Patent · US Expired

Apparatus for suppressing structure borne noises

US6480609B1 · kind B1 · utility

20Cited by

9References

9Claims

0Family size

Assignee

Eurocopter Deutschland GmbH · DE

Inventors

Henning Strehlow · Munich, DE
Peter Jaenker · Garching bei München, DE
Rudolf Maier · Miesbach, DE

Key dates

Filing date	Mar 26, 1999
Grant date	Nov 12, 2002
Priority date	—
Expiry date	Mar 26, 2019

Classification

Technology area (CPC G)Physics
CPC primaryG10K2210/32291
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

Body or structural noise transmitted through a connector such as a strut, that connects a noise source, such as an engine, to an enclosure, such as a passenger cabin or cell of a helicopter, is suppressed by at least one piezoactuator which is excited to counteract any vibrations of the strut caused by body noise so that body noise vibrations are cancelled or at least substantially suppressed. The excitation of the piezoactuator is controlled in closed loop fashion in response to feedback signals from a sensor secured to the connector.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.