Configuration Method of Pulse Assembly Production Line for Aeroengine Final Assembly

Abstract

The present application relates to a configuration method for a pulsating assembly production line for aero-engine final assembly. The method includes: determining the final assembly process sequence according to the sequence and material requirements of the sub-processes of the aero-engine final assembly process; estimating the preparation time and working time of each assembly operation of each sub-process in the final assembly process based on historical man-hour statistics and standard man-hour calculation methods, so as to estimate the total assembly time required for performing the final assembly of a single engine; calculating the number of workstations based on the total assembly time and the pulsating beat, where the pulsating beat is the interval time between two consecutive pulsations of the pulsating assembly production line; allocating assembly operations to each workstation based on the number of workstations and the total assembly time; and adjusting the configuration of the pulsating assembly production line based on the balance rate of the pulsating assembly production line.

Description

Technical Field

[0001] This application relates to the general assembly of aero-engines, and particularly to the configuration technology of a pulsating assembly line for the general assembly of aero-engines. Background Art

[0002] A pulsating assembly line is an assembly line that moves according to a pulsating rhythm, and is a form of assembly line between a fixed-station assembly line and a continuous moving assembly line. The typical feature of a pulsating assembly line is that the assembly operation pauses when the production line moves, and the assembly operation is carried out when the production line stops. A pulsating assembly line is a production line commonly used in the general assembly of aero-engines.

[0003] Based on the above characteristics of the pulsating assembly line, how to configure the pulsating assembly line, such as how to allocate the assembly operations to each workstation, determines the production efficiency and resource utilization rate of this production line. Different from manufacturing and assembly production lines such as automobiles and ships, the total order quantity of aero-engines is limited, and the production efficiency of the production line for the general assembly of aero-engines is not the higher the better, because the resource waste caused by the idle production line is more significant. Therefore, there is an urgent need for a production line configuration method that can improve the resource utilization rate while coordinating the production efficiency. This application is proposed for this purpose. Summary of the Invention

[0004] This application relates to a configuration method for a pulsating assembly line for the general assembly of aero-engines. According to the configuration method of this application, while taking into account the production efficiency, the resource utilization rate can be improved, and the high balance rate of the pulsating assembly line can be maintained.

[0005] According to one aspect of this application, there is provided a configuration method for a pulsating assembly line for the general assembly of aero-engines, including: determining the general assembly process sequence according to the sequence and material requirements of the sub-processes of the aero-engine general assembly process; estimating the preparation time and working time of each assembly operation of each sub-process in the general assembly process based on historical man-hour statistics and standard man-hour calculation methods, so as to estimate the total assembly time required for assembling a single engine; calculating the number of workstations based on the total assembly time and the pulsating rhythm, where the pulsating rhythm is the interval time between two consecutive pulsations of the pulsating assembly line; allocating assembly operations to each workstation based on the number of workstations and the total assembly time; and adjusting the configuration of the pulsating assembly line based on the balance rate of the pulsating assembly line.

[0006] In some examples of this method, allocating assembly operations to each workstation based on the number of workstations and the total assembly time includes: allocating assembly operations to each workstation in a manner of evenly distributing the assembly time according to the total assembly time and the number of workstations.

[0007] In some examples of the method, the method further includes: calculating the production cycle of each station and determining the maximum production cycle, where the production cycle is the time required for each station to complete the assigned assembly operation; and calculating the balance rate of the pulsating assembly production line based on the maximum production cycle.

[0008] In some examples of the method, the method further includes: when the balance rate is lower than the first threshold but higher than the second threshold, increasing or decreasing the assembly operations assigned to each station, or adjusting the general assembly process sequence until the balance rate of the adjusted pulsating assembly production line reaches the first threshold; and when the balance rate is lower than the second threshold, incrementing the number of stations by a difference value, and allocating assembly operations to each station based on the incremented number of stations and the total assembly time combined with the number of sub-processes until the balance rate of the adjusted pulsating assembly production line reaches the second threshold.

[0009] The production line configuration method of the present application determines the initial number of stations with the expected output as a consideration factor, calculates the balance rate of the production line based on the maximum production cycle and the number of stations, and adjusts the allocation of assembly operations to each station and the number of stations by comparing the balance rate with the threshold, so as to improve the resource utilization rate of the production line while coordinating production efficiency.

