Method for analyzing and evaluating replacement time of outfield replaceable unit of aero-engine

Abstract

The invention belongs to the field of aero-engine maintenance, and particularly relates to an aero-engine outfield replaceable unit replacement time analysis and evaluation method. The method comprises the following steps: 1, determining key factors influencing the replacement time of an external field replaceable unit, and constructing an external field replaceable unit replacement time analysis and evaluation model according to the key factors; 2, obtaining the value of each key factor, substituting the value of each key factor into the external field replaceable unit replacement time analysis and evaluation model, and calculating the installation state replacement time evaluation value of the external field replaceable unit; and step 3, acquiring an actual value of the replacement time of the installation state of the external field replaceable unit, and verifying the assessment value of the replacement time of the installation state of the external field replaceable unit according to the actual value of the replacement time of the installation state of the external field replaceable unit. According to the method and the device, the problem that the replacement time of the outfield replaceable unit is difficult to evaluate under the condition that an engine does not obtain a data sample of the installed and replaced outfield replaceable unit is solved.

Description

Technical Field

[0001] This application belongs to the field of aero-engine maintenance, and particularly relates to a method for analyzing and evaluating the replacement time of line replaceable units (LRUs) of aero-engines in the field. Background Art

[0002] The replacement time of line replaceable units (LRUs) is one of the maintainability indicators that users are particularly concerned about. Usually, users will put forward requirements for the replacement time of LRUs in the overall development requirements. In addition to the design factors of the engine itself, the opening of aircraft access panels is also an important factor affecting the replacement time of LRUs. In the evaluation of this indicator, the data for hair loss evaluation is relatively easy to evaluate, while the installation replacement time is difficult to evaluate. On the one hand, the method of installation verification has a greater impact on the flight and engine tasks. On the other hand, it is very difficult to collect a sufficient sample size for ad hoc verification.

[0003] Existing analysis and evaluation methods for the replacement time of aero-engine LRUs without installation verification data mainly use virtual maintenance methods to establish flight and engine models, and use wearable devices to simulate the actual working environment for analysis and evaluation. The main disadvantages of this method are: first, it has high requirements for model accuracy, and often the engine cannot obtain a complete aircraft model; second, it has high requirements for equipment and software, and requires special high-precision wearable devices and virtual maintenance software.

[0004] Therefore, it is desirable to have a technical solution to overcome or at least mitigate at least one of the above-mentioned defects of the existing technology. Summary of the Invention

[0005] The purpose of this application is to provide a method for analyzing and evaluating the replacement time of line replaceable units of aero-engines in the field to solve at least one problem existing in the existing technology.

[0006] The technical solution of this application is as follows: A method for analyzing and evaluating the replacement time of line replaceable units of aero-engines includes: Step 1: Determine the key factors affecting the replacement time of line replaceable units, and construct an analysis and evaluation model for the replacement time of line replaceable units according to the key factors; Step 2: Obtain the values of each key factor, and substitute the values of each key factor into the analysis and evaluation model for the replacement time of line replaceable units to calculate the evaluation value of the replacement time of line replaceable units in the installed state; Step 3: Obtain the actual value of the replacement time of line replaceable units in the installed state, and verify the evaluation value of the replacement time of line replaceable units in the installed state according to the actual value of the replacement time of line replaceable units in the installed state.

[0007] In at least one embodiment of the present application, in step one, determine the key factors affecting the replacement time of the field replaceable unit, and construct an analysis and evaluation model for the replacement time of the field replaceable unit according to the key factors, including: Determine the key factors affecting the replacement time of the field replaceable unit, where the key factors include: the replacement time of the hair loss state of the field replaceable unit, the comprehensive installation influence difficulty coefficient, and the standard person coefficient; Construct an analysis and evaluation model for the replacement time of the field replaceable unit according to the key factors, and the analysis and evaluation model for the replacement time of the field replaceable unit is: ; Wherein, T cti is the evaluation value of the replacement time of the installation state of the i-th field replaceable unit, T i is the replacement time of the hair loss state of the i-th field replaceable unit, S is the comprehensive installation influence difficulty coefficient, M is the standard person coefficient.

