A method for balancing advanced maintenance tasks of high-end equipment based on availability and maintenance cost

Abstract

The present invention relates to the technical field of rail vehicle maintenance task balancing, and in particular to a method for balancing high-end equipment advanced maintenance tasks based on availability and maintenance cost. The present invention adopts engineering analysis and data modeling methods, takes maintenance task process requirements as identification and judgment criteria for balancing, takes maintenance intervals, maintenance man-hours, and maintenance costs as constraints, establishes a task balancing model, arranges equipment rack maintenance items in a balanced manner, obtains task balancing, establishes an economic model based on the balanced task arrangement, obtains economic data of the balanced arrangement plan, and makes a balanced decision with reasonable man-hour distribution and significant economic efficiency through balance and economy, combined with human resources and equipment resources.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicle maintenance task balancing, and in particular to a method for balancing high-end equipment advanced maintenance tasks based on availability and maintenance cost. Background Art

[0002] The maintenance process of rail vehicles is usually divided into routine maintenance and advanced maintenance. In order to reduce the time of advanced maintenance (such as 35 days for frame repair and 45 days for major overhaul) and improve vehicle availability, the method of replacing parts and parallel operations is usually adopted to reduce the advanced maintenance cycle. This method will increase spare parts inventory and labor input, and also places very high demands on the supplier's supply and coordination capabilities, resulting in higher maintenance costs.

[0003] For example, the Chinese invention patent with publication number CN112966842A discloses a method for automatically generating subway vehicle maintenance plans based on time slice segmentation. It is used for production task scheduling, but only considers daily maintenance and balanced repairs, and does not consider the concentration of maintenance items in the frame maintenance plan. There is no discussion on how to shorten the high-level maintenance cycle.

[0004] The Chinese invention patent with publication number CN112561096A discloses a full-life maintenance method for subway vehicle equipment. It does not solve the problem of how to balance advanced maintenance tasks and the problem of heavy workload. The tasks performed during frame maintenance are not identified, and non-essential tasks and frame maintenance tasks are performed during the frame maintenance cycle, resulting in more maintenance tasks during frame maintenance and longer downtime. The formulation of maintenance plans is not based on reliability and economy, resulting in over-repair of equipment and excessive maintenance costs.

[0005] Therefore, in view of the shortcomings of existing technologies, it is necessary to provide a method for balancing advanced maintenance tasks of high-end equipment based on availability and maintenance cost to solve the shortcomings of existing technologies. Summary of the invention

[0006] The purpose of the present invention is to avoid the shortcomings of the prior art and provide a method for balancing the advanced maintenance tasks of high-end equipment based on availability and maintenance cost. The method for balancing the advanced maintenance tasks of high-end equipment based on availability and maintenance cost adopts engineering analysis and data modeling methods, takes the process requirements of the maintenance tasks as the identification and judgment criteria for whether they can be balanced, takes the maintenance intervals, maintenance hours, and maintenance costs as constraints, establishes a task balance model, arranges the equipment rack maintenance items in a balanced manner, obtains the task balance, establishes an economic model based on the balanced task arrangement, obtains the economic data of the balanced arrangement plan, and makes a balanced decision with reasonable labor time distribution and significant economic efficiency through balance and economy, combined with human resources and equipment resources.

[0007] The above-mentioned purpose of the present invention is achieved through the following technical means.

[0008] A method for balancing high-end equipment advanced maintenance tasks based on availability and maintenance cost is provided, comprising the following steps:

[0009] S1. Formulate structured maintenance procedures and itemize maintenance tasks in the structured maintenance procedures;

[0010] S2: Identify the maintenance balancing points, identify the maintenance nature of the maintenance task, and select the maintenance points;

[0011] S3: Task interval balancing analysis, using reliability and economy as constraints to perform data analysis and obtain the balancing period of task intervals;

[0012] S4: Establish a balanced model for maintenance, determine the balanced range, and use the characteristics of maintenance tasks as constraints to obtain a balanced model for maintenance;

[0013] S5: Output the balanced layout plan, analyze the balance and economy of the rack maintenance balanced model, and output the balanced layout plan.

