.

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