Maintenance support method, maintenance support apparatus, and program

Abstract

To provide information for performing maintenance at more appropriate timing for each device when performing maintenance of devices constituting a maintenance object.SOLUTION: A method for supporting maintenance of a maintenance target 107 including a plurality of devices includes an input step of inputting a repair period required for repair of the devices included in the maintenance target 107, a prediction step of predicting a probability of occurrence of damage based on a failure mode of the devices, an estimation step of estimating a risk of occurrence of a problem in an operation of the maintenance target 107 using the probability of occurrence of damage, and a cost calculation step of calculating a cost using the repair period and the risk.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a maintenance support method, a maintenance support device, and a program that are useful in the maintenance (preservation and maintenance) of a system consisting of subsystems such as multiple devices, particularly a facility consisting of multiple devices such as a power plant or a production line. [Background technology]

[0002] Patent Document 1 describes an example of a maintenance support device, maintenance support method, and program that can obtain information for performing replacement, repair, etc. at more appropriate timing for each piece of equipment when performing maintenance on a maintenance object. The device, method, and program include a load distribution estimation unit that estimates at least one of the load on the maintenance object over time and the load on the equipment that makes up the maintenance object over time, a failure probability estimation unit that predicts the failure probability, which is the probability that a failure will occur in the equipment over time, based on the estimated load, and a risk / cost calculation unit that estimates the risk when a disruption occurs in the operation of the maintenance object based on the predicted failure probability, and estimates the cost required to maintain the maintenance object based on the failure probability.

[0003] As an example of a plant risk assessment method and apparatus that can easily assess plant risk and, furthermore, economic efficiency by automatically changing a fault tree when the maintenance method and configuration of equipment are changed, Patent Document 2 describes the following: a change in the maintenance method or configuration of the equipment that constitutes the plant is input; a partial fault tree that shows the relationship between the failure mode and failure probability for the equipment that constitutes the plant is referenced to determine the failure mode and failure probability of the equipment when the change is made; and an overall fault tree that is used to determine the shutdown risk of a plant consisting of multiple equipment is referenced to determine the plant shutdown risk when the change is made to the equipment. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-157092 [Patent Document 2] Japanese Patent Application Laid-Open No. 2024-16549 Summary of the Invention [Problem to be solved by the invention]

[0005] Systems such as power plants, manufacturing lines, and buildings are made up of multiple subsystems, such as the systems, the equipment that make up the systems, the piping and electrical circuits, and the parts that make up these equipment, piping, and electrical circuits.

[0006] When operating such a system, O&M is carried out, which combines management of the operating status (Operation) to ensure stable use and maintenance (Maintenance) to keep the system functioning normally.

[0007] Maintenance can be broadly divided into three types: time-based maintenance, condition-based maintenance, and post-event maintenance, which deals with events such as damage after they occur.The method to be selected depends on the operational constraints, operating conditions, and subsystem characteristics of the system in question.

[0008] In the O&M field, inventions and proposals have been made from various perspectives, such as reducing the labor required for operation, improving availability, detecting abnormalities, improving maintenance efficiency, and streamlining cost evaluation.

[0009] As an example of an invention related to O&M, Patent Document 1 devise a maintenance support device, a maintenance support method, and a program that aim to present information for performing replacement, repair, etc. at a more appropriate time for each piece of equipment when performing maintenance on the equipment.

[0010] Furthermore, Patent Document 2 devise a plant risk assessment method and device that targets a plant consisting of multiple pieces of equipment and automatically changes the fault tree when the maintenance method and configuration of the equipment are changed, thereby making it possible to easily assess plant risk and economic efficiency.

[0011] However, Patent Documents 1 and 2 focus on improving the efficiency of maintenance by reviewing the methods and timing to address the risk of system shutdown, but do not provide information to perform maintenance at a more appropriate time for each of the devices that make up the maintenance target, which makes it clear that there is room for improvement.

