Back to results
US 11,460,818 B2Granted
Evaluation apparatus, evaluation system, and evaluation method
AssigneeYokogawa Electric Corporation
InventorsTatenobu Seki, Nobuaki Ema, Yoshihisa Hidaka
Life of this patent
Estimating the term…
Abstract
An evaluation apparatus includes a storage unit that stores a model modeling a state of a facility provided in a plant, a simulator that adjusts a parameter that is set in the model so that a difference between an actual measurement value based on a process value of the facility in a first state and a first simulate value calculated by using the model is equal to or less than a threshold, and an estimation unit that estimates a first estimated operating point that indicates an operation state of the facility in the first state based on the adjusted parameter.
Claims9
An evaluation apparatus, comprising:
- a processor;
- a storage unit that is configured to use the processor to store a model modeling a state of a compressor provided in a plant, the model is expressed by a simultaneous equation indicating a relation among an input, an output, external factors and parameters of the compressor;
- a simulator that is configured to use the processor to adjust a rotation speed of the compressor that is set in the model so that a difference between an actual measurement value based on a process value of the compressor in a first state and a first simulate value calculated by using the model is equal to or less than a threshold;
- an estimation unit that is configured to use the processor to estimate a first estimated operating point that associates the adjusted rotation speed of the compressor, the process value, and a time of the first state to indicate an operation state of the compressor in the first state;
- and
- an evaluation unit that is configured to use the processor to evaluate a change of an operation state of the compressor based on a difference between the first estimated operating point and a second estimated operating point, wherein
- the simulator is configured to use the processor to adjust the rotation speed of the compressor so that a difference between an actual measurement value and a second simulate value calculated by using the model is equal to or less than the threshold, the actual measurement value based on a process value of the compressor in a second state that is temporally posterior to the first state,
- the estimation unit is configured to use the processor to estimate the second estimated operating point that associates the adjusted rotation speed of the compressor, the process value, and a time of the second state to indicate an operation state of the compressor in the second state, and
- the evaluation unit further is configured to use the processor to evaluate a performance of the compressor in the first state based on a difference between a performance value provided by a manufacturer of the compressor that indicates the performance of the compressor and data that indicates an estimated performance of the compressor at the first estimated operating point;
- wherein, applying the model for a use condition, an abnormality during an actual operation of the compressor for the use condition can be detected without detecting the abnormality using a sensor.
7 more elements
An evaluation method, comprising:
- adjusting a rotation speed of a compressor that is set in a model so that a difference between an actual measurement value based on a process value of a the compressor in a first state, the compressor provided in a plant, and a first simulate value calculated by using the model modeling a state of the compressor is equal to or less than a threshold;
- and
- estimating a first estimated operating point that associates the adjusted rotation speed of the compressor, the process value, and a time of the first state to indicate an operation state of the compressor in the first state;
- evaluating a change of an operation state of the compressor based on a difference between the first estimated operating point and a second estimated operating point;
- and
- evaluating a performance of the compressor in the first state based on a difference between a performance value provided by a manufacturer of the compressor that indicates the performance of the compressor and data that indicates an estimated performance of the compressor at the first estimated operating point;
- wherein
- the adjusting includes adjusting the rotation speed of the compressor so that a difference between an actual measurement value and a second simulate value calculated by using the model is equal to or less than the threshold, the actual measurement value based on a process value of the compressor in a second state that is temporally posterior to the first state, and
- the estimating includes estimating the second estimated operating point that associates the adjusted rotation speed of the compressor, the process value, and a time of the second state to indicate an operation state of the compressor in the second state;
- wherein the model is expressed by a simultaneous equation indicating a relation among an input, an output, external factors and parameters of the compressor;
- and
- wherein, applying the model for a use condition, an abnormality during an actual operation of the compressor for the use condition can be detected without detecting the abnormality using a sensor.
9 more elements
A non-transitory computer readable medium storing thereon a program for causing a computer to function as an evaluation apparatus by performing operations, comprising:
- storing, by a storage unit, that stores a model modeling a state of a compressor provided in a plant, the model is expressed by a simultaneous equation indicating a relation among an input, an output, external factors and parameters of the compressor;
- adjusting, by a simulator, a rotation speed of the compressor that is set in the model so that a difference between an actual measurement value based on a process value of the compressor in a first state and a first simulate value calculated by using the model is equal to or less than a threshold;
- estimating, by an estimation unit, a first estimated operating point that associates the adjusted rotation speed of the compressor, the process value, and a time of the first state to indicate an operation state of the compressor in the first state;
- evaluating, by an evaluation unit, a change of an operation state of the compressor based on a difference between the first estimated operating point and a second estimated operating point;
- and
- evaluating, by the evaluation unit, a performance of the compressor in the first state based on a difference between a performance value provided by a manufacturer of the compressor that indicates the performance of the compressor and data that indicates an estimated performance of the compressor at the first estimated operating point;
- wherein
- the adjusting includes adjusting the rotation speed of the compressor so that a difference between an actual measurement value and a second simulate value calculated by using the model is equal to or less than the threshold the actual measurement value based on a process value of the compressor in a second state that is temporally posterior to the first state, and
- the estimating includes estimating the second estimated operating point that associates the adjusted rotation speed of the compressor, the process value, and a time of the second state to indicate an operation state of the compressor in the second state;
- wherein, applying the model for a use condition, an abnormality during an actual operation of the compressor for the use condition can be detected without detecting the abnormality using a sensor.
7 more elements
Dependencies are inferred from the claim text.