CN116151634B - Economic distribution method for overhaul cost of aero-engine - Google Patents

Economic distribution method for overhaul cost of aero-engine Download PDF

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CN116151634B
CN116151634B CN202310408925.9A CN202310408925A CN116151634B CN 116151634 B CN116151634 B CN 116151634B CN 202310408925 A CN202310408925 A CN 202310408925A CN 116151634 B CN116151634 B CN 116151634B
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耿杰
高卓颖
李颖
吕川
王维
郭子玥
周栋
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Beihang University
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Abstract

The invention discloses an economic distribution method for overhaul cost of an aeroengine, which comprises the following steps of 1, determining weighting factors and weighting values of parts: for parts and components
Figure ZY_2
Determined weighting factor
Figure ZY_5
Scoring, marking the score as a weighted value
Figure ZY_9
The method comprises the steps of carrying out a first treatment on the surface of the Step 2, determining the failure rate of each part: the failure rate of each part during the factory return overhaul is calculated by combining the multiparty data, aiming at the part
Figure ZY_1
The failure rate is recorded as
Figure ZY_6
The method comprises the steps of carrying out a first treatment on the surface of the Step 3, calculating the weighted factor average value of all parts of the engine
Figure ZY_7
The method comprises the steps of carrying out a first treatment on the surface of the Step 4, calculating the failure rate average value of all parts of the engine
Figure ZY_10
The method comprises the steps of carrying out a first treatment on the surface of the Step 5, calculating comprehensive weighting coefficients of overhaul cost distribution of each part; step 6, distributing the overhaul cost control index of each part, wherein the parts
Figure ZY_3
The overhaul cost control index of (2) is
Figure ZY_4
，
Figure ZY_8
. The economic distribution method of the overhaul cost of the aeroengine with the structure can determine the cost requirement of overhaul of each part of the engine, so that a repair shop can select a proper part repair method according to the cost requirement.

Description

Economic distribution method for overhaul cost of aero-engine
Technical Field
The invention relates to the technical field of aircraft engine maintenance cost control, in particular to an economic distribution method of aircraft engine overhaul cost.
Background
With the development of domestic aeroengines, maintenance cost becomes an important cost expenditure project in the use process of aeroengines. Engine overhaul is an important way to restore engine performance and is also an important component of maintenance costs. Once the engine life is exhausted, it is necessary to timely replenish the life. Major repair is an important way to supplement the service life of engines. Engine overhaul is the complete and thorough repair of an engine when the engine flight time is close to the specified maximum service time and the performance and state of the engine continuously slide down, and is one of the most complex technologies in preventive maintenance, namely the highest-level preventive maintenance work, and is generally completed in a maintenance base or a factory. The aim of the overhaul is to restore the technical performance of the aeroengine. The content of the overhaul includes: the engine is disassembled, cleaned and checked, the discovered faults and defects are removed, unqualified parts are repaired or replaced, then the reassembly and the test are carried out, the specified maintenance work is completed, and finally the engine is packaged and delivered. The overhaul is a timing maintenance, and when an engine with a specified overhaul time limit is used, complete and thorough disassembly, reinstallation and test are required, and the engine is restored to a usable state according to the specified overhaul specification. In theory, after a return to the factory overhaul, the aero-engine can recover its original reliability level and performance level.
Reducing the overhaul cost of the engine is of great importance to the use efficiency of the equipment. In the overhaul process, the repair process of parts of the aeroengine is relatively fixed, but the repair cost of the repair mode, the repair man-hour and the like are quite different. The maintenance strategy is scientific, reasonable and effective in planning, and has important effects on accurately implementing the maintenance work of the aero-engine, quickly recovering and improving the performance of the engine under the constraint of cost.
The current research on an engine overhaul economy optimization method mainly focuses on two directions of adjusting the overhaul interval and adjusting the engine overhaul working range. The adjustment of the overhaul interval mainly starts from the aspects of fault data of engine parts, service life distribution functions of the engine parts, performance degradation degree and the like, and considers factors such as fault rate, repair time, repair cost and the like of the parts, and the optimal maintenance interval is determined with minimum maintenance cost as a target. The maintenance working range optimization method mainly focuses on the rationality of an engine overhaul scheme, and researches are carried out by utilizing various methods such as an attribute importance judging method, a variable precision rough set theory, SOM network discrete values, a genetic algorithm, a particle swarm algorithm and the like, so that the maintenance working range of the engine is more matched with the actual state of the engine.
In the existing optimization method, the main focus is on how to reduce the overhaul cost of the engine as much as possible by adjusting the overhaul work of the engine, the overhaul cost cannot be ensured to meet the cost control requirement, and the research result mostly stays at the theoretical level, and the research object mostly only comprises important parts of the engine, so that the current research result cannot be well applied to the actual overhaul of the engine, especially the whole engine or even the overhaul work of a certain model. For this reason, it is required to provide an economic allocation method of overhaul costs of an aeroengine to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide an economic distribution method for overhaul costs of an aeroengine, which is characterized in that on the premise of ensuring that the overhaul costs of the engine meet cost control requirements, the economic distribution method for the overhaul costs based on the overhaul rules of the engine is provided from the perspective of parts, the overall overhaul costs of the engine are reasonably distributed to all parts, and the cost requirements of the overhaul of all parts of the engine are defined, so that a repair shop can conveniently select a proper part maintenance method according to the cost requirements.
In order to achieve the above object, the present invention provides an economic allocation method for overhaul cost of an aeroengine, comprising the following steps:
step 1, determining weighting factors and weighting values of parts: the weighting factors include the repair characteristics of the component itself and the component function factors, and the components are respectively marked as
Figure SMS_2
、/>
Figure SMS_4
、/>
Figure SMS_9
、…、/>
Figure SMS_3
Each weighting factor is marked +.>
Figure SMS_6
、/>
Figure SMS_7
、…、/>
Figure SMS_10
For parts->
Figure SMS_1
Determined weighting factor->
Figure SMS_5
Scoring, namely marking the score value as a weighted value +.>
Figure SMS_8
；
Step 2, determining the failure rate of each part: aiming at the engine model to be distributed with cost economy, historical maintenance data collection and analysis work of each part is carried out, the failure rate of each part during factory return overhaul is calculated by combining multiparty data, and the failure rate of each part is aimed at the part
Figure SMS_11
The failure rate is recorded as +.>
Figure SMS_12
；
Step 3, calculating the weighted factor average value of all parts of the engine: first, the components in step 1
Figure SMS_13
Weighting factor of->
Figure SMS_14
Weight value of +.>
Figure SMS_15
On the basis of which the component is calculated->
Figure SMS_16
Weighted sum +.>
Figure SMS_17
：
Figure SMS_18
wherein ,
Figure SMS_19
representing parts->
Figure SMS_20
Weighting factor of->
Figure SMS_21
Is a weighted value of (2);
then, calculating the average value of the weighting factors of all parts of the engine
Figure SMS_22
：
Figure SMS_23
wherein ,
Figure SMS_24
representing parts->
Figure SMS_25
Is a weighted sum of (2);
step 4, calculating the failure rate average value of all parts of the engine: the failure rate of each part of the engine in the step 2 is used for supporting data, the data are summed and averaged, and the average value of the failure rates of all parts of the engine is calculated
Figure SMS_26
：
Figure SMS_27
wherein ,
Figure SMS_28
representing parts->
Figure SMS_29
Is a failure rate of (1);
step 5, calculating comprehensive weighting coefficients of overhaul cost distribution of each part: the weighted factor average value of all parts of the engine calculated in the step 3
Figure SMS_30
And the mean value of the failure rates of all parts of the engine calculated in the step four +.>
Figure SMS_31
Based on the calculation of the overhaul cost of each partAssigned comprehensive weighting coefficients, wherein the component ∈ ->
Figure SMS_32
Comprehensive weighting coefficient of overhaul cost allocation +.>
Figure SMS_33
The calculation method of (1) is as follows:
Figure SMS_34
wherein ,
Figure SMS_35
the failure rate average value of all parts of the engine; />
Figure SMS_36
Representing parts->
Figure SMS_37
Is a weighted sum of (2); />
Figure SMS_38
Representing parts->
Figure SMS_39
Is a failure rate of (1); />
Figure SMS_40
A weight factor average value representing all parts of the engine;
step 6, distributing overhaul cost control indexes of all parts: performing economical allocation work on the engine overhaul cost control indexes by taking the comprehensive weighting coefficient of the overhaul cost allocation of each part calculated in the step 5 as a basis, allocating the engine overhaul cost control indexes to each part by using an allocation model, and calculating the overhaul cost control indexes of each part, wherein the parts are
Figure SMS_41
Major repair cost control index->
Figure SMS_42
The calculation method of (1) is as follows:
Figure SMS_43
wherein ,
Figure SMS_44
is a part->
Figure SMS_45
Comprehensive weighting coefficients of overhaul cost allocation; and C is an engine overhaul cost control index.
Preferably, the repair characteristics of the component itself are those that affect repair, including repair mode, repair depth, and repair procedure, determined by the material and structure of the component itself; the component functional factors are maintenance-affecting characteristics determined by the functions of the component itself, including the importance of the component, the influence on the safety of the engine, and the life of the component; in actual operation, proper repair characteristics of the parts and functional factors of the parts are required to be selected according to the characteristics of the parts and the engine.
Preferably, for parts
Figure SMS_46
Determined weighting factor->
Figure SMS_47
The greater the weighting value is for the degree of influence of the repair characteristic on the repair costs>
Figure SMS_48
The higher; for parts->
Figure SMS_49
Determined weighting factor->
Figure SMS_50
In the case of a component function, the greater the degree of influence of the component function on the component or on the engine function is the weighting value +.>
Figure SMS_51
The higher.
Preferably, the parts are the smallest units which can be split in the actual overhaul work of the engine.
Therefore, the economic distribution method for the overhaul cost of the aero-engine with the structure has the following beneficial effects:
1. the influence of the repair characteristics and the functional factors of the parts on the repair cost of the parts is fully considered, the factors are scored to obtain weighted values, and the weighted values are used as one of the overhaul cost allocation references of the parts, so that the allocation values of the overhaul cost are more in line with the actual overhaul conditions and are more reasonable;
2. according to the invention, the control index of the overhaul cost of the engine is used as an economic distribution index, the economic distribution work is carried out, and the overhaul cost is controlled from the root;
3. the minimum unit body-parts of the actual overhaul of the engine are used as economic allocation objects of the overhaul cost, the overhaul cost value is allocated to each part, and a overhaul factory can select a reasonable part maintenance method according to the allocation value, so that the result of the allocation method has operability.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a logic diagram of an embodiment of an economic dispatch method for overhaul of an aircraft engine of the present invention.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in the figure, the method is used for solving the problem of cost control of overhaul of an aeroengine, and considers the repair characteristics of parts and the influence of the functional factors of the parts on the repair cost of the parts from the minimum repair unit-part level of the overhaul of the aeroengine, determines weighting factors and weighting values corresponding to the weighting factors, determines comprehensive weighting coefficients of the overhaul cost distribution of the parts based on the failure rate average value of all the parts of the engine and the weighting factor average value of all the parts of the calculated engine, and distributes the overhaul cost control index of the engine based on the comprehensive weighting coefficients of the overhaul cost distribution of the parts to obtain the overhaul cost control index of the parts. The method comprises the following specific steps:
step 1, determining weighting factors and weighting values of parts:
the parts are the minimum units which can be split in the actual overhaul work of the engine, the maintenance method of the parts determines the maintenance cost, the selection of the maintenance method depends on the self-repair characteristic of the parts on one hand and also considers the functional factors of the parts on the other hand, so the weighting factors in the invention comprise the self-repair characteristic of the parts and the functional factors of the parts. The repair characteristics of the parts are characteristics which are determined by the materials and the structures of the parts and affect the repair, including repair modes, repair depths and repair procedures; component functional factors are maintenance affecting characteristics determined by the component's own function, including component importance, impact on engine safety, and component life. In actual operation, proper repair characteristics of the parts and functional factors of the parts are required to be selected according to the characteristics of the parts and the engine.