[0012] In particular, it became clear that there is room for improvement in systems with robust configurations that can operate at reduced rated output or output even if some of the equipment that makes up the system fails, as it is not possible to obtain information to perform replacement or repairs at the appropriate time for each piece of equipment.

[0013] The present invention provides a maintenance support method, a maintenance support device, and a program that, when performing maintenance on devices that constitute the maintenance target, provide information for performing maintenance at more appropriate timing for each device. [Means for solving the problem]

[0014] The present invention includes a plurality of means for solving the above-mentioned problems, and one example thereof is a method for supporting the maintenance of a maintenance object consisting of a plurality of devices, the maintenance support method comprising: an input step of inputting a repair period required for repairing the devices that make up the maintenance object; a prediction step of predicting the probability of damage occurring based on a failure mode of the devices; an estimation step of estimating the risk of whether or not a disruption will occur in the operation of the maintenance object using the probability predicted in the prediction step; and a cost calculation step of calculating costs using the repair period and the risk.

[0015] Another example is a maintenance support device that supports the maintenance of a maintenance object consisting of a plurality of devices, and includes: an input unit that inputs a repair period required to repair the devices that make up the maintenance object; a prediction unit that predicts the probability of damage occurring based on the failure mode of the devices; an estimation unit that uses the probability predicted by the prediction unit to estimate the risk of whether or not the operation of the maintenance object will be affected; and a cost calculation unit that calculates costs using the repair period and the risk.

[0016] As another example, a program for supporting the maintenance of a maintenance object consisting of a plurality of devices, the program causing a processing device to execute the following steps: an input procedure for inputting the repair period required to repair the devices that make up the maintenance object; a prediction procedure for predicting the probability of damage occurring based on the failure mode of the devices; an estimation procedure for estimating the risk of whether or not the operation of the maintenance object will be disrupted using the probability predicted in the prediction procedure; and a cost calculation procedure for calculating costs using the repair period and the risk. [Effects of the Invention]

[0017] According to the present invention, when performing maintenance on devices that constitute the maintenance target, it is possible to provide information for performing maintenance at a more appropriate time for each device. Problems, configurations, and effects other than those described above will become clear from the description of the following embodiments. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a diagram illustrating an overall configuration of a maintenance support device according to an embodiment. [Figure 2] 1 is a flowchart illustrating a processing procedure of a maintenance support method according to an embodiment. [Figure 3] 10 is an example of a database into which a time period required for repairs is input, which is part of the configuration of the maintenance support device according to the embodiment. [Figure 4] 1 is an example of a fault tree used for risk assessment in the maintenance support method of the embodiment. [Figure 5]10 is an example of an output of a cost calculation result displayed in the maintenance support device and the maintenance support method according to the embodiment. [Figure 6] 10 is an example of an output of a cost calculation result displayed in the maintenance support device and the maintenance support method according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] Embodiments of the maintenance support method, maintenance support device, and program of the present invention will be described with reference to Figures 1 to 6. In the drawings used in this specification, identical or corresponding components are designated by identical or similar reference numerals, and repeated explanations of these components may be omitted.

[0020] First, the configuration of a maintenance support device according to an embodiment of the present invention, which can suitably execute a maintenance support method and program according to an embodiment of the present invention, will be described with reference to Fig. 1. Fig. 1 shows an example of the overall configuration employing the maintenance support device, maintenance support method, and program according to an embodiment.

[0021] The maintenance support device 101 shown in FIG. 1 is a device that supports the creation of a plan for maintaining a maintenance target 107, and is composed of a calculation unit 110, a database 120, a processing unit 130, a communication unit 140, and an input / output unit 150.

[0022] The maintenance target 107 is a target for maintenance and is composed of a plurality of devices. The configuration of the maintenance target 107 is not particularly limited as long as it is a system that requires maintenance. Examples include mobile objects such as automobiles, railroad cars, airplanes, trucks, buses, and ships, facilities such as stations and maintenance factories required for operating mobile objects, manufacturing factories for industrial products, and plants such as power plants.

