US 12,105,498 B2
Method and apparatus for analysing the condition of a machine having a rotating part
Lars-Olov Elis Hedin, Hallstahammar (SE)
Assigned to S.P.M. INSTRUMENT AB, Strangnas (SE)
Filed by S.P.M. INSTRUMENT AB, Strangnas (SE)
Filed on Feb. 3, 2023, as Appl. No. 18/105,535.
Application 14/949,317 is a division of application No. 14/311,369, filed on Jun. 23, 2014, granted, now 9,213,671, issued on Dec. 15, 2015.
Application 14/311,369 is a division of application No. 13/141,424, granted, now 8,762,104, issued on Jun. 24, 2014, previously published as PCT/SE2009/051491, filed on Dec. 22, 2009.
Application 18/105,535 is a continuation of application No. 17/024,509, filed on Sep. 17, 2020, granted, now 11,599,085.
Application 17/024,509 is a continuation of application No. 16/193,899, filed on Nov. 16, 2018, granted, now 10,788,808, issued on Sep. 29, 2020.
Application 16/193,899 is a continuation of application No. 14/949,317, filed on Nov. 23, 2015, granted, now 10,133,257, issued on Nov. 20, 2018.
Claims priority of provisional application 61/175,511, filed on May 5, 2009.
Claims priority of application No. 0850180-1 (SE), filed on Dec. 22, 2008; and application No. 0950310-3 (SE), filed on May 5, 2009.
Prior Publication US 2023/0297066 A1, Sep. 21, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G05B 19/4069 (2006.01); G01H 1/00 (2006.01); G01H 17/00 (2006.01); G01M 13/045 (2019.01); G05B 19/416 (2006.01); G06F 15/00 (2006.01)
CPC G05B 19/4069 (2013.01) [G01H 1/003 (2013.01); G01H 17/00 (2013.01); G01M 13/045 (2013.01); G05B 19/416 (2013.01); G06F 15/00 (2013.01); G05B 2219/37228 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for detecting an operating condition of a machine including a machine part associated with a shaft configured to rotate at a variable speed, the method comprising:
generating a digital measurement signal from an analog measurement signal responsive to mechanical vibration emanating from the machine detected by a vibration sensor;
applying a bandpass filter on the digital measurement signal to extract a resonance frequency signal that corresponds to vibrations emanating from the machine part;
adjusting a number of samples for each revolution in the filtered digital measurement signal based on a measured speed of revolution of the shaft, thereby generating an adjusted digital signal;
generating an enhanced adjusted signal based on amplifying repetitive signal components in the adjusted digital signal in relation to stochastic signal components; and
detecting said operating condition based on a detection of one or more peaks in the enhanced adjusted signal, wherein the machine part comprises a bearing, said bearing including a rolling element placed between an outer race bearing surface and an inner race bearing surface so that, when the shaft rotates, the rolling element moves between said outer and inner race bearing surfaces thereby causing said mechanical vibration.