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:
May. 22, 2018
Filed:
Sep. 08, 2011
Mark Ellsworth Wassell, Houston, TX (US);
Daniel E. Burgess, Portland, CT (US);
Jason R. Barbely, East Islip, NY (US);
Fred Lamar Thompson, Somers, CT (US);
Mark Ellsworth Wassell, Houston, TX (US);
Daniel E. Burgess, Portland, CT (US);
Jason R. Barbely, East Islip, NY (US);
Fred Lamar Thompson, Somers, CT (US);
APS TECHNOLOGY, INC., Wallingford, CT (US);
Abstract
A system for damping vibration in a drill string can include a magnetorheological fluid valve assembly having a supply of a magnetorheological fluid. A remanent magnetic field is induced in the valve during operation that can be used to provide the magnetic field for operating the valve so as to eliminate the need to energize the coils except temporarily when changing the amount of damping required. The current to be supplied to the coil for inducing a desired magnetic field in the valve is determined based on the limiting hysteresis curve of the valve and the history of the magnetization of the value using a binary search methodology. The history of the magnetization of the valve is expressed as a series of sets of current and it resulting magnetization at which the current experienced a reversal compared to prior values of the current.