[0023] Furthermore, as shown in FIG. 1, a control device 105 that controls the equipment that makes up the power plant, sensors 106 attached to the equipment to grasp the status of the equipment, and a network 104 that connects them to the maintenance support device 101 are also shown.

[0024] Of these, in this embodiment, the following description will be given taking a power plant as an example of the maintenance target 107. Therefore, the maintenance support device 101 of this embodiment is an example of a maintenance support device that supports the creation of a maintenance plan such as inspection, replacement, and repair of systems and equipment that are subsystems that make up a power plant when performing maintenance on the power plant.

[0025] As shown in FIG. 1, external components of the maintenance support device 101 but supporting them include an input device 102 that serves as an interface with the maintenance manager of the power generation system and inputs information necessary to use the maintenance support device 101, and a display device 103 that displays the processing results of the maintenance support device 101.

[0026] The calculation unit 110 stores a load estimation unit 111, a failure probability estimation unit 112, a risk calculation unit 113, a cost calculation unit 114, and a result output unit 115 as programs that realize the functions described in this embodiment.

[0027] Of these, the failure probability estimation unit 112 is the entity that executes the prediction step (prediction procedure) that predicts the probability of damage occurring based on the failure mode of the equipment, the risk calculation unit 113 is the entity that executes the estimation step (estimation procedure) that estimates the risk of whether or not the operation of the maintenance target 107 will be disrupted using the damage occurrence probability, and the cost calculation unit 114 is the entity that executes the cost calculation step (cost calculation procedure) that calculates the cost using the repair period and risk.

[0028] The database 120 also stores various types of information used in this embodiment, such as operation information 121, system configuration information 122, power generation cost information 123, and equipment information 124 including "damage mode," "maintenance history," "repair cost," and "repair period."

[0029] The process and operation of storing information in the database 120 constitutes an input step (input procedure) for inputting the repair period required for repairing the devices constituting the maintenance target 107 .

[0030] The processing unit 130 is connected to the calculation unit 110, the database 120, the communication unit 140, and the input / output unit 150. The processing unit 130 executes the calculation program stored in the calculation unit 110 using data obtained from the database 120 and the communication unit 140 based on the maintenance evaluation conditions and output requests input by the maintenance manager using the input device 102, and sends the execution results to the display device 103.

[0031] The communication unit 140 is connected to the control device 105 and the sensor 106 via the network 104, and transmits information acquired by the control device 105 and the sensor 106 to the database 120 and the processing unit 130.

[0032] The input / output unit 150 connects the maintenance support device 101 to the input device 102 and the display device 103. The maintenance manager can check the results of the processing performed by the maintenance support device 101 by looking at the display shown on the display device 103.

[0033] Next, the flow of the maintenance support method of this embodiment, which is preferably executed by the maintenance support device 101 shown in FIG. 1, will be described with reference to FIGS.

[0034] First, the overall flow will be explained using Fig. 2. Fig. 2 is a flowchart explaining the processing of the maintenance support method.

[0035] In the maintenance condition input process P1, which is the first process in the flowchart shown in FIG. 2, the maintenance manager inputs evaluation conditions required for considering maintenance and information to be stored in the database 120 from the input device 102 shown in FIG.

[0036] FIG. 3 shows an example of input of part of the equipment information 124 stored in the database 120, in which equipment name 401, part name 402, failure mode 403, repair cost 404, and repair period 405 are input in table format.

[0037] In the table of device information 124 in FIG. 3, device name 401 indicates a part of device A and device B, part name 402 indicates that device A is composed of parts A, B, and C, failure mode 403 indicates multiple failure modes expected for parts A, B, and C, and repair cost 404 and repair period 405 indicate the cost and period required for maintenance for each failure mode.

