JP7239409B2 - Maintenance planning system and maintenance planning method - Google Patents

Description

The present invention relates to a maintenance planning system and a maintenance planning method.

There are two forms of preventive maintenance: Time Based Maintenance (TBM) and Condition Based Maintenance (CBM). Due to the recent miniaturization of measurement sensors and the evolution of edge devices, the ratio of CBM is decreasing. increasing. An example of a CBM-based maintenance system is, for example, in the field of railway vehicle maintenance, see Patent Document 1). Patent Literature 1 describes a system that collects and analyzes sensor data or control command values of railway vehicles and determines signs of abnormality of the railway vehicles.

JP 2013-107417 A

However, in the conventional technology such as Patent Document 1, there is a problem that it is difficult to achieve both reliability of maintenance and reduction of manual work time in maintenance planning in which TBM and CBM are mixed. The reason is that the change in reliability of the state recognition system in CBM is not considered. As an example of reliability change, for example, a case can be considered in which the sensor mounting position changes due to vibration during operation, and the quality of sensor data deteriorates as the traveling distance increases. If status recognition is performed based on poor-quality data, the possibility of predicting that something in a normal state will fail soon, or conversely predicting something in a state that is likely to fail soon will increase. As a result, there arises a problem that the reliability of maintenance by CBM is lost.

As a countermeasure for this, it is conceivable that, for example, the parts to be maintained by CBM should also be periodically checked by a human being by synchronizing with the maintenance timing of other parts to be carried out by TBM. However, this method is synonymous with performing TBM maintenance after all, and cannot fully enjoy the merits of CBM such as reduction of manual maintenance opportunities.

One aspect of the present invention aims to achieve both maintenance of reliability of maintenance work and reduction of manual work time in maintenance planning in which TBM and CBM are mixed.

A maintenance planning system according to one aspect of the present invention provides a maintenance target based on state information indicating the state of the maintenance target obtained from the maintenance target and the reliability of maintenance work for the maintenance target. A reliability calculation unit that outputs a maintenance plan that satisfies the reliability threshold set by the user from among the maintenance plans to be performed as a maintenance plan candidate for the maintenance object, and based on the work hours of the worker for the maintenance object and a work time calculation unit that outputs, from among the maintenance plan candidates for the maintenance target, a maintenance plan candidate that satisfies the work time threshold set by the user as a maintenance plan to be presented to the user. Configured as a maintenance planning system.

ADVANTAGE OF THE INVENTION According to one aspect of the present invention, it is possible to achieve both maintenance of reliability of maintenance work and reduction of manual work time in maintenance planning in which TBM and CBM are mixed.

1 is a diagram showing a configuration of Example 1; FIG. It is a figure which shows the vehicle information stored in the maintenance information database. It is a figure which shows the worker information stored in the maintenance information database. FIG. 4 is a diagram showing a processing flowchart of the first embodiment; FIG. 10 is a diagram showing the configuration of Example 2; FIG. 10 is a diagram showing a processing flowchart of the second embodiment;

Embodiments of the present invention will be described below with reference to the drawings. The following description and drawings are examples for explaining the present invention, and are appropriately omitted and simplified for clarity of explanation. The present invention can also be implemented in various other forms. Unless otherwise specified, each component may be singular or plural.

The position, size, shape, range, etc. of each component shown in the drawings may not represent the actual position, size, shape, range, etc., in order to facilitate understanding of the invention. As such, the present invention is not necessarily limited to the locations, sizes, shapes, extents, etc., disclosed in the drawings.

In the following description, various types of information may be described using expressions such as “table” and “list”, but various types of information may be expressed in data structures other than these. "XX table", "XX list", etc. are sometimes referred to as "XX information" to indicate that they do not depend on the data structure. When describing identification information, expressions such as “identification information”, “identifier”, “name”, “ID”, and “number” are used, but these can be replaced with each other.

When there are a plurality of components having the same or similar functions, they may be described with the same reference numerals and different suffixes. However, if there is no need to distinguish between these multiple constituent elements, the subscripts may be omitted in the description.

