Method, device, equipment and medium for assembling aircraft system pipe frame tube joint

Abstract

The application discloses an aircraft system pipeline frame-penetrating pipe joint assembly method, device, equipment and medium, relates to the assembly technical field of the frame-penetrating pipe joint of an aircraft. The method comprises the following steps: acquiring a plurality of sizes of a target frame-penetrating pipe joint; obtaining an axial pre-tightening load model generated at an interference connection between a reinforcing boss of a structural frame and the target frame-penetrating pipe joint; obtaining a minimum interference amount model between the reinforcing boss and the target frame-penetrating pipe joint; obtaining a stress model of any point on a flange in the target frame-penetrating pipe joint; obtaining a maximum interference amount model between the reinforcing boss and the target frame-penetrating pipe joint; and assembling the target frame-penetrating pipe joint based on the minimum interference amount model and the maximum interference amount model. In the application, the allowed interference amount size range between the reinforcing boss and the connecting hole of the frame-penetrating pipe joint is more convenient, faster and more accurate to obtain, and therefore, the frame-penetrating pipe joint is more conducive to assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aircraft frame-penetration pipe joint assembly, and particularly to an aircraft system pipeline frame-penetration pipe joint assembly method, device, equipment and medium. BACKGROUND

[0002] When the aircraft system pipeline penetrates the structure frame, the frame-penetration pipe joint is generally fixed on the reinforcing boss of the structure frame by rivet or bolt connection, and the frame-penetration pipe joint includes a flange, a connecting hole and a joint pipe wall. When designing the frame-penetration pipe joint, the number and position of the connecting pieces need to be determined, and at the same time, the size of the flange of the frame-penetration pipe joint and the reinforcing boss is large in order to ensure that the edge distance meets the strength requirement. When assembling the frame-penetration pipe joint, the reinforcing boss on the structure frame needs to be fixed in the connecting hole of the frame-penetration pipe joint, and the reinforcing boss on the structure frame and the connecting hole of the frame-penetration pipe joint are in interference fit.

[0003] However, the size of the allowable interference amount between the reinforcing boss on the structure frame and the connecting hole of the frame-penetration pipe joint is not clear in the prior art, which is not conducive to the installation of the reinforcing boss in the connecting hole, and further not conducive to the assembly of the frame-penetration pipe joint. SUMMARY

[0004] The main purpose of the present application is to provide an aircraft system pipeline frame-penetration pipe joint assembly method, device, equipment and medium, which aims to solve the technical problem that the size of the allowable interference amount between the reinforcing boss on the structure frame and the connecting hole of the frame-penetration pipe joint is not clear in the prior art, which is not conducive to the installation of the reinforcing boss in the connecting hole, and further not conducive to the assembly of the frame-penetration pipe joint.

[0005] To achieve the above-mentioned purpose, the first aspect of the present application provides an aircraft system pipeline frame-penetration pipe joint assembly method, which comprises:

[0006] obtaining a plurality of sizes of a target frame-penetration pipe joint;

[0007] obtaining an axial pre-tightening load model generated at the interference connection between the reinforcing boss of the structure frame and the target frame-penetration pipe joint based on the surface contact pressure between the target frame-penetration pipe joint and the reinforcing boss of the structure frame;

[0008] obtaining a minimum interference amount model between the reinforcing boss and the target frame-penetration pipe joint based on a preset first safety factor, the plurality of sizes of the target frame-penetration pipe joint and the axial pre-tightening load model;

[0009] obtaining a stress model of any point on the flange of the target frame-penetration pipe joint based on the radial stress, the ring stress and the equivalent maximum axial stress of the flange of the target frame-penetration pipe joint;

[0010] obtaining a maximum interference amount model between the reinforcing boss and the target tube-to-tube sheet joint based on the preset second safety coefficient and the stress model;

[0011] assembling the target tube-to-tube sheet joint based on the minimum interference amount model and the maximum interference amount model.

