Maintenance planning assistance system and method for generating facility maintenance plan

Abstract

To assist planning a facility maintenance plan.SOLUTION: A maintenance planning assistance system holds device state information for managing a recommended maintenance timing for each facility device. The recommended maintenance timing refers to a point of time at which cost required for maintenance of a device is low and a failure rate of the device is low. The maintenance planning assistance system: generates a plurality of lists which is for each facility and which serves as a first optimization problem for which a device list of a facility on which maintenance is performed at a maintenance timing is retrieved, by using a constraint condition related to a probability of a failure occurrence in the facility, and an evaluation value calculated by using a facility maintenance cost loss that evaluates an economic loss due to device maintenance at a timing offset from the recommended maintenance timing; and generates a plurality of maintenance plans which is for a plurality of facilities and which serves as a second optimization problem for which a maintenance plan, which is a combination of maintenance date and time, resource allocation, and list, is retrieved, by using a second constraint condition related to the probability of a failure occurrence in the facility and resources required for the device maintenance, and a total evaluation value calculated by using the evaluation value.SELECTED DRAWING: Figure 1

Claims

1. A maintenance planning support system that generates a maintenance plan for equipment that is used to implement a service and that is made up of a plurality of devices, a computer having a processor, a storage device connected to the processor, and an interface connected to the processor; Connecting to a system that operates a plurality of the facilities; storing equipment status information for managing recommended maintenance times for each of the plurality of devices in the facility; the recommended maintenance period is a period when the cost required for maintaining the device is low and the failure rate of the device is low; The processor: a first process of generating a plurality of maintenance equipment lists for each piece of equipment as a first optimization problem of searching for a maintenance equipment list, which is a combination of the equipment of the equipment to be maintained at a maintenance time, using a first constraint condition related to the probability of a malfunction occurring in the equipment and an evaluation value calculated using an equipment maintenance cost loss that evaluates an economic loss due to maintenance of the equipment at a time shifted from the recommended maintenance time; a second process of generating a plurality of maintenance plans as a second optimization problem for searching for a maintenance plan that is a combination of maintenance dates and times, resource allocation, and the maintenance equipment list for each of the plurality of pieces of equipment, using a second constraint condition related to the total probability of failure occurrence of the equipment and the resources required for maintaining the equipment, and an overall evaluation value calculated using the evaluation value; A maintenance planning support system characterized by executing the above.

2. 2. The maintenance planning support system according to claim 1, In the first process, the processor generating a candidate maintenance equipment list for the facility; calculating a minimum maintenance cost per unit time when maintenance is performed at the recommended maintenance time for each of the plurality of devices of the facility as a first minimum cost; Calculating a maintenance cost per unit time for each of the plurality of devices of the facility when maintenance is performed during a maintenance period as a first comparative cost; For each of the plurality of devices in the facility, a difference between the first comparative cost and the first minimum cost is calculated as an equipment maintenance cost loss; Calculating the total of the equipment maintenance cost losses for the plurality of devices of the facility as the equipment maintenance cost loss; Calculating the evaluation value using the amount of work required for maintenance of the equipment to be maintained in the candidate maintenance equipment list and the equipment maintenance cost loss; generating a new candidate maintenance equipment list by solving the first optimization problem using the first constraint condition and the evaluation value; In the second process, the processor generating candidate maintenance plans for each of the plurality of pieces of equipment; Calculating the sum of the evaluation values ​​corresponding to the maintenance equipment lists of each of the plurality of candidate maintenance plans as the overall evaluation value; a maintenance planning support system for generating a new group of candidate maintenance plans by solving the second optimization problem using the second constraint condition and the comprehensive evaluation value.