[0010] Description of the Drawings

[0011] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present application will become more apparent:

[0012] Figure 1 is a flowchart of a method for configuring a pulsating assembly production line for the general assembly of an aeroengine according to an aspect of the present application;

[0013] Figure 2 is a schematic diagram of the general assembly process sequence according to an aspect of the present application;

[0014] Figure 3 is a schematic diagram for estimating the waiting time and working time of each assembly operation according to an aspect of the present application;

[0015] Figure 4 is a schematic diagram of the layout of a pulsating assembly production line according to an aspect of the present application. Detailed Description of the Embodiment

[0016] To make the objectives, technical solutions, and advantages of this application more clear and understandable, the following further elaborates on this application in detail with reference to specific embodiments and the accompanying drawings. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the described exemplary embodiments. However, it will be apparent to those skilled in the art that some or all of these specific details may not be necessary to practice the described embodiments. In other exemplary embodiments, well-known structures are not described in detail to avoid unnecessarily obscuring the concepts of this disclosure. It should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application. At the same time, aspects described in the embodiments can be arbitrarily combined without conflict.

[0017] It should be noted that in this application, a pulsating assembly line is an assembly line that moves according to a pulsating rhythm, and it is a form of assembly line between a fixed-station assembly line and a continuously moving assembly line. When the pulsating assembly line moves, the assembly operation pauses, and when the production line is stationary, the assembly operation is carried out. The pulsating rhythm is the interval time between two consecutive pulsations of the pulsating assembly line. A work station, also known as a work area, refers to an area where a series of assembly work is completed by a rated number of workers.

[0018] It should be understood that any term or vocabulary used in this application, unless otherwise specified, represents its usual meaning in the relevant field, specifically in the field of the pulsating assembly line of aero-engines.

[0019] To better understand this application, the following explains various aspects of this application with reference to the accompanying drawings and specific embodiments.

[0020] Refer to Figure 1 , which shows a configuration method 100 for a pulsating assembly line for the final assembly of an aero-engine. The method 100 includes: in step 101, determining the final assembly process sequence according to the sequence of sub-processes and material requirements of the aero-engine final assembly process; in step 102, estimating the preparation time and working time of each assembly operation of each sub-process in the final assembly process based on historical man-hour statistics and standard man-hour calculation methods, so as to estimate the total assembly time required to perform the final assembly of a single engine; in step 103, calculating the number of work stations based on the total assembly time and the pulsating rhythm, where the pulsating rhythm is the interval time between two consecutive pulsations of the pulsating assembly line; in step 104, allocating assembly operations to each work station based on the number of work stations and the total assembly time; and in step 105, adjusting the configuration of the pulsating assembly line based on the balance rate of the pulsating assembly line.

[0021] Specifically, step 101 includes determining the general assembly process sequence according to the sequence of sub-processes of the aero-engine general assembly process and the material requirements. In one example, the content and quantity of the sub-processes of the aero-engine general assembly process vary depending on the type of the aero-engine. In one example, the sub-processes of the aero-engine general assembly process include fan unit assembly, core engine main unit assembly, turbine unit assembly, accessory assembly, pre-test inspection, etc. In one example, determine the assembly operations included in each sub-process. In one example, the fan unit assembly sub-process may include assembly operations such as hoisting the fan unit, installing the fan blades, and installing the fan inlet cone. In one example, the core engine main unit assembly may include assembly operations such as hoisting the core engine main unit, heating the IGB, docking the core engine main unit, installing the bracket pipeline, and installing the fulcrum nut. In one example, the turbine unit assembly sub-process may include assembly operations such as hoisting the turbine unit, docking the turbine unit, installing the shaft end nut, installing the bracket, sealing the fulcrum, and installing the turbine air cooling pipe. In one example, the accessory assembly sub-process may include assembly operations such as bracket assembly, pipeline assembly, cable assembly, and exhaust system installation. In one example, the pre-test inspection sub-process may include assembly operations such as visual inspection, borescope inspection, and reverse rotation. In one example, determining the assembly operations included in each sub-process may include determining the operations required for each assembly operation. In one example, determining the operations required for each assembly operation may include determining how many screws need to be tightened and how many parts need to be moved for hoisting the fan unit, such as 100 screws and moving 10 parts.

