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:
Dec. 08, 2009
Filed:
Sep. 19, 2008
Benjamin K. Henderson, Albuquerque, NM (US);
Steven F. Griffin, Albuquerque, NM (US);
Joel D. Gussy, Chantilly, VA (US);
Steven A. Lane, Albuquerque, NM (US);
Elizabeth L. C. Jensen, Redondo Beach, CA (US);
Richard K. Davies, Rochester Hills, MI (US);
Jennifer A. Gruits, Royal Oak, MI (US);
Paul W. Alexander, Ann Arbor, MI (US);
David M. Stevens, Athens, MI (US);
Ryan D. Majkrzak, San Clemente, CA (US);
Benjamin K. Henderson, Albuquerque, NM (US);
Steven F. Griffin, Albuquerque, NM (US);
Joel D. Gussy, Chantilly, VA (US);
Steven A. Lane, Albuquerque, NM (US);
Elizabeth L. C. Jensen, Redondo Beach, CA (US);
Richard K. Davies, Rochester Hills, MI (US);
Jennifer A. Gruits, Royal Oak, MI (US);
Paul W. Alexander, Ann Arbor, MI (US);
David M. Stevens, Athens, MI (US);
Ryan D. Majkrzak, San Clemente, CA (US);
The United States of America as represented by the Secretary of the Air Force, Washington, DC (US);
Abstract
A damper containing magneto-rheological ('MR') fluid and a plunger lies between and is mechanically coupled both to a fixture and a vibration source. The plunger has a head immersed in the MR fluid. Annular magnets circumscribe the damper and produce a magnetic field surrounding the damper. A tubular shielding sleeve composed of magnetically impermeable material surrounds a portion of the damper. The sleeve is mechanically coupled both to the fixture and the vibration source by springs, and can translate relative to the damper to affect the strength of the magnetic field acting on the MR fluid surrounding the plunger head. The sleeve oscillates responsive to vibration of the vibration source and controls the viscosity of the MR fluid surrounding the plunger head in proportion to the amplitude of the sleeve's oscillation. The resonant frequency of the sleeve is adjusted to approximate the fundamental resonance of the fixture.