The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 03, 1993
Filed:
Aug. 30, 1990
Anders O Andersson, Seattle, WA (US);
Richard A Russo, Everett, WA (US);
The Boeing Company, Seattle, WA (US);
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.