[0014] Specifically, the specific method of step S4 is:

[0015] S41: Inputting the parameters of the balancing model, which include: the time point of the rack repair T0, the balancing period T, the balancing granularity N, and the balancing rack repair time period H. J , Balanced maintenance time period H J The remaining available time in h j , the cost of each repair task C i , vehicle design life L, each frame repair task working hours t i , the working hours used in this time period after balancing W j , the difference between the working hours used in this time period after equalization and the average working hours after equalization of each period T θj And the number of equilibrable items n;

[0016] The working hours used in this time period after balancing

[0017] in is a binary decision variable, indicating whether the Oth task is assigned to the time periods, of which =1 means allocation, =0 means unallocated;

[0018] The difference between the working hours used in this time period after equalization and the average working hours after equalization of each period ;

[0019] S42: Balance range selection, judging whether the total working hours of the balanceable item points exceeds the total available time within the balanceable period. The judgment formula is as follows:

[0020] ;

[0021] when , you can continue to screen the balanced model.

[0022] when When the balancing model screening cannot be continued, increase the balancing period Or reduce the number of equilibria , and obtain the frame repair equilibrium model.

[0023] Preferably, the specific method of step S5 is:

[0024] S51, generating a balancing solution, using the partition method according to the number of balancing items n, the balancing period T and the balancing granularity N, to generate a balancing solution set S;

[0025] The number of calculation schemes using the partition method is k, and the formula is as follows:

[0026]

[0027] S52: Task interval screening, through the input of reliability interval and economic interval of equilibrable item points, the equilibration scheme set S is screened;

[0028] S53: Man-hour screening, screening the man-hours in a single time period and the total man-hours in each time period for the remaining balance solution set screened in step S52;

[0029] S54: Cost analysis: screening the remaining balanced solution set selected in step S53 for the full life cycle maintenance cost, and taking the balanced solution with the minimum full life cycle maintenance cost as the optimal balanced arrangement solution. Sk The formula is as follows:

[0030] ;

[0031] Where T is the balancing period, T0 is the time point for the repair, C i is the cost of each maintenance task, N is the balancing granularity, L is the vehicle design life, j is the sequence number of the balancing range divided into equal parts according to the granularity, is a binary decision variable, indicating the Whether the task is assigned to the Pth time period, =1 means allocation, =0 means unassigned.

[0032] Specifically, the specific method of man-hour screening in step S53 is:

[0033] S531: Single time period working hours screening. The total working hours of tasks balanced within a single time period must meet the remaining available time of the time period. The formula is as follows:

[0034] ;

[0035] Where N is the balancing granularity, n is the number of balancing items, j is the sequence number of the balancing range divided equally according to the granularity, and X OP is a binary decision variable, indicating the Whether the task is assigned to the Pth time period, =1 means allocation, =0 means unallocated;

[0036] S532: The total working hours in each time period are screened, and the difference between the balanced working hours in each time period and the average working hours after the balance is minimized. The formula is as follows:

[0037] ;

[0038] Where N is the equilibrium granularity, It is the difference between the working hours used in this time period after equalization and the average working hours after equalization of each section, and j is the serial number after the equalization range is divided into equal parts according to the granularity.

[0039] Furthermore, the specific method for selecting the repair items in step S2 is:

[0040] S21: Identify the maintenance task level, whether the maintenance task is routine maintenance or advanced maintenance;

[0041] S22: Identify necessary replacement parts, and identify whether the parts involved in the rack repair task are necessary replacement parts;

[0042] S23: Identify the maintenance station and whether it can be repaired in situ;

[0043] S24: Identify the repair method, whether it is self-repair or outsourced repair;

[0044] S25: Input process requirements into the structured maintenance procedure;

[0045] S26: Input spare part type into structured maintenance procedure;

[0046] S27: Identify whether it is covered, identify whether it is covered by daily maintenance;

[0047] S28: Balance analysis to see whether it can be incorporated into daily maintenance.

[0048] Specifically, the specific screening conditions of step S52 are:

[0049] VS1: When the reliability interval is less than the economic interval, only the balanced maintenance time period that is less than the reliability interval can be allocated;

[0050] VS2: When the economic interval left < reliability interval < economic interval right, choose a balanced maintenance time period between reliability and economy left;

[0051] VS3: When the economic interval is less than the reliability interval, select the balanced maintenance time period within the reliability interval.

[0052] The present invention adopts engineering analysis and data modeling methods, takes the process requirements of maintenance tasks as the identification and judgment criteria for whether they can be balanced, takes maintenance intervals, maintenance hours, and maintenance costs as constraints, establishes a task balance model, and evenly arranges the equipment rack maintenance items to obtain task balance. Based on the balanced task arrangement, an economic model is established to obtain the economic data of the balanced arrangement plan. Through balance and economy, combined with human resources and equipment resources, a balanced decision is made with a reasonable distribution of working hours and significant economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0054] Figure 1 The present invention is a flow chart of a method for balancing advanced maintenance tasks of high-end equipment based on availability and maintenance cost.

[0055] Figure 2 It is a flow chart of a frame maintenance balancing model of a maintenance task balancing method for high-end equipment based on availability and maintenance cost according to the present invention.

[0056] Figure 3 It is a task interval balancing analysis schematic diagram of a method for balancing maintenance tasks of high-end equipment based on availability and maintenance cost according to the present invention.

[0057] Figure 4 The present invention is a flowchart of the identification of frame maintenance balancing item points of a maintenance task balancing method for high-end equipment based on availability and maintenance cost.

[0058] Figure 5 is the working hours W used in this time period after balancing according to a method for balancing high-end equipment advanced maintenance tasks based on availability and maintenance cost of the present invention. j Parameter diagram of .

[0059] Figure 6It is the difference between the working hours used in this time period after equalization and the average working hours after equalization of each section in the method for equalizing high-end equipment advanced maintenance tasks based on availability and maintenance cost of the present invention. θj Parameter diagram of . DETAILED DESCRIPTION

[0060] The present invention is further described in conjunction with the following examples.

[0061] Example 1

[0062] like Figure 1-6 As shown, a method for balancing high-end equipment advanced maintenance tasks based on availability and maintenance cost includes the following steps:

[0063] S1. Develop structured maintenance procedures and itemize maintenance tasks in the structured maintenance procedures. The itemization of maintenance procedures facilitates the identification of item points in subsequent steps.

[0064] S2: Identify the maintenance balancing items, identify the maintenance nature of the maintenance task, screen the maintenance items, and further identify the task level, task necessity, maintenance method, process requirements, required spare parts, whether it is outsourced, and whether it is covered by daily maintenance.

[0065] The specific method for selecting the repair items in step S2 is:

[0066] S21: Identify the maintenance task level and whether the maintenance task belongs to routine maintenance or advanced maintenance.

[0067] That is, identify which level the task belongs to. Since the tasks performed during frame maintenance may include daily inspection and balancing maintenance, it is necessary to identify the tasks performed by the frame maintenance and only identify the key items of the maintenance tasks of the frame maintenance to determine whether the item is a unique item for frame maintenance. If "yes", further item screening will be performed, and if "no", no item screening will be performed.

[0068] S22: Identify necessary replacement parts, and identify whether the parts involved in the frame repair task are necessary replacement parts.

[0069] Identify whether the parts involved in the rack repair task are must-replace parts. If they are must-replace parts, list them in the must-replace parts list, and subsequently count the types and quantities of must-replace parts, prepare spare parts in advance to prevent the situation of insufficient spare parts and affect the utilization rate. Determine whether the storage volume of must-replace parts required for the unique items of rack repair meets the maintenance requirements. If "yes", further item selection will be carried out, and if "no", no item selection will be carried out.

[0070] S23: Identify the maintenance station and whether it can be repaired in situ.

[0071] For the maintenance parts involved in the frame repair regulations, based on vehicle maintenance experience, supplier recommendations and manufacturer assessments, whether the parts can be repaired in situ or some parts can be repaired on the ground, saving a lot of maintenance time, and judging whether the repair method for the frame repair-specific items is in situ repair. If "yes", further item screening will be carried out, and if "no", no item screening will be carried out.

[0072] S24: Identify the repair method, whether it is self-repair or outsourced repair. If "yes", further item selection is performed; if "no", no item selection is performed.

[0073] Determine whether the repair level of the special items of the frame repair is independent repair. If "yes", further item screening will be carried out; if "no", no item screening will be carried out.

[0074] S25: Input process requirements into the structured maintenance procedure.

[0075] S26: Input spare part type into structured maintenance procedure.

[0076] The process requirements usually include: lifting the car, disassembling, disassembling and repairing, etc. The process requirements of the task should be identified so that tasks with the same process requirements can be executed simultaneously during the repair, which can shorten the repair time and reduce the number of personnel involved.

[0077] S27: Identify whether it is covered, identify whether it is covered by daily maintenance;

[0078] If “yes”, further item point screening will be performed; if “no”, no item point screening will be performed.

[0079] S28: Balance analysis to see whether it can be incorporated into daily maintenance.

[0080] The following judgments need to be made, including:

[0081] For tasks that require lifting and disassembling vehicles, they are not included in daily maintenance because the maintenance cycle is too long.

[0082] For the task of disassembling and repairing system components, it is necessary to evaluate whether it can be included in daily maintenance based on the actual situation.

[0083] For tasks that require special equipment, such as flaw detection, they are not included in routine maintenance because they require special equipment.

[0084] Replacement tasks are not included in routine maintenance.

[0085] Tasks such as visual inspection, detailed inspection, operational inspection, and functional inspection with a short operation time can be considered as part of daily maintenance. If they exceed 24 hours, they will not be included in daily maintenance.

[0086] Tasks that require outsourcing are not included in routine maintenance.

[0087] S3: Task interval balancing analysis, data analysis is performed with reliability and economy as constraints to obtain the balanced cycle of task intervals. Reliability-centered maintenance, combined with EMU operation and maintenance fault data, maintenance data, and reliability data, identifies component fault information (potential faults, functional faults, shelving, deletion), calculates the effective service mileage of components, conducts data analysis on related fault modes, and constructs reliability models for potential faults and functional faults respectively. The reliability interval is determined based on the acceptable failure rate of the entire life cycle. The maintenance cost and parking time data of preventive repairs and fault repairs are statistically analyzed to calculate the most economical maintenance interval and the maximum availability interval. By weighing the reliability interval, economic interval, and availability interval, the optimal maintenance interval is given by comprehensively considering economy and availability while ensuring the safe operation of the vehicle.

[0088] S4: Establish a maintenance balancing model, determine the balance range, use the maintenance task characteristics as constraints, and obtain the maintenance balancing model. The purpose of the maintenance balancing model is to shorten the maintenance cycle by balancing the maintenance items forward and backward, and seek reasonable working hours and optimal economic efficiency. The maintenance items have working hours attributes and interval attributes. Each maintenance item has corresponding working hours required for completion, and each task must be completed before the reliability interval. First, it is necessary to determine a suitable balance range, and then refine the maintenance task characteristics as constraints to establish a balance model.

[0089] S5: Output the balanced arrangement plan, analyze the balance and economy of the rack and repair balanced model, output the balanced arrangement plan, and output the plan based on the screening of the rack and repair balanced model.

[0090] The specific method of step S4 is:

[0091] S41: Input the parameters of the balancing model, which include: the time point of the frame repair T0 (in years, such as the 5th year), the balancing period T (in years, such as the 4th to 6th year), the balancing granularity N (in segments, the number of time segments for balancing frame repair), and the time segment H for balancing frame repair. J (Unit: month), balanced maintenance time period H J The remaining available time in h j (Unit: hour / segment, determined by the existing equalization repair task man-hours N / A in the equalization repair time period), the cost of each repair task C i (in yuan), vehicle design life L (in years, usually 30 years), man-hours per maintenance task t i (in hours), the working hours used in this time period after balancing W j(in hours), the difference between the working hours used in this time period after equalization and the average working hours after equalization of each period T θj (in hours) and the number of balancing points n (in pieces);

[0092] The working hours used in this time period after balancing ;

[0093] in is a binary decision variable, indicating the Whether the task is assigned to the Pth time period, =1 means allocation, =0 means unallocated;

[0094] The difference between the working hours used in this time period after equalization and the average working hours after equalization of each period ;

[0095] S42: Balance range selection, judging whether the total working hours of the balanceable item points exceeds the total available time within the balanceable period. The judgment formula is as follows:

[0096] ;

[0097] when , you can continue to screen the balanced model.

[0098] when When the balancing model screening cannot be continued, increase the balancing period Or reduce the number of equilibria , and obtain the frame repair equilibrium model.

[0099] The specific method of step S5 is:

[0100] S51, generating a balancing solution, using the partition method according to the number of balancing item points n, the balancing period T and the balancing granularity N, to generate a balancing solution set S.

[0101] The number of calculation schemes using the partition method is k, and the formula is as follows:

[0102] ;

[0103] The equilibrium solution set S is as follows:

[0104]

[0105] S52: Task interval screening: by inputting the reliability interval and economic interval of the balancing item points, the balancing solution set S is screened.