[0038] Next, as the second to sixth processes (P2, P3, P4, P5, P6) in the flowchart shown in Fig. 2, the programs of the load estimation unit 111, failure probability estimation unit 112, risk calculation unit 113, cost calculation unit 114, and result output unit 115 shown in Fig. 1 are executed according to the evaluation conditions input in the maintenance condition input process P1. Details are given below.

[0039] In the load estimation process P2 shown in FIG. 2, the load acting on each of the devices constituting the maintenance target 107 is calculated based on the maintenance condition input process P1 described above and the operation information 121 and device information 124 stored in the database 120.

[0040] Next, in the failure probability estimation process P3 shown in the flowchart of FIG. 2, the load of each device estimated in the previous load estimation process P2 and the device information 124 stored in the database 120 are referenced to estimate the failure probability for each device and its component for each failure mode.

[0041] Next, in the risk calculation process P4 shown in the flowchart of FIG. 2, a fault tree 300 shown in FIG. 4 is constructed based on the failure probability for each failure mode of each device estimated in the failure probability estimation process P3, and the system configuration information 122 and device information 124 stored in the database 120, and the risk of operation shutdown or reduction in operating output of the maintenance target due to failure of each device is confirmed.

[0042] Here, the fault tree 300 shown in FIG. 4 shows a case where the system stops operation 301 due to loss of function A 310, loss of function B 320, ..., loss of function N 330, and further shows that loss of function A 310 is caused by either failure of equipment A 311 or failure of equipment B 312.

[0043] Among these, equipment A failure 311 indicates a case where it is caused by part A malfunction 3111 or part B damage 3112. Taking into consideration the probability of part A malfunction 3111, part B damage 3112, and the resulting equipment A failure 311, other equipment B failure 312, and equipment C failure 321 estimated in the failure probability estimation process P3 described above, the probability of occurrence of function A loss 310, function B loss 320, and function N loss 330, and the risk of operation shutdown or reduction in operating output caused by any of these events is evaluated.

[0044] Next, in a cost calculation process P5 shown in the flowchart of FIG. 2, the cost of performing maintenance for the risk of operation stoppage or reduction in operation output determined in the risk calculation process P4 is calculated.

[0045] For example, in cost calculation, the loss amount LC due to the shutdown or reduction in operating output calculated in the risk calculation process P4 is calculated as net In the cost calculation step, this can be calculated by adding up the loss caused by the maintenance target 107 not being able to operate during the repair period using risk and the repair costs of the damaged equipment, as shown in equation (1) below. LC net = C Rpr + C LG *t Rpr ··· (1)

[0046] Here, C in formula (1) Rpr is the cost of maintenance, C LG is the profit per unit time when the system is operating normally, t Rpr is the period required for maintenance. Of this, the maintenance cost C Rpr and maintenance period t Rpr3. The repair cost 404 and repair period 405 in the equipment information 124 database shown in FIG. 3 are referenced. In addition, the profit C LG The profit amount that can be obtained per unit time when the maintenance target is operating normally, which is stored in advance in the database of the power generation unit price information 123, is referenced.

[0047] In the result output process P6, which is the last process shown in the flowchart in Fig. 2, the contents of the evaluations performed in the maintenance condition input process P1, the load estimation process P2, the failure probability estimation process P3, the risk calculation process P4, and the cost calculation process P5 are displayed on the display device 103 shown in Fig. 1. Figs. 5 and 6 show examples of output of cost calculation results.

[0048] As a result, the evaluation timing for executing the output process P6 is, for example, when the maintenance target 107 is a system that has regular inspections built in, such as a power generation plant, during regular inspections or at the overall timing of an unused system among multiple systems.

[0049] First, Figure 5 shows the most basic example of cost calculation results, comparing the presence and absence of a malfunction, with the horizontal axis representing time [h] and the vertical axis representing cumulative operating revenue [yen]. It shows the change over time in cumulative operating revenue when the equipment does not malfunction 501 and the change over time in cumulative operating revenue when the equipment malfunctions 502.