[0012] Optionally, the assembling the target tube-to-tube sheet joint based on the minimum interference amount model and the maximum interference amount model comprises:

[0013] obtaining a tolerance model of an outer diameter of a flange in the target tube-to-tube sheet joint based on the minimum interference amount model and the maximum interference amount model;

[0014] obtaining a manual assembly interference amount between the reinforcing boss and the target tube-to-tube sheet joint based on a preset third safety coefficient and the outer diameter of the flange in the target tube-to-tube sheet joint;

[0015] obtaining an actual interference amount between the reinforcing boss and the target tube-to-tube sheet joint based on an assembly condition between the reinforcing boss and the target tube-to-tube sheet joint and the tolerance model of the outer diameter of the flange in the target tube-to-tube sheet joint;

[0016] comparing the manual assembly interference amount and the actual interference amount to assemble the target tube-to-tube sheet joint.

[0017] Optionally, the comparing the manual assembly interference amount and the actual interference amount to assemble the target tube-to-tube sheet joint comprises:

[0018] manually assembling the target tube-to-tube sheet joint in a case that the actual interference amount is less than or equal to the manual assembly interference amount;

[0019] pressing the target tube-to-tube sheet joint in a case that the actual interference amount is greater than or equal to the manual assembly interference amount.

[0020] Optionally, the obtaining the actual interference amount between the reinforcing boss and the target tube-to-tube sheet joint based on the assembly condition between the reinforcing boss and the target tube-to-tube sheet joint and the tolerance model of the outer diameter of the flange in the target tube-to-tube sheet joint comprises:

[0021] the actual interference amount is obtained by the following formula:

[0022] δ1=x-(T1-T2)*b*ε

[0023] Wherein, δ1 represents the actual interference parameter, x represents the tolerance model of the outer diameter of the flange in the target tube penetration joint, T1 represents the ambient temperature when the target tube penetration joint is assembled, T2 represents the temperature after cooling when the target tube penetration joint is assembled, b represents the outer diameter of the flange in the target tube penetration joint, and ε represents the thermal expansion coefficient of the target tube penetration joint.

[0024] The manual assembly interference between the reinforcing boss and the target tube penetration joint is obtained based on the third preset safety coefficient and the outer diameter of the flange in the target tube penetration joint, and the manual assembly interference includes:

[0025] The manual assembly interference is obtained by the following formula:

[0026] δ2 = -k3 * b

[0027] Wherein, δ2 represents the manual assembly interference parameter, and k3 represents the third safety coefficient.

[0028] The tolerance model of the outer diameter of the flange in the target tube penetration joint is obtained based on the minimum interference model and the maximum interference model, and the tolerance model of the outer diameter of the flange in the target tube penetration joint includes:

[0029] The tolerance model of the outer diameter of the flange in the target tube penetration joint is obtained by the following formula:

[0030] x = n1 + n2 + δ min

[0031] Wherein, n1 represents the upper deviation of the outer diameter of the reinforcing boss, n2 represents the lower deviation of the outer diameter of the flange in the target tube penetration joint, and δ min represents the minimum interference model.

[0032] Optionally, the axial pre-tightening load model generated at the interference connection between the reinforcing boss of the structure frame and the target tube penetration joint is obtained based on the surface contact pressure between the reinforcing boss of the structure frame and the target tube penetration joint, and the axial pre-tightening load model includes:

[0033] The surface contact pressure model between the flange in the target tube penetration joint and the reinforcing boss is obtained.

[0034] The surface contact pressure model between the flange in the target tube penetration joint and the reinforcing boss is obtained.

[0035] Optionally, the surface contact pressure model between the flange in the target tube penetration joint and the reinforcing boss is obtained by:

[0036] The surface contact pressure model is obtained by the following relationship:

[0037]

[0038] wherein p represents a surface contact pressure model, E represents an elastic modulus of the frame tube joint or the reinforcing boss, δ1 represents a first interference amount model, and a represents an inner diameter of a flange of the frame tube joint;

[0039] The axial pre-tightening load model generated at the interference connection between the reinforcing boss and the target frame tube joint is obtained based on the surface contact pressure model between the flange and the reinforcing boss in the target frame tube joint, and includes:

[0040] The axial pre-tightening load model is obtained by the following relationship:

[0041] F1 = μ * π * b 2 *t2 * p

[0042] wherein F1 represents the axial pre-tightening load, μ represents a friction coefficient between the flange of the frame tube joint and the surface of the reinforcing boss, and t2 represents a thickness of the reinforcing boss.