[0022] Generally, each sub-process is executed in the process sequence. In one example, the aero-engine general assembly is executed in the sequence of fan unit assembly, core engine main unit assembly, turbine unit assembly, accessory assembly, and pre-test inspection. In some examples, each sub-process includes multiple assembly operations with adjustable sequences. In some examples, the assembly operations with adjustable sequences include the assembly operations with adjustable sequences within the sub-process and the assembly operations with adjustable sequences across sub-processes. For example, the assembly operations such as installing the fan blades and installing the fan inlet cone included in the fan unit assembly sub-process can be executed after the core engine main unit assembly sub-process across sub-processes. In another example, the sequence of the assembly operations such as bracket assembly, pipeline assembly, cable assembly, and exhaust system installation included in the accessory assembly sub-process can be changed.

[0023] In some examples, determine the material requirements of the sub-processes of the aero-engine general assembly process. In one example, the material requirements include the finished or semi-finished parts, components and their quantities required for each sub-process. In one example, determining the material requirements of the sub-processes of the aero-engine general assembly process includes determining the material requirements of the assembly operations of each sub-process.

[0024] Those skilled in the art should understand that the content, quantity, and sequence of the sub - processes of the above - mentioned aero - engine final assembly process are merely an example. The content, quantity, and sequence of any other applicable sub - processes are also covered when applicable to the solution of this application.

[0025] In some examples, step 101 includes determining the final assembly process sequence according to the determined sub - process sequence and material requirements. In some examples, determining the final assembly process sequence may include sequencing each assembly operation according to the sub - process sequence and material requirements. Figure 2 Illustrate a two - dimensional grid diagram as an example of the final assembly process sequence, where W represents the assembly operation, M represents semi - finished or finished products, P represents the material unit, and the direction of the arrow represents the assembly operation sequence. As Figure 2 The shown two - dimensional grid diagram is a schematic representation of the final assembly process sequence determined by step 101.

[0026] In step 102, estimate the setup time and working time of each assembly operation of each sub - process in the final assembly process based on historical man - hour statistics and standard man - hour calculation methods, so as to estimate the total assembly time required to perform the final assembly of a single engine. In one example, historical man - hour statistics include the average man - hour, the longest man - hour, the shortest man - hour, etc. required to perform each assembly operation in history. In one example, historical man - hour statistics may include historical man - hour statistics with or without considering rework and repair. In one example, standard man - hours may include fixed man - hours for each operation in each assembly operation determined based on historical man - hour statistics. In one example, step 102 may include determining the total operation time required based on the fixed man - hours of each operation. In one example, it takes 10 s to tighten a screw and 20 s to move a part, etc. Based on this, the man - hours required to tighten 100 screws and move 100 parts can be calculated. In one example, based on the fixed man - hours of each operation, the total assembly time required to perform the final assembly of a single engine can be calculated. In some examples, the assembly time of an assembly operation includes setup time and working time. The assembly time may include the time for storing, transporting, and counting materials. The working time may include the time for actually performing assembly work at the work station. Step 102 may include estimating the total assembly time required to perform the final assembly of a single engine based on the setup time and working time of each assembly operation. In one example, the total assembly time is equal to the sum of the setup time and working time of each assembly operation. Figure 3 Illustrate the estimation of the setup time and working time of each assembly operation and the estimation of the total assembly time required to perform the final assembly of a single engine in the form of a VSM (Value Stream Mapping) analysis diagram.

[0027] Those skilled in the art should understand that the above historical man-hour statistics and standard man-hour calculation methods are merely examples. Any other applicable man-hour information and man-hour calculation methods are also covered when applicable to the solutions of this application.

[0028] In step 103, the number of workstations is calculated based on the total assembly time and the pulsation beat, where the pulsation beat is the interval time between two consecutive pulsations of the pulsating assembly line. In one example, calculating the number of workstations based on the total assembly time and the pulsation beat may include calculating the number of workstations according to Equation (1):

[0029]

[0030] where, n station is the number of workstations, t w is the total assembly time estimated according to step 102 (hours / unit), n hum is the rated number of workers per workstation (workers / unit), n shift is the number of teams per workstation (units). t e is the effective working time per person per day (hours / day). In one example, if a person works 8 hours a day and the work efficiency is 80%, then at this time t e is 6.4 hours / day. T p is the pulsation beat. More specifically, the pulsation beat can be the interval time between two consecutive movements of the pulsating assembly line required to assemble one engine. In one example, the pulsation beat can be determined based on the expected production volume, where T p = total available time / expected production volume (days / unit). In one example, in the case where the expected production volume is 600 units and the total available time in a year is 300 days, T p can be determined to be 0.5 days / unit, that is, the pulsating assembly line pulsates once every 0.5 days. In some examples, T p = α × total available time / expected production volume, where α is a redundancy factor that can be selected from the range of 0.80 - 0.99 to ensure that the pulsation beat can still guarantee that the production volume meets the expected order requirements in case of situations affecting production. In some examples, the number of workers in Equation (1) can be replaced by the number of robots.