The parts are respectively marked as
Figure SMS_59
、/>
Figure SMS_53
、/>
Figure SMS_56
、…、/>
Figure SMS_55
Each weighting factor is marked +.>
Figure SMS_58
、/>
Figure SMS_61
、…、/>
Figure SMS_64
For parts->
Figure SMS_60
Determined weighting factor->
Figure SMS_63
Scoring, namely marking the score value as a weighted value +.>
Figure SMS_52
. For parts->
Figure SMS_57
Determined weighting factor->
Figure SMS_62
The greater the weighting value is for the degree of influence of the repair characteristic on the repair costs>
Figure SMS_65
The higher; for parts->
Figure SMS_66
Determined weighting factor->
Figure SMS_67
In the case of a component function, the greater the degree of influence of the component function on the component or on the engine function is the weighting value +.>
Figure SMS_54
The higher.
Step 2, determining the failure rate of each part:
the failure rate of the parts directly influences the maintenance modes of the parts, the cost generated by different maintenance modes is different, and determining the failure rate of the parts is a key for distributing overhaul cost. Aiming at the engine model to be distributed with cost economy, historical maintenance data collection and analysis work of each part is carried out, the failure rate of each part during factory return overhaul is calculated by combining multiparty data, and the failure rate of each part is aimed at the part
Figure SMS_68
The failure rate is recorded as +.>
Figure SMS_69
；
Step 3, calculating the weighted factor average value of all parts of the engine: first, the components in step 1
Figure SMS_70
Weighting factor of->
Figure SMS_71
Weight value of +.>
Figure SMS_72
On the basis of which the component is calculated->
Figure SMS_73
Weighted sum +.>
Figure SMS_74
：
Figure SMS_75
wherein ,
Figure SMS_76
representing parts->
Figure SMS_77
Weighting factor of->
Figure SMS_78
Is a weighted value of (2);
then, calculating the average value of the weighting factors of all parts of the engine
Figure SMS_79
：
Figure SMS_80
wherein ,
Figure SMS_81
representing parts->
Figure SMS_82
Is a weighted sum of (2);
step 4, calculating the failure rate average value of all parts of the engine: the failure rate of each part of the engine in the step 2 is used for supporting data, the data are summed and averaged, and the average value of the failure rates of all parts of the engine is calculated
Figure SMS_83
：
Figure SMS_84
wherein ,
Figure SMS_85
representing parts->
Figure SMS_86
Is a failure rate of (1);
step 5, calculating comprehensive weighting coefficients of overhaul cost distribution of each part: the weighted factor average value of all parts of the engine calculated in the step 3
Figure SMS_87
And the mean value of the failure rates of all parts of the engine calculated in the step four +.>
Figure SMS_88
Based on this, a comprehensive weighting factor for the allocation of the overhaul costs for the individual components is calculated, wherein the components ∈ ->
Figure SMS_89
Comprehensive weighting coefficient of overhaul cost allocation +.>
Figure SMS_90
Is calculated by the method of (a)The method comprises the following steps:
Figure SMS_91
wherein ,
Figure SMS_92
the failure rate average value of all parts of the engine; />
Figure SMS_93
Representing parts->
Figure SMS_94
Is a weighted sum of (2); />
Figure SMS_95
Representing parts->
Figure SMS_96
Is a failure rate of (1); />
Figure SMS_97
A weight factor average value representing all parts of the engine;
step 6, distributing overhaul cost control indexes of all parts: performing economical allocation work on the engine overhaul cost control indexes by taking the comprehensive weighting coefficient of the overhaul cost allocation of each part calculated in the step 5 as a basis, allocating the engine overhaul cost control indexes to each part by using an allocation model, and calculating the overhaul cost control indexes of each part, wherein the parts are
Figure SMS_98
Major repair cost control index->
Figure SMS_99
The calculation method of (1) is as follows:
Figure SMS_100
wherein ,
Figure SMS_101
is a part->
Figure SMS_102
Comprehensive weighting coefficients of overhaul cost allocation; and C is an engine overhaul cost control index, and the cost generated in the maintenance process of the engine cannot exceed the engine overhaul cost control index.
Examples
The method is described by taking overhaul data of typical parts of an engine, such as a valve, a bearing casing, a gear, a bearing, a pipe joint and a blade as an example.
Step one, determining the weighting factors and the weighting values of the parts
One type of weighting factor repair characteristic affecting component repair in this embodiment includes repair mode, repair depth, and repair flow, where the repair mode of the component includes two types of replacement and repair; repair depths can be classified into a plurality of levels of complete repair, incomplete repair, and minimum repair; the repair procedure includes three repair steps, cleaning, inspection/verification, and repair. Another type of weighting factor that affects component repair—component functional factors include component importance and impact on engine safety.
Taking typical engine part valves, bearing cases, gears, bearings, pipe joints and blades as examples, taking 5 minutes as an upper limit value, scoring the weighting factors, wherein the scores are as follows:
Figure SMS_103
step two, determining the failure rate of each part
And carrying out historical maintenance data collection and analysis work of each part, and calculating the failure rate of each part when the parts are subjected to major repair in a factory by combining multiparty data, wherein the calculation result is shown in the following table:
Figure SMS_104
step three, the weighted factor average value of all parts of the engine
In the first step
Figure SMS_105
Weight value of +.>
Figure SMS_106
On the basis of which a weighted sum of the individual components is calculated>
Figure SMS_107
Further obtain the weighted factor average value +.>
Figure SMS_108
The calculation results are shown in the following table:
Figure SMS_109
step four, calculating the failure rate average value of all parts of the engine
Based on the failure rate of each part of the engine in the second step as data, the formula is utilized
Figure SMS_110
Calculating to obtain the failure rate average value +.>
Figure SMS_111
0.65.
Step five, comprehensive weighting coefficient of overhaul cost distribution of each part
Using the calculation results in the first to fourth steps as data support, and using the formula
Figure SMS_112
Calculating the comprehensive weighting coefficient of the overhaul cost distribution of each part>
Figure SMS_113
The calculation results are shown in the following table:
Figure SMS_114
step six, distributing overhaul cost control indexes of all parts
The known control index of the overhaul cost of the engine is marked as 5 ten thousand yuan, and the weighting coefficient in the fifth step is used
Figure SMS_115
Based on, use the formula ∈ ->
Figure SMS_116
Calculating the overhaul cost control index of the part, wherein the distribution result is as follows:
Figure SMS_117
therefore, the invention adopts the economic distribution method of the overhaul cost of the aeroengine with the structure, on the premise of ensuring that the overhaul cost of the engine meets the cost control requirement, the level of a specific object part implemented by the overhaul work of the engine is taken as an economic distribution level, the control index of the overhaul cost of the engine is taken as an economic distribution index, the overhaul rule of the engine is taken as a standard flow of the overhaul of the engine, the economic distribution method of the overhaul cost based on the overhaul rule of the engine is provided from the angle of the part, the overhaul cost of the whole engine is reasonably distributed to each part, and the requirement of the overhaul cost of each part of the engine is defined, so that a repair shop can select a proper maintenance method of the part according to the requirement of the cost.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting it, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the invention can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the invention.

