Patent ID: 6796183
Filing Date: 2004-09-28
Classification: B23Q,B41F,F16F,G05D

Abstract:
A method for compensating for a mechanical oscillation at a machine shaft via at least one actuator acting directly or indirectly upon the machine shaft, the oscillation having a frequency spectrum capable of being approximated by a number of discrete frequency components, the method comprising the steps of:measuring the amplitude and phase of at least one of the discrete frequency components at at least one specific point in time; calculating at least one pair of amplitudes and phases of the harmonic torque in a closed adaptive control loop, wherein process parameters required for the calculation are updated during the control on the basis of at least two measurements of resulting disturbances at the machine shaft at different points in time with different compensation parameters; and superposing upon the at least one of the discrete frequency components of the mechanical oscillation, via the actuator, independently of the other of the discrete frequency components, at least one harmonic torque of a same frequency having a specific amplitude and phase in such a manner that an amplitude of the oscillation of the machine shaft at the same frequency is reduced.