3. 3. The maintenance planning support system according to claim 2, In the first process, the processor calculating a minimum cost per unit time of work when all of the devices to be maintained in the candidate maintenance device list are maintained at the recommended maintenance time as a second minimum cost; Calculating, as a second comparative cost, the cost of work per unit time when all of the equipment to be maintained in the candidate maintenance equipment list is maintained at the maintenance time; calculating a difference between the second comparative cost and the second minimum cost as an equipment maintenance cost correction value for evaluating the effect of reducing maintenance costs when the plurality of devices are simultaneously maintained; A maintenance plan planning support system characterized in that the evaluation value is calculated by adding the equipment maintenance cost loss and the equipment maintenance cost correction value.

4. 4. The maintenance planning support system according to claim 3, storing information for managing the maintenance deadline of the equipment; In the second process, the processor calculating a maintenance cost per unit time in a case where all of the devices to be maintained in the maintenance device list of the facility are maintained during the maintenance deadline as a third minimum cost; Calculating, as a third comparative cost, a maintenance cost per unit time in a case where all of the devices to be maintained in the maintenance device list of the facility are maintained during the maintenance period; calculating a difference between the third comparative cost and the third minimum cost as a second equipment maintenance cost loss for evaluating an economic loss when maintenance is performed at intervals shorter than the maintenance deadline; A maintenance plan planning support system characterized by calculating the sum of the evaluation value corresponding to the maintenance equipment list of each of the plurality of candidate maintenance plans and the second equipment maintenance cost loss as the overall evaluation value.

5. 2. The maintenance planning support system according to claim 1, The processor: Select the equipment; Generate potential maintenance times; Calculating a total value of failure rates when maintenance is performed at the proposed maintenance period for each of the plurality of devices of the selected facility as an equipment failure rate; calculating, as a second evaluation value, a total maintenance cost per unit time when maintenance is performed on each of the plurality of devices of the selected facility at the proposed maintenance period; determining the candidate maintenance periods as a third optimization problem that searches for candidate maintenance periods for the plurality of devices of the selected facility using the constraint condition on the equipment failure rate and the second evaluation value; a maintenance plan creation support system that registers the proposed maintenance period, which is a result of executing the third optimization problem, as the recommended maintenance time in the equipment status information.

6. 2. The maintenance planning support system according to claim 1, Holding operation information for managing an operation plan for the facility; The processor: If there is a maintenance plan that does not satisfy the second constraint condition, updating the operation information to replace the operation plan of the equipment having an older operation start date and time with the operation plan of the equipment having a newer operation start date and time; A maintenance planning support system characterized by executing the first process and the second process again.

7. A method for generating a maintenance plan for equipment that is used to perform a service and that is composed of multiple devices, executed by a maintenance plan creation support system, comprising: The maintenance plan planning support system includes: a computer having a processor, a storage device connected to the processor, and an interface connected to the processor; Connecting to a system that operates a plurality of the facilities; storing equipment status information for managing recommended maintenance times for each of the plurality of devices in the facility; the recommended maintenance period is a period when the cost required for maintaining the device is low and the failure rate of the device is low; The method for generating a maintenance plan includes: a first step in which the processor generates a plurality of maintenance equipment lists for each piece of equipment as a first optimization problem to search for a maintenance equipment list, which is a combination of the equipment of the equipment to be maintained at a maintenance time, using a first constraint condition related to the probability of a malfunction occurring in the equipment and an evaluation value calculated using an equipment maintenance cost loss that evaluates an economic loss due to maintenance of the equipment at a time shifted from the recommended maintenance time; a second step in which the processor generates a plurality of maintenance plans as a second optimization problem for searching for a maintenance plan that is a combination of a maintenance date and time, an allocation of the resources, and the maintenance equipment list for each of the plurality of pieces of equipment, using a second constraint condition related to the total probability of failure occurrence of the equipment and the resources required for maintaining the equipment, and an overall evaluation value calculated using the evaluation value; A method for generating a maintenance plan, comprising:

