Title:
MECHANISMS FOR DERIVING AN ACCURATE TIMING SIGNAL FROM A NOISY WAVEFORM
Document Type and Number:
WIPO Patent Application WO/2014/193732
Kind Code:
A3
Abstract:
Deriving a clean timing signal from a waveform is disclosed. A sensor-of-interest (SOI) sample set and a waveform sample set that correspond to the SOI sample set in time is collected. The waveform sample set contains information which allows to determine the angular speed of a rotating machinery. The waveform sample set is partitioned into a plurality of waveform sample subsets, and the SOI sample set is partitioned into a plurality of SOI sample subsets, each SOI sample subset corresponding to one of the plurality of waveform sample subsets. A plurality of waveform sample subset angular speeds is determined, wherein each waveform sample subset angular speed corresponds to a different waveform sample subset. An aggregate mean angular speed based on the plurality of waveform sample subset angular speeds is determined. Each SOI sample subset is resampled to the aggregate mean angular speed based on the corresponding waveform sample subset angular speed to generate a plurality of resampled SOI subsets. In this way, the effect of speed variations on the sampling of the sensor signals can be compensated and sensed parameters may be aligned with the angular position of the rotating member. Special measures based on expected pulse lengths can be taken to ensure that correct angular speed and angular position determinations can be made based on noisy voltage or current signals of electrical machines.
Inventors:
HALL RICHARD M (US)
DAS SREERUPA (US)
DAS SREERUPA (US)
Application Number:
PCT/US2014/039157
Publication Date:
February 19, 2015
Filing Date:
May 22, 2014
Export Citation:
Assignee:
LOCKHEED CORP (US)
International Classes:
G01M7/02; G01P3/48; G01P3/489; H02P7/00
Foreign References:
| US6351714B1 | 2002-02-26 | |||
| US20040186680A1 | 2004-09-23 | |||
| EP2523009A1 | 2012-11-14 | |||
| US4912661A | 1990-03-27 | |||
| US5471880A | 1995-12-05 | |||
| US20100171457A1 | 2010-07-08 | |||
| US20040027264A1 | 2004-02-12 |
Attorney, Agent or Firm:
JENSEN, Eric, P. (P.L.L.C.100 Regency Forest Drive, Suite 16, Cary NC, US)
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