CN115204556A

CN115204556A - Method and system for evaluating construction efficiency of maintenance line of aircraft engine

Info

Publication number: CN115204556A
Application number: CN202210456300.5A
Authority: CN
Inventors: 唐民锋; 张琴; 刘木兰; 董永耀; 赵森达; 何炯; 黄浩; 贺勃龙
Original assignee: Sichuan Chuanhang Aero Engine Maintenance Engineering Co ltd
Current assignee: Sichuan Chuanhang Aero Engine Maintenance Engineering Co ltd
Priority date: 2022-04-27
Filing date: 2022-04-27
Publication date: 2022-10-18

Abstract

The invention discloses a construction efficiency evaluation method for an aircraft engine maintenance line, which comprises the steps of firstly obtaining the constituent elements and the construction process of the maintenance line; extracting corresponding importance values from the structural elements of the maintenance line and the construction process by utilizing an expert scoring method and a five-level scoring method; constructing a maintenance line construction efficiency evaluation model, calculating the sequencing weight of each component element and the construction process which are scheduled to realize the maintenance line construction target, and taking the sequencing weight as an evaluation reference; and calculating the ranking weight of the construction process and the constituent elements in the maintenance line of the construction efficiency to be evaluated according to the steps, and analyzing the deviation of the ranking weight and the evaluation reference to finish the quantitative evaluation of the construction efficiency. The invention integrates various evaluation methods, has various experience indexes like visualization and datamation, can scientifically and visually evaluate around the maintenance efficiency, can effectively analyze at the initial stage of establishing a maintenance line, and establishes the maintenance efficiency to the highest; weak links can be found out quickly during transformation, and maintenance efficiency is improved with minimum cost.

Description

Method and system for evaluating construction efficiency of maintenance line of aero-engine

Technical Field

The invention relates to the technical field of maintenance of aero-engines, in particular to a method and a system for evaluating construction efficiency of an aero-engine maintenance line.

Background

At present, civil aviation engines in China are almost all imported from the United states and European countries, and military aviation engines also have a certain number of introduced models, which will continue to be in the future for a long time. Therefore, the construction management level of the maintenance line is improved, the maintenance guarantee requirements of civil and military aircraft engines can be met, the advanced development technology of the aircraft engines is promoted to be mastered through maintenance, and the development of the aircraft engine industry in China is promoted.

The Maintenance of the aero-engine is a complex engineering practice activity, the Maintenance line is a material foundation for implementing the Maintenance of the aero-engine, the construction efficiency of the Maintenance line is scientifically evaluated, and the Maintenance line is beneficial to the improvement of the construction management level of the Maintenance line and the improvement of the Maintenance guarantee capability of an MRO (Maintenance Repair Overhaul) enterprise of the aero-engine. Due to different maintenance product processes and different working experiences and management concepts of managers, the construction methods of the maintenance line are greatly different. However, the research results for evaluating the construction efficiency of the maintenance line at home and abroad are few, and related evaluation indexes and methods are single and general, so that the construction efficiency of the maintenance line is difficult to be comprehensively evaluated, the mutual relations between each component and each subprocess in the construction process of the maintenance line cannot be automatically and quantitatively analyzed, the consistency between the components and the content of the subprocess of the construction cannot be ensured, and the improvement of the maintenance and guarantee efficiency of the aero-engine is not facilitated.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a method and a system for evaluating the construction efficiency of an aeroengine maintenance line, integrates various evaluation methods, has various visualization and datamation experience indexes, can scientifically and visually evaluate the maintenance efficiency, and can effectively analyze the initial stage of the construction of the maintenance line so as to build the maintenance efficiency to the highest level; during transformation, weak links can be found out quickly, and maintenance efficiency is improved with the minimum cost.

The purpose of the invention is realized by the following technical scheme:

an aircraft engine maintenance line construction efficiency evaluation method comprises the following steps:

the method comprises the following steps: acquiring the constituent elements and the construction process of a maintenance line;

step two: extracting corresponding importance values from the structural elements of the maintenance line and the construction process by utilizing an expert scoring method and a five-level scoring method;

step three: constructing a maintenance line construction efficiency evaluation model, calculating the sequencing weight of each component element and the construction process which are scheduled to realize the maintenance line construction target, and taking the sequencing weight as an evaluation reference;

step four: and according to the second step, calculating the ranking weight of the construction process and the constituent elements in the maintenance line of the construction efficiency to be evaluated, analyzing the deviation of the ranking weight and the evaluation standard, and completing the quantitative evaluation of the construction efficiency.

Specifically, the first step specifically comprises: analyzing according to relevant terms of airworthiness regulations and maintenance line conditions of domestic M company and H group, and determining 7 types of components of the maintenance line: facilities, tools, equipment, personnel, maintenance data, and expenses; analyzing the construction process of 3 maintenance lines in the history of the H group, and determining that the construction process of the maintenance lines comprises three stages and 14 sub-processes; the three stages are as follows: a preparation stage, an implementation stage and an acceptance stage; the 14 subprocesses comprise a vertical organization guide mechanism, maintenance line construction feasibility demonstration, maintenance technical data configuration, maintenance line construction scheme formulation, higher-level department of charge examination and approval, maintenance line construction expense planning, land acquisition, infrastructure design and construction, tool and equipment configuration, configuration personnel, higher-level department of charge examination, first engine maintenance and first engine identification and delivery.

Specifically, the second step specifically includes the following substeps:

s21, analyzing each component by utilizing an expert scoring method to obtain the relative weight w of each component _j ；

S22, scoring the importance of each component by using a five-level scoring method, and scoring the importance of each component by using the corresponding relative weight w _j Multiplying to obtain the importance value of each constituent element, which is shown as the following formula:

M _j ＝∑w _j M _ij

wherein M is _j The importance value of the jth element; w is a _j Is the relative weight of the jth element, and ∑ w _j ＝1，0＜w _j ＜1； M _ij The grade of the importance degree of the ith expert to the jth element is judged;

s23, analyzing each subprocess in the construction process to obtain the relative weight k corresponding to each subprocess _j ；

S24, analyzing each subprocess from two dimensions of time and expense to respectively obtain the importance degree score of each subprocess, wherein the process is shown as the following formula:

N _i ＝∑(T _i /T+M _i /M)/2

wherein, N _i Is the importance score, T, of the ith sub-process _i For the implementation time of the ith sub-process, T is the total time for the maintenance line construction to be implemented, M _i The expenses invested for the ith sub-process and M is the total expenses invested for the construction of the maintenance line;

s25, carrying out weighted calculation according to the importance degree score of each subprocess to obtain the importance degree value of each subprocess, wherein the process is shown as the following formula:

S _i ＝100N _i k _j

wherein S is _i The importance of the ith sub-process; n is a radical of _i The importance score of the ith sub-process; k is a radical of formula _j Is the relative weight of the jth sub-process, and ∑ K _j ＝1，0＜k _j ＜1。

Specifically, the third step specifically comprises:

s31, constructing a maintenance line construction efficiency evaluation model by utilizing an analytic hierarchy process and combining the constituent elements of the maintenance line and the sub-process importance value of the construction process;

and S32, calculating the ranking weights of all constituent elements and the construction process, which are preset to realize the construction target of the maintenance line, in the maintenance line construction efficiency evaluation model by utilizing yaahp12 software, taking the calculated ranking weights as evaluation criteria, and adjusting the unreasonable content of the model.

Specifically, the maintenance line construction efficiency evaluation model comprises a target layer, a factor layer, a process layer and an index layer; the target layer is a maintenance line construction target which is preset to be realized; the element layer comprises 7 components of maintenance data, expenses, equipment, personnel, equipment, facilities and tools; the process layer is 14 subprocesses including establishing an organization leader mechanism, conducting maintenance line construction feasibility demonstration, configuring maintenance technical data, making a maintenance line construction scheme, examining and approving upper-level departments, financing maintenance line construction expenses, expropriating land, designing and building infrastructure, configuring tool tools and equipment, configuring personnel, examining by the upper-level departments, maintaining a first engine, identifying and delivering the first engine; the index layers are 28 evaluation indexes provided for each sub-process.

Specifically, the substep S32 specifically includes the following steps:

s3201, establishing a hierarchical structure model, establishing a maintenance line construction efficiency evaluation hierarchical structure model in yaahp12 software according to the maintenance line construction efficiency evaluation model, and judging and adjusting the rationality of the model until no unreasonable content is displayed in the model;

s3202, establishing a target layer-element layer judgment matrix, inputting importance values of all constituent elements of an element layer, judging the integrity and consistency of the target layer-element layer judgment matrix, and screening out unreasonable importance values;

s3203, automatically generating a target layer-element layer judgment matrix and simultaneously automatically generating an element layer-process layer judgment matrix, respectively inputting the importance value of each subprocess, judging the integrity and consistency of the element layer-process layer judgment matrix one by one, and screening out unreasonable importance values;

and S3204, outputting the calculation result, outputting all the ranking weights of the maintenance line construction efficiency evaluation model in a PDF format or an Excel format, and taking all the computed ranking weights as evaluation criteria for construction efficiency evaluation.

Specifically, the fourth step specifically comprises the following steps:

a) According to the maintenance line of the construction efficiency to be evaluated, according to the construction condition of the maintenance line, scoring each component according to the method of the second step and calculating the importance value of the component of the maintenance line to be evaluated;

b) Scoring each subprocess by using the method in the second step and calculating the importance value of the maintenance line subprocess to be evaluated;

c) Building a maintenance line construction efficiency evaluation model to be evaluated by using yaahp12 software, and adjusting the model to be reasonable according to software prompts;

d) Establishing a target layer-element layer judgment matrix and an element layer-process layer judgment matrix by using yaahp12 software to respectively judge the integrity and consistency of the matrixes, and adjusting the matrixes to be reasonable according to software prompts;

e) Calculating the sequencing weight values of the element layer to the target layer, the process layer to the target layer and the process layer to the element layer by using yaahp12 software;

f) Comparing the sorting weight value obtained in the step e) with the sorting weight value in the evaluation standard, and analyzing the deviation degree of the sorting weight value and the evaluation standard, wherein the lower the deviation degree is, the better the construction efficiency is;

g) If the construction efficiency of a plurality of maintenance lines needs to be compared, calculating all sequencing weight values of each maintenance line of the aero-engine to be evaluated according to the steps a) -e), and comparing the sequencing weight values with the sequencing weight values in the evaluation reference, wherein the lower the deviation degree, the better the construction efficiency.

