EP2323105B1 - Surveillance de machines - Google Patents
Surveillance de machines Download PDFInfo
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- EP2323105B1 EP2323105B1 EP20090290794 EP09290794A EP2323105B1 EP 2323105 B1 EP2323105 B1 EP 2323105B1 EP 20090290794 EP20090290794 EP 20090290794 EP 09290794 A EP09290794 A EP 09290794A EP 2323105 B1 EP2323105 B1 EP 2323105B1
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- 238000012544 monitoring process Methods 0.000 title claims description 8
- 238000000034 method Methods 0.000 claims description 28
- 230000004927 fusion Effects 0.000 claims description 23
- 230000007613 environmental effect Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims 1
- 230000005534 acoustic noise Effects 0.000 description 6
- 230000003044 adaptive effect Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 239000000523 sample Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000007499 fusion processing Methods 0.000 description 1
- 238000013101 initial test Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000007500 overflow downdraw method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C3/00—Registering or indicating the condition or the working of machines or other apparatus, other than vehicles
- G07C3/08—Registering or indicating the production of the machine either with or without registering working or idle time
Definitions
- This invention relates to monitoring of machines.
- it relates to monitoring of machinery performance, especially rotating machines and to predict failure time.
- Rotating machinery such as fans, is often mission critical and it can be very important to be able to predict the lifetime and probable time-to-failure of such machinery in order that planned maintenance and replacement may take place with minimal downtime.
- failure times are predicted by measuring at least one parameter of a machine in order to predict a time at which failure of the machine is anticipated based on said method parameter.
- the parameters measured can be acquired from a number of different types of data such as airborne acoustic noise or structure borne acoustic emissions (ie vibrations).
- airborne acoustic noise or structure borne acoustic emissions ie vibrations
- the parameters acquired from these different types of data can be negatively affected by the presence of external noise.
- This external noise may be background acoustic noise, external vibrations or noise from nearby machinery or vehicles or other externally generated noise. It might be acoustic noise or could also mean electromagnetic noise. Such external noise can lead to confusion in the system and poor results, leading to poor system performance.
- US 6,490,543 B1 and US 2003/101019 A1 disclose a method of machine monitoring comprising measuring, over time, at least two different modes of data relating to the machine to obtain independent classifiers which are combined using decision fusion in a manner which takes into account environmental factors.
- the present invention arose in an attempt to provide an improved method and system for predicting failure times of rotating machinery.
- a method of machine monitoring comprising measuring, over time, at least two different modes of data relating to the machine to obtain independent classifiers which are combined using decision fusion in a manner which takes into account environmental factors, in order to provide an indication of wear of the machine; characterised in that the decision fusion takes into account confusion of output probabilities of each classifier, such that a relatively high confusion is represented by a relatively low signal to noise ratio of the monitored data for a mode of data and a relatively low confusion is represented by a relatively high signal to noise ratio of the monitored data for a mode of data.
- the method is used for predicting time to failure (or remaining useful lifetime (RUL)).
- the modes of data may be selected from various modes, such as acoustic noise, structure-borne noise (vibration) or temperature, for example.
- a decision level adaptive fusion approach of multiple modes of data is used in order to predict failure time of the machine. This applies weightings to the fusion which takes into account the different effects that environmental factors, such as external noise, have upon the different modes.
- the fusion method takes into account confusion of output probabilities of each classifier, whereby a relatively high confusion is likely to represent a relatively low signal to noise ratio of the monitored data for a mode and a relatively low confusion likely to represent a relatively high signal to noise ratio of the monitored data for a mode.
- a fusion approach is known from 'Adaptive fusion of acoustic and visual sources for automatic speech recognition' Speech Communication 26 (1-2). 149-161, 1998 . In this example, it is used for automatic speech recognition. In some embodiments of the present invention, techniques of this type are used in a very different environment, to predict failure time of rotating or other machinery.
- apparatus for measuring one or more parameters relating to functioning of a machine comprising means for monitoring, over time, two or more modes of data independently to obtain individual and independent classifiers and means for combining the result, using a decision fusion technique with a weighting according to the effect environmental noise has on each mode of data to determine said parameter, characterised in that the decision fusion takes into account confusion of output probabilities of each classifier, such that a relatively high confusion is represented by a relatively low signal to noise ratio of the monitored data for a mode of data and a relatively low confusion is represented by a relatively high signal to noise ratio of the monitored data for a mode of data.
