Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Reexamination Certificate
2008-05-13
2008-05-13
Williams, Hezron (Department: 2856)
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
C073S462000
Reexamination Certificate
active
11205551
ABSTRACT:
A control system and method for actively reducing vibration in a spindle housing caused by unbalance forces on a rotating spindle, by measuring the force-induced spindle-housing motion, determining control signals based on synchronous demodulation, and provide compensation for the measured displacement to cancel or otherwise reduce or attenuate the vibration. In particular, the synchronous demodulation technique is performed to recover a measured spindle housing displacement signal related only to the rotation of a machine tool spindle, and consequently rejects measured displacement not related to spindle motion or synchronous to a cycle of revolution. Furthermore, the controller actuates at least one voice-coil (VC) motor, to cancel the original force-induced motion, and adapts the magnitude of voice coil signal until this measured displacement signal is brought to a null. In order to adjust the signal to a null, it must have the correct phase relative to the spindle angle. The feedback phase signal is used to adjust a common (to both outputs) commutation offset register (offset relative to spindle encoder angle) to force the feedback phase signal output to a null. Once both of these feedback signals are null, the system is compensating properly for the spindle-induced motion.
REFERENCES:
patent: 4464935 (1984-08-01), McHugh
patent: 5369348 (1994-11-01), Gennesseaux
patent: 5796002 (1998-08-01), Layton
patent: 6140790 (2000-10-01), Heine et al.
patent: 6402089 (2002-06-01), Kiss et al.
patent: 2003/0050716 (2003-03-01), Helland
patent: 2004/0154413 (2004-08-01), Coy et al.
Lawrence Livermore National Security LLC
Lee John H.
Tak James S.
LandOfFree
Adaptive vibration control using synchronous demodulation... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adaptive vibration control using synchronous demodulation..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive vibration control using synchronous demodulation... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3909443