The invention has the beneficial effects that:

1. the invention establishes a maintenance line construction efficiency model by using the theory and method of analytic hierarchy process, and calculates the ranking weight of each constituent element and each subprocess to the construction target by using yaahp12 software as an efficiency evaluation reference. For a maintenance line needing to evaluate the construction efficiency, establishing an evaluation model according to the method provided by the invention, calculating the ranking weight, and analyzing the deviation degree of the ranking weight from an evaluation reference, so that the quantitative evaluation of the construction efficiency can be completed;

2. the method analyzes and determines quantitative evaluation indexes for each subprocess of maintenance line construction, and solves the problem of quantitative evaluation of construction efficiency of a certain subprocess. The two are combined, so that the problem of evaluating the overall construction efficiency and the sub-process construction efficiency of the maintenance line is solved;

3. the invention can also be used as the decision assistance of each constituent element and each sub-process priority when the feasibility demonstration and the construction scheme are made. In specific practice, an element layer in an evaluation model is changed into a criterion layer, and a process layer is changed into a scheme layer, so that the method can be used for decision assistance of different schemes in each link of maintenance line construction, and has a wide application prospect;

4. by developing the evaluation and analysis of the construction efficiency of the maintenance line of the aeroengine, defining and analyzing the importance of the constituent elements of the maintenance line, determining the construction process, establishing an evaluation index system and an evaluation model of the construction efficiency and providing an evaluation method, the invention can provide guidance for achieving the construction target of the maintenance line with high quality, short period and low cost, and has important significance for improving the maintenance guarantee capability of the aeroengine, further improving the guarantee capability of the normal operation of the civil aviation industry, improving the guarantee capability of the fighting capacity of the military band of the aviation and promoting the development of the aeroengine industry in China.

Drawings

FIG. 1 is a flow chart of the method steps of the present invention;

FIG. 2 is a diagram of a service line component and construction process framework model;

FIG. 3 is a diagram of a type A aero-engine service line construction process;

FIG. 4 is a diagram of a type B aeroengine service line construction process;

FIG. 5 is a process diagram of the construction of a type C aeroengine service line;

FIG. 6 is a maintenance line construction process diagram;

FIG. 7 is a model diagram of maintenance line construction performance evaluation;

FIG. 8 is a P-type APU maintenance line construction process diagram.

Detailed Description

The following detailed description will be selected to more clearly understand the technical features, objects and advantages of the present invention. It should be understood that the embodiments described are illustrative of some, but not all embodiments of the invention, and are not to be construed as limiting the scope of the invention. All other embodiments that can be obtained by a person skilled in the art based on the embodiments of the present invention without any inventive step are within the scope of the present invention.

In the invention, as shown in fig. 1, a method for evaluating the construction efficiency of an aeroengine maintenance line comprises the following steps:

step three: constructing a maintenance line construction efficiency evaluation model, calculating the sequencing weight of each component element and the construction process which are scheduled to realize the maintenance line construction target, and taking the sequencing weight as an evaluation standard;

The invention establishes a maintenance line construction efficiency model by using the theory and method of analytic hierarchy process, and calculates the ranking weight of each constituent element and each subprocess to the construction target by using yaahp12 software as an efficiency evaluation reference. For a maintenance line needing to evaluate the construction efficiency, an evaluation model is established according to the method provided by the invention, the ranking weight is calculated, and the deviation degree of the ranking weight from an evaluation reference is analyzed, so that the quantitative evaluation of the construction efficiency can be completed.

The first embodiment is as follows:

in the embodiment, the structural elements and the construction process of the maintenance line are mainly determined, the structural elements and the framework model of the construction process of the maintenance line are provided, the relevant terms of civil aviation airworthiness regulations and the maintenance line conditions of the domestic M company and H group are compared, and the 7 types of structural elements of the maintenance line are determined. The construction process of 3 maintenance lines in the history of the H group is analyzed, and the construction process of the maintenance lines is determined to comprise 3 stages and 14 sub-processes.

The maintenance of the aero-engine belongs to the category of manufacturing industry divided from industry door types, and the manufacturing industry belongs to the second industry, namely the industrial component department in the national economic industry system. From this, the components of the service line and the construction process framework model can be derived, see fig. 2.

Generally, the components of a manufacturing project are mainly tangible and intangible resources, including personnel, land, factories, tools, equipment, raw and auxiliary materials, technologies, expenses, and the like; the implementation process of the construction project of the manufacturing industry is a process of inputting and integrating various tangible and intangible resources according to a certain flow by using corresponding management methods and tools and finally converting the various resources into the target achievement of the project. Although different service lines have certain differences in specific components and construction processes due to various factors, the components do not exceed the scope of the components of the manufacturing project in general, and the construction process can be divided into a preparation stage, an implementation stage and an acceptance stage, each of which comprises a plurality of sub-processes.

1. And analyzing the structural elements of the maintenance line. The process is as follows:

1. comparative analysis of airworthiness regulations and related terms

The airworthiness regulation is a regulatory document which is made by civil aircraft authorities of various governments to ensure the airworthiness of civil aircraft, can be divided into an initial airworthiness regulation and a continuous airworthiness regulation, is part of national regulations, and must be strictly executed. The regulatory provisions for the maintenance of civil aircraft are the subject of continuous airworthiness regulations. Although continuous airworthiness regulations generally do not specify details specific to the construction and operation of aircraft engine service lines, their associated requirements are included as part of the continuous airworthiness regulations in the regulatory compliance for civil aircraft service units. In other words, any aircraft engine service line that is constructed and operated by a civil aircraft service unit should first meet the requirements of continuous airworthiness regulations. Therefore, analysis of relevant continuous airworthiness regulations facilitates better determination of the components of the service line. The invention mainly and transversely compares CCAR-145-R3' civil aircraft MAINTENANCE unit qualification rules issued by the national Aviation Administration, PART 145-Repair Station issued by the Federal Aviation Administration (FAA) and MAINTENANCE ORGANISSATION APPROVALS-PART 145 (generally called EASA-145) issued by the European Union Aviation Safety Agency (EASA).

2. Analysis of terms related to CCAR-145-R3

CCAR-145 was first issued in 1988 at 11 months, was revised three times in 1993, 2001, and 2005, respectively, and the current CCAR-145-R3 was issued in 2005 at 31 months 12. Compared with the R2 version, the R3 version mainly increases maintenance personal factors, self-made parts, labor protection, evaluation and warehousing inspection of suppliers, training outline and requirements, requirements on the working time limit of maintenance personnel and the like. The terms related to the repair line components in CCAR-145-R3 are mainly focused on items 145.20 to 145.24 which are "approval requirements of the fourth chapter of repair units", and the reflected components and their sub-components are shown in Table 1.

Table 1 list of constituent elements and their sub-elements referred to in CCAR-145-R3

In addition, according to the regulations of China civil aviation industry Standard MH/T3012-2018 civil aircraft maintenance ground maintenance facility, the engine repair operation places generally comprise: disassembling and assembling operation places, part repairing operation places and test beds; various auxiliary compartments are arranged in the plant according to the needs; the test bed factory building is generally provided with a preparation room, a test room, a control room, an auxiliary equipment room and the like; the test bed should set up oil storage tank, waste oil tank and oil pipeline. The regulations of the industry standards can also be seen as general requirements for civil aircraft engine maintenance plant facilities.

3. Analysis of terms related to PART 145-replay Station

The terms relating to Repair line components in PART 145-Repair Station are mainly focused on "PART C-house, facilities, equipment, materials and Materials (Subpart C-Housing, facilities, equipment, materials, and Data)" and "PART D-Personnel (Subpart D-person)", in which the components and their sub-components are reflected in table 2.

Table 2PART 145-replirstation related constituent elements and its sub-element table

4. Analysis of terms related to EASA-145

The terms related to service line components in the EASA-145 are mainly focused on "facility requirements (145. A. 25facilities requirements)", "personnel requirements (145. A. 30personal requirements)", "equipment, tools and equipment (145. A.40 equipment, tools and materials)" and "service data (145. A.45Maintenance data)", in which the reflected components and their sub-components are shown in Table 3.

TABLE 3EASA-145 reference Components and their sub-component tables

As can be seen from the above comparative analysis, CCAR-145-R3, PART 145-Repair Station, and EASA-145 are relatively consistent with the regulations relating to service line components. From the viewpoint of satisfying airworthiness regulatory requirements, the constituent elements should include: facilities, tools, equipment, personnel, and maintenance data.

5. Comparative analysis of maintenance line constituent elements of two domestic MRO enterprises

In addition to comparative analysis of terms relating to airworthiness regulations, it is also necessary to perform a lateral comparative analysis of a service line that has already been built and put into operation in order to better determine service line components from a construction and operational point of view. The embodiment mainly analyzes the maintenance line constituent elements of two domestic (respectively called M company and H group for short) aircraft engine MRO enterprises.

The M company is a China and foreign joint venture MRO company, passes through 20 certificates of CAAC (civil aviation administration of China), EASA, FAA and the like, has the capabilities of repairing, overhauling and on-site support of V2500 series and CFM56 series engines, and can perform complete machine and unit body decomposition and assembly, nondestructive inspection, machining, welding, plasma spraying, accessory repair and engine test. The flexible maintenance line is provided, the maintenance capacity (visit shop) is 300 pieces/year, and the customers are mainly domestic airlines in China. Since the build, cumulative service delivery aircraft engines exceeded 1350.

The H group is a national exclusive aeroengine MRO enterprise, and has the capabilities of overhauling and overhauling a plurality of models of aeroengines, technical support of an outfield, the capability of developing aeroengine parts, tools and ground detection equipment, and the capability of maintaining a plurality of civil aircraft parts. The flexible maintenance line can be used for decomposition, cleaning, fault inspection, nondestructive testing, machining, heat treatment and surface treatment, special welding and spraying, deep repair of parts, repair of accessories, assembly of the whole machine and test run of an engine, and has a plurality of flexible maintenance lines.

Comparative analysis of maintenance line constituent elements of company M and group H:

a comparative analysis of the maintenance line components and their sub-components between the M company and the H group is shown in Table 4, where "O" indicates the presence of the component and "X" indicates the absence of the component.

TABLE 4 comparative table of maintenance line components and their sub-components between company M and group H

From the above analysis, although there are some differences in the sub-elements of the repair line due to the large differences in the business strategy, the user requirement, the type of the aircraft engine under repair, the repair depth, etc. of the M corporation and the H group, the differences are generally consistent with the requirements of airworthiness regulations, that is, they include: facilities, tools, equipment, personnel, and maintenance data.