Also, in the following description, there are cases where processing performed by executing a program is described, but the program is executed by a processor (for example, CPU, GPU) to appropriately perform the specified processing using storage resources ( For example, a memory) and/or an interface device (for example, a communication port) or the like is used, so processing may be performed by a processor. Similarly, a main body of processing executed by executing a program may be a controller having a processor, a device, a system, a computer, or a node. The subject of the processing performed by executing the program may be an arithmetic unit, and may include a dedicated circuit (for example, FPGA or ASIC) that performs specific processing.

A program may be installed on a device, such as a computer, from a program source. The program source may be, for example, a program distribution server or a computer-readable storage medium. When the program source is a program distribution server, the program distribution server may include a processor and storage resources for storing the distribution target program, and the processor of the program distribution server may distribute the distribution target program to other computers. Also, in the following description, two or more programs may be implemented as one program, and one program may be implemented as two or more programs.

In this embodiment, as a specific field, maintenance planning for railroad vehicles will be described.

(Example 1)
In this embodiment, as an example of a maintenance planning system, a user defines a constraint value of the reliability of maintenance work and a constraint value of a work time, and the user defines the constraint value of the reliability and the work time of the maintenance work. An example of creating a maintenance plan will be described.

FIG. 1 is a diagram showing a configuration example of a maintenance planning system 1000 used in this embodiment. As shown in FIG. 1, the maintenance planning system 1000 of the present embodiment includes a reliability constraint input unit 10, an equipment state recognition system 11, a maintenance information database 12, a display unit 13, a work time constraint input unit 14, a planning unit 20 is configured with Each block will be described below.

The planning section 20 used in the maintenance planning system 1000 is configured by, for example, a general information processing device such as a PC (Personal Computer) or a server as hardware. For example, a CPU (Central Processing Unit) reads and executes a program from a ROM (Read Only Memory), thereby implementing the functions of the planning section 20 . The program may be read from a storage medium such as a USB (Universal Serial Bus) memory, or may be provided by being downloaded from another computer via a network. In this embodiment, the display unit 13 is provided outside the planning unit 20 , but the planning unit 20 may have the display unit 13 .

The reliability constraint input unit 10 receives an input of an allowable threshold of reliability estimated in various maintenance works from the user. The reliability of maintenance work is a value defined in the range of 0 to 1, for example. The reliability of manual work (TBM) is set to 1, and relative reliability is given to maintenance work by CBM based on this. The allowable threshold is applied to this reliability, and the CBM recognition results can be trusted for maintenance work items whose reliability exceeds the allowable threshold, but items whose reliability is lower than the allowable threshold A maintenance plan is drawn up for manual checking. The reliability constraint input unit 10 sends the allowable reliability threshold to the reliability calculation unit 201 .

The device state recognition system 11 recognizes the state of the maintenance target device from various sensor data. A plurality of device state recognition systems 11 may be provided. The equipment status recognition system 11 sends the status recognition result of each maintenance target equipment, for example, a binary value of normal or abnormal, to the reliability calculation unit 201 .

The maintenance information database 12 holds vehicle information 1201 as shown in FIG. 2 and worker information 1202 as shown in FIG. Vehicle information 1201 in FIG. 2 exists for each vehicle to be maintained. The vehicle information includes, for example, maintenance work items for the vehicle, the maintenance type for each maintenance work item, the importance of the equipment subject to the maintenance work, and the vehicle condition such as the mileage since the previous manual maintenance work. information that contains

Either TBM or CBM value is set in the maintenance form for each maintenance work item. recognition based on the output value from the recognition system 11).

For the importance of the target equipment, for example, the engine and pantograph are of high importance, so a higher value than other equipment is set, and the fluorescent lights inside the car, the seats are torn and dirty, etc. are relatively less important. Therefore, a smaller value than other facilities is set. Thus, the importance of target equipment is a value set for each equipment. This value may be set for each vehicle depot, or may be collectively set from a host system.

The vehicle state is a parameter that has the effect of lowering the reliability the longer it has been since the previous manual operation. The progress from the previous manual operation is, for example, the travel distance in FIG. When calculating the vehicle state value from the mileage value, first, a reference value of the mileage is determined. Then, a value is obtained by applying a conversion formula in which the vehicle state value decreases from the initial value 1 as the actual traveled distance approaches the reference value. It should be noted that instead of the mileage, the elapsed time from the previous manual operation may simply be substituted. In any case, the vehicle state gradually decreases from the initial value 1, but is reset to the initial value 1 when manual maintenance is performed.