[0008] In at least one embodiment of the present application, the comprehensive installation influence difficulty coefficient S is: ; Wherein, a 1 、a 2 ,... a j are the difficulty coefficients of different influencing factors respectively.

[0009] In at least one embodiment of the present application, the difficulty coefficients of the influencing factors include: the difficulty coefficient of the access panel position, the difficulty coefficient of wiring, and the difficulty coefficient of force limitation.

[0010] In at least one embodiment of the present application, in step two, obtain the value of the comprehensive installation influence difficulty coefficient, including: According to the relationship between the field replaceable unit and the access panel position, select a value between 1 and 10 as the value of the difficulty coefficient of the access panel position; Judge whether wiring is required. If so, the value of the wiring difficulty coefficient is 2. If not, the value of the wiring difficulty coefficient is 1; Judge whether force limitation is required. If so, the value of the force limitation difficulty coefficient is 2. If not, the value of the force limitation difficulty coefficient is 1; Perform a product operation on the values of the difficulty coefficient of the access panel position, the wiring difficulty coefficient, and the force limitation difficulty coefficient to calculate the value of the comprehensive installation influence difficulty coefficient.

[0011] In at least one embodiment of the present application, in step two, obtaining the value of the standard person coefficient includes: Defining the proficiency level and technical grade of the standard person; Determining the proficiency level and technical grade of the operator; Scoring the proficiency level of the operator according to the proficiency level of the standard person to obtain the first standard person coefficient; Scoring the technical grade of the operator according to the technical grade of the standard person to obtain the second standard person coefficient; Adding the first standard person coefficient and the second standard person coefficient to obtain the value of the standard person coefficient.

[0012] In at least one embodiment of the present application, in step three, obtaining the actual value of the replacement time of the line-replaceable unit (LRU) installation status and verifying the evaluation value of the replacement time of the LRU installation status according to the actual value of the replacement time of the LRU installation status includes: Obtaining the actual value of the replacement time of the LRU installation status; Calculating the error between the evaluation value of the replacement time of the LRU installation status and the corresponding actual value of the replacement time of the LRU installation status; Judging whether the error between the evaluation value of the replacement time of the LRU installation status and the corresponding actual value of the replacement time of the LRU installation status meets the requirements. If so, the evaluation value of the replacement time of the LRU installation status is valid; otherwise, return to step two to re-obtain the values of each of the key factors.

[0013] In at least one embodiment of the present application, the error between the evaluation value of the replacement time of the LRU installation status and the corresponding actual value of the replacement time of the LRU installation status is: ; Wherein, is the error between the i-th evaluation value of the replacement time of the LRU installation status and the i-th actual value of the replacement time of the LRU installation status, is the i-th actual value of the replacement time of the LRU installation status.

[0014] The invention has at least the following beneficial technical effects: The method for analyzing and evaluating the replacement time of the line-replaceable unit of the aeroengine of the present application adopts the analysis and evaluation model of the replacement time of the line-replaceable unit, and takes the result of the hair loss verification as the benchmark to identify the key factors affecting the replacement time of the line-replaceable unit after installation, and completes the analysis and evaluation of the replacement time of the line-replaceable unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a flowchart of the analysis and evaluation method for the replacement time of the line-replaceable unit of an aero-engine in an embodiment of the present application. Specific embodiments

[0016] To make the purpose, technical solutions, and advantages of the implementation of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0017] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present application.

[0018] The following will further elaborate on the present application in conjunction with the attached Figure 1 Make a further detailed description of the present application.

[0019] The present application provides an analysis and evaluation method for the replacement time of the line-replaceable unit of an aero-engine, including the following steps: Step 1: Determine the key factors affecting the replacement time of the line-replaceable unit, and construct an analysis and evaluation model for the replacement time of the line-replaceable unit based on the key factors; Step 2: Obtain the values of each key factor, and substitute the values of each key factor into the analysis and evaluation model for the replacement time of the line-replaceable unit to calculate the evaluation value of the replacement time of the line-replaceable unit in the installed state; Step 3: Obtain the actual value of the replacement time of the line-replaceable unit in the installed state, and verify the evaluation value of the replacement time of the line-replaceable unit in the installed state based on the actual value of the replacement time of the line-replaceable unit in the installed state.