[0050] The time change 502 of the cumulative operating revenue when equipment failure occurs indicates that time t1 is the time when the equipment failure occurred and time t2 is the time when repairs were completed, and from time t2 onwards, recovery is complete and the maintenance target is operating normally.

[0051] In the time change 502 of the cumulative operating profit value, the maintenance cost C Rpr The maintenance period from time t1 to time t2 is t Rpr Profit C obtained per unit time when operating normally LGIt is clear at a glance that the cumulative operating revenue does not increase.

[0052] Furthermore, after time t2, when the equipment is restored, the maintenance target is operating normally, and the cumulative operating revenue value increases in proportion to time with the same gradient as the time change 501 of the cumulative operating revenue value when the equipment does not break down.

[0053] Next, Figure 6 shows the time change 601 of the cumulative operating revenue value when equipment is maintained on a time basis regardless of whether it has broken down, as well as the time change 602a of the first cumulative operating revenue value and the time change 602b of the second cumulative operating revenue value when the equipment has broken down and different repair methods are used.

[0054] Here, in the first cumulative operating profit value time change 602a and the second cumulative operating profit value time change 602b when equipment breaks down, when the respective repair methods are repair method a and repair method b, the case where repair cost 404 is repair method a > repair method b and repair period 405 is repair method a < repair method b is taken into consideration.

[0055] As shown in FIGS. 5 and 6, the method may further include a display step of displaying a graph in which the cost calculated in the cost calculation step is on the vertical axis and the period is on the horizontal axis.

[0056] As shown in FIG. 6, the time change 601 of the accumulated operating profit value in the case of time-based maintenance is shown for the case of performing two regular inspections. The accumulated operating profit value equivalent to the repair cost 404 decreases due to the inspections at time tm1 and time tm1', and the time from time tm1 to time tm2 and the time from time tm1' to time tm2' are the maintenance periods t Rpr The profit C that can be obtained per unit time under normal operation conditions LG It can be seen that the cumulative operating profit does not increase. It can also be seen that the cumulative operating profit increases in proportion to time between time tm2 and time tm1' and after time tm2' after the equipment is restored.

[0057] On the other hand, in the first cumulative operation profit time change 602a when equipment breaks down, the failure occurs at time t1, which is after the regular inspection time tm1 in the cumulative operation profit time change 601 when performing maintenance based on time, and the cumulative operation profit value equivalent to the repair cost 404 drops, and the period tRpr is the maintenance period from time t1 to time t2, and the profit CLG that would be obtained per unit time under normal operation is not obtained, so the cumulative operation profit value does not increase. It can be seen that after the equipment is restored at time t2, the cumulative operation profit value increases in proportion to the time.

[0058] In addition, the second cumulative operating revenue value time change 602b when equipment breaks down shows an example where the repair cost 404 is lower and the repair period 405 is longer than the first cumulative operating revenue value time change 602a when equipment breaks down, in which the failure occurs at time t1 and the equipment is restored at time t2'.

[0059] 6, when the equipment breaks down, a comparison of the first cumulative operation profit value time change 602a and the second cumulative operation profit value time change 602b indicates that repair method a, which has a large cumulative operation profit value at time t, is the most desirable maintenance option. In this case, the display step can display the repair method with the lowest cost at the evaluation timing.

[0060] 6, a comparison of the first cumulative operation profit time change 602a when equipment breaks down with the time change 601 of the cumulative operation profit when performing time-based maintenance reveals that the cumulative operation profit at time t is greater in the first cumulative operation profit time change 602a when equipment breaks down, and that the operation profit of corrective maintenance, which performs maintenance after a breakdown, is higher than that of time-based maintenance, which performs regular inspections. Therefore, it is assumed that selecting maintenance that involves repair method a after this breakdown is the most appropriate.