[0043] Optionally, the minimum interference amount model between the reinforcing boss and the target frame tube joint is obtained based on a preset first safety factor, a plurality of sizes of the target frame tube joint, and the axial pre-tightening load model, and includes:

[0044] The first interference amount model is obtained by the following relationship:

[0045]

[0046] F1 ≥ k1 * F2

[0047] wherein F2 represents an axial maximum allowable load of the frame tube joint, and k1 represents the first safety factor.

[0048] The minimum interference amount model is obtained by the following relationship:

[0049]

[0050] wherein δ min represents the minimum interference amount model, μ min represents a minimum friction coefficient between the flange of the frame tube joint and the surface of the reinforcing boss.

[0051] Optionally, the stress model of any point on the flange in the target frame tube joint is obtained based on a radial stress, an annular stress, and an equivalent maximum axial stress of the flange in the target frame tube joint, and includes:

[0052] The stress model of any point on the flange in the target frame tube joint is obtained by the following relationship:

[0053]

[0054]

[0055]

[0056]

[0057] wherein σ st represents a stress model of any point on the flange in the target frame-penetrating pipe joint, σ ρ represents a radial stress of the flange in the target frame-penetrating pipe joint, represents a hoop stress of the flange in the target frame-penetrating pipe joint, σ γ represents an equivalent maximum axial stress generated in the flange during assembly of the target frame-penetrating pipe joint; and ρ represents a coordinate of any point inside the flange in the target frame-penetrating pipe joint.

[0058] Optionally, the maximum interference amount model between the reinforcing boss and the target frame-penetrating pipe joint is obtained based on the preset second safety factor and the stress model, and the method comprises the following steps of:

[0059] The second interference amount model is obtained through the following relationship:

[0060]

[0061] k2*σ st ≤σ s

[0062] wherein δ2 represents the second interference amount model, k2 represents the second safety factor, σ s represents a material yield stress;

[0063] The maximum interference amount model is obtained through the following relationship:

[0064]

[0065] wherein δ max represents the maximum interference amount model, μ min represents a minimum friction coefficient between the flange of the frame-penetrating pipe joint and the surface of the reinforcing boss.

[0066] In a second aspect, an aircraft system pipe frame-penetrating pipe joint assembly device is provided, and the device comprises:

[0067] An acquisition module is configured to acquire a plurality of dimensions of a target frame-penetrating pipe joint.

[0068] a first obtaining module, configured to obtain an axial pre-tightening load model of an interference connection between the reinforcing boss of the structural frame and the target frame-penetrating pipe joint based on a surface contact pressure between the target frame-penetrating pipe joint and the reinforcing boss of the structural frame;

[0069] a second obtaining module, configured to obtain a minimum interference amount model between the reinforcing boss and the target frame-penetrating pipe joint based on a preset first safety coefficient, a plurality of sizes of the target frame-penetrating pipe joint, and the axial pre-tightening load model;

[0070] a third obtaining module, configured to obtain a stress model of any point on a flange in the target frame-penetrating pipe joint based on a radial stress, an annular stress, and an equivalent maximum axial stress of the flange in the target frame-penetrating pipe joint;

[0071] a fourth obtaining module, configured to obtain a maximum interference amount model between the reinforcing boss and the target frame-penetrating pipe joint based on a preset second safety coefficient and the stress model;

[0072] an assembling module, configured to assemble the target frame-penetrating pipe joint based on the minimum interference amount model and the maximum interference amount model.