[0020] Specifically, such as Figure 1As shown, in Step 1, first, determine the key factors affecting the replacement time of the field-replaceable unit. In the preferred embodiment of the present application, there are three key factors affecting the replacement time of the field-replaceable unit. One is the replacement time of the field-replaceable unit in the hair loss state, and this key factor is the inherent maintainability design of the engine; another is the comprehensive installation influence difficulty coefficient, and this key factor is the factor after the engine is installed; the third is the standard person coefficient, and this key factor reflects the influence caused by different operators on the result.

[0021] In this embodiment, according to the above three key factors, an analysis and evaluation model for the replacement time of the field-replaceable unit is constructed. The analysis and evaluation model for the replacement time of the field-replaceable unit is: ; Among them, T cti is the evaluation value of the replacement time of the i-th field-replaceable unit in the installed state, T i is the replacement time of the i-th field-replaceable unit in the hair loss state, S is the comprehensive installation influence difficulty coefficient, M is the standard person coefficient.

[0022] This analysis and evaluation model for the replacement time of the field-replaceable unit takes the replacement time T i of each field-replaceable unit in the hair loss state as the reference value, determines the comprehensive installation influence difficulty coefficient and the standard person coefficient according to the installation influence degree, and performs a product operation on the reference value, the comprehensive installation influence difficulty coefficient and the standard person coefficient to obtain the evaluation value of the replacement time of the field-replaceable unit in the installed state.

[0023] In this embodiment, the comprehensive installation influence difficulty coefficient S is: ; Among them, a 1 、a 2 ,... a j are the difficulty coefficients of different influencing factors respectively.

[0024] Generally, the main influencing factors restricting the replacement of parts after the aero-engine is installed are the access cover position, safety wiring, and force limit. Therefore, the difficulty coefficients of the influencing factors include: the difficulty coefficient of the access cover position, the difficulty coefficient of safety wiring, and the difficulty coefficient of force limit.

[0025] In the preferred embodiment of the present application, in Step 2, obtaining the value of the comprehensive installation influence difficulty coefficient includes: Select a value between 1 and 10 as the value of the access panel position difficulty coefficient according to the relationship between the field replaceable unit and the access panel position. See Table 1; Determine whether to install a safety device. If so, the value of the safety device installation difficulty coefficient is 2. If not, the value of the safety device installation difficulty coefficient is 1. See Table 2; Determine whether there is a force limit. If so, the value of the force limit difficulty coefficient is 2. If not, the value of the force limit difficulty coefficient is 1. See Table 3; Perform a product operation on the values of the access panel position difficulty coefficient, the safety device installation difficulty coefficient, and the force limit difficulty coefficient to calculate the value of the comprehensive installation influence difficulty coefficient.

[0026] Table 1

[0027] Table 2

[0028] Table 3

[0029] In the preferred embodiment of the present application, in step two, obtaining the value of the standard person coefficient includes: Define the proficiency and technical level of the standard person; Determine the proficiency and technical level of the operator; Score the operator's proficiency according to the proficiency of the standard person to obtain the first standard person coefficient; Score the operator's technical level according to the technical level of the standard person to obtain the second standard person coefficient; Add the first standard person coefficient and the second standard person coefficient to obtain the value of the standard person coefficient.

[0030] By constructing a technical worker evaluation system, convert the influence of the operator into an external field standard person according to the proficiency and technical level of the operator, avoiding the influence caused by different operators on the results.