6. The fund should be a component

The airworthiness regulation makes a regulation on civil aircraft maintenance units from the perspective of ensuring the continuous airworthiness of the aircraft, so that the civil aircraft engine maintenance line is regulated and restricted, and requirements and guidance are not provided for resource investment, particularly expense investment, in the process of building and operating the maintenance line. In practice, however, the need for financial investments is implicit, since other components must be supported for the financial effort to meet the standards and conditions imposed by airworthiness regulations.

Modern aircraft engines are typical advanced technology intensive industrial products, maintenance of the modern aircraft engines is complex engineering, and various types of resources such as facilities, equipment, personnel, equipment, tools and the like need to be configured and research and development of maintenance technology is carried out, so that the construction and the equipment investment of a maintenance line are large. For example, the first line of aircraft engine maintenance by M corporation is nearly $ 2 billion for only a single project investment.

The construction expenses of the service line generally mainly include: land acquisition and related costs, construction work and related costs, tool and equipment acquisition costs, labor cost costs, training costs, authorization costs, airworthiness forensic costs, material costs, low value consumable costs, tax, financing interest, reserve costs, and the like. In the process of construction, the expense needs to be paid in stages according to the progress, and particularly in the initial stage of construction, the investment of the expense is concentrated. For example, land purchase, generally paying 90% of the total land price after signing a land discharge contract; equipment configuration, generally paying 30% -50% of the total price after signing a purchase contract; construction engineering, typically paying 30% of the total price after signing a total package contract; personnel training, which is generally to pay all expenses after the training contract is signed; the value-added tax, customs tax and other tax fees must be paid according to laws and in time in full amount. The payment delay of any link can influence the overall progress of the construction. It can be said that sufficient investment is a basic guarantee that the maintenance line construction is smoothly performed and finally the construction target is achieved.

After the maintenance line is built, the normal operation of the maintenance line still needs to be ensured by continuously investing expenses. Moreover, the repair line may change due to various factors such as adjustment of national and local policies, changes in airworthiness regulations, changes in market environment, changes in design and manufacture of aircraft engines, new requirements for aircraft engine repair by manufacturers or users, and the like. The balance of technical performance, reliability, maintainability and economy is comprehensively considered in the design process of the civil aviation engine, the advance of the technical performance is generally not simply pursued, so that once the civil aviation engine is designed and shaped and is proved to be airworthiness, the design and manufacture are rarely changed greatly, the service life of the civil aviation engine is very long, for example, an RB-211 engine developed by the Roels Roies company is put into use in 5 months 1977, the civil aviation engine is mainly installed on boeing 747, 757 and 767 airplanes and is still in service till now, and 482 engines of the civil aviation engine are used and backed up in 2016 in China. Once the maintenance line of the civil aviation engine is built, the maintenance line can not be greatly adjusted due to the design and manufacturing change of the model, and the maintenance line is optimized for the purposes of improving the productivity, reducing the cost and improving the efficiency due to the change of the market environment of MRO enterprises. The requirements of military aviation engines on economy are not strict as those of civil aviation engines, and during the service life of the military aviation engines, the military aviation engines are frequently improved and modified for many times according to the requirements of the military. For example, F110 series engines developed by general electric company, which were delivered from 1986 and are still in production so far, have derived modified engines for F-14 (F110-GE-400), B-2A (F-118-GE-100), U-2S (F-118-GE-101) and other aircraft, in addition to the models for F-15 and F-16 aircraft. The characteristics of many improvements and modifications of military aircraft engines mean that after a maintenance line is built, adjustment is probably carried out according to design, manufacturing and modification of the engines frequently, such as new building or reconstruction of facilities such as a test bed, addition of new special tool equipment, addition of technical data, retraining of maintenance personnel and the like, and the improvement and modification can be carried out without investing expenses for support.

Therefore, although the expenses cannot be visually reflected from the terms of airworthiness regulations or the established service line, they should be one of the components of the service line. In summary, the present invention considers that the components of the service line include: facilities, tools, equipment, personnel, maintenance data, and expenses.

2. Analysis of construction process

At present, national standards for maintenance line construction, national military standards or industrial standards are not issued in China, so that the research on the construction process cannot firstly analyze the requirements of the standards, and only starts from the analysis of the construction process of the established maintenance line. The method carries out longitudinal comparative analysis on the construction process of 3 maintenance lines of the H group, summarizes the rules therein and determines the construction process.

2.3.1A type aeroengine maintenance line construction process

The main construction process of the type a aeroengine maintenance line is shown in fig. 3, and includes: establishing an organization leader mechanism; determining a maintenance line and site selection; carrying out infrastructure engineering design, including maintenance of plants, test beds, oil depots, office buildings, dormitory buildings and the like; after the upper level administrative department approves the engineering design, the land is assessed and relevant procedures are handled; erecting a power transmission line; erecting a water conveying pipeline; building roads for entering and exiting a plant area; building a power station, a machining workshop, an engine repair workshop and an oil depot; configuring equipment; configuring maintenance personnel; configuring equipment; configuring a tool tooling; configuring maintenance technical data; trying to repair a first batch of engines; and identifying, accepting and paying the first engines.

2.3.1A type aeroengine maintenance line construction process

The main construction process of the type a aeroengine maintenance line is shown in fig. 3, and includes: establishing an organization leader mechanism; determining a maintenance line and site selection; carrying out infrastructure engineering design, including maintenance of plants, test beds, oil depots, office buildings, dormitory buildings and the like; after the upper level administrative department approves the engineering design, the land is assessed and relevant procedures are handled; erecting a power transmission line; erecting a water conveying pipeline; building roads for entering and exiting a plant area; building a power station, a machining plant, an engine repair plant and an oil depot; configuring equipment; configuring maintenance personnel; configuring equipment; configuring a tool tooling; configuring maintenance technical data; trying to repair a first batch of engines; and identifying, accepting and paying the first engines.

The maintenance line of the A-type aircraft engine is the first maintenance line constructed by the H group, the construction process of the maintenance line is actually mutually blended with the construction process of the H group, so that the expenditure and the time investment of infrastructure construction are relatively high, and in the aspects of equipment, maintenance personnel, equipment, tool equipment, maintenance technical data configuration and trial maintenance of first-batch engines, the expenditure investment is relatively low and the progress is relatively fast due to the support of other MRO enterprises in China.

2.3.2B type aeroengine maintenance line construction process

The main construction process of the type B aeroengine service line is shown in fig. 4, and includes: establishing an organization leader mechanism; establishing a maintenance line construction scheme and approving the maintenance line construction scheme through a superior competent department; configuring maintenance technical data including product drawings, process rules, aviation material catalogues, tooling drawings, equipment drawings and the like; configuring a tool tooling; configuring non-standard equipment; configuring equipment; training maintenance personnel; transforming a test bed; trying to repair a first batch of engines; and (5) identifying, accepting and delivering the first engine.

Because the construction of basic facilities such as land acquisition, maintenance plants, test beds and the like is already completed in the construction process of the A-type aircraft engine maintenance line, the main work related to the basic facilities is to modify the test beds in the construction process of the B-type aircraft engine maintenance line, the investment cost is relatively low, and the used time is also short. The B-type aeroengine and the A-type aeroengine have great similarity in the aspects of structure, material and the like, so that special tool tools and equipment are configured on the tool tools and equipment mainly aiming at the maintenance difference items and the requirement for forming the maintenance capability of the B-type aeroengine accessories. In the aspect of personnel training, technicians and maintenance personnel are trained mainly aiming at the maintenance difference items of the two types of aeroengines. In general, the investment cost and the construction period of the B type aircraft engine maintenance line are obviously less than those of the A type aircraft engine maintenance line.

2.3.3C type aeroengine maintenance line construction process

The main construction process of the type C aeroengine service line is shown in fig. 5, and includes: establishing an organization leader mechanism; configuring maintenance technical data; establishing a maintenance line construction scheme and examining and approving the maintenance line construction scheme through a superior competent department; newly building and modifying a maintenance workshop; newly building and modifying a test bed; newly building a power transmission line; training personnel; configuring a special tool, a tool, equipment and a test bench for repairing accessories; configuring a tool, a tool and equipment special for repairing the complete machine; configuring mechanical processing equipment; configuring a heat treatment and surface treatment device; configuring equipment; configuring part deep repair equipment and test equipment; trying to repair the first batch of accessories; identifying and delivering the first lot of accessories; trying to repair a first batch of engines; the first engine is identified and delivered.

When the H group carries out the construction of the C-type aeroengine maintenance line, the H group also undertakes the batch maintenance tasks of other models, the original maintenance factory building is saturated, and the newly-built and transformed maintenance factory building and the test bed become the essential links for the construction of the maintenance line. The design, structure, material, manufacturing process and other aspects of the C-type aircraft engine are greatly different from those of various aircraft engines which are repaired before the H group, so that tools, tools and equipment which are configured on a repair line built by the H group cannot meet the repair requirement except a few general types, and therefore a large number of special tools, tools and equipment must be configured. Under the influence of various factors, the purchase of new aviation materials of the C-type aircraft engine is difficult for a long time and is a main bottleneck problem influencing the realization of the construction target of the maintenance line, and the H group must be provided with more parts machining and deep repair equipment to improve the self-making capability and the deep repair capability of the parts, so that the dependence on the purchase of the new aviation materials is reduced. Under the conditions, compared with the maintenance lines of the aeroengine A and the aeroengine B, the construction process of the maintenance line of the aeroengine C has the same parts and the characteristics, the investment of construction cost is larger, and the construction period is longer.

2.3.4 construction Process and subprocess of maintenance line

The construction process of the maintenance line of the aero-engine can be summarized by analyzing the construction process of the maintenance lines of the aero-engine of the types A, B and C of the H group, as shown in fig. 6, the construction process of the maintenance line of the aero-engine can be generally divided into a preparation stage, an implementation stage and an acceptance stage, and each stage respectively comprises a plurality of sub-processes.