- the individual parameters measured may be used to obtain individual and independent classifiers, which can then be combined using decision fusion techniques in order to make a determination as to RUL or other parameters relating to functioning of a machine.
- a measure of confusion may be used to determine how each different modality (parameter) is being effected by external noise factors. For example, measures of the entropy or variance of classifier output scores can be used to determine confusion levels of each mode.
- weighting is used to weight the contribution of each mode before decision level multi-modal fusion, whereby modes that are relatively noise free are weighted more heavily than those modes that are more effected by external noise factors.
- a machine 1 may comprise a rotating machine such as a fan, or possibly a plurality of machines.
- At least two modes of data are measured. These may relate to, for example, acoustic airborne noise, structure borne noise (ie vibration), temperature (either at a point of the machine itself or in its vicinity
- Figure 1 shows two such modes, in this case this might be acoustic data (airborne noise) 2 and vibration data 3 which measures variation at the machine.
- any number of different modes of data may be measured.
- Figure 2 shows an alternative arrangement comprising sensors for measuring. acoustic noise 2, vibrations 3 and temperature 4.
- Sensors 2 to 4 in the figure may be any convenient type of sensor for measuring the relevant mode of data.
- microphones or other transducers may be used to measure acoustic signal; temperature sensors to measure temperature; or other sensors may be used to measure other parameters.
- Outputs from these are then applied to a computational unit 5 for further processing.
- this may of course comprise a number of different units, such as individual units for extracting relevant features and classifiers from each of the modes of data and then a further unit for combining these, or this may all be done in a single unit.
- Data is obtained from the various sensors at fixed or variable sampling rates over time while the machine is operating, or alternatively during an initial testing phase.
- the various modalities ie acoustic input, vibration input, temperature input, and so on
- the various modalities are processed independently, to generate respective independent classifiers.
- Figure 3 shows a typical method for determining remaining useful lifetime (RUL) of a rotating machine.
- two sets of data are obtained in this example. As described, however, more than two sets may be obtained, ie three or more types of data may be obtained.
- the sets of data are acoustic data and vibration data.
- the acoustic data is obtained from a suitable sensor 2 (eg a microphone) as raw acoustic samples 5. These samples may be obtained at periodic intervals, such as every second, every minute, every hour or any other time interval, which interval may vary. The samples will of course obtain, in addition to acoustic noise generated by the machine itself, environmental and external noise generated by external sources such as motor vehicles, external machinery and others.
- vibration data is obtained from vibration sensor 3 and used to obtain raw vibration sample 6, again at the same or different sampling rates.
- the vibrations from the machine will also be affected to external perturbations affecting the vibration of the machine and these might arise for example from air currents, the operation of other machinery or plant in the vicinity, movements of a vehicle in which the machine is in, or many other external factors which will affect the vibrations of the machine.
- Each of the samples 5 and 6 is applied to a separate and independent feature extraction engine 7, 8 respectively.
- Feature extraction is in itself an known technique and a set of representative features is obtained from each of the independent feature extraction engines 7 and 8. These are applied to respective classifiers for the acoustic data 9 and for the vibration data 10.
- Classifiers are also well-known in themselves.
- a classifier essentially represents a mapping from a discrete or continuous feature space to a discrete set of labels.
- the classifier may be, for example, an indication of wear, such that classification A means that the machine is barely worn, classification B means that the machine is beginning to wear and classification C means that the machine is nearly worn out.
- classification A may mean that the machine is zero to one third worn, classification B from one third to two thirds and classification C greater than two thirds worn, on a simplistic level.
- the outputs from the independent classifiers 9 and 10 are then combined in a decision fusion technique at a decision level fusion engine 11 which combines them in order to determine a hopefully more accurate remaining useful life (RUL) prediction 12.
- RUL remaining useful life
- the decision fusion may be a multiplicative, additive or other process, including combinations of processes.
- the output of the two classifiers 9 and 10 represent a list of all possible classes/outcome, ie worn, partially worn, not worn, and their associated scores (probability).