[0073] In a second aspect, an aircraft system pipeline frame-penetrating pipe joint assembling device is provided, and the device comprises:

[0074] an acquisition module, configured to acquire a plurality of sizes of a target frame-penetrating pipe joint;

[0075] a first obtaining module, configured to obtain an axial pre-tightening load model of an interference connection between the reinforcing boss of the structural frame and the target frame-penetrating pipe joint based on a surface contact pressure between the target frame-penetrating pipe joint and the reinforcing boss of the structural frame;

[0076] a second obtaining module, configured to obtain a first interference amount model between the reinforcing boss and the target frame-penetrating pipe joint based on the plurality of sizes of the target frame-penetrating pipe joint, the first safety coefficient, and the axial pre-tightening load model;

[0077] a third obtaining module, configured to obtain a minimum interference amount model between the reinforcing boss and the target frame-penetrating pipe joint based on the first interference amount model;

[0078] a fourth obtaining module, configured to obtain a stress model of any point on a flange in the target frame-penetrating pipe joint based on a radial stress, an annular stress, and an equivalent maximum axial stress of the flange in the target frame-penetrating pipe joint;

[0079] a fifth obtaining module, configured to obtain a second interference amount model between the reinforcing boss and the target frame-penetrating pipe joint based on a preset second safety coefficient and the stress model;

[0080] a sixth obtaining module, configured to obtain a maximum interference amount model between the reinforcing boss and the target penetrating frame tube joint based on the second interference amount model;

[0081] a fitting module, configured to fit the target penetrating frame tube joint based on the minimum interference amount model and the maximum interference amount model.

[0082] In a third aspect, a computer device is provided, which includes a memory and a processor. The memory stores a computer program. The processor executes the computer program to implement the method in the embodiments.

[0083] In a fourth aspect, a computer readable storage medium is provided, which stores a computer program. The processor executes the computer program to implement the method in the embodiments.

[0084] Through the above technical solutions, the present application has at least the following beneficial effects:

[0085] The method comprises the following steps: acquiring a plurality of sizes of a target frame-penetrating pipe joint; obtaining an axial pre-tightening load model of an interference connection between a reinforcing boss of a structure frame and the target frame-penetrating pipe joint based on surface contact pressure between the target frame-penetrating pipe joint and the reinforcing boss of the structure frame; obtaining a minimum interference amount model between the reinforcing boss and the target frame-penetrating pipe joint based on a first safety coefficient, the plurality of sizes of the target frame-penetrating pipe joint and the axial pre-tightening load model; obtaining a stress model of any point on a flange in the target frame-penetrating pipe joint based on radial stress, annular stress and equivalent maximum axial stress of the flange in the target frame-penetrating pipe joint; obtaining a maximum interference amount model between the reinforcing boss and the target frame-penetrating pipe joint based on a second safety coefficient and the stress model; and finally assembling the target frame-penetrating pipe joint based on the minimum interference amount model and the maximum interference amount model. That is, when the frame-penetrating pipe joint is assembled by the method, a plurality of main sizes of the target frame-penetrating pipe joint are acquired first, then the minimum interference amount allowed between the flange in the target frame-penetrating pipe joint and the reinforcing boss is obtained from the perspective of axial pre-tightening load generated by the connection between the reinforcing boss and the target frame-penetrating pipe joint, and the maximum interference amount allowed between the flange in the target frame-penetrating pipe joint and the reinforcing boss is obtained from the stress state of any point on the flange in the target frame-penetrating pipe joint. Then, based on the maximum interference amount and the minimum interference amount, the interference amount between the connecting hole of the flange in the target frame-penetrating pipe joint and the reinforcing boss is between the maximum interference amount and the minimum interference amount, and it is considered that the assembly requirement between the target frame-penetrating pipe joint and the reinforcing boss is met. That is, the range of the interference amount allowed between the reinforcing boss and the connecting hole of the frame-penetrating pipe joint is more convenient, faster and more accurate to obtain. Therefore, the interference amount range is more conducive to installing the reinforcing boss in the connecting hole of the target frame-penetrating pipe joint, thereