Method Of Identifying Abnormal Operation Of A Machine And An Apparatus Therefor
First Claim
1. An apparatus for identifying abnormal operation of a sub-assembly of an industrial machine having at least one servo motor, the apparatus comprising:
- a sampling unit arranged to sample at least one characteristic parameter of the industrial machine, said at least one characteristic parameter comprising signal corresponding, in use, to torque values of said servo-motor;
a storage device for storing predetermined statistical parameters determined from a plurality of sample of the characteristic parameter(s) of known similar industrial machines having similar sub-assemblies, that are known to be operating correctly, the statistical parameters defining a statistical range of values of the at least one characteristic parameter for normal operation of said sub-assembly; and
a processing unit coupled to a storage device and to the sampling unit for determining whether the at least one sampled characteristic parameter falls within the statistical range of values for normal operation of the industrial machine and for generating an alarm signal if the at least one sampled characteristic parameter falls outside the statistical range of values for normal operation of the industrial machine, wherein the processing unit scales the at least one sampled characteristic parameter to the statistical range of values for normal operation of the industrial machine prior to the determination by the processing unit whether the at least one sampled characteristic parameter is within the statistical range of values for normal operation of the industrial machine.
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Abstract
A method of identifying abnormal operation of an industrial machine includes the step of determining statistical parameters from a plurality of samples of characteristic parameter(s) of known similar industrial machines in normal operation and storing them, the statistical parameters defining a statistical range of values of the characteristic parameter(s) for normal operation of the industrial machine. The characteristic parameter(s) of a machine being monitored are sampled and a determination (702) is made as to whether sampled characteristic parameter(s) falls within the statistical range of values for normal operation of the industrial machine. If the sampled characteristic parameter falls outside the statistical range of values for normal operation of the industrial machine an alarm signal is generated (706).
38 Citations
16 Claims
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1. An apparatus for identifying abnormal operation of a sub-assembly of an industrial machine having at least one servo motor, the apparatus comprising:
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a sampling unit arranged to sample at least one characteristic parameter of the industrial machine, said at least one characteristic parameter comprising signal corresponding, in use, to torque values of said servo-motor; a storage device for storing predetermined statistical parameters determined from a plurality of sample of the characteristic parameter(s) of known similar industrial machines having similar sub-assemblies, that are known to be operating correctly, the statistical parameters defining a statistical range of values of the at least one characteristic parameter for normal operation of said sub-assembly; and a processing unit coupled to a storage device and to the sampling unit for determining whether the at least one sampled characteristic parameter falls within the statistical range of values for normal operation of the industrial machine and for generating an alarm signal if the at least one sampled characteristic parameter falls outside the statistical range of values for normal operation of the industrial machine, wherein the processing unit scales the at least one sampled characteristic parameter to the statistical range of values for normal operation of the industrial machine prior to the determination by the processing unit whether the at least one sampled characteristic parameter is within the statistical range of values for normal operation of the industrial machine. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of identifying abnormal operation of a sub-assembly of an industrial machine having at least one servo motor, the method comprising the steps of:
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sampling at least one characteristic parameter of the industrial machine, said at least one characteristic parameter comprising, a signal corresponding, in use, to torque values of said servo-motor; retrieving previously stored statistical parameters determined from a plurality of samples of the characteristic parameter(s) of known similar industrial machines having similar sub-assemblies, that are known to be operating correctly, the statistical parameters defining a statistical range or values of the at least one characteristic parameter for normal operation of said sub-assembly of the industrial machine; determining whether the at least one sampled characteristic parameter falls within the statistical range of values for normal operation of the industrial machine; and generating an alarm signal if the at least one sampled characteristic parameter falls outside the statistical range of values for normal operation of the industrial machine, wherein the processing unit scales the at least one sampled characteristic parameter to the statistical range of values for normal operation of the industrial machine prior to the determination by the processing unit whether the at least one sampled characteristic parameter is within the statistical range of values for normal operation of the industrial machine. - View Dependent Claims (9, 10, 11, 12)
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13. (canceled)
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14. (canceled)
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15. (canceled)
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16. (canceled)
Specification