- the scores are simply multiplied in the decision level fusion 11 or their log scores are added and the most likely output is determined.
- a mechanism may also be provided which provides information on the reliability of each modality (ie acoustic and vibration input in the example of Figure 3 ) and thereby weightings that should be applied to each. That is, if it is found that acoustic data is more reliable in determining wear (or other parameters) than vibration data then greater emphasis and weighting may be placed upon the results from the acoustic classification than the vibration classification.
- modality ie acoustic and vibration input in the example of Figure 3
- weightings that should be applied to each. That is, if it is found that acoustic data is more reliable in determining wear (or other parameters) than vibration data then greater emphasis and weighting may be placed upon the results from the acoustic classification than the vibration classification.
- Adaptive weightings are weightings that are dynamically adjusted during the fusion process.
- the process is multiplicative using rules of probability.
- Such a scheme initially selects a candidate that maximises the product of the N-best output probabilities of the modalities.
- the N-best output probabilities of the acoustic and vibration mode are weighted according to the dispersion, variances or entropy of their N-best output probabilities. They will therefore account to some extent for the confusability of the N-best probabilities or outputs from each classifier which can be affected by external noise factors.
- the weighting scheme accounts for the reliability of each of these modes.
- each mode is then adaptively weighted before performing decision level multi-modal fusion.
- each mode is evaluated and the mode that is considered to be least effected by external noise factors is weighted more heavily than that is more affected.
- the two modes are acoustic and vibration data.
- a separate classifier 9 and 10 respectively is trained for each type of data or mode.
- For each sample presented to the classifier ie from the respective feature extraction module 7 and 8) a list of probabilities for each potential class is provided.
- the classes may represent the degree of wear, or other parameters relating to the functioning and RUL of the machine.
- the output classes for each class A to C given by the acoustic classifier 9 are:
- the vibration classifier 10 is confused in that it provides broadly similar probabilities for all three classes. This could well be due to vibration data being corrupted with noise, which confuses the classifier. Alternatively, the vibration data may not provide enough information to clearly separate the classes A to C. Thus, a relatively high 'confusion' for a mode of data is considered to represent a low signal to noise ratio for that mode, suggesting the mode is more prone to noise interference. A low 'confusion' on the other hand indicates a higher signal to noise ratio, suggesting less noise interference.
- the acoustic output can be weighted higher than the vibration output.
- the acoustic output is considered to be much less affected by external environmental factors than the vibrational classifier.
- the machine or machines upon which the process may be used might be a fan or other rotating machine operated in a factory, data centre or wind farm for example.
- Embodiments may be used to provide indication of RUL of a machine (or group of machines) or other parameters or indications relating to wear, such as an indication of when a machine or a component is likely to need servicing or maintenance, or when it is likely to be X% worn, or other indications.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Claims (12)
- Procédé de surveillance de machines comprenant la mesure, dans le temps, d'au moins deux modes de données différents relatifs à la machine pour obtenir des classificateurs indépendants qui sont combinés en utilisant la fusion de décisions d'une manière qui prend en compte des facteurs ambiants, afin de fournir une indication d'usure de la machine ; caractérisé en ce que la fusion de décisions prend en compte la confusion de probabilités de sortie de chaque classificateur, de sorte qu'une confusion relativement élevée indique un rapport signal sur bruit relativement faible des données surveillées pour un mode de données et une confusion relativement faible indique un rapport signal sur bruit relativement élevé des données surveillées pour un mode de données.
- Procédé selon la revendication 1, comprenant l'extraction d'un ou de plusieurs paramètres à partir de chaque mode de données et l'utilisation de chacun d'entre eux comme entrée d'un classificateur respectif pour ce mode, dans lequel des sorties des classificateurs sont utilisées pour déterminer les paramètres relatifs à l'usure.
- Procédé selon la revendication 1, utilisé pour estimer la durée de vie utile restante (RUL) de la machine.
- Procédé selon l'une quelconque des revendications précédentes, dans lequel la confusion est l'entropie ou des variantes de résultats de classification.
- Procédé selon l'une quelconque des revendications précédentes, dans lequel la contribution de chacune des données mesurées par un mode est pondérée et les modes qui sont considérés comme relativement sans bruit sont plus fortement pondérés que les modes qui sont davantage affectés par les facteurs de bruit extérieur.
- Procédé selon l'une quelconque des revendications précédentes, dans lequel un candidat qui maximise le produit des N meilleures probabilités de sortie des modes de données est sélectionné.
- Procédé selon la revendication 6, dans lequel la probabilité jointe Pav des modes de données de chaque classe a, étant donné l'ensemble de caractéristiques x, est déterminée comme suit :
où
Pav est la probabilité jointe des modes acoustique et de vibration de chaque classe k, étant donné l'ensemble de caractéristiques x ; l est le nombre de classes possibles, k est une des l classes ; x est l'ensemble de caractéristiques ; acoustique ou de vibration ; σa et σv sont les variances des N meilleures probabilités de sortie de la modalité audio et de vibration, respectivement. - Procédé selon l'une quelconque des revendications précédentes, dans lequel les au moins deux modalités de données sont utilisées pour générer des classificateurs respectifs et les classificateurs sont utilisés pour déterminer les effets relatifs du bruit ambiant sur la mesure de chaque mode de données respectif, et dans lequel les pondérations sont appliquées en conséquence.
- Appareil pour mesurer un ou plusieurs paramètres relatifs au fonctionnement d'une machine, comprenant des moyens pour surveiller, dans le temps, au moins deux modes de données indépendamment afin d'obtenir des classificateurs individuels et indépendants et des moyens pour combiner les classificateurs individuels et indépendants obtenus, en utilisant une technique de fusion de décisions avec une pondération conformément à l'effet que le bruit ambiant a sur chaque mode de données pour déterminer ledit paramètre, caractérisé en ce que la fusion de décisions prend en compte la confusion de probabilités de sortie de chaque classificateur, de sorte qu'une confusion relativement élevée indique un rapport signal sur bruit relativement faible des données surveillées pour un mode de données et une confusion relativement faible indique un rapport signal sur bruit relativement élevé des données surveillées pour un mode de données.
- Appareil selon la revendication 9, dans lequel le paramètre est la durée de vie utile restante (RUL).
- Appareil selon la revendication 9 ou la revendication 10, comprenant des capteurs pour détecter au moins deux modes de données et des moyens de calcul adaptés pour recevoir des entrées à partir des capteurs et pour déterminer la RUL.
- Appareil selon la revendication 11, dans lequel les capteurs servent à mesurer, respectivement, des modes de son et de vibration de données.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP20090290794 EP2323105B1 (fr) | 2009-10-16 | 2009-10-16 | Surveillance de machines |
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EP20090290794 EP2323105B1 (fr) | 2009-10-16 | 2009-10-16 | Surveillance de machines |
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EP2323105A1 EP2323105A1 (fr) | 2011-05-18 |
EP2323105B1 true EP2323105B1 (fr) | 2014-12-03 |
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RU2476935C1 (ru) * | 2011-08-26 | 2013-02-27 | Учреждение Российской академии наук Санкт-Петербургский институт информатики и автоматизации РАН (СПИИРАН) | Устройство для определения значений эксплуатационных характеристик изделия |
US10037128B2 (en) * | 2014-02-04 | 2018-07-31 | Falkonry, Inc. | Operating behavior classification interface |
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US6490543B1 (en) * | 1999-07-13 | 2002-12-03 | Scientific Monitoring Inc | Lifeometer for measuring and displaying life systems/parts |
DE10007308A1 (de) | 2000-02-17 | 2001-08-23 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Ermittlung der verbleibenden Betriebsdauer eines Produktes |
US6490545B1 (en) | 2000-03-06 | 2002-12-03 | Sony Corporation | Method and apparatus for adaptive co-verification of software and hardware designs |
GB2430039B (en) * | 2005-09-07 | 2008-06-04 | Motorola Inc | Product age monitoring device and method of use of the device |
EP1906273A1 (fr) * | 2006-09-29 | 2008-04-02 | Siemens Aktiengesellschaft | Procédé destiné au fonctionnement d'une installation à l'échelon industriel tout comme système de gestion d'une installation à l'échelon industriel |
US7914250B2 (en) * | 2006-12-08 | 2011-03-29 | General Electric Company | Method and system for estimating life of a gearbox |
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