[0106] The specific screening conditions of step S52 are:

[0107] VS1: When the reliability interval is less than the economic interval, only the balanced maintenance time period that is less than the reliability interval can be allocated;

[0108] VS2: When the economic interval left < reliability interval < economic interval right, choose a balanced maintenance time period between reliability and economy left;

[0109] VS3: When the economic interval is less than the reliability interval, select the balanced maintenance time period within the reliability interval.

[0110] S53: Man-hour screening, screening the man-hours in a single time period and the total man-hours in each time period for the remaining balance solution set screened in step S52;

[0111] The specific method of man-hour screening in step S53 is:

[0112] S531: Single time period working hours screening. The total working hours of tasks balanced within a single time period must meet the remaining available time of the time period. The formula is as follows:

[0113]

[0114] Where N is the balancing granularity, n is the number of balancing items, j is the sequence number of the balancing range divided equally according to the granularity, and X ij is a binary decision variable, indicating the Is the task assigned to time periods, of which =1 means allocation, =0 means unallocated;

[0115] S532: The total working hours in each time period are screened, and the difference between the balanced working hours in each time period and the average working hours after the balance is minimized. The formula is as follows:

[0116] ;

[0117] Where N is the equilibrium granularity, It is the difference between the working hours used in this time period after equalization and the average working hours after equalization of each section, and j is the serial number after the equalization range is divided into equal parts according to the granularity.

[0118] S54: Cost analysis: Calculate the life cycle maintenance cost of the remaining balanced solution set selected in step S53, and select the balanced solution with the minimum life cycle maintenance cost as the optimal balanced arrangement solution. The life cycle maintenance cost C Sk The formula is as follows:

[0119] ;

[0120] Where T is the balancing period, T0 is the time point for the repair, C i is the cost of each maintenance task, N is the balancing granularity, L is the vehicle design life, j is the sequence number of the balancing range divided into equal parts according to the granularity, is a binary decision variable, indicating the Is the task assigned to time periods, of which =1 means allocation, =0 means unassigned.

[0121] This embodiment is to identify a line repair point and select the balanceable points for screening. Steps S1 to S3 are pre-steps. The specific method of step S3 is the method of the Chinese invention patent with publication number CN115249095A, which will not be described in detail in this application. Starting from step S4, the conditions are as follows:

[0122] 1. A total of 20 vehicles on a certain line arrive at the maintenance station at the same time.

[0123] 2. The line has an annual operating mileage of 120,000 kilometers and operates 17 hours a day.

[0124] 3. Inspection labor cost is 60 yuan / hour.

[0125] Execute step S41 to input the parameters of the equalization model. The maintenance time point T0 is 5 years, the balancing period T is 2 years (4-6 years), the balancing granularity N is 4 segments, and the equalization maintenance time period H is J The remaining available time h in the equalization maintenance time period Hj is 6 months. j The current balanced maintenance task time in the current balanced maintenance period is 90 hours / segment. The current balanced maintenance task time is N / A, which is 6.5 hours / day. The cost of each maintenance task is C i for

[0126] 1. Check the status of the travel switch 2900 yuan

[0127] 2. Check the coupling 2900 yuan

[0128] 3. Replacement of the middle support: 7400 yuan

[0129] 4. Replace the nut 10400 yuan

[0130] 5. Disassemble and inspect the door pillars 1400 yuan

[0131] 6. Check the tightening torque of the door assembly parts 1300 yuan

[0132] The vehicle design life L is 30 years, and the maintenance task man-hour is t i for

[0133] 1. Check the status of the travel switch. The working hours for a single train are 2 hours and the total working hours are 40 hours.

[0134] 2. Check the coupling, single train working hours 2 hours total working hours 40 hours

[0135] 3. Replace the middle support, single train working hours 2 hours total working hours 40 hours

[0136] 4. Replace the nut, single train working hours 2 hours total working hours 40 hours

[0137] 5. Disassemble and inspect the door pillars. The working hours for a single train are 1 hour and the total working hours are 20 hours.

[0138] 6. Check the tightening torque of the door assembly parts. The working hours for a single train are 1 hour and the total working hours are 20 hours.

[0139] The number of equilibriatable points n is 6.

[0140] Execute step S42: select the balancing range.

[0141] Calculate the total working hours of the balanced items =200 hours

[0142] The total available time within the balancing period = 360 hours > 200 hours, so the balancing screening can continue.

