| 摘要 |
A series of damper dampens the vibrations in a bar extending from a quill of a bar milling machine with the damper damping each of a plurality of different natural frequencies of the extending bar depending upon the length of the extension of the bar from the quill. The damper includes a plurality of damper masses mounted on a rod with viscoelastic material between each of the adjacent damper masses and also between the supports for the rod and the adjacent damper masses. By selecting the weights of the masses and their locations on the rod, the length and diameter of the rod, and the stiffness of the viscoelastic material, the damper is designed to cover a wide frequency range, i.e., bar extension. The damper need not be tuned for each bar extension each time that the bar has a different extension since the plurality of damper masses permits the damper to dampen vibrations anywhere within the designed frequency range.
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