APPARATUS FOR ANALYSING THE CONDITION OF A MACHINE HAVING A ROTATING PART

• US 20160290854A1
• Filed: 01/29/2016
• Published: 10/06/2016
• Est. Priority Date: 01/18/2010
• Status: Active Grant

• Current Assignee: S.P.M. Instrument AB
• Original Assignee: S.P.M. Instrument AB
• Inventors: HEDIN, Lars-Olov
• Granted Patent: US 10,330,523 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01H 1/003 of rotating machines G01H1/10 takes precedence
• CPC Class Codes: G01M 13/045 Acoustic or vibration analysis

Abstract

A method of operating an apparatus for analysing the condition of a machine having a part rotating with a speed of rotation, includes receiving a first digital signal dependent on mechanical vibrations emanating from rotation of the part, analyzing the first digital signal so as to detect peak amplitude values during a finite time period, the finite time period corresponding to a certain amount of revolution of the part, the certain amount of revolution corresponding to more than one revolution of the monitored rotatable part, defining amplitude ranges, sorting the detected peak amplitude values into corresponding amplitude ranges so as to reflect occurrence of detected peak amplitude values within the plurality of amplitude ranges, and estimating a representative peak amplitude value in dependence on the sorted peak amplitude values and the certain amount.

Claims

2-1. A computer program for controlling the operation of an apparatus for analysing the condition of a machine having a part which is rotatable with a speed of rotation (f_ROT), the computer program comprising:

computer readable code means which, when run on an analysis apparatus, causes the computer to perform the steps of claim 1.

3. An apparatus for analysing the condition of a machine having a part rotating with a speed of rotation (f_ROT), comprising:

means for receiving a first digital signal (S_RED, S_MD, S_ENV) dependent on mechanical vibrations emanating from rotation of said part;

means for analysing said first digital signal (S_RED, S_MD, S_ENV) so as to detect peak amplitude values (Ap) during a finite time period (Pm), said finite time period corresponding to a certain amount (R) of revolution of said rotatable part;

said certain amount (R) of revolution corresponding to more than one revolution of said monitored rotatable part;

means for sorting said detected peak amplitude values (Ap) into a plurality (N_R) of corresponding amplitude ranges so as to reflect occurrence (N) of detected peak amplitude values (Ap) within said plurality of amplitude ranges; and

means for estimating a representative peak amplitude value (A_PR) in dependence on said sorted peak amplitude values (Ap) and said certain amount (R).

4. An apparatus for analysing the condition of a machine having a part rotating with a speed of rotation (f_ROT), comprising:

an input for receiving a first digital signal (S_MD) dependent on mechanical vibrations emanating from rotation of said part;

a peak detector (310) coupled to said input, said peak detector (310) being adapted to detect peak values (A_P) in said received first digital signal (S_MD, S_F, S_R, S_ENV), and

a burst rejector (330) is adapted to deliver output peak values (A_PO) on a burst rejector output (333) in response to said detected peak values (A_P); and

wherein

said burst rejector is adapted to control the delivery frequency of said output peak values (A_P, A_PO) such that said output peak values (A_P, A_PO) are delivered at a delivery frequency of f_es, wherein

f_es=e*f_ROT, wherein

f_ROT is said speed of rotation, and

e is a factor having a predetermined value.