The preparation phase comprises the following steps: after the strategic decision of the maintenance line construction is formed, the MRO enterprise should firstly form an organization leader mechanism which is fully responsible for all work of the maintenance line construction. And carrying out feasibility demonstration, wherein the organization leader organization is responsible for organizing and implementing, and the method mainly comprises basic conception or summary of maintenance line construction projects, market and competitive environment analysis, maintenance line construction preliminary scheme, financial analysis, benefit analysis, risk analysis and the like. The configuration and maintenance technical data mainly comprise configuration airworthiness seal, design files provided by OEM, maintenance manuals or guides, technical files such as special tool equipment drawings and the like, and related technical files provided by users. Establishing a maintenance line construction scheme, specifically designing and arranging factors and configurations such as land acquisition, capital construction, tool and tool equipment, personnel and the like according to maintenance technical data on the basis of a primary construction scheme in feasibility demonstration, and compiling detailed budget for funds; the maintenance line construction scheme can be transferred to an implementation stage after being approved by a superior administrative department or a shareholder party of the MRO enterprise. In the preparation stage, each subprocess is a prerequisite link of the next subprocess, and the subprocesses are in serial relation with each other.

The implementation stage comprises: the construction fund of the maintenance line is raised, and the fund demand is solved through the modes of superior main pipe part money transfer or investment of stockholders, enterprise self-raising, introduction of strategic investment and the like according to the fund budget provided by the construction scheme. Land acquisition, namely signing an investment agreement and a land giving contract with a government competent department for constructing and selecting a site of a maintenance line to obtain a land certificate; and designing and constructing the infrastructure, namely completing the design and construction of the infrastructure such as a maintenance workshop, a test bed, an oil storage facility, a marine material warehouse and the like according to the construction land condition and the maintenance line process layout. And configuring tools, tools and equipment, and finishing the configuration of the tools, the tools and the equipment by outsourcing, self-making, renting, borrowing and the like. And (3) equipment is configured, and the configuration of aeronautical materials, auxiliary materials, raw materials, labor protection products and the like is completed in a mode of outsourcing, self-making and the like. And the configuration personnel configure management, maintenance, release, support personnel and the like through internal adjustment, external recruitment and other forms, and complete training, evidence collection and authorization. In the implementation stage, all sub-processes are mainly in a parallel relationship, and all works can be synchronously carried out after the construction expenditure of the maintenance line is solved.

The acceptance stage comprises: the higher-level department of charge reviews, mainly MRO enterprise's higher-level department of charge or airworthiness main pipe door, carries on the on-the-spot review to the completion condition of each subprocess of implementing stage, can transfer to the first (batch) engine maintenance after examining. After the maintenance is finished, the special identification needs to be carried out on the maintenance process of the first (batch) engine, the engine can be delivered after the identification, and the maintenance line is marked to finish the construction. In the acceptance stage, each subprocess is a precondition of the next subprocess, and the subprocesses are in a serial relationship with each other.

3. Analysis of importance of constituent elements

By using an expert scoring method, 7 experts are invited from the H group, and the following components are added: facilities, tools, equipment, personnel, maintenance data, and expenses. Generally, when the expert scoring method is used, the method should surround the evaluated object and be scored by the expert independently, the scoring of each round of feedback should be summarized and analyzed by the organizer of the expert scoring, and then the scoring is provided to the expert as the reference for the next round of scoring; and repeating the steps for a plurality of times until a stable score is obtained. Considering that the purpose of the expert scoring method is to determine the importance of the maintenance line constituent elements, the complexity is relatively low, and all invited experts come from an H group, so that E-mails of the scoring table are sent firstly, and 7 experts score the maintenance line back to back; secondly, on the premise of communicating clear scoring rules with invited experts, only one round of relative weight scoring of the constituent elements is carried out, and then the experts score the importance degrees of the constituent elements by one round in combination with a five-level scoring method; finally, the importance value of the constituent element is obtained through weighting calculation.

2.3.1 determining the relative weights of the constituent elements

The relative weight w of the maintenance line constituent elements is independently judged and proposed by 7 experts _j And satisfies Σ w _j ＝1(0<w _j <1) The relative weights of the components collected from experts are arithmetically averaged to obtain the relative weights of the components, as shown in table 6.

Table 6 relative weight value table of constituent elements

	Facility	Tool with a locking device	Device	Equipment	Person(s)	Maintenance data	Expenses of money
								Expert 1	0.13	0.09	0.13	0.13	0.10	0.28	0.14
Expert 2	0.15	0.05	0.1	0.16	0.08	0.33	0.13
								Expert 3	0.15	0.1	0.15	0.15	0.1	0.25	0.1
Expert 4	0.11	0.05	0.14	0.12	0.18	0.09	0.31
								Expert 5	0.17	0.05	0.16	0.07	0.08	0.2	0.27
Expert 6	0.1	0.09	0.2	0.08	0.19	0.08	0.26
								Expert 7	0.06	0.11	0.18	0.11	0.17	0.22	0.15
Mean value of	0.12	0.08	0.15	0.12	0.13	0.21	0.19

2.3.2 determining importance of Components

With the five-level scoring method, the importance of the constituent elements is 1-5 as the evaluation score, 1 is not important, 2 is general, 3 is important, 4 is very important, and 5 is very important. The importance degree is scored by 7 experts, and then multiplied by the relative weight to obtain the importance degree value of the constituent elements. The model is as follows:

M _j ＝∑w _j M _ij

wherein, M _j Is the integrated value of credit, w, of the jth element _j Is the relative weight of the jth element, M _ij The ith expert scores the importance degree of the jth element and calculates the importance degree value of the constituent elements, and the constituent elements are sorted according to the importance degree value from large to small as shown in the table 7: maintenance data (5.88), expenses (5.32), equipment (3.60), personnel (3.25), equipment (2.76), facilities (2.04), tools (1.28).

Table 7 table of importance values of constituent elements

The sorting result of the components according to the magnitude of the importance degree is matched with the actual situation. Maintenance materials, particularly service manuals, major repair guides, service letters, technical notices, etc. provided by OEMs, have a significant impact on the service line construction process, and expenses, equipment, personnel, equipment, facilities and tools are configured and function around the requirements of the maintenance materials. Changes in the maintenance data will affect other factors to a different extent, such as possible equipment improvement or addition, retraining of personnel, equipment stocking adjustment, facility modification, and tool updating; the maintenance data is not only the constituent elements of the maintenance line, but also the main basis for the construction and improvement of the maintenance line. The construction cost investment of the maintenance line is large, and the continuous investment cost is needed for keeping running, expanding or upgrading after the maintenance line is built; all other components can not be used as support when functioning normally; therefore, MRO enterprises should ensure adequate investment, both during the construction of the service line and during operation after construction.

4. Importance analysis of construction processes

The maintenance line construction process is a combination of activities that reasonably arrange the constituent elements and make them play a role. According to the analysis result of the construction process, the construction process should include the following sub-processes: the method comprises the steps of establishing and organizing a leader organization, carrying out maintenance line construction feasibility demonstration, configuring maintenance technical data, establishing a maintenance line construction scheme, examining and approving a higher-level department in charge, financing maintenance line construction expenses, expropriating land, designing and constructing infrastructure, configuring tool tools and equipment, configuring personnel, examining a higher-level main pipe gate, maintaining a first (batch) engine, identifying and delivering the first (batch) engine.

In general, the importance of each sub-process can be analyzed from both the time and expense dimensions. In general, the more important the sub-process is, the longer it takes to perform it and the greater the financial investment. For example, the maintenance line needs a large number of tool fixtures and equipment, so that the total input expense is high, and the delivery period of part of complicated and precise equipment is long. However, there are exceptions, such as the maintenance line construction needs to be carried out first to settle the expenses, but the maintenance line construction expenses are generally scheduled to be shorter, and the financial expenses are also lower. Therefore, it is necessary to first invite an expert to determine the relative weights of the sub-processes; then determining the importance degree through two dimensions of time and expense; and finally, obtaining an importance value through weighting calculation.

2.4.1 determining the relative weights of the sub-processes

Inviting H group 7 experts to independently judge and put forward relative weight k of each subprocess _j And satisfies Σ k _j ＝1(0<k _j <1) The relative weights of the sub-processes recovered from the experts are arithmetically averaged to obtain the relative weight, see table 8.

TABLE 8 tables of relative weight values for each sub-process

2.4.2 determining importance scores for sub-Processes

The sub-processes are analyzed from two dimensions of time and expense to determine the importance degree of the sub-processes, the method is to calculate the sub-processes of the construction of the two maintenance lines of the M company and the H group one by one according to the model, and the result is shown in a table 9.

N _i ＝∑(T _i /T+M _i /M)/2

Wherein N is _i Is the importance score, T, of the first sub-process _i For the implementation time of the ith sub-process, T is the total time for the maintenance line construction to be implemented, M _i And M is the total expense invested in the construction of the maintenance line.

TABLE 9 table of importance degree scores of each sub-process

2.4.3 determining importance values for sub-Processes

According to the model: s _i ＝100N _i k _j Performing weighted calculation to obtain importance value of each sub-process, wherein S _i The importance of the ith sub-process is multiplied by 100 to facilitate comparison of the calculated values, and the results are shown in Table 10.

TABLE 10 importance value Table for each subprocess

Sub-process	Ni	Kj	Si
				Organization leader mechanism	0.07	0.07	0.49
Demonstration of construction feasibility of maintenance line	0.24	0.09	2.16
				Configuring maintenance technical data	0.24	0.14	3.36
Establishment scheme for establishing maintenance line	0.15	0.1	1.50
				Higher level administrative department examination and approval	0.08	0.06	0.48
Financing maintenance line construction cost	0.29	0.1	2.90
				Land seeking	0.26	0.03	0.78
Infrastructure design and construction	0.6	0.08	4.80
				Configuration tool tooling and equipment	0.83	0.11	9.13
Configuration equipment	0.24	0.05	1.20
				Arrangement personnel	0.21	0.03	0.63
Higher level administrative department review	0.07	0.02	0.14
				First (batch) engine maintenance	0.09	0.08	0.72
First (batch) engine identification and delivery	0.06	0.03	0.18

The sub-processes are sorted from big to small according to the importance degree value as follows: the method comprises the steps of configuring tool tools and equipment (9.13), designing and constructing infrastructures (4.80), configuring maintenance technical data (3.36), financing maintenance line construction expenses (2.90), conducting maintenance line construction feasibility demonstration (2.16), formulating a maintenance line construction scheme (1.50), configuring equipment (1.20), expropriating land (0.78), first (batch) engine maintenance (0.72), configuring personnel (0.63), establishing organization leadership mechanism (0.49), higher-level department of charge examination and approval (0.48), first (batch) engine identification and delivery (0.18) and higher-level department of charge examination and approval (0.14). In the preparation stage, the implementation stage and the acceptance stage, the maximum importance values of the sub-processes are respectively as follows: configuration maintenance technical data (3.36), configuration tool tooling and equipment (9.13) and initial (batch) engine maintenance (0.72).