[0061] Therefore, it is desirable to further execute a selection step in which the maintenance that is the least expensive repair at the evaluation timing is selected as the maintenance. In this selection step, the maintenance can be selected by an optimization method with cost reduction as the objective function.

[0062] In this way, in the cost calculation process P5 shown in this embodiment, by evaluating the maintenance cost based on the repair period 405 and the profit that can be obtained per unit time under normal operating conditions, it is possible to obtain information for performing maintenance such as inspection, servicing, repair, and replacement of the equipment that constitutes the maintenance target at an appropriate time taking into account profits.

[0063] Next, the effects of this embodiment will be described.

[0064] The method for supporting the maintenance of the maintenance object 107 consisting of a plurality of devices in this embodiment described above includes an input step (input procedure) for inputting the repair period required for repairing the devices that make up the maintenance object 107, a prediction step (prediction procedure) for predicting the probability of damage occurring based on the failure mode of the devices, an estimation step (estimation procedure) for estimating the risk of whether or not the operation of the maintenance object 107 will be affected using the damage occurrence probability, and a cost calculation step (cost calculation procedure) for calculating the cost using the repair period and the risk.

[0065] In addition, the maintenance support device 101 that supports the maintenance of a maintenance object 107 consisting of multiple devices includes an input unit that inputs the repair period required to repair the devices that make up the maintenance object 107, a failure probability estimation unit 112 that predicts the probability of damage occurring based on the failure mode of the devices, a risk calculation unit 113 that estimates the risk of whether the operation of the maintenance object 107 will be disrupted using the damage occurrence probability, and a cost calculation unit 114 that calculates the cost using the repair period and risk.

[0066] With this configuration, when performing maintenance on the equipment that constitutes the maintenance target 107, it is possible to provide information for performing maintenance such as inspection, maintenance, repair, and replacement of the equipment that constitutes the maintenance target at a more appropriate time, taking into account the profits that can be obtained from the operation of the maintenance target.

[0067] The maintenance support method, program, and maintenance support device 101 of the present invention are particularly effective in systems with a robust configuration in which it is important to maintain operation so that the system can operate at its rated output or reduced output even if some of the equipment constituting the system fails.

[0068] Furthermore, in the cost calculation step, the cost is calculated by using risk to add up the loss caused by the maintenance target 107 not being able to operate during the repair period and the repair costs of the damaged equipment, thereby enabling maintenance work to be performed with even less loss due to maintenance of complex systems.

[0069] Furthermore, by further including a selection step of selecting the repair with the lowest cost at the time of evaluation, the most economically rational repair is selected.

[0070] Furthermore, in the selection step, repairs are selected using an optimization method with cost reduction as the objective function, thereby enabling the most suitable repairs to be selected quickly.

[0071] Furthermore, by further including a display step for displaying a graph with the cost calculated in the cost calculation step on the vertical axis and the time period on the horizontal axis, the maintenance worker can obtain information such as which repairs should be performed at what timing, which can greatly contribute to performing more appropriate maintenance at more appropriate times.

[0072] Furthermore, by further including a display step of displaying the repair method with the lowest cost at the time of evaluation, the maintenance worker can grasp at a glance the maintenance work that should be adopted.

[0073] <Other> It should be noted that the present invention is not limited to the above-described embodiment, and includes various modifications. The above-described embodiment has been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to an embodiment having all of the described configurations.

[0074] For example, in the fault tree 300 in Fig. 4, the judgment condition is operation shutdown 301, but it can also be applied to cases where output is adjusted as an operating state, not just operation shutdown. If output adjustment as an operating state is used as an evaluation condition for the fault tree, it becomes possible to evaluate the cost of maintenance in an operating state with output adjusted and to perform maintenance in the operating state of the maintenance target based on that evaluation.

