Supports – With condition responsive control means
Reexamination Certificate
2001-09-26
2002-09-03
Ramirez, Ramon O. (Department: 3632)
Supports
With condition responsive control means
C248S638000, C248S678000
Reexamination Certificate
active
06443416
ABSTRACT:
The present invention relates generally to attenuation of vibrations imparted to a support.
BACKGROUND OF THE INVENTION
Support of equipment, having a source of vibration associated therewith, on a substructure surface by attachment thereto through a vibration isolation mount has been utilized to reduce the vibratory force impinging on the surface. Complete isolation is never achieved however because compliance or softness of the mount is necessarily limited in order to obtain adequate positional tolerance for the equipment being supported on the surface. It is therefore an important object of the present invention to provide support for such equipment loads on a surface through a vibration isolation mount with adequate positional tolerance, while permitting a reduction in vibration inducing forces transmitted therethrough.
SUMMARY OF THE INVENTION
In accordance with the present invention, the cylindrically shaped, viscoelastic component of the vibration isolation mount is interfaced throughout with a stiffening sleeve to restrict its bulging type distortion so as to strictly maintain positional tolerance for the equipment being supported. The sleeve is however made of a piezoelectric ceramic material so that it may be electrically excited under selective control to null its distortion restricting effect on the viscoelastic cylinder and reduce vibration inducing force while the equipment being supported is undergoing vibration within an operational frequency range. Toward that end, vibration of the supporting surface is continuously sensed so that when the vibration detected is within the operational frequency range, an electrical error signal is applied by a controller to the stiffening sleeve to institute said electrical excitation thereof through the controller as an active actuator for reducing vibrations.
REFERENCES:
patent: 4887788 (1989-12-01), Fischer et al.
patent: 5038306 (1991-08-01), Kellett
patent: 5291967 (1994-03-01), Aoki
patent: 5915662 (1999-06-01), Itakura et al.
patent: 6029942 (2000-02-01), Daddis, Jr. et al.
patent: 6062526 (2000-05-01), Morgenthaler
patent: 6116784 (2000-09-01), Brotz
patent: 6345966 (2002-02-01), Hahn et al.
Ramirez Ramon O.
Shuster Jacob
The United States of America as represented by the Secretary of
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