[0031] In step 104, assembly operations are assigned to each workstation based on the number of workstations and the total assembly time.

[0032] In some examples, allocating assembly operations to each station based on the number of stations, the total assembly time, and the number of sub - processes may include: allocating assembly operations to each station in a way that evenly distributes the assembly time according to the total assembly time and the number of stations. In one example, the number of stations may be the number of stations calculated according to step 103, and the total assembly time may be the total assembly time estimated according to step 102. In the case where the general assembly process of an aero - engine includes fan unit assembly, core engine main unit assembly, turbine unit assembly, accessory assembly, and pre - test inspection sub - processes, allocating assembly operations to each station in a way that evenly distributes the assembly time according to the total assembly time and the number of stations may include dividing the total assembly time by the number of stations as the assembly time benchmark for each station, and allocating assembly operations to each station according to the general assembly process sequence and the time of each assembly operation. Taking Figure 3 the estimation of the preparation time and working time of each shown assembly operation, the estimation of the total assembly time, and the general assembly process sequence as an example, assuming the total assembly time is 200 hours and the calculated number of stations is 4, then the assembly time for each station is based on 50 hours. At the critical 50 - hour mark, the assembly time is rounded up and assigned to the previous station according to the assembly operation. In this example, Figure 3 the assembly operation shown in the first row of Figure 3 is assigned to station 1 (assembly time 55 hours),

[0033] Those skilled in the art should understand that the above - mentioned method of taking the quotient of the total assembly time and the number of stations as the benchmark and rounding up to the previous station at the critical benchmark value is only an example of allocating assembly operations to each station in a way that evenly distributes the assembly time. Any other applicable allocation method is also covered in the case of being applicable to the solution of this application. For example, taking the quotient of the total assembly time and the number of stations as the benchmark and rounding down to the next station at the critical benchmark value.

[0034] In step 105, adjust the configuration of the pulsating assembly line based on the balance rate of the pulsating assembly line. In one example, adjusting the configuration of the pulsating assembly line based on the balance rate of the pulsating assembly line may include calculating the balance rate of the pulsating assembly line and adjusting the configuration of the pulsating assembly line according to the calculated balance rate. In one example, calculating the balance rate of the pulsating assembly line may include calculating the production cycle of each station and determining the maximum production cycle among them, where the production cycle is the time required for each station to complete the assigned assembly operation. In one example, calculating the balance rate of the pulsating assembly line may further include calculating the balance rate of the pulsating assembly line based on the maximum production cycle according to formula (2):

[0035] p = tw × 100% / (n station × CT max ) (2)

[0036] Wherein, p is the balance rate, and t w is the total assembly time estimated according to step 102, n station is the number of workstations calculated in step 103, and CT max is the maximum production tact time.

[0037] In some examples, adjusting the configuration of the pulsating assembly line according to the calculated balance rate may include: when the balance rate is lower than the first threshold but higher than the second threshold, increasing or decreasing the assembly operations assigned to each workstation, or adjusting the general assembly process sequence until the balance rate of the adjusted pulsating assembly line reaches the first threshold. In some examples, the first threshold may be selected from the range of 80% - 90%, and the second threshold may be selected from the range of 50% - 60%. In one example, the first threshold may be selected as 85%, and the second threshold may be selected as 55%. In some examples, when the balance rate calculated according to formula (2) is greater than 55% but less than 85%, increasing or decreasing the assembly operations assigned to each workstation may include reducing the assembly operations assigned to workstation No. 1. For example, adjusting the assembly operation of adjusting the VSV originally assigned to workstation No. 1 to be assigned to workstation No. 2. In some examples, when the balance rate calculated according to formula (2) is greater than 55% but less than 85%, adjusting the general assembly process sequence may include adjusting the assembly operations of installing the fan blades and the intake cone in the fan unit body assembly sub-process to after the turbine unit body sub-process. In some examples, after increasing or decreasing the assembly operations assigned to each workstation or adjusting the general assembly process sequence, calculate the balance rate of the pulsating assembly line to determine whether the balance rate reaches the first threshold, such as 85%. If not, continue to adjust the configuration of the pulsating assembly line by increasing or decreasing the assembly operations assigned to each workstation or adjusting the general assembly process sequence.