[0143] Step S51 is executed to generate 84 balancing solutions according to the number of balancing items n, the balancing period T and the balancing granularity N using the partition method.

[0144] The reliability interval and economic interval obtained in step S3 are as follows:

[0145] 1. Check the status of the travel switch. The reliability interval is 1.2 million kilometers, and the economy interval is 300,000-400,000 kilometers.

[0146] 2. Check the coupling. The reliability interval is 249 per 10,000 kilometers and the economy interval is 670,000-740,000 kilometers.

[0147] 3. Replace the intermediate support, the reliability range is 720,000 kilometers, and the economic range is 710,000-740,000 kilometers.

[0148] 4. Replace the nut. The reliability interval is 208 per 10,000 kilometers, and the economic interval is 1-105 million kilometers.

[0149] 5. Disassemble and inspect the door pillars, the reliability interval is 650,000 kilometers, and the economic interval is 600,000-640,000 kilometers.

[0150] 6. Check the tightening torque of the door assembly parts. The reliability interval is 930,000 kilometers and the economic interval is 200,000-280,000 kilometers.

[0151] Execute step S52: Task interval screening to obtain the balancing time period and balancing time period range.

[0152] 1. Check the status of the travel switch. The balancing period is H1, and the balancing period range is 300,000-400,000 kilometers.

[0153] 2. Check the coupling, the balancing period is H4, and the balancing period range is 670,000-740,000 kilometers.

[0154] 3. Replace the middle support, the balancing period can be H4, and the balancing period range is 710,000-720,000 kilometers.

[0155] 4. Replace the nut to balance the period H1-H4, and the range of the balancing period is 0-2.08 million kilometers.

[0156] 5. Disassemble and inspect the door column, the balancing period is H3, and the balancing period range is 600,000-640,000 kilometers.

[0157] 6. Check the tightening torque of the door assembly parts. The balancing period is H1-H4, and the balancing period range is 0-930,000 kilometers.

[0158] The balancing period is further explained, where: (The balancing period T is 4-6 years, excluding the 5th year, the duration is 2 years, and the balancing granularity N is 4 segments, so the balancing maintenance period H J The line runs for 6 months in a year, with an annual operating mileage of 120,000 kilometers. Therefore, the mileage corresponding to H1 is 360,000-420,000 kilometers, the mileage corresponding to H2 is 420,000-480,000 kilometers, the mileage corresponding to H3 is 600,000-660,000 kilometers, and the mileage corresponding to H4 is 660,000-720,000 kilometers.

[0159] Execute step S53, S531: filter working hours in a single time period.

[0160] The balancing scheme is further screened by ensuring that the total working hours of the tasks balanced in a single time period meet the remaining available time of the time period. The analysis results of the task interval analysis are used as the input of this step to obtain the following information

[0161] H1, fixed execution task number 1, variable execution task number 4&6.

[0162] H2, fixed execution task number is none, variable execution task number is 4&6.

[0163] H3, fixed execution task number 5, variable execution task number 4&6.

[0164] H4, fixed execution task numbers 2&3, variable execution task numbers 4&6.

[0165] Taking H4 time period as an example, the balanced maintenance time period H jThe remaining available time in h j The total fixed execution time of H4 is 80 hours, and any one of point 4 (40 hours) or point 6 (20 hours) will result in the remaining available working time exceeding 90 hours in this time period. Therefore, the balancing plan after the working time limit is determined as follows:

[0166] H1, Scheme 1 after working hours screening; 1&4; 1&6

[0167] H2, plan after working hours screening 0; 4; 6; 4&6

[0168] H3, plan 5 after working hours screening; 5&4; 5&6; 5&4&6

[0169] H4, Scheme 2 & 3 after man-hour screening

[0170] Execute step S532, filter the total working hours in each time period, and minimize the sum of the differences between the balanced working hours in each time period and the balanced average working hours.

[0171] Step S41 has been disclosed and The formula for calculation is .

[0172] ;

[0173] H1, corresponding to item 1, =4270,

[0174] H1, corresponding to item 6, =4250,

[0175] H1, corresponding to item 1&6, =4290,

[0176] H2, no corresponding point, =4230,

[0177] H2, corresponding to item 4, =4270,

[0178] H2, corresponding to item 6, =4250,

[0179] H2, corresponding to item 4&6, =4290,

[0180] H3, corresponding to item 5, =4250,

[0181] H3, corresponding to item 5&4, =4290,

[0182] H3, corresponding to item 5&6, =4270,

[0183] H3, corresponding to item 5&4&6, =4310,

[0184] H4, corresponding to item 2&3, =4310,

[0185] The total working hours in each time period are filtered out as H1, corresponding to item 1, H2, corresponding to item 4, H3, corresponding to item 5&6, H4, corresponding to item 2&3, =46.667.

[0186] Example 2

[0187] The parameters of the balancing model in this embodiment are the same as those in embodiment 1, except that, in order to illustrate step S54: cost analysis, the two groups selected after executing step S532 are selected. Cost analysis of suboptimal solutions with the same value.

[0188] Solution 2, H1, corresponding to item 1&6, H2, corresponding to item 4, H3, corresponding to item 5, H4, corresponding to item 2&3, =80

[0189] Solution 3, H1, corresponding to item 1, H2, corresponding to item 4&6, H3, corresponding to item 5, H4, corresponding to item 2&3, =80

[0190] H1, the time period for balanced overhaul is 360,000-420,000 kilometers, the number of task executions is 9 times, the corresponding item points for Plan 2 are 1&6, the inspection cost is 37,800 yuan, and the corresponding item point for Plan 3 is 1, and the inspection cost is 26,100 yuan.

[0191] H2, the time period for balanced overhaul is 420,000-480,000 kilometers, the number of task executions is 7 times, the corresponding item point for Plan 2 is 4, the inspection cost is 72,800 yuan, and the corresponding item points for Plan 3 are 4&6, and the inspection cost is 81,900 yuan.

[0192] H3, the time period for balanced overhaul is 600,000-660,000 kilometers, the number of task executions is 5 times, the corresponding item points for Plan 2 are 5, the inspection cost is 7,000 yuan, and the corresponding item points for Plan 3 are 5, the inspection cost is 7,000 yuan.

[0193] H4, the time period for balanced overhaul is 660,000-720,000 kilometers, the number of task executions is 5 times, the corresponding items of Scheme 2 are 2&3, the inspection cost is 51,500 yuan, and the corresponding items of Scheme 3 are 2&3, the inspection cost is 51,500 yuan.

[0194] The total cost of Plan 2 is 169,100 yuan, and the total cost of Plan 3 is 166,500 yuan. It is finally determined that Plan 2 is better than Plan 3.

[0195] Example 3

[0196] The rest of this embodiment is the same as that of Embodiment 1, except that in order to show another situation of selecting the balancing range in step S42, the number of balancing items in this embodiment is 11, and the working hours of each newly added item is 40 hours. =400 hours, =360 hours, at this time , it is impossible to continue the balanced screening. At this time, there is no suitable time period to arrange the average maintenance task. Make the following adjustments 1 or 2:

[0197] 1. Increase the balancing period: The available time needs to be increased by at least 40 hours. Combined with the case preconditions, it can be seen that the balancing period needs to be increased by 40 hours / (24 hours - line operation time 17 hours / day - the existing balancing repair task working hours during the existing balancing repair period N / A is 6.5 hours / day) = 80 days, that is, 40 days of balancing period are added before and after 4-6 years respectively.

[0198] 2. Reduce the equilibrable item point: Reduce one equilibrable item point.

[0199] The present invention adopts engineering analysis and data modeling methods, takes the process requirements of maintenance tasks as the identification and judgment criteria for whether they can be balanced, takes maintenance intervals, maintenance hours, and maintenance costs as constraints, establishes a task balance model, and evenly arranges the equipment rack maintenance items to obtain task balance. Based on the balanced task arrangement, an economic model is established to obtain the economic data of the balanced arrangement plan. Through balance and economy, combined with human resources and equipment resources, a balanced decision is made with a reasonable distribution of working hours and significant economic efficiency.