[0031] In the preferred embodiment of the present application, the values of the difficulty coefficients of each influencing factor and the standard person coefficient are respectively determined by 3 workers with experience in installing and replacing parts and 1 external structural designer, and the average value is calculated. Then, calculate the comprehensive installation influence difficulty coefficient according to the determined difficulty coefficients of each influencing factor. Table 4 shows the comprehensive installation influence difficulty coefficient and the standard person coefficient obtained by taking a certain fuel pump as an example.

[0032] Table 4

[0033] Obtain the value of the replacement time of the outfield replaceable unit's hair loss state. After determining the comprehensive installation impact difficulty coefficient and the standard person coefficient through the above method, calculate the evaluation value of the installation state replacement time of the outfield replaceable unit according to the outfield replaceable unit replacement time analysis and evaluation model. Table 5 shows the evaluation value of the installation state replacement time of the outfield replaceable unit obtained taking a certain fuel pump as an example.

[0034] Table 5

[0035] For the analysis and evaluation method of the replacement time of the outfield replaceable unit of the aero-engine in this application, after obtaining the evaluation value of the installation state replacement time of the outfield replaceable unit, it is necessary to verify the accuracy of the evaluation result. In step three, the verification process specifically includes: Obtain the actual value of the installation state replacement time of the outfield replaceable unit; Calculate the error between the evaluation value of the installation state replacement time of the outfield replaceable unit and the corresponding actual value of the installation state replacement time of the outfield replaceable unit; Judge whether the error between the evaluation value of the installation state replacement time of the outfield replaceable unit and the corresponding actual value of the installation state replacement time of the outfield replaceable unit meets the requirements. If so, the evaluation value of the installation state replacement time of the outfield replaceable unit is valid; otherwise, return to step two to re-obtain the values of each key factor.

[0036] Among them, the error between the evaluation value of the installation state replacement time of the outfield replaceable unit and the corresponding actual value of the installation state replacement time of the outfield replaceable unit is: ; Among them, is the error between the evaluation value of the installation state replacement time of the i-th outfield replaceable unit and the actual value of the installation state replacement time of the i-th outfield replaceable unit, is the actual value of the installation state replacement time of the i-th outfield replaceable unit.

[0037] Taking the outfield replaceable units actually replaced in the installed state as the object, calculate the error according to the evaluation value and the actual value. If the error is less than or equal to 0.1, the evaluation value is valid. If the error is greater than 0.1, corresponding adjustments need to be made to the values of each key factor. The verification process can select more than 2 samples among the outfield replaceable units for verification according to the actual obtained real replacement time sample situation. Table 6 shows the verification results obtained taking a certain fuel pump as an example.

[0038] Table 6

[0039] The method for analyzing and evaluating the replacement time of the line-replaceable unit of the aero-engine in this application solves the problem of the difficulty in evaluating the replacement time of the line-replaceable unit under the condition that the engine does not obtain the data samples for replacing the line-replaceable unit during installation, and improves the ability of the aero-engine line-replaceable unit design analysis and maintainability quantitative index analysis and evaluation.

[0040] For the method for analyzing and evaluating the replacement time of the line-replaceable unit of the aero-engine in this application, all the required conditions and data are obtained by the engine design unit without being restricted by other conditions; a mathematical model is adopted without relying on software tools, reducing the analysis and evaluation cost; the efficiency of maintainability analysis and evaluation is improved, and multiple evaluations can be realized during the whole life cycle work to iteratively improve the design.

[0041] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in this application should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A method for analyzing and evaluating the replacement time of an aircraft engine field replaceable unit, characterized in that: include: Step 1: determine the key factors that affect the replacement time of the line replaceable unit, and construct a line replaceable unit replacement time analysis and evaluation model based on the key factors; Step 2: Obtain the value of each of the key factors, and substitute the value of each of the key factors into the field replaceable unit replacement time analysis and evaluation model to calculate the field replaceable unit installation status replacement time evaluation value; Step three: obtaining an actual value of the installation status replacement time of the line replaceable unit, and verifying the evaluation value of the installation status replacement time of the line replaceable unit according to the actual value of the installation status replacement time of the line replaceable unit.