[0075] 5 and 6, the cumulative operating revenue increases in proportion to time assuming that the maintenance target is operating normally after the equipment is restored, but the normal operating state is not limited to rated output, and may be an operating state with adjusted output. When an operating state with adjusted output is considered in this embodiment, the operating information 121 is updated as needed based on data acquired by the control device 105 and the sensor 106, and the process shown in FIG. 2 is executed based on the updated operating information 121, making it possible to formulate an appropriate maintenance plan taking into account changes in the state of the maintenance target during and after operation.

[0076] It is also possible to add the history of maintenance support evaluation as a database 120. By inputting the history of maintenance support evaluation into the result output unit 115, it becomes possible to compare it with the evaluation results, and it becomes possible to formulate a more appropriate maintenance plan. [Explanation of symbols]

[0077] 101...Maintenance support device 102...input device 103...Display device 104…Network 105...Control device 106...Sensor 107...Maintenance target 110...Arithmetic section 111...Load estimation section 112...Failure probability estimation unit (prediction unit) 113...Risk calculation unit (estimation unit) 114...Cost Calculation Section 115...Result output section 120...Database 121...Operating information 122...System configuration information 123...Power generation cost information 124…Device information 130... Processing section 140…Communications Department 150…Input / output section 300…Fault Tree 301...Out of service 310...Loss of Function A 311…Device A failure 312…Equipment B failure 320…Loss of function B 321…Equipment C failure 330…Loss of function N 401…Device name 402...Part name 403...Failure Mode 404...Repair costs 405...Repair period 501...Time change 502...Time change 601...Time change 602a…First operating revenue cumulative value time change 602b…Change in second operating revenue cumulative value over time 3111...Part A malfunction 3112…Part B damaged P1...Maintenance condition input process P2: Load estimation process P3: Failure probability estimation process P4: Risk calculation process P5…Cost calculation process P6: Result output process

Claims

1. A method for supporting maintenance of a maintenance target consisting of a plurality of devices, an input step of inputting a repair period required for repairing the devices constituting the maintenance target; a prediction step of predicting the probability of damage occurring based on the failure mode of the equipment; an estimation step of estimating a risk of whether or not a problem will occur in the operation of the maintenance target using the probability predicted in the prediction step; a cost calculation step of calculating a cost using the repair period and the risk. Maintenance support method.

2. The maintenance support method according to claim 1, In the cost calculation step, the cost is calculated by adding together the loss due to the inability of the maintenance target to operate during the repair period using the risk and the repair cost of the damaged equipment. Maintenance support method.

3. 3. The maintenance support method according to claim 2, The method further includes a selection step of selecting the repair with the lowest cost at the evaluation timing. Maintenance support method.

4. 4. The maintenance support method according to claim 3, In the selection step, the repair is selected by an optimization method with the reduction of the cost as an objective function. Maintenance support method.

5. The maintenance support method according to claim 1, The method further includes a display step of displaying a graph with the cost calculated in the cost calculation step as the vertical axis and the repair period as the horizontal axis. Maintenance support method.

6. 3. The maintenance support method according to claim 2, The method further includes a display step of displaying the repair method with the lowest cost at the time of evaluation. Maintenance support method.

7. A maintenance support device that supports maintenance of a maintenance target that is composed of a plurality of devices, an input unit for inputting a repair period required for repairing the devices constituting the maintenance target; a prediction unit that predicts the probability of damage occurring based on the failure mode of the equipment; an estimation unit that estimates a risk of whether or not a problem will occur in the operation of the maintenance target using the probability predicted by the prediction unit; a cost calculation unit that calculates a cost using the repair period and the risk. Maintenance support equipment.

8. A program for supporting maintenance of a maintenance target consisting of a plurality of devices, an input procedure for inputting a repair period for repairing the devices constituting the maintenance target; a prediction step for predicting the probability of damage occurring based on the failure modes of the equipment; an estimation step of estimating a risk of whether or not an interruption will occur in the operation of the maintenance target using the probability predicted in the prediction step; a cost calculation procedure for calculating a cost using the repair period and the risk; program.

Images