Method for actively damping vibrations on a paper-making machine

Details Method for actively damping vibrations on a paper-making machine Method for actively damping vibrations on a paper-making machine

1989-10-19

1992-03-17

Fisher, Richard V.

Paper making and fiber liberation

Processes and products

Conditioning, preparing or repairing of apparatus

162278, 248559, 248638, D21G 700

Patent

active

050965417

ABSTRACT:
The method serves for actively damping vibrations on a paper-making machine. The kinematic quantities which describes the movements of the paper-making machine or parts thereof produced by the vibrations are measured and are processed as measurement signals. Between relatively movable masses, at least one of which belongs to the vibratable structure of the paper-making machine, is provided at least one servo motor which is controlled by a control unit. Movement of this servo motor is produced in such a way that it is directed opposite to the vibrational movement to be damped. The movement produced in this way for damping the vibrations can be produced both between parts of the paper-making machine and between part of the paper-making machine and a movable additional mass provided expressly for this purpose. A damper which can also be incorporated into the servo motor can be provided to reduce the vibrational energy. The force effect of the servo motor can be caused for example by a pressure medium, by piezo crystals or by magnetostrictive elements. If necessary, several natural forms of vibrations which occur on the paper-making machine structure to be damped can be damped by means of the method.

REFERENCES:
patent: 4420371 (1983-12-01), Dahl et al.
patent: 4429496 (1984-02-01), Marsi
patent: 4841685 (1989-06-01), Marsi et al.

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