2. The method for analyzing and evaluating the replacement time of an aircraft engine field replaceable unit according to claim 1, characterized in that: In step 1, key factors affecting the replacement time of the line replaceable unit are determined, and a line replaceable unit replacement time analysis and evaluation model is constructed based on the key factors, including: Determine the key factors that affect the replacement time of the field replaceable unit, the key factors include: the replacement time of the field replaceable unit due to hair loss status, the comprehensive difficulty coefficient of installation, and the standard person coefficient; A line replaceable unit replacement time analysis and evaluation model is constructed based on the key factors, and the line replaceable unit replacement time analysis and evaluation model is: ； in, T cti is the replacement time evaluation value of the installed state of the i-th field replaceable unit, T i is the hair loss state replacement time of the i-th field replaceable unit, S The comprehensive difficulty coefficient of installation, M is the standard human coefficient.

3. The method for analyzing and evaluating the replacement time of an aircraft engine field replaceable unit according to claim 2, characterized in that: The comprehensive impact of the installation difficulty coefficient S for: ； in, a 1 、a 2.... a j They are the difficulty coefficients of different influencing factors respectively.

4. The method for analyzing and evaluating the replacement time of an aircraft engine field replaceable unit according to claim 3, characterized in that: The difficulty coefficients of the influencing factors include: difficulty coefficient of the mouth cover position, difficulty coefficient of the safety device, and difficulty coefficient of the force limit.

5. The method for analyzing and evaluating the replacement time of an aircraft engine field replaceable unit according to claim 4, characterized in that: In step 2, obtaining the value of the comprehensive difficulty coefficient of the installation includes: According to the relationship between the field replaceable unit and the position of the cover, a value between 1 and 10 is selected as the value of the difficulty coefficient of the cover position; Determine whether to apply for insurance, if yes, the difficulty coefficient of applying for insurance is 2, if no, the difficulty coefficient of applying for insurance is 1; Determine whether force is limited, if so, the value of the force limit difficulty coefficient is 2, if not, the value of the force limit difficulty coefficient is 1; The value of the comprehensive installation difficulty coefficient is calculated by multiplying the values ​​of the cover position difficulty coefficient, the safety difficulty coefficient and the force limit difficulty coefficient.

6. The method for analyzing and evaluating the replacement time of an aircraft engine field replaceable unit according to claim 5, characterized in that: In step 2, obtaining the value of the standard human coefficient includes: Define standard human proficiency and skill levels; Determine the proficiency and skill level of operators; Score the proficiency of the operator according to the proficiency of the standard person to obtain the first standard person coefficient; Score the operator's technical level according to the standard person's technical level to obtain the second standard person coefficient; The first standard person coefficient and the second standard person coefficient are added to obtain a value of the standard person coefficient.

7. The method for analyzing and evaluating the replacement time of an aircraft engine field replaceable unit according to claim 6, characterized in that: In step three, the actual value of the installation status replacement time of the line replaceable unit is obtained, and the evaluation value of the installation status replacement time of the line replaceable unit is verified according to the actual value of the installation status replacement time of the line replaceable unit, including: Get the actual value of the replacement time of the field replaceable unit installation status; Calculating the error between the estimated value of the installation status replacement time of the line replaceable unit and the corresponding actual value of the installation status replacement time of the line replaceable unit; Determine whether the error between the evaluation value of the external replaceable unit installation status replacement time and the corresponding actual value of the external replaceable unit installation status replacement time meets the requirements; if so, the evaluation value of the external replaceable unit installation status replacement time is valid; otherwise, return to step 2 to re-obtain the values ​​of each of the key factors.

8. The method for analyzing and evaluating the replacement time of an aircraft engine field replaceable unit according to claim 7, characterized in that: The error between the estimated value of the replacement time of the installed state of the line replaceable unit and the corresponding actual value of the replacement time of the installed state of the line replaceable unit is: ； in, is the error between the estimated replacement time of the i-th field replaceable unit installation status and the actual replacement time of the i-th field replaceable unit installation status, is the actual value of replacement time of the installed status of the i-th field replaceable unit.

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