Method and apparatus for actively reducing repetitive vibrations

Details Method and apparatus for actively reducing repetitive vibrations Method and apparatus for actively reducing repetitive vibrations

1990-08-30

1993-08-03

Black, Thomas G.

Boots, shoes, and leggings

364574, 381 71, H04B 1500, G10K 1100

Patent

active

052335402

ABSTRACT:
A method and apparatus for reducing repetitive vibrations in a region or structure by applying a plurality of control vibrations via a plurality of actuators (13) located in the region or structure (11) and cyclically updating the control vibrations to improve the reduction of the repetitive vibrations are disclosed. The repetitive vibrations are sensed (14) at a plurality of locations in the region or structure and decomposed into a number of frequency components. Next, a first estimate of each control vibration, formed of the same frequency components, that together will reduce the sensed vibrations is made. Each first control vibration estimate is applied to the region or structure via an actuator (13). Thereafter, each control vibration is cyclically updated to improve the reduction of the sensed vibrations whether or not changes occur in the repetitive vibrations, the region or structure (11), or the apparatus used to carry out the method of the invention. Each update cycle is begun by decomposing the sensed vibrations (which are now formed by the control vibrations and the repetitive vibrations) into the same frequency components as before. The greatest-amplitude frequency components are selected for updating. Transfer function matrices modeling the system actuator-to-sensor response characteristics are used to calculate updates for the selected frequency components. The updates are used to modify the control vibrations.

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