In FIG. 2, there are three types of maintenance work, maintenance work 1 to maintenance work 3, to be performed on a certain vehicle A. For example, in maintenance work 1, a maintenance point is confirmed by TBM and is an important maintenance work. It indicates that the item importance is set as "1.0". It also shows that the vehicle A has traveled a distance of 1000 km since the previous maintenance work 1 was performed. These pieces of information are used in the reliability calculation unit 201 and the work time calculation unit 202 .

The display unit 13 is a display device such as an LCD (Liquid Crystal Display), for example, and displays the maintenance plan calculated by the work time calculation unit 202 to present it to the user. As a presentation method, in addition to display on a display, a paper medium output by a printing device such as a printer may be used.

The work time constraint input unit 14 receives from the user an input of an allowable threshold for the required work time estimated for various types of maintenance work. The input information includes, for example, two values indicating whether or not to apply the work time constraint, and the actual constraint value when applied. The work time constraint input unit 14 sends these two pieces of information to the work time calculation unit 202 .

The planning section 20 is configured by having a reliability calculation section 201 and a work time calculation section 202 . Each block constituting the planning unit 20 will be described below.

The reliability calculation unit 201 receives the state recognition result of the CBM implementation target received from the equipment state recognition system 11, the reliability tolerance threshold received from the reliability constraint input unit 10, and the From the vehicle information 1201, maintenance plan candidates under reliability constraints are calculated. First, as a major premise, the reliability calculation unit 201 determines that, among the maintenance items for which CBM is to be performed, if the state recognition result is not normal, the maintenance is always performed manually. The reliability calculation unit 201 calculates whether or not the reliability estimated for each maintenance work item exceeds the allowable threshold value for the status recognition result is normal, and creates a maintenance plan candidate.

As a specific example, when the reliability calculation unit 201 determines that there are n maintenance work items to be subjected to CBM whose reliability exceeds the threshold, (1) the recognition result of CBM is relied upon It is determined that two patterns, ie, no work or (2) determination to manually check, can be selected for each of the above n work items, and a total of ²ⁿ maintenance plan candidates are created. An example of reliability calculation will be described later with reference to the processing flowchart of FIG. The point of this process is to model the reliability change of CBM using the information of each maintenance work item. It can be selected optimally from the point of view. The information of each maintenance work item is specifically information such as the degree of importance of the target facility of each maintenance work stored in the maintenance information database 12 and the vehicle condition. The reliability calculation unit 201 sends the calculated maintenance plan candidate to the work time calculation unit 202 .

The work time calculation unit 202 receives maintenance plan candidates from the reliability calculation unit 201 . 3 from the maintenance information database 12, and receives information on the allowable threshold for the required work time from the work time constraint input unit 14. FIG. The worker information 1202 is information for managing the skill level of workers for each maintenance work. In FIG. 3, for example, the standard time for maintenance work 1 is "30 minutes", but the skill level of worker A and worker C is set to an index "1.0" indicating that the work is standard. This indicates that the skill level of member B is set to an index of "1.1", which indicates that the skill level is higher than the standard.

Based on the information, the work time calculation unit 202 calculates the estimated work time of each maintenance plan candidate, and displays the best maintenance plan that satisfies the allowable threshold of the required work time as the final maintenance plan on the display unit 13. send. A specific calculation example will be described later in the processing flowchart of FIG.

FIG. 4 is a processing flowchart in this embodiment. Each block in the flowchart is described below. First, in this system, the reliability constraint input unit 10 receives an input of a reliability constraint (reliability threshold) from the user (S10). The input value may be either a single value that is uniformly applied to all maintenance targets, or a plurality of values that are set for each maintenance target.

Next, the work time constraint input unit 14 receives an input of a work time constraint (work time threshold) from the user in the same manner as the reliability constraint (S10). As described above, the input information includes, for example, a binary value indicating whether or not to apply the work time constraint, and the actual constraint value when applied. If there is no work time input, the planning unit 20 determines that the work time constraint is not applied, and sends information to the work time calculation unit 202 indicating that the work time constraint is not applied.

Next, the reliability calculation unit 201 narrows down maintenance plan candidates (S12). First, the reliability calculation unit 201 estimates the reliability of each maintenance work item. Let I be a set of all maintenance target vehicles, iεI be each maintenance target vehicle, J be a set of all maintenance work items, and jεJ be a symbol representing each maintenance work item. At that time, based on the importance _ij of each maintenance work item of each vehicle and the vehicle state _i stored in the maintenance database 12, the reliability _ij of each maintenance target item of each vehicle is given by the following equation (1).

(Formula 1) If: Maintenance work item is subject to TBM
Then: _{Confidence_ij} = 1 Else:
If: Status recognition result of maintenance work item is normal
Then: _{Reliability_ij} = vehicle condition _i - importance of maintenance _{work_ij}
Else:
Then: _{Reliability_ij} =0

As described above, the vehicle state _i is actually a value converted from travel distance information or the like. Taking the conversion in FIG. 2 as an example, a reference value _i of the mileage is defined for each vehicle, and the closer the mileage _ij from the previous manual maintenance work to the reference value _i , the more the converted value is. Apply a conversion formula that decreases from the initial value of 1. Equation 2 is given as an example of such a conversion formula.
(Formula 2) Vehicle state _i = 1 - (distance traveled since previous manual maintenance work) _{_ij} /(reference value of traveled distance) _{_i}

Next, the reliability calculation unit 201 applies the reliability threshold received in S10 to the reliability _ij calculated based on Equation (1). Then, a judgment is obtained as to whether the threshold is exceeded or fallen below for each maintenance work item _ij . Since the TBM implementation target always has a reliability of 1, the main selection target is the CBM implementation target item. The reliability calculation unit 201 always sets the reliability to 0 for those whose state recognition results are not normal among the CBM implementation targets, so that they are always assigned to manual work. When the reliability calculation unit 201 determines that the reliability _ij of the CBM target item exceeds the threshold, the work time calculation unit 202 makes a final judgment as to whether to trust the result of CBM or perform it manually. This is done in the work time calculation S13. The reliability calculation unit 201 creates a maintenance plan candidate as information for that purpose. As described above, the maintenance plan candidate is, if there are n maintenance work items for CBM implementation whose reliability exceeds the threshold, the item is (1) manually implemented or (2) the result of CBM It is a maintenance plan list of a total of ²ⁿ patterns covering two cases of trusting.

Next, the work time calculation unit 202 extracts maintenance plan candidates that satisfy the work time constraint from among the maintenance plan candidates calculated by the reliability calculation unit 201, and narrows down the candidates (S13). First, the work time calculator 202 estimates the work time for each maintenance work item. I is a set of all maintenance target vehicles, i∈I is each maintenance target vehicle, J is a set of all maintenance work items, j∈J is each maintenance work item, K is a set of all workers, and k∈K is each work. Introduced as a symbol representing a member. At this time, the work time _ij of each maintenance work item is estimated by the following equation 3 based on the standard work time _ij of each maintenance work item stored in the maintenance information database 12 and the worker's skill level _ijk . If the worker skill level _ijk has a value of 1.0, it means that the work can be completed within the standard work time. If it is lower than 1.0, it indicates that the work can be completed in a longer working time.
(Formula 3) work time _ij = standard work time_ij/ _worker skill _{level_ijk}

Here, it is necessary to allocate workers so that the total work time is minimized for each maintenance plan candidate, and an algorithm that solves an optimization problem such as linear programming is applied to this problem. When this calculation is completed, one worker assignment information and one working time are determined for each maintenance plan candidate. The work time calculation unit 202 applies the constraint information (work time threshold value) input in the work time constraint input (S11) to these work times to narrow down the final maintenance plan. If the work time calculation unit 202 determines that the constraint information input in the work time constraint input (S11) is "apply work time constraint: not applicable" or that there is no input itself, the work The one with the shortest time is taken as the final maintenance plan proposal. Similarly, when the work time calculation unit 202 determines that the work time threshold information has been given as “apply work time constraint: yes”, the work time calculation unit 202 selects the most The one with the highest reliability will be the final maintenance plan proposal. The work time calculation unit 202 outputs the final maintenance plan to the display unit 13 and presents it to the user (S14).

According to this embodiment configured as described above, based on the constraints on maintenance work reliability and maintenance work time input by the user, whether each work item is to be performed by TBM or CBM, and which worker can be assigned to which task. As a result, even in maintenance work in which TBM and CBM are mixed, it is possible to provide a maintenance work plan that achieves both reliability and work time.

That is, the reliability calculation unit 201 obtains state information (for example, various sensor data) indicating the state of the maintenance target from the maintenance target device via the device state recognition system 11, and Based on the reliability of the maintenance work, the maintenance plan that satisfies the allowable reliability threshold (reliability constraint), which is the reliability threshold set by the user, is selected from the maintenance plans to be performed for the maintenance target. based on the worker's work time for the maintenance target, the work time calculation unit 202 selects the work time threshold (work time constraint ) is output as a maintenance plan to be presented to the user. Therefore, in maintenance plan formulation in which TBM and CBM are mixed, maintenance of reliability of maintenance work and reduction of manual work time can be achieved at the same time.

Further, the reliability calculation unit 201 estimates the reliability based on the state information obtained from the maintenance target and the importance of the maintenance work, and the estimated reliability satisfies the reliability threshold. is output as a maintenance plan candidate for maintenance, it is possible to output a maintenance plan candidate that satisfies the reliability threshold while considering the importance of the maintenance work.

Further, the reliability calculation unit 201 determines that a maintenance plan whose estimated reliability satisfies the threshold of reliability is maintenance work by CBM, narrows down maintenance plan candidates for maintenance, and determines that the estimated reliability is A maintenance plan that does not satisfy the reliability threshold is determined to be maintenance work by TBM and is not considered as a maintenance plan candidate for maintenance. Maintenance plans excluding work can be output as candidates.

Further, the work time calculation unit 202 estimates the work time based on the standard work time set for each maintenance work and the worker skill level, which is the skill level of the worker. Since the maintenance plan candidate satisfying the time threshold is output as the maintenance plan to be presented to the user, it is possible to output the maintenance plan candidate satisfying the reliability threshold while considering the worker's skill level.

In this embodiment, maintenance planning for railway vehicles was described as a specific field of application, but the field of application of this embodiment is not limited as long as the maintenance involves both TBM and CBM. For example, in the case of vehicles such as buses and trucks, or aircraft and ships, the vehicle information in the maintenance information database 12 may be replaced with vehicle information in each field. Also, in the field of building equipment and elevators, for example, it is possible to replace the information on the mileage in the vehicle information of the maintenance information database 12 with alternative information such as operating hours.

(Example 2)
In the present embodiment, as an example of a maintenance planning system, an example will be described in which when an inquiry is received from an operation information system as to whether or not a replacement vehicle can be prepared in an emergency, the availability is automatically answered. This occurs when a sudden accident occurs and a substitute vehicle is required. First, an inquiry is received from the operation management system as to whether or not the vehicle in the depot for maintenance will be ready for operation after, for example, X hours. On the other hand, the maintenance manager needs to determine whether or not the maintenance work will be done in time for X hours. In the present embodiment, this inquiry is regarded as a time constraint, and it is possible to respond to the inquiry about operation management based on the maintenance plan drawn up while making full use of TBM and CBM.

FIG. 5 is a diagram showing a configuration example of a maintenance planning system 2000 used in this embodiment. As shown in FIG. 5, the maintenance planning system 2000 of this embodiment does not have the display unit 13 from the configuration example of the first embodiment, and has a configuration in which the operation information system 15 and the determination unit 203 are added. It is different from the maintenance planning system 1000 in the first embodiment in that the Also, the destination of the information of the equipment status recognition system is changed from the reliability calculation unit 201 to the work time calculation unit 202 .

The operation information system 15 sends the work time constraint information to the work time calculation unit 202 . Specifically, it is information that "work time constraint is applied: allowed" and that the threshold for work time is X hours. Finally, it receives the information on whether or not the execution is possible, which is output from the determination unit 203 .

After the maintenance plan candidates are narrowed down by the work time calculation unit 202 and the reliability calculation unit 201, the determination unit 203 sends the result to the operation information system 15 if even one maintenance plan candidate that satisfies the constraints remains. , if there is not even one left, the result is sent. In the configuration of FIG. 5, the result is sent directly to the operation information system 15, but it is also possible to adopt a system in which a human judges the final approval or disapproval via the display unit 13 and sends it.

FIG. 6 is a flow chart of maintenance planning in this embodiment. A major difference from the first embodiment is that the maintenance plan candidates are narrowed down from the work time calculation. This is different from the first embodiment in which at least one maintenance plan candidate that satisfies the reliability constraint always exists (the reliability constraint is inevitably satisfied if everything is performed manually). This is because there may not be even one maintenance plan candidate that satisfies the requirements. In that case, since the result is determined at the stage when the work time calculation is completed, the reliability calculation can be omitted with this configuration. Each block in the flowchart is described below.

First, in this system, the work time calculator 202 receives information on work time constraints from the operation information system 15 (S20). Next, the reliability constraint input unit 10 receives the user's reliability constraint input value (S21). As was the work time constraint in the first embodiment, the input of the reliability constraint is not essential in the second embodiment. However, it is considered that there may be cases where it is necessary to accept input, and as input information in consideration of such a case, the reliability constraint input unit 10 may, for example, provide a binary value indicating whether or not to apply the reliability constraint, and the case of applying receive the actual threshold for

Next, the working time calculator 202 narrows down maintenance plan candidates that satisfy the working time constraint (S22). A specific calculation is the same as in the case of the first embodiment. First, the work time calculation unit 202 always assigns to manual work those items for which the state recognition result is not normal among the CBM execution target items. After that, the work time calculation unit 202 creates ²ⁿ maintenance plan candidates when there are n maintenance target items to be subjected to CBM. The work time calculation unit 202 calculates the allocation of workers with the shortest work time in each maintenance plan candidate and the total work time, and extracts the maintenance plan candidate whose work time is less than the threshold of the work time constraint. do.

Next, the work time calculation unit 202 performs conditional branching according to the number of extracted maintenance plan candidates (S23). If the work time calculation unit 202 determines that there is not even one extracted maintenance plan candidate (S23; No), it sends information indicating that the number of maintenance plan candidates is 0 to the determination unit 203, and shifts the process to S25. On the other hand, when it is determined that there is one or more maintenance plan candidates (S 23 ; Yes), the work time calculation unit 202 sends information on the maintenance plan candidates to the reliability calculation unit 201 . Then, the reliability calculation unit 201 narrows down the candidates from the viewpoint of reliability (S24). As described above, the reliability constraint input unit 10 provides two pieces of information: (1) information on whether or not the application is permitted, and (2) the threshold value for the case of evaluation. If (1) is negative, the reliability calculation unit 201 selects the maintenance plan candidate with the highest reliability as the final maintenance plan, and sends the information to the determination unit 203 . If (1) is possible, the reliability calculation unit 201 selects the one that satisfies the reliability threshold and requires the shortest work time as the final maintenance plan, and sends the information to the determination unit 203 . If (1) is possible but there is no one that satisfies the reliability threshold, the reliability calculation unit 201 sends information indicating that the number of maintenance plan candidates is 0 to the determination unit 203 .

Finally, the determination unit 203 sends a yes reply to the operation information system 15 if there is a received maintenance plan proposal, and sends a negative reply if information on the maintenance plan candidate count of 0 has been received (S25). ).

According to this embodiment configured in this way, based on the work time constraints and user input reliability constraints received from the operation information system, the best maintenance plan that satisfies the constraints exists or if it exists It is possible to calculate concretely what kind of conservation plan it is. As a result, it is possible to respond to an urgent inquiry from the operation information system as to whether or not a replacement vehicle is ready based on the maintenance plan drawn up while making full use of the TBM and CBM.

In this embodiment, maintenance planning for railway vehicles was described as a specific field of application, but the field of application of this embodiment is not limited as long as the maintenance involves both TBM and CBM. For example, it is possible to replace the operation information system 15 with a similar system existing in each field, and replace the vehicle information in the maintenance information database 12 with information suitable for each field, as in the case of the first embodiment.

As described above in each embodiment, according to this system, in a maintenance mode in which TBM and CBM are mixed, the best maintenance plan is drawn up under the two constraints of maintenance work reliability and human work time. be able to. Specifically, it is possible to create a plan that requires as little manual labor as possible while keeping the reliability of maintenance work above a certain level, or to create a plan that has the best reliability under the presented work time constraints.

1000, 2000 maintenance planning system 10 reliability constraint input unit 11 equipment state recognition system 12 maintenance information database 13 display unit 14 work time constraint input unit 15 operation information system 20 plan planning unit 201 reliability calculation unit 202 work time calculation unit 203 Judging part

Claims (8)

The reliability set by the user from among the maintenance plans to be performed for the maintenance target based on the state information indicating the state of the maintenance target obtained from the maintenance target and the reliability of the maintenance work for the maintenance target. a reliability calculation unit that outputs a maintenance plan that satisfies a degree threshold as a maintenance plan candidate for the maintenance target;
A task of outputting, as a maintenance plan to be presented to a user, a maintenance plan candidate that satisfies the work time threshold set by the user from among the maintenance plan candidates for the maintenance target, based on the work hours of the worker for the maintenance target. a time calculation unit;
A maintenance planning system characterized by comprising: The maintenance planning system according to claim 1,
The reliability calculation unit estimates the reliability based on the state information obtained from the maintenance object and the importance of the maintenance work, and the estimated reliability satisfies a threshold of the reliability. outputting the maintenance plan as a maintenance plan candidate for the maintenance target;
A maintenance planning system characterized by: The maintenance planning system according to claim 2,
The reliability calculation unit determines that a maintenance plan satisfying the threshold of the reliability in which the estimated reliability is satisfied is maintenance work by CBM (Condition Based Maintenance), and narrows down the maintenance plan candidates for the maintenance target, A maintenance plan in which the estimated reliability does not satisfy the reliability threshold is determined to be maintenance work by TBM (Time Based Maintenance), and is not used as a maintenance plan candidate for the maintenance target;
A maintenance planning system characterized by: The maintenance planning system according to claim 1,
The work time calculation unit estimates the work time based on the standard work time set for each maintenance work and the skill level of the worker, and the estimated work time is used to set the threshold of the work time. Output the satisfying maintenance plan candidate as a maintenance plan to be presented to the user.
A maintenance planning system characterized by: A reliability calculation unit selects a maintenance plan to be performed for the maintenance object based on status information indicating the state of the maintenance object obtained from the maintenance object and the reliability of maintenance work for the maintenance object. outputting a maintenance plan that satisfies the reliability threshold set by the user as a maintenance plan candidate for the maintenance target;
A work time calculation unit presents to a user a maintenance plan candidate that satisfies the work time threshold set by the user, from among the maintenance plan candidates for the maintenance object, based on the work time of the worker for the maintenance object. Output as a maintenance plan,
A maintenance planning method characterized by comprising: The maintenance planning method according to claim 5,
The reliability calculation unit estimates the reliability based on the state information obtained from the maintenance object and the importance of the maintenance work, and the estimated reliability satisfies a threshold of the reliability. outputting the maintenance plan as a maintenance plan candidate for the maintenance target;
A maintenance planning method characterized by: The maintenance planning method according to claim 6,
The reliability calculation unit determines that a maintenance plan satisfying the threshold of the reliability with the estimated reliability is maintenance work by CBM, narrows down maintenance plan candidates for the maintenance target, and estimates the reliability determines that a maintenance plan that does not satisfy the reliability threshold is maintenance work by TBM, and does not make it a maintenance plan candidate for the maintenance target;
A maintenance planning method characterized by: The maintenance planning method according to claim 5,
The work time calculation unit estimates the work time based on the standard work time set for each maintenance work and the skill level of the worker, and the estimated work time is used to set the threshold of the work time. Output the satisfying maintenance plan candidate as a maintenance plan to be presented to the user.
A maintenance planning method characterized by:

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