8. 8. A method for generating a maintenance plan according to claim 7, comprising: The first step comprises: generating a candidate maintenance equipment list for the facility; a step by the processor calculating, as a first minimum cost, a minimum maintenance cost per unit time when maintenance is performed at the recommended maintenance time for each of the plurality of devices of the facility; The processor calculates, as a first comparison cost, a maintenance cost per unit time when each of the plurality of devices of the facility is maintained during a maintenance period; The processor calculates, for each of the plurality of pieces of equipment in the facility, a difference between the first comparative cost and the first minimum cost as an equipment maintenance cost loss; The processor calculates the total of the equipment maintenance cost losses of the plurality of devices of the facility as the equipment maintenance cost loss; The processor calculates the evaluation value using the amount of work required for maintenance of the equipment to be maintained in the candidate maintenance equipment list and the equipment maintenance cost loss; generating a new candidate maintenance equipment list by solving the first optimization problem using the first constraint and the evaluation value; The second step includes: generating a candidate maintenance plan for each of the plurality of pieces of equipment; a step of the processor calculating, as the overall evaluation value, a sum of the evaluation values ​​corresponding to the maintenance equipment lists of each of the plurality of candidate maintenance plans; and generating a new set of candidate maintenance plans by solving the second optimization problem using the second constraint and the overall evaluation value.

9. 9. A method for generating a maintenance plan according to claim 8, comprising: The first step comprises: a step of calculating, by the processor, a minimum value of work costs per unit time when all of the devices to be maintained in the candidate maintenance device list are maintained at the recommended maintenance time, as a second minimum cost; The processor calculates, as a second comparative cost, a cost of work per unit time when all of the equipment to be maintained in the candidate maintenance equipment list is maintained at the maintenance time; a step in which the processor calculates a difference between the second comparison cost and the second minimum cost as an equipment maintenance cost correction value that evaluates the effect of reducing maintenance costs when the plurality of devices are simultaneously maintained; The method for generating a maintenance plan, comprising: a step in which the processor calculates the evaluation value by adding the equipment maintenance cost loss and the equipment maintenance cost correction value.

10. 10. The maintenance plan generation method according to claim 9, further comprising: the maintenance planning support system holds information for managing a maintenance deadline for the equipment, The second step includes: a step in which the processor calculates, as a third minimum cost, a maintenance cost per unit time in a case where all of the devices to be maintained in the maintenance device list of the facility are maintained by the maintenance due date; The processor calculates, as a third comparative cost, a maintenance cost per unit time when all of the devices to be maintained in the maintenance device list of the facility are maintained during the maintenance period; a step in which the processor calculates a difference between the third comparative cost and the third minimum cost as a second equipment maintenance cost loss for evaluating an economic loss when maintenance is performed at an interval shorter than the maintenance deadline; A method for generating a maintenance plan, comprising a step in which the processor calculates the sum of the evaluation value and the second equipment maintenance cost loss corresponding to the maintenance equipment list of each of the plurality of candidate maintenance plans as the overall evaluation value.

11. 8. A method for generating a maintenance plan according to claim 7, comprising: the processor selecting the facility; generating candidate maintenance times by the processor; The processor calculates, as an equipment failure rate, a total value of failure rates when maintenance is performed at the proposed maintenance period for each of the plurality of devices of the selected equipment; a step in which the processor calculates, as a second evaluation value, a total maintenance cost per unit time when maintenance is performed at the proposed maintenance period for each of the plurality of devices of the selected facility; determining the candidate maintenance periods as a third optimization problem that searches for candidate maintenance periods for the plurality of devices of the selected equipment using the constraint condition related to the equipment failure rate and the second evaluation value; and registering, by the processor, the candidate maintenance period that is a result of executing the third optimization problem as the recommended maintenance timing in the equipment status information.

12. 8. A method for generating a maintenance plan according to claim 7, comprising: the maintenance plan formulation support system holds operation information for managing an operation plan for the facility, When the maintenance plan that does not satisfy the second constraint exists, the processor executes an update of the operation information to replace the operation plan of the equipment having an older operation start date and time with the operation plan of the equipment having a newer operation start date and time; The method for generating a maintenance plan, wherein the processor executes the first step and the second step again.

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