[0200] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A method for balancing high-end equipment advanced maintenance tasks based on availability and maintenance cost, characterized by: The following steps are involved: S1. Formulate structured maintenance procedures and itemize maintenance tasks in the structured maintenance procedures; S2: Identify the maintenance balancing points, identify the maintenance nature of the maintenance task, and select the maintenance points; S3: Task interval balancing analysis, using reliability and economy as constraints to perform data analysis and obtain the balancing period of task intervals; S4: Establish a balanced model for maintenance, determine the balanced range, and use the characteristics of maintenance tasks as constraints to obtain a balanced model for maintenance; S5: Output the balanced layout plan, analyze the balance and economy of the rack repair balanced model, and output the balanced layout plan; The specific method of step S4 is: S41: Inputting the parameters of the balancing model, which include: the time point of the rack repair T0, the balancing period T, the balancing granularity N, and the balancing rack repair time period H. J , Balanced maintenance time period H J The remaining available time in h j , the cost of each repair task C i , vehicle design life L, each frame repair task working hours t i , the working hours used in this time period after balancing W j , the difference between the working hours used in this time period after equalization and the average working hours after equalization of each period T θj And the number of equilibrable items n; The working hours used in this time period after balancing ; in is a binary decision variable, indicating the Is the task assigned to time periods, of which =1 means allocation, =0 means unallocated; The difference between the working hours used in this time period after equalization and the average working hours after equalization of each period ; S42: Balance range selection, judging whether the total working hours of the balanceable item points exceeds the total available time within the balanceable period. The judgment formula is as follows: ; when When , you can continue to screen the balanced model; when When the balancing model screening cannot be continued, increase the balancing period Or reduce the number of equilibria , obtain the frame repair balancing model; The specific method of step S5 is: S51, generating a balancing solution, using the partition method according to the number of balancing items n, the balancing period T and the balancing granularity N, to generate a balancing solution set S; The number of calculation schemes using the partition method is k, and the formula is as follows: ; S52: Task interval screening, through the input of reliability interval and economic interval of equilibrable item points, the equilibration scheme set S is screened; S53: Man-hour screening, screening the man-hours in a single time period and the total man-hours in each time period for the remaining balance solution set screened in step S52; S54: Cost analysis: screening the remaining balanced solution set selected in step S53 for the full life cycle maintenance cost, and taking the balanced solution with the minimum full life cycle maintenance cost as the optimal balanced arrangement solution. Sk The formula is as follows: ; Where T is the balancing period, T0 is the time point for the repair, C i is the cost of each maintenance task, N is the balancing granularity, L is the vehicle design life, j is the sequence number of the balancing range divided into equal parts according to the granularity, is a binary decision variable, indicating the Is the task assigned to time periods, of which =1 means allocation, =0 means unassigned.

2. The method for balancing high-end equipment advanced maintenance tasks based on availability and maintenance cost according to claim 1 is characterized by: The specific method of man-hour screening in step S53 is: S531: Single time period working hours screening. The total working hours of tasks balanced within a single time period must meet the remaining available time of the time period. The formula is as follows: ; Where N is the balancing granularity, n is the number of balancing items, and j is the sequence number of the balancing range divided into equal parts according to the granularity. X OP is a binary decision variable, indicating the Is the task assigned to time periods, of which =1 means allocation, =0 means unallocated; S532: The total working hours in each time period are screened, and the difference between the balanced working hours in each time period and the average working hours after the balance is minimized. The formula is as follows: ; Where N is the equilibrium granularity, It is the difference between the working hours used in this time period after equalization and the average working hours after equalization of each section, and j is the serial number after the equalization range is divided into equal parts according to the granularity.

3. The method for balancing high-end equipment advanced maintenance tasks based on availability and maintenance cost according to claim 2 is characterized by: The specific method for selecting the repair items in step S2 is: S21: Identify the maintenance task level, whether the maintenance task is routine maintenance or advanced maintenance; S22: Identify necessary replacement parts, and identify whether the parts involved in the rack repair task are necessary replacement parts; S23: Identify the maintenance station and whether it can be repaired in situ; S24: Identify the repair method, whether it is self-repair or outsourced repair; S25: Inputting process requirements into the structured maintenance procedure; S26: Inputting spare part type into the structured maintenance procedure; S27: Identify whether it is covered, identify whether it is covered by daily maintenance; S28: Balance analysis to see whether it can be incorporated into daily maintenance.

4. The method for balancing high-end equipment advanced maintenance tasks based on availability and maintenance cost according to claim 3 is characterized by: The specific screening conditions of step S52 are: VS1: When the reliability interval is less than the economic interval, only the balanced maintenance time period that is less than the reliability interval can be allocated; VS2: When the economic interval left < reliability interval < economic interval right, choose a balanced maintenance time period between reliability and economy left; VS3: When the economic interval is less than the reliability interval, select the balanced maintenance time period within the reliability interval.

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