The sorting results of all the subprocesses according to the magnitude of the importance degree are matched with the actual situation. The two sub-processes of tool tooling equipment configuration, basic equipment design and construction need longer period and more investment, so in the link of establishing a maintenance line construction scheme in the preparation stage, relevant work needs to be done, such as development of model selection research of the tool tooling equipment, design of maintenance line process layout and the like, so as to reduce the preparation time in subsequent implementation. In the implementation stage, the configuration form comprises lease, self-making and purchase, wherein the configuration form comprises internal management of an MRO enterprise and management of an external supplier and a supply chain; for some devices with important functions and high price, such as test run testing devices, demonstration research is needed, public bidding and the like are carried out, and the method has multiple links and long process; in the design and construction process of the infrastructure, the works such as construction planning declaration, construction permission declaration, environmental impact evaluation, safety impact evaluation, fire control permission and the like need to be examined and approved by a plurality of government departments, the period is long, and design change or construction rectification is probably needed according to the evaluation results of government related departments; from the perspective of single-item cost investment, infrastructure design and construction are often the most costly items to invest in maintenance line construction. In addition, the most important subprocess in the preparation stage is to configure the maintenance technical data, which is consistent with the status of the maintenance data in the maintenance line constituent elements; the most important subprocess in the acceptance stage is the maintenance of the first (batch) engine, and is the direct inspection of whether the whole maintenance line can ensure that the maintained aircraft engine meets the technical requirements.

The regulations on facilities, tools, equipment, personnel and maintenance data for aircraft maintenance in the civil aircraft continuous airworthiness regulations issued by the national aviation administration, the united states federal aviation administration and the european union aviation safety administration can be regarded as requirements on maintenance line components from the perspective of civil aviation regulations. The constituent elements of the built maintenance line of the M company and the H group in China are basically consistent with the regulations of the civil aviation laws. The expense is indispensable for the construction of the service line and should be a component of the service line. Although relevant laws and standards for the construction of the maintenance line are not issued in China, the construction processes of the maintenance lines of different models are basically the same by researching the construction process of the maintenance line built by the H group. The importance of each component and each subprocess of the repair line is obviously different. To solve the efficiency evaluation problem, the conversion from qualitative evaluation to quantitative evaluation of the importance of each constituent element and each subprocess should be realized first, so as to lay a foundation for establishing an evaluation model and implementing evaluation by using an analytic hierarchy process. The expert scoring method and the five-level scoring method are common methods for converting qualitative evaluation into quantitative evaluation, and the quantitative research on the importance degree of each constituent element and each subprocess is completed by combining the expert scoring method and the five-level scoring method.

Example two:

in the first embodiment, the construction efficiency is quantitatively evaluated mainly in consideration of the interrelation between each constituent element and each subprocess. The maintenance line construction efficiency evaluation is a comprehensive evaluation on construction effect and efficiency, and the effect can be defined as the coincidence degree of the final result of construction and a target; efficiency may be defined as the degree of conformance of a construction process to a benchmark process. Therefore, the invention establishes a maintenance line construction efficiency evaluation model by using the thought and the method of the analytic hierarchy process and provides an evaluation method. The implementation process of this embodiment is as follows:

3.1 Overall Structure of maintenance line construction efficiency evaluation model

By referring to the hierarchical structure model in the AHP, a maintenance line construction efficiency evaluation model is established, as shown in fig. 7, which includes a target layer, an element layer, a process layer, and an index layer. The construction of a target layer, namely a maintenance line, can achieve the aims of high quality, short period and low cost; the element layer comprises 7 components of maintenance data, expenses, equipment, personnel, equipment, facilities and tools; the process layer comprises 14 subprocesses of establishing an organization leader mechanism, performing maintenance line construction feasibility demonstration, configuring maintenance technical data, making a maintenance line construction scheme, examining and approving by a higher-level department of charge, financing maintenance line construction expenses, expropriating land, designing and constructing infrastructure, configuring tool tools and equipment, configuring personnel, examining by the higher-level department of charge, maintaining a first (batch) engine, identifying the first (batch) engine and delivering; the index layer is the evaluation index provided for each sub-process, and the total number of the index layers is 28, the main responsible person of the maintenance line construction adjusts the passing rate of the human number, the subjective department review feasibility demonstration report, the maintenance technical data call-in rate, the maintenance technical data update timeliness rate, the maintenance technical data conversion review one-time passing rate, the governing department review maintenance line construction scheme passing rate, the maintenance line construction scheme target and maintenance line construction result coincidence rate, the approval maintenance line construction scheme and time rate, the maintenance line construction cost in-place timeliness rate, the maintenance line construction cost execution rate, the expropriation scale and maintenance line construction scheme coincidence rate, the bare-sible evidence obtaining time and maintenance line construction scheme coincidence rate, the infrastructure new construction or reconstruction completion timeliness rate, the infrastructure and maintenance technical data requirement coincidence rate, the infrastructure and airworthiness regulation and other regulatory requirement coincidence rate, the equipment in-place rate, the equipment and maintenance technical data requirement coincidence rate, the equipment and airworthiness regulation and other regulatory requirement coincidence rate, the tool and equipment in-place rate, the equipment and airworthiness regulation and other regulatory requirement coincidence rate, the equipment requirement and the first maintenance platform use rate (first airworthiness) of the maintenance platform and maintenance platform (first airworthiness) requirement and the maintenance platform use of the maintenance platform (first maintenance platform) of the maintenance platform and the maintenance platform.

3.2 calculate Performance evaluation model ranking weights

The method for calculating the maintenance line construction efficiency evaluation model ranking weight by using the yaahp12 software full version comprises the following steps:

3.2.1 building a hierarchical model

And establishing a maintenance line construction efficiency evaluation hierarchical structure model in yaahp12 software according to the maintenance line construction efficiency evaluation model.

After the hierarchical structure model is established, yaahp12 software automatically judges the rationality of the model, unreasonable content in the model is displayed in an output column below a model interface, and at the moment, the model needs to be adjusted until no unreasonable content is displayed in the output column.

3.2.2 establishing a target layer-element layer judgment matrix

After the maintenance line construction efficiency evaluation hierarchical structure model is established, yaahp12 software automatically generates a target layer-element layer judgment matrix, and at the moment, the relative importance among elements of the element layer needs to be input. In the first embodiment, the importance values of the components are obtained, the relative importance between the components can be conveniently calculated, and the calculation result retains two digits (rounded off in the third digit) after the decimal point, for example, the relative importance of "personnel" to "maintenance data" is 3.25/5.88=0.55, and the target layer-component layer judgment matrix of the relative importance is filled.

After the relative importance is filled in, yaahp12 software automatically judges the integrity and consistency of the target layer-element layer judgment matrix, if the target layer-element layer judgment matrix has unreasonable content, the target layer-element layer judgment matrix is automatically displayed in an output column below a matrix interface, and inconsistency is displayed in a judgment matrix consistency column. The reason why there is unreasonable content is generally that the relative importance value between the constituent elements does not comply with the relative importance calculation rule in AHP. After the relative importance values among the constituent elements are filled in according to the analysis result of the first embodiment 2, the column "output" shows no unreasonable content, and the column "judgment matrix consistency" shows "consistency", which indicates that the target layer-element layer judgment matrix has no unreasonable content.

3.2.3 establishing element layer-Process layer decision matrix

After the maintenance line construction efficiency evaluation hierarchical structure model is established, yaahp12 software automatically generates a target layer-element layer judgment matrix and an element layer-process layer judgment matrix at the same time, wherein each constituent element respectively and automatically generates a judgment matrix according to the hierarchical structure model and related sub-processes, and the relative importance degree between the sub-processes needs to be respectively input by the judgment matrix one by one. In the first embodiment, the importance value of each sub-process is already obtained, the relative importance between each sub-process can be conveniently calculated, and the calculation result retains two digits (rounded off in the third place) after the decimal point, for example, the relative importance of "the organization leader" for "performing maintenance line construction feasibility demonstration" is 0.49/2.16=0.23.

After the relative importance is filled in, yaahp12 software automatically judges the integrity and consistency of the element layer-process layer judgment matrix one by one, if unreasonable content exists in the element layer-process layer judgment matrix, the element layer-process layer judgment matrix is automatically displayed in an output column below a matrix interface, and inconsistency is displayed in a judgment matrix consistency column. The reason why there is unreasonable content is generally that the relative importance value between the sub-processes does not comply with the relative importance calculation rule in the AHP. After the relative importance values among the sub-processes are filled in according to the analysis result of the first embodiment, unreasonable contents are not displayed in the column of "output", and "consistency" is displayed in the column of "judgment matrix consistency", which indicates that unreasonable contents do not exist in the judgment matrixes of the element layer and the process layer.

3.2.4 output the calculation results

After the steps of 3.2.1-3.2.3 are completed, the yaahp12 software automatically outputs the calculation result, the rule is to calculate and output the sequencing weight of the process layer to the target layer at first, and the sequencing weight of the process layer to the target layer displayed by the bar chart, the bar chart or the pie chart can be selected respectively.

By selecting the 'export data', all the ranking weights of the maintenance line construction efficiency evaluation model can be output in a PDF format or an Excel format, and the ranking calculation results of the judgment matrix weights of each element layer-process layer are respectively shown in tables 11 to 17.

TABLE 11 table of calculation results of the personnel's weight ranking of the element layer-process layer decision matrix of the related sub-processes

TABLE 12 maintenance data to element layer-Process layer decision matrix weight ranking calculation result Table of the associated sub-Process

TABLE 13 calculation result table of element layer-process layer judgment matrix weight ranking of cost versus associated subprocess

TABLE 14 element layer-Process layer decision matrix weight ordering calculation result table of device to related subprocess

TABLE 15 element layer-Process layer decision matrix weight ordering calculation result table of device to related sub-Process

TABLE 16 element layer-Process layer decision matrix weight ranking calculation results table for facility-to-related subprocesses

Table 17 calculation result table for ranking the element layer-process layer judgment matrix weight of the related sub-process by the tool

3.3 Performance evaluation method

By establishing an efficiency evaluation model, the sequencing weight value is calculated by utilizing yaahp12 software and is used as a standard for evaluating the construction efficiency. When the construction efficiency needs to be evaluated, the method comprises the following steps:

a) And (3) by using an expert scoring method, inviting not less than 7 experts to score each component according to the method in the first embodiment and calculate the importance value of the component according to the construction condition of the maintenance line.

b) Inviting the same group of experts in a) to score each sub-process and calculate the importance value according to the method in the first embodiment.

c) And (4) establishing a maintenance line construction efficiency evaluation model to be evaluated by using yaahp12 software, and adjusting the model to be reasonable according to software prompts.

d) And (3) establishing a target layer-element layer judgment matrix and an element layer-process layer judgment matrix by using yaahp12 software, and adjusting the matrixes to be reasonable according to software prompts.

e) And calculating the sequencing weight values of the element layer to the target layer, the process layer to the target layer and the process layer to the element layer by using yaahp12 software.

f) Comparing the sorting weight value obtained in the step e) with the sorting weight value in the evaluation standard, analyzing the deviation degree, and the lower the deviation degree, the better the construction efficiency.

g) If the construction efficiency of a plurality of maintenance lines needs to be compared, all sequencing weight values of each maintenance line of the aero-engine to be evaluated are calculated according to a) -e), and are compared with the sequencing weight values in 3.2.4, and the construction efficiency is better if the deviation degree is lower.