Claims (4)

1. An economic distribution method for overhaul cost of an aeroengine is characterized by comprising the following steps of: the method comprises the following steps:
step 1, determining weighting factors and weighting values of parts: the weighting factors include the repair characteristics of the component itself and the component function factors, and the components are respectively marked as
Figure QLYQS_1
、/>
Figure QLYQS_6
、/>
Figure QLYQS_7
、…、/>
Figure QLYQS_3
Each weighting factor is marked +.>
Figure QLYQS_4
、/>
Figure QLYQS_8
、…、
Figure QLYQS_10
For parts->
Figure QLYQS_2
Determined weighting factor->
Figure QLYQS_5
Scoring, namely marking the score value as a weighted value +.>
Figure QLYQS_9
；
Step 2, determining the failure rate of each part: aiming at the engine model to be distributed with cost economy, historical maintenance data collection and analysis work of each part is carried out, and the parts are calculated to be returned to factories in combination with multiparty dataFailure rate during repair of parts
Figure QLYQS_11
The failure rate is recorded as +.>
Figure QLYQS_12
；
Step 3, calculating the weighted factor average value of all parts of the engine: first, the components in step 1
Figure QLYQS_13
Weighting factor of->
Figure QLYQS_14
Weight value of +.>
Figure QLYQS_15
On the basis of which the component is calculated->
Figure QLYQS_16
Weighted sum +.>
Figure QLYQS_17
：
Figure QLYQS_18
；
wherein ,
Figure QLYQS_19
representing parts->
Figure QLYQS_20
Weighting factor of->
Figure QLYQS_21
Is a weighted value of (2);
then, calculating the average value of the weighting factors of all parts of the engine
Figure QLYQS_22
：
Figure QLYQS_23
；
wherein ,
Figure QLYQS_24
representing parts->
Figure QLYQS_25
Is a weighted sum of (2);
step 4, calculating the failure rate average value of all parts of the engine: the failure rate of each part of the engine in the step 2 is used for supporting data, the data are summed and averaged, and the average value of the failure rates of all parts of the engine is calculated
Figure QLYQS_26
：
Figure QLYQS_27
；
wherein ,
Figure QLYQS_28
representing parts->
Figure QLYQS_29
Is a failure rate of (1);
step 5, calculating comprehensive weighting coefficients of overhaul cost distribution of each part: the weighted factor average value of all parts of the engine calculated in the step 3
Figure QLYQS_30
And the failure rate average value of all parts of the engine calculated in the step four
Figure QLYQS_31
Based on the calculation of the comprehensive weighting coefficient of the overhaul cost distribution of each partWherein the parts are->
Figure QLYQS_32
Comprehensive weighting coefficient of overhaul cost allocation +.>
Figure QLYQS_33
The calculation method of (1) is as follows:
Figure QLYQS_34
；
wherein ,
Figure QLYQS_35
the failure rate average value of all parts of the engine; />
Figure QLYQS_36
Representing parts->
Figure QLYQS_37
Is a weighted sum of (2); />
Figure QLYQS_38
Representing parts->
Figure QLYQS_39
Is a failure rate of (1); />
Figure QLYQS_40
A weight factor average value representing all parts of the engine;
step 6, distributing overhaul cost control indexes of all parts: performing economical allocation work on the engine overhaul cost control indexes by taking the comprehensive weighting coefficient of the overhaul cost allocation of each part calculated in the step 5 as a basis, allocating the engine overhaul cost control indexes to each part by using an allocation model, and calculating the overhaul cost control indexes of each part, wherein the parts are
Figure QLYQS_41
Major repair cost control index->
Figure QLYQS_42
The calculation method of (1) is as follows:
Figure QLYQS_43
；
wherein ,
Figure QLYQS_44
is a part->
Figure QLYQS_45
Comprehensive weighting coefficients of overhaul cost allocation; and C is an engine overhaul cost control index.
2. The method for economic dispatch of overhaul costs of an aircraft engine according to claim 1, characterized in that: the repair characteristics of the parts are characteristics which are determined by the materials and the structures of the parts and affect the repair, including repair modes, repair depths and repair procedures; the component functional factors are maintenance-affecting characteristics determined by the functions of the component itself, including the importance of the component, the influence on the safety of the engine, and the life of the component; in actual operation, proper repair characteristics of the parts and functional factors of the parts are required to be selected according to the characteristics of the parts and the engine.
3. The method for economic dispatch of overhaul costs of an aircraft engine according to claim 2, characterized in that: for parts and components
Figure QLYQS_46
Determined weighting factor->
Figure QLYQS_47
The greater the weighting value is for the degree of influence of the repair characteristic on the repair costs>
Figure QLYQS_48
The higher; for parts->
Figure QLYQS_49
Determined weighting factor->
Figure QLYQS_50
In the case of a component function, the greater the degree of influence of the component function on the component or on the engine function is the weighting value +.>
Figure QLYQS_51
The higher.
4. The method for economic dispatch of overhaul costs of an aircraft engine according to claim 3, wherein: the parts are the minimum units which can be split in the actual overhaul work of the engine.
CN202310408925.9A 2023-04-18 2023-04-18 Economic distribution method for overhaul cost of aero-engine Active CN116151634B (en)

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CN114819417A (en) * 2022-06-28 2022-07-29 北京航空航天大学 Aero-engine overhaul cost prediction method and system based on correlation between costs

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