[0038] In some examples, in the case of rounding up to the previous workstation at the critical reference value based on the quotient of the total assembly time and the number of workstations, the assembly operations at the critical reference value may have a relatively long assembly time, such as Figure 3The pipeline assembly 1 (33 hours), pipeline assembly 2 (23 hours), and cable assembly 1 (25 hours) shown in [figure]. At this time, in the case where the total assembly time is 200 hours, whether such assembly operations are classified upward into the previous station or downward into the subsequent station, it will cause a significant decrease in the balance rate. Therefore, in some examples of the present application, adjusting the configuration of the pulsating assembly production line according to the calculated balance rate may further include: when the balance rate is lower than the second threshold, increasing the number of stations by a difference value, and distributing the assembly operations to each station based on the increased number of stations, the total assembly time, and the number of sub-processes until the balance rate of the adjusted pulsating assembly production line reaches the second threshold. In some examples, the difference value can be selected from ±1, ±2, ±3. In some examples, the second threshold can be selected from the range of 50% - 60%. In one example, the second threshold can be selected as 55%. In this example, when the balance rate calculated according to formula (2) is less than 55%, the number of stations calculated according to step 103 is increased by a difference value. For example, the number of stations 4 calculated according to step 103 is increased by 1 to become 5. Then, in the case where the total assembly time is 200 hours, the assembly time of each station is based on 200 / 5 = 40 hours, and at the critical 40 hours, the assembly time is rounded up to the previous station according to the assembly operation sequence. In this example, Figure 3 The first assembly operation (lifting the fan unit body) in the first row to the fifth assembly operation (installing the direct pipeline) in the first row in [figure] are assigned to station 1 (assembly time 43 hours), the sixth assembly operation (installing the 4 - fulcrum nut) in the first row to the fourth assembly operation (installing the bracket) in the second row are assigned to station 2 (assembly time 42 hours), and so on. After adjusting the pulsating assembly production line in this way, calculate the balance rate of the pulsating assembly production line to determine whether the balance rate reaches the second threshold, such as 55%. If not, continue to adjust the configuration of the pulsating assembly production line by increasing the number of stations by the difference value. Figure 4 is configured according to Figure 1 the configuration method of the pulsating assembly production line shown in [figure]. Figure 4 The process sequence and station division configured with 6 stations are illustrated from left to right in [figure], where station 1 is the fan main unit - core machine main unit assembly, station 2 is the fan core machine combined unit - low - pressure turbine main unit assembly, station 3 is the external accessory assembly, station 4 is the fan blade assembly, station 5 is the external pipeline assembly, and station 6 is the delivery inspection.

[0039] In some embodiments, a configuration method 100 for a pulsating assembly production line for aero-engine final assembly may further include step 106 (not shown) and step 107 (not shown). In some examples, step 106 may include determining the plant layout of the engine production line based on the pulsating assembly production line determined in steps 101 - 105. In some examples, step 107 may include constructing a three-dimensional model of the plant layout of the engine production line and performing process simulation and analysis of the pulsating assembly production line based on this three-dimensional model. In one example, the constructed three-dimensional model includes the plant environment, the production line support frame, the production line transportation system, the lightweight model of the aero-engine, the aero-engine tooling equipment, etc. In one example, performing process simulation and analysis of the pulsating assembly production line based on this three-dimensional model may include using, but not limited to, motion simulation tools such as Tecnomatix, Adams, etc. to simulate the assembly process of the pulsating production line, so as to verify and analyze the feasibility and rationality of the process.

[0040] Those skilled in the art should understand that the above example of allocating assembly operations to each station by taking the quotient of the total assembly time and the number of stations as the benchmark and rounding up to the previous station at the critical benchmark value is just one example of evenly distributing the assembly time. Any other applicable allocation method is also covered in the case of being applicable to the solution of this application. For example, taking the quotient of the total assembly time and the number of stations as the benchmark and rounding down to the next station at the critical benchmark value.

[0041] Thus, the number of stations calculated in step 103 depends on the expected output, and the balance rate calculated in step 105 is used to adjust the configuration of the pulsating assembly production line, including increasing or decreasing the assembly operations assigned to each station, or adjusting the final assembly process sequence and changing the number of stations calculated in step 103, so as to achieve improving the resource utilization rate of the production line while coordinating production efficiency.

[0042] It should be noted that the above method describes possible implementations, and the operations and steps can be rearranged or otherwise modified and other implementations are also possible. In addition, aspects from two or more methods can be combined.