3.4 efficiency evaluation model and application of method

In 2017, a group H and a company S jointly implement the construction of a P-type APU maintenance line, and an efficiency evaluation model and method are used for guiding the construction of the maintenance line, which are mainly embodied in the following aspects:

3.4.1 determining Components and resource investments

The performance evaluation model provides that the components of the maintenance line include facilities, tools, equipment, personnel, maintenance data and expenses. Accordingly, the H group and the S company determine the components and resource investment of the maintenance line of the P-type APU. In the aspect of facilities, the problem that a workshop required for realizing the first-stage construction target is subjected to adaptive transformation by using the existing maintenance workshop of the H group is solved; and the factory building required for realizing the second-stage construction target is solved by adopting a mode of levying land in the L comprehensive bonded area and newly building the factory building. In the aspects of tools and equipment, the method adopts the mode of H group lending and synchronous purchasing to the supplier appointed by OEM. On the equipment side, the solution is purchased from the OEM and its designated supplier. On the personnel side, the manager is assigned by group H and company S, and the maintenance personnel, the release personnel, the maintenance support personnel and the technician are assigned by group H. And in the aspect of maintenance materials, the maintenance materials are provided by the OEM according to the signed technical support protocol. In the aspect of expenditure, the construction expenditure of the maintenance line is paid by H group and S company together, and local government also provides part of industry policy capital support.

3.4.2 guide the construction Process

The H group and the S company determine the construction process of the maintenance line of the P-type APU by using research results, and adjust a plurality of links according to the actual conditions, as shown in FIG. 8.

The construction process of the P-type APU maintenance line is basically consistent with the research result, wherein individual links are adjusted. According to the approval authority, the related feasibility demonstration report and the construction scheme for the construction of the maintenance line can be approved and approved by the H group and the S company respectively without the approval of the upper-level department, so that the approval link of the upper-level department is adjusted to be approved and approved by the H group and the S group. Because the maintenance line building personnel are respectively delegated by the H group and the S company, the delegated personnel are in place after the construction cost is solved, and the configuration personnel are advanced to other links in the implementation stage. According to the government regulations of the site of the newly-built maintenance factory building, the subsequent land acquisition and infrastructure design and construction can be carried out only by signing an investment agreement, so that a link of signing the investment agreement with a local government is added. Since the P-type APU is civil and needs to be inspected by the civil aviation airworthiness department, the inspection link of the upper department in the acceptance stage is adjusted to be inspected by the airworthiness department. In order to reduce the risk and ensure the maintenance quality of the whole machine, before the first whole maintenance, the aeronautical materials of part numbers are repaired and delivered for use through identification, so that the first aeronautical material maintenance link is added in the acceptance stage.

3.4.3 aid in construction decision making

In the process of constructing the P-type APU maintenance line, particularly in two links of feasibility demonstration and construction scheme making, research results are used for assisting construction decisions. Taking the address selection decision about the newly built plant in the construction scheme as an example. The first phase of the maintenance line construction aims to form the overhaul capacity; the second phase target is to develop a 100 station/year overhaul capacity. Because the area of the existing factory building can not meet the second stage target, the factory building needs to be newly built selectively. In practice, according to research results, the determination of the site selection of a newly-built factory building is a component for making a construction scheme, and is also one of the preconditions for signing an investment agreement, land acquisition, infrastructure design and construction with a local government, and yaahp12 software is used for assistance in site selection decision.

The target layer of the site selection decision is 'low maintenance factory whole life cycle cost', the criterion layer is 'low land collection cost', 'short land collection cycle' and 'low tax cost', and the scheme layer is 'site selection in an L comprehensive bonded area', 'site selection in an L free trade area', 'site selection in an L area of C city', and 'site selection in a P area of C city'. According to the conditions of land collection expense, land collection period and tax collection cost which are researched and learned from relevant local governments, a target layer-criterion layer judgment matrix and a criterion layer-scheme layer judgment matrix are filled, a calculation result is obtained, and the scheme that the address is in the L comprehensive bonded area is optimal.

According to the calculation result, the H group and the S company have renegotiation with the L comprehensive bonded area administrative department, so that better results are obtained in the aspects of reducing the land gathering cost, land gathering period, tax cost and the like, and policy supports such as loan interest, investment subsidy, supporting fund and the like of the L comprehensive bonded area are obtained, and the policy supports are put into place year by year after the factory building is started and constructed, so that the life cycle cost of a newly-built factory building is effectively reduced.

In this embodiment, yaahp12 software is used, and the ranking weight of the performance evaluation model is calculated as an evaluation criterion by using the analysis result of the embodiment on each constituent element and each subprocess importance; when the efficiency evaluation is specifically carried out, the construction efficiency evaluation of the target maintenance line is completed according to the steps of calculating the importance of each constituent element and each subprocess, establishing an efficiency evaluation model, calculating a sequencing weight value and analyzing the deviation of the sequencing weight value and an evaluation reference. In practice, the efficiency evaluation model and the method are used for guiding the construction of the maintenance line of the P-type APU, and a good effect is achieved.

Example three:

in this embodiment, the efficiency evaluation is mainly performed on the maintenance line construction sub-process, and the specific evaluation process is as follows:

4.1 subprocess evaluation index:

4.1.1 preparation phase sub-process evaluation index:

4.1.1.1 maintenance line construction the main responsible person adjusts the number of people

The index is an arithmetic value of the main responsible person adjusting the number of people, and if the main responsible person adjusts for 3 times in sequence during the construction period, the numerical value is 3. The MRO enterprise implements the construction of the maintenance line by establishing an organization leader and giving it corresponding responsibility and right. In practice, the organization leader may adopt either a loose structure of a full-time core team + a part-time support team or a compact structure implemented by the full-time team. Regardless of the structural form adopted, the principal responsible person should remain relatively stable. This is because the maintenance line construction is a complicated engineering activity, and the change of the main responsible person will probably bring about the adjustment in the aspects of the working idea, the working method, the working standard, etc., and if the frequent change of the main responsible person occurs, it will have a great influence on the maintenance line construction. The ideal situation is that after the main responsible person is appointed, no adjustment is carried out during the construction of the maintenance line, namely the number of people is adjusted to be 0.

4.1.1.2 department in charge of review feasibility demonstration report passing rate

The index calculation method comprises the following steps: pass rate = (1/number of reviews before the department in charge approves the feasibility demonstration report) × 100%. The feasibility demonstration report is a general demonstration of a maintenance line construction project, and needs to carry out detailed demonstration on aspects such as target model aeroengine maintenance market conditions, the necessity, feasibility and economy of constructing the maintenance line, construction targets, main processes and work arrangement, risks, response measures and the like. The approval of the feasibility demonstration report by the superior competent department is a premise that the construction of the maintenance line can be formally started and resource support can be obtained. In practice, the upper authorities generally organize the relevant experts to review the feasibility demonstration report, and the review by the experts is a prerequisite for approval. The ideal situation is that the higher competent department organization takes 1 evaluation, and the approved item certificate report is passed, namely the passing rate is 100%.

4.1.1.3 repair data call-in rate

The index calculation method comprises the following steps: the call rate = (number of actually called maintenance technical data/number of maintenance technical data to be called) × 100%. The repair technical data generally comprises a repair manual, an inspection manual, an overhaul manual, a maintenance manual, a working range manual, a technical consultation notice, a technical service notice, a technical instruction and the like. Typically, a full set of service specifications is provided by the OEM after signing up for the corresponding service authorization or technical support agreement. Ideally, the maintenance line construction unit calls all the required maintenance technical data from the research and manufacturing unit, i.e. the call-in rate is 100%.

4.1.1.4 maintenance technical data update timeliness

The index calculation method comprises the following steps: update timeliness = (number of updated maintenance technical data actually acquired during maintenance of first engine (batch)/number of updated maintenance technical data of development unit during maintenance of first engine (batch)) x 100%. Since the maintenance line construction generally needs to last for several years, during this period, the development organization may update the maintenance technical data according to the improvement condition, the use condition and the maintenance condition of the aero-engine of the target model and the requirements of the airworthiness governing department, and transmit the updated maintenance technical data to the maintenance line construction organization in a proper form. Ideally, when the first (batch) engine is maintained, the maintenance line construction unit has acquired all the updated maintenance technical data, i.e. the update timeliness is 100%.

4.1.1.5 maintenance technical data conversion review one-pass rate

The index calculation method comprises the following steps: one-time pass rate = (number of one-time pass parts reviewed by maintenance technical data compiled by maintenance line construction unit/total number of compiled parts) × 100%. Most of the repair technical data called by a repair line construction unit from OEM can be directly adopted, and meanwhile, the called repair technical data needs to be refined, supplemented and perfected from the actual situation, in particular, various manuals are converted into repair work single cards, tool and tool equipment substitutes, equipment substitutes and the like, and the work needs to be automatically organized and completed by the repair line construction unit. After the conversion of the maintenance technical data is completed, an external expert generally needs to be invited to review the maintenance technical data to determine the compliance and the effectiveness of the maintenance technical data. The ideal situation is that the maintenance technical data compiled by the maintenance line construction unit passes through all 1 times of review, namely the one-time pass rate is 100%.

4.1.1.6 department in charge of inspection and maintenance line construction plan pass rate

The index calculation method comprises the following steps: the review pass rate = (1/number of reviews before the upper competent department approves the maintenance line construction plan) × 100%. The construction scheme is that on the basis of the feasibility demonstration report, the overall arrangement of maintenance line construction needs to make clear the target of maintenance line construction, the target, resources, plan, control, personnel division, evaluation and punishment, risk, countermeasure and other contents in the scheme. Construction can only be started after the construction scheme is approved by the upper-level department of charge. In practice, the upper administrative department will generally organize the relevant experts to review the construction project, and the review by the experts is the prerequisite for approval. The ideal situation is that the superior department of charge organizes 1 time of review, and the construction scheme is passed, namely the passing rate is 100%.

4.1.1.7 coincidence rate of maintenance line construction scheme target and maintenance line construction result

The index calculation method comprises the following steps: the compliance rate = (actual serviceability/serviceability target + construction period target/actual construction period + cost investment target/actual cost investment) × 0.33 × 100%. Generally, the construction scheme can provide targets from the aspects of maintenance capacity, construction period and expense investment according to the principle of high quality, short period and low cost. In the construction process, due to the influence of various objective factors, a certain deviation exists between the construction target and the result, and the ideal conditions are that the capacity reaches the standard, the period is not prolonged, the expenditure is not exceeded, the construction target is basically consistent with the result, and the coincidence rate is about 100%.

4.1.1.8 approval maintenance line construction scheme timeliness rate

The index calculation method comprises the following steps: the timeliness rate = (number of planned completed approval months/number of actual completed approval months) × 100%. The timeliness rate is an evaluation index of the examination and approval work efficiency of the superior department in charge and is different from an evaluation object of the index of the 'inspection maintenance line construction scheme passing rate' of the department in charge. After the construction scheme is submitted formally, the superior competent department notifies the maintenance line construction unit of the arrangement of the review and approval work, wherein the time node for completing the approval should be determined. The time for actually completing the examination and approval is less than or basically equal to the time for planning to complete the examination and approval, and the timeliness rate is about 100%.

4.1.2 evaluation index of sub-process in implementation stage

4.1.2.1 in-place timeliness rate of construction cost of maintenance line

The index calculation method comprises the following steps: and the timeliness rate = (first expense arrival planned month/actual month + second expense arrival planned month/actual month + \ 8230; \ 8230; + nth expense arrival planned month/actual month) × (100%/N). The construction cost investment is large, and the sources are not single, but comprise various sources such as self-owned funds of maintenance line construction units, capital support of superior administrative departments or governments, loan of financial institutions such as banks and the like, securities market financing, risk investment and the like. Due to the influence of factors such as financing cost and the like, construction expenses are generally not put in place in full at one time, but a planning plan of each expense is determined in a construction scheme, the putting-in-place time is determined, and then the expenses are put in place one by one according to the construction progress. The ideal situation is that each expenditure is put in place in time according to the plan, and the put-in-place and the in-place timeliness rate is 100 percent.

4.1.2.2 maintenance line construction cost budget execution Rate

The index calculation method comprises the following steps: execution rate = (budget actual execution amount/budget plan execution amount) × 100%. The maintenance line construction unit should make an expense budget matched with the construction schedule according to the arrangement of construction expenses in the construction scheme, and the expense is used according to the budget. In practice, there are many situations affecting budget execution, of which the more important are the situation of cost availability and the situation of construction progress, and the construction cost execution rate of the maintenance line actually reflects the construction progress from the perspective of fund flow. The ideal situation is that the actual budget execution amount is basically consistent with the execution amount of the budget plan, and the budget execution rate is about 100%.

4.1.2.3 Conflict rate of land acquisition scale and maintenance line construction scheme

The index calculation method comprises the following steps: the coincidence rate = (actual land acquisition per mu/planned maintenance line construction plan per mu) × 100%. The land acquisition is a precondition for developing infrastructure construction, and the specific planned acreage of the land acquisition is determined according to a construction target and infrastructure construction scale in a construction scheme. In practice, the actual acreage may deviate from the planned acreage for government planning reasons, etc. The ideal situation is that the actual land collection acreage is basically consistent with the planned acreage of the construction scheme, and the coincidence rate is 100 percent.

4.1.2.4 coincidence rate of land evidence-taking time and maintenance line construction scheme

The index calculation method comprises the following steps: the compliance rate = (actual number of months for evidence collection/number of months for planned construction plan of maintenance line) × 100%. The electrification, the water supply, the ventilation, the network connection and the infrastructure construction of the plots can be carried out only after the national land use certificate is obtained, and the time for obtaining the national land use certificate should be determined in the construction scheme. Because the process of giving way and obtaining evidence of the state land relates to a plurality of government departments such as state, planning, environment and the like, the required administrative examination and approval are lacked, and the actual evidence obtaining time may deviate from the planning time. The ideal situation is that the actual evidence collection month number is basically consistent with the construction plan month number, and the coincidence rate is about 100%.

4.1.2.5 completion timeliness of infrastructure new construction or reconstruction

The index calculation method comprises the following steps: the timeliness rate = (number of actual completed months of infrastructure new construction or reconstruction/number of planned months of service line construction plan) × 100%. The planned time to complete the infrastructure new or rebuild should be determined in the construction plan. In practice, the actual completion time may deviate from the planned time due to government approval, investment of funds, design change, and the like. The ideal situation is that the actual number of finished months is basically consistent with the number of planned months of the construction scheme, and the coincidence rate is about 100%.

4.1.2.6 Foundation facility and maintenance technical data compliance rate

The index calculation method comprises the following steps: the compliance rate = (number of required maintenance technical data-number of nonconforming inspection by superior department of charge)/number of required maintenance technical data × 100%.

4.1.2.7 standard requirement conformity rate of infrastructure and airworthiness regulation

The index calculation method comprises the following steps: the conformity rate = (the number of standard requirements such as airworthiness regulations-the number of nonconforming requirements of the upper level department of charge) the number of standard requirements such as airworthiness regulations x 100%.

The new construction or reconstruction of the infrastructure by the maintenance line construction unit complies with the relevant regulations of the national standard, and complies with the standards of maintenance technical data, airworthiness regulations and the like. In the specifications of repair and maintenance technology, airworthiness regulations, etc., requirements are placed on infrastructure, including lighting, temperature, humidity, noise, atmospheric emissions, water emissions, etc. When the first (batch) engine maintenance preparation condition is examined, the superior competent department can examine the conforming condition of the infrastructure according to the specific requirements of the standards such as maintenance technical data, airworthiness regulations and the like, the ideal condition is that the number of nonconforming pieces is few or none, and the conforming rate of the infrastructure and the maintenance technical data, the conforming rate of the infrastructure and the airworthiness regulations and other standard requirements are about 100%.

4.1.2.8 in-place timeliness of tool and equipment

The index calculation method comprises the following steps: and the timeliness rate = (the number of actual in-place months of tool tools and equipment/the number of planned months of a maintenance line construction scheme) × 100%. The planned time for tool tooling and equipment deployment should be determined in the construction plan. In practice, the actual in-place time may deviate from the projected time due to financial investment, import tool and equipment transport and clearance, homemade or commissioned tooling and equipment review, and the like. The ideal situation is that the number of actual in-place months is basically consistent with the number of construction plan months, and the coincidence rate is about 100%.

4.1.2.9 tool tooling and equipment and maintenance technical data requirement conformity rate

4.1.2.10 tool equipment and airworthiness regulation and other standard requirement conformity rate

The index calculation method comprises the following steps: the conformity rate = (number of standard requirements such as airworthiness regulation-number of nonconforming by inspection of upper-level administrative department) x 100%.

The technical performance and reliability of the tool and the equipment are important bases for smoothly implementing maintenance operation and ensuring quality. The specifications such as maintenance technical data and airworthiness regulations and the like can provide requirements for the technical performance and reliability of tool tools and equipment, and the requirements comprise technical indexes, use environments, measurement, maintenance and the like. When a maintenance line construction unit carries out tool tooling and equipment configuration, the technical performance and reliability of the maintenance line construction unit must be ensured to meet the requirements of standards such as maintenance technical data, airworthiness regulations and the like. When a superior department of charge examines the preparation condition of first (batch) engine maintenance, the technical performance and reliability of tool and equipment can be examined according to the specific regulations of standards such as maintenance technical data, airworthiness regulations and the like. The ideal condition is that the number of the non-compliant tool is little or none, the compliance rate of the tool, the equipment and the maintenance technical data and the compliance rate of the tool, the equipment and the airworthiness regulation and other standard requirements are all about 100 percent.

4.1.2.11 in-place and in-time rates of equipment

The index calculation method comprises the following steps: and the timeliness rate = (the number of actual in-place months of equipment/the number of planned months of the construction scheme of the maintenance line) × 100%. The planned time for equipment deployment should be determined in the construction plan. In practice, the actual in-place time may deviate from the planned time due to investment, import equipment transportation and clearance, equipment substitute review, and the like. The ideal situation is that the number of actual in-place months is basically consistent with the number of construction plan months, and the coincidence rate is about 100%.

4.1.2.12 equipment and maintenance technical data requirement compliance rate

4.1.2.13 compliance rate of standard requirements of equipment and airworthiness regulations

The index calculation method comprises the following steps: the conformity rate = (the number of standard requirements such as airworthiness regulations and the like-the number of nonconforming items of inspection by the upper level department of charge) × 100%.

The equipment is an indispensable material basis for maintenance. The standards of maintenance technical data, airworthiness regulations and the like can provide requirements for equipment, including the aspects of brand, mark number, part number, source, storage and the like. When a maintenance line construction unit configures equipment, the equipment must meet the requirements of standards such as maintenance technical data, airworthiness regulations and the like. When the former department of charge examines the first (batch) engine maintenance preparation condition, the equipment is examined according to the specific regulations of the standards such as maintenance technical data, airworthiness regulations and the like. The ideal condition is that the number of the devices is not met, and the meeting rate of the equipment and the maintenance technical data requirement and the meeting rate of the standard requirements of the equipment and the airworthiness regulations are all about 100 percent.

4.1.2.14 people arrival rate

The calculation method of the index comprises the following steps: the person arrival rate = (actual number of persons in place/number of planned persons in the construction plan of the maintenance line) × 100%. According to the construction target, the construction scheme should specify the qualification requirements, post settings, number of persons to be allocated, time in place, training time, authorization time, etc. of various personnel for maintenance, clearance, management, support, etc. Before the first (batch) engine is serviced, the service line building entity should complete the configuration of the various personnel as planned. In practice, the actual number of people in place may deviate from the number of people in the plan of the construction plan due to the influence of factors such as compensation welfare, work place, qualification requirements and the like. The ideal situation is that the number of actual arriving people is basically the same as the number of planned people, namely the arrival rate of people is 100%.

