Damping of Textile-Mill Movement by Frahm System

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Abstract
One of the most prevalent vibration problems in the operation of textile mills is associated with the lay movement of looms. The lay is a relatively heavy member driven with a reciprocating motion in essentially a horizontal path. Harmonic inertia forces are set up, and with the simultaneous operation of many looms large forces are transmitted to the floor and. thence to the walls of the building. Particularly where looms are mounted on upper floors of a mill building, the consequent side-to-side swaying movement is liable to exceed proportions of safety to the structure. In some cases, looms have been moved to lower floors, and in others remedial steps have been taken. Such remedies have taken the form of external abutments to reinforce the walls; the speeds of a number of looms have been changed to reduce the duration of the in-phase periods; and looms have been reoriented to distribute the forces in several different directions. Some of these measures have been helpful but not entirely corrective. The approach described in this paper is to apply to the Frahm tuned vibration damper to the restraint of mill movement.

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