DISTINGUISHING BETWEEN SENSOR AND PROCESS FAULTS IN A SENSOR NETWORK WITH MINIMAL FALSE ALARMS USING A BAYESIAN NETWORK BASED METHODOLOGY
First Claim
1. A method for distinguishing between a sensor fault and a process fault in a physical system, the method comprising:
- designing a Bayesian network to probabilistically relate sensor data in said physical system, wherein said physical system comprises a plurality of sensors;
collecting said sensor data from said plurality of sensors in said physical system;
deriving a conditional probability table based on said collected sensor data and said design of said Bayesian network;
identifying anomalous behavior in said physical system; and
determining, by a processor, one of said sensor fault and said process fault caused said identified anomalous behavior using belief values for said plurality of sensors and a plurality of processes in said physical system, wherein said belief values indicate a level of trust regarding the status of its associated sensors and processes not being faulty.
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Abstract
A method, system and computer program product for distinguishing between a sensor fault and a process fault in a physical system and use the results obtained to update the model. A Bayesian network is designed to probabilistically relate sensor data in the physical system which includes multiple sensors. The sensor data from the sensors in the physical system is collected. A conditional probability table is derived based on the collected sensor data and the design of the Bayesian network. Upon identifying anomalous behavior in the physical system, it is determined whether a sensor fault or a process fault caused the anomalous behavior using belief values for the sensors and processes in the physical system, where the belief values indicate a level of trust regarding the status of its associated sensors and processes not being faulty.
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Citations
34 Claims
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1. A method for distinguishing between a sensor fault and a process fault in a physical system, the method comprising:
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designing a Bayesian network to probabilistically relate sensor data in said physical system, wherein said physical system comprises a plurality of sensors; collecting said sensor data from said plurality of sensors in said physical system; deriving a conditional probability table based on said collected sensor data and said design of said Bayesian network; identifying anomalous behavior in said physical system; and determining, by a processor, one of said sensor fault and said process fault caused said identified anomalous behavior using belief values for said plurality of sensors and a plurality of processes in said physical system, wherein said belief values indicate a level of trust regarding the status of its associated sensors and processes not being faulty. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A computer program product embodied in a computer readable storage medium for distinguishing between a sensor fault and a process fault in a physical system, the computer program product comprising the programming instructions for:
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designing a Bayesian network to probabilistically relate sensor data in said physical system, wherein said physical system comprises a plurality of sensors; collecting said sensor data from said plurality of sensors in said physical system; deriving a conditional probability table based on said collected sensor data and said design of said Bayesian network; identifying anomalous behavior in said physical system; and determining one of said sensor fault and said process fault caused said identified anomalous behavior using belief values for said plurality of sensors and a plurality of processes in said physical system, wherein said belief values indicate a level of trust regarding the status of its associated sensors and processes not being faulty. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A system, comprising:
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a memory unit for storing a computer program for distinguishing between a sensor fault and a process fault in a physical system; and a processor coupled to said memory unit, wherein said processor, responsive to said computer program, comprises; circuitry for designing a Bayesian network to probabilistically relate sensor data in said physical system, wherein said physical system comprises a plurality of sensors; circuitry for collecting said sensor data from said plurality of sensors in said physical system; circuitry for deriving a conditional probability table based on said collected sensor data and said design of said Bayesian network; circuitry for identifying anomalous behavior in said physical system; and circuitry for determining one of said sensor fault and said process fault caused said identified anomalous behavior using belief values for said plurality of sensors and a plurality of processes in said physical system, wherein said belief values indicate a level of trust regarding the status of its associated sensors and processes not being faulty. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification