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Old 01-14-2011, 04:26 AM
Nametag Nametag is offline
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Join Date: Apr 2002
Location: California
Posts: 8,099
It's damping, not rotation; according to Innovative Balancing, the manufacturers of DynaBeads, the distribution due to rotation is uniform. Their argument is that as a tire is being driven on a road, the "heavy spot" causes asymmetric travel upward when it's at the top -- sort of a "jump"; since the beads are not fixed to the tire, their inertia (translational, not rotational) causes depopulation of the heavy region, and overpopulation of the opposite region. I assume that during the "heavy spot down" part of the cycle, they'd argue that contact with the ground prevents the same degree of travel, preventing the "making things worse" scenario. This effect will continue until the beads are distributed so as to cancel all vibration.

Or so they say.