4.1.2.15 qualification rate of personnel and technical data requirement conformity rate of maintenance

4.1.2.16 qualification of personnel and conformity rate of standard requirements such as airworthiness regulation

Personnel qualification is the basic guarantee of maintenance quality, and maintenance work and release must be performed by personnel with corresponding qualification. The standards such as maintenance technical data and airworthiness regulations can make requirements on the qualification of personnel related to the maintenance line, including training conditions, evidence obtaining conditions, working experience, authorization conditions and the like. When a maintenance line construction unit carries out personnel configuration, personnel resources must be ensured to meet the requirements of standards such as maintenance technical data, airworthiness regulations and the like. When the superior department of charge examines the preparation condition of the first (batch) engine maintenance, the personnel qualification is examined according to the specific regulations of the standards such as maintenance technical data, airworthiness regulations and the like. The ideal condition is that the number of the non-conforming pieces is little or none, and the compliance rate of the personnel qualification and the technical data requirement of the maintenance, and the compliance rate of the standard requirements such as the personnel qualification and the airworthiness regulation are all about 100 percent.

4.1.3 evaluation index of acceptance stage subprocess

4.1.3.1 first (batch) Engine repair preparation timeliness

The calculation method of the index comprises the following steps: and the time rate = (scheduled completion of inspection month/actual completion of inspection month) × 100%. Before the first engine maintenance is formally implemented, the maintenance line construction unit reports the preparation condition to the upper administrative department, receives the field examination of the upper administrative department, and can perform the first engine maintenance after the first engine maintenance is passed. After the maintenance line construction unit makes an application, the higher-level department of charge replies to the review work schedule, which includes time nodes for starting and finishing the review. It is desirable that the time to actually complete the review is less than or substantially equal to the time to schedule the review to be completed, i.e., at a time rate of around 100%.

4.1.3.2 first set (batch) Engine maintenance timeliness

The calculation method of the index comprises the following steps: and the timeliness rate = (planned maintenance days of the first engine (batch)/actual maintenance days of the first engine (batch)) multiplied by 100%. After the first (batch) engine field inspection of the maintenance line construction unit by the higher level department of administration, the maintenance planning period of the first (batch) engine should be determined, which is generally calculated in calendar days. In practice, the actual number of days of maintenance may deviate from the planned number of days of maintenance due to factors such as the skill level of a maintenance worker, the engine technical state and the failure condition, the parts outsourcing maintenance control, and the customer's special requirements. The ideal situation is that the actual maintenance days are less than or equal to the planned maintenance days, namely the timeliness rate is about 100%.

4.1.3.3 first-stage (batch) engine one-time test run qualification rate

The calculation method of the index comprises the following steps: the one-time test run qualification rate = (number of first engine test runs per total number of first engine test runs) × 100%. The first (batch) engine test is a main evaluation means for judging whether the technical performance and the maintenance quality of the repaired aero-engine meet the specified requirements of maintenance technical data, and the automatic test is the most main mark for completing the construction of a maintenance line. In practice, under the influence of factors such as the operation proficiency of maintenance personnel, the working quality and the like, the condition that the test run is unqualified once and needs to be carried out again after the fault is eliminated can occur. The ideal situation is that the first engine (batch) is completely qualified after one test run, namely the qualification rate of one test run is 100%.

4.1.3.4 average engine life

The index calculation method comprises the following steps: average age = total hours of first engine (batch)/total number of first engine (batch). After the first (batch) engine is delivered to a user, the service hours from installation to next release become the main index for judging the maintenance quality, and the higher the service hour value is, the better the maintenance quality is; if the service hours of the first engine (batch) after maintenance reach or even exceed the average service hours of the new engine from installation to distribution, the maintenance quality is obviously better. During the first (batch) engine installation and use process, due to bird strike, foreign object suction, extreme weather, human error in maintenance and the like, early delivery can be caused, so that the average use time of the first (batch) engine needs to be counted. It is desirable that the average service time of the first engine (batch) reaches or even exceeds the newly-developed average service time. The evaluation indexes of each sub-process and the corresponding ideal values are shown in table 18.

TABLE 18 evaluation indexes and ideal numerical tables for each subprocess

4.2 subprocess efficiency evaluation method

When the efficiency of a sub-process for building a certain maintenance line needs to be evaluated, the method comprises the following steps:

a) And for the sub-process needing to be evaluated, obtaining an evaluation index value according to the practical situation of the sub-process implementation and the sub-process evaluation index calculation method provided by 4.1.

b) The evaluation values were compared with the ideal values listed in table 18, and the degree of deviation was analyzed, with the lower the degree of deviation the better the construction performance.

c) If the construction efficiency of the same subprocess of a plurality of different maintenance lines needs to be compared, the evaluation index value of the same subprocess of each maintenance line to be evaluated is calculated according to a), and compared with the ideal value listed in the table 18, the deviation degree is analyzed, and the lower the deviation degree, the better the construction efficiency.

In practice, the MRO enterprise or its upper-level department of administration often requires evaluation of a sub-process of construction of a certain maintenance line or evaluation of the same sub-process of construction of several maintenance lines according to the work needs. In the embodiment, aiming at a process layer in an efficiency evaluation model, a plurality of quantitative evaluation indexes are respectively set for each sub-process construction efficiency in an index layer, and each index is set with an ideal value as an evaluation reference; and calculating an evaluation index value of the maintenance line construction subprocess to be evaluated, comparing the evaluation index value with an evaluation standard, and analyzing the deviation degree to complete the evaluation.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and are only illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The method for evaluating the construction efficiency of the maintenance line of the aero-engine is characterized by comprising the following steps:

step two: extracting corresponding importance values from the constituent elements of the maintenance line and the construction process by using an expert rating method and a five-level rating method;

step four: and according to the second step, calculating the ranking weight of the construction process and the constituent elements in the maintenance line of the construction efficiency to be evaluated, analyzing the deviation of the ranking weight and the evaluation standard, and finishing the quantitative evaluation of the construction efficiency.

2. The method for evaluating the construction efficiency of the maintenance line of the aircraft engine as recited in claim 1, wherein the first step specifically comprises: analyzing according to relevant clauses of airworthiness regulations and the maintenance line conditions of domestic M company and H group, and determining 7 types of components of the maintenance line: facilities, tools, equipment, personnel, maintenance data, and expenses; analyzing the construction process of 3 maintenance lines in the history of the H group, and determining that the construction process of the maintenance lines comprises three stages and 14 sub-processes; the three stages are as follows: a preparation stage, an implementation stage and an acceptance stage; the 14 subprocesses comprise establishing an organization leader mechanism, carrying out maintenance line construction feasibility demonstration, configuring maintenance technical data, making a maintenance line construction scheme, examining and approving by a higher-level department of charge, financing maintenance line construction expenses, expropriating land, designing and constructing infrastructure, configuring tool tools and equipment, configuring personnel, examining by the higher-level department of charge, maintaining a first engine and identifying and delivering the first engine.

3. The aircraft engine service line construction efficiency evaluation method according to claim 1, wherein the second step specifically comprises the following substeps:

S22, scoring the importance of each component by using a five-level scoring method, and scoring the importance of each component and corresponding relative weight w _j Multiplying to obtain the importance value of each component, which is shown as the following formula:

M _j ＝∑w _j M _ij

wherein M is _j The importance value of the jth element; w is a _j Is the relative weight of the jth element, and ∑ w _j ＝1，0＜w _j ＜1；M _ij The grade of the importance degree of the ith expert to the jth element is judged;

N _i ＝∑(T _i t year M _i /M)/2

Wherein N is _i Is the importance score, T, of the ith sub-process _i For the implementation time of the ith sub-process, T is the total time for the maintenance line construction to be implemented, M _i The expenses invested for the ith sub-process and M is the total expenses invested for the construction of the maintenance line;

S _i ＝100N _i k _j

wherein S is _i The importance of the ith sub-process; n is a radical of _i The importance score of the ith sub-process; k is a radical of _j Is the relative weight of the jth sub-process, and ∑ k _j ＝1(0＜k _j ＜1)。

4. The method for evaluating the construction efficiency of the maintenance line of the aero-engine according to claim 1, wherein the third step specifically comprises:

and S32, calculating the ranking weight of each component element and the construction process which are scheduled to realize the construction target of the maintenance line in the maintenance line construction efficiency evaluation model by utilizing yaahp12 software, taking the calculated ranking weight as an evaluation reference, and adjusting the unreasonable content of the model.

5. The aircraft engine maintenance line construction efficiency evaluation method according to claim 4, wherein the maintenance line construction efficiency evaluation model comprises a target layer, an element layer, a process layer and an index layer; the target layer is a maintenance line construction target which is preset to be realized; the element layer comprises 7 components of maintenance data, expenses, equipment, personnel, equipment, facilities and tools; the process layer is 14 subprocesses including establishing an organization leader mechanism, conducting maintenance line construction feasibility demonstration, configuring maintenance technical data, making a maintenance line construction scheme, examining and approving a higher-level department of charge, financing maintenance line construction expenses, expropriating land, designing and constructing infrastructure, configuring tool tools and equipment, configuring personnel, examining by the higher-level department of charge, maintaining a first engine, identifying and delivering the first engine; the index layers are 28 evaluation indexes provided for each sub-process.

6. The aircraft engine service line construction efficiency evaluation method according to claim 4, wherein the substep S32 specifically comprises the following steps:

s3201, establishing a hierarchical structure model, establishing a maintenance line construction efficiency evaluation hierarchical structure model in yaahp12 software according to a maintenance line construction efficiency evaluation model, and judging and adjusting the rationality of the model until no unreasonable content is displayed in the model;

s3203, automatically generating a target layer-element layer judgment matrix and simultaneously automatically generating an element layer-process layer judgment matrix, respectively inputting the importance values of the subprocesses, judging the integrity and consistency of the element layer-process layer judgment matrix one by one, and screening out unreasonable importance values;

7. The aircraft engine service line construction efficiency evaluation method according to claim 1, wherein the fourth step specifically comprises the following steps:

d) Establishing a target layer-element layer judgment matrix and an element layer-process layer judgment matrix by using yaahp12 software, respectively judging the integrity and consistency of the matrixes, and adjusting the matrixes to be reasonable according to software prompts;

g) If the construction efficiency of a plurality of maintenance lines needs to be compared, calculating all sequencing weight values of each to-be-evaluated aircraft engine maintenance line according to the steps a) -e), and comparing the sequencing weight values with the sequencing weight values in the evaluation reference, wherein the construction efficiency is better when the deviation degree is lower.