[0043] As used herein, including in the claims, the "or" used in a list of items (e.g., a list of items accompanied by language such as "at least one of" or "one or more of") indicates an inclusive listing such that, for example, the listing of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Similarly, as used herein, the phrase "based on" should not be construed as reciting a closed set of conditions. For example, an exemplary step described as being based on condition "A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be construed in the same manner as the phrase "at least partially based on".

[0044] In the drawings, like components or features may have the same reference numeral. Additionally, each of the same type of components may be distinguished by following the reference numeral with a dash and a second label that differentiates between similar components. If only the first reference numeral is used in the specification, the description may apply to any one of the similar components having the same first reference numeral regardless of the second reference numeral, or any other subsequent reference numerals.

[0045] The description set forth herein in connection with the drawings describes example configurations and does not represent all examples that may be implemented or fall within the scope of the claims. The term "exemplary" as used herein means "serving as an example, instance, or illustration" and does not mean "superior to" or "better than" other examples. This detailed description includes specific details to provide an understanding of the described technologies. However, the technologies may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0046] The description provided herein is to enable a person skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A configuration method for a pulsating assembly production line for aero-engine final assembly, comprising: Determining the final assembly process sequence according to the sequence and material requirements of the sub-processes of the aero-engine final assembly process; Estimating the preparation time and working time of each assembly operation of each sub-process in the final assembly process based on historical man-hour statistics and standard man-hour calculation methods, so as to estimate the total assembly time required for assembling a single engine; Calculating the number of workstations based on the total assembly time and the pulsating beat, where the pulsating beat is the interval time between two consecutive pulsations of the pulsating assembly production line; Allocating assembly operations to each workstation based on the number of workstations and the total assembly time; And Adjusting the configuration of the pulsating assembly production line based on the balance rate of the pulsating assembly production line.

2. The method according to claim 1, wherein Allocating assembly operations to each workstation based on the number of workstations and the total assembly time includes: Allocating assembly operations to each workstation in a way that evenly distributes the assembly time according to the total assembly time and the number of workstations.

3. The method according to claim 1, characterized in that Calculating the number of workstations based on the total assembly time and the pulsating beat includes calculating the number of workstations according to the following formula: Among them, n station is the number of workstations, t w is the total assembly time, n hum is the rated number of workers for each workstation, t e is the effective working hours per person per day, n shift is the number of teams for each workstation, T p is the pulsating beat and is determined based on the expected output, where T p = total available time / expected output.

4. The method according to claim 1, wherein The balance rate of the pulsating assembly production line is calculated as follows: Calculating the production beat of each workstation and determining the maximum production beat, where the production beat is the time required for each workstation to complete the assigned assembly operation; Calculating the balance rate of the pulsating assembly production line based on the maximum production beat according to the following formula: p = t w × 100% / (n station × CT max ) Among them, p is the balance rate, t w is the total assembly time, n station is the number of workstations, CT max is the maximum production tact time.

5. The method according to claim 4, characterized in that, Adjusting the configuration of the pulsating assembly production line based on the balance rate of the pulsating assembly production line includes: When the balance rate is lower than the first threshold but higher than the second threshold, increasing or decreasing the assembly operations assigned to each workstation, or adjusting the final assembly process sequence, until the balance rate of the adjusted pulsating assembly production line reaches the first threshold; When the balance rate is lower than the second threshold, increasing the number of workstations by a difference, and allocating assembly operations to each workstation based on the increased number of workstations and the total assembly time in combination with the number of sub-processes, until the balance rate of the adjusted pulsating assembly production line reaches the second threshold.

6. The method according to claim 5, wherein The first threshold is selected from the range of 80%-90%, and the second threshold is selected from the range of 50%-60%.

7. The method according to claim 5, characterized in that The difference is selected from ±1, ±2, ±3.

8. The method according to claim 1, characterized in that, The content and number of the sub-processes depend on the type of aero-engine.

9. The method according to claim 1, wherein The sub-processes of the aero-engine final assembly process include fan unit assembly, core engine main unit assembly, turbine unit assembly, accessory assembly, and pre-test inspection, and each sub-process includes multiple assembly operations with adjustable sequences.

10. The method according to claim 1, wherein, The standard man-hour calculation method includes determining the fixed man-hour of each operation in each assembly operation based on historical man-hour statistics, and determining the total man-hour required based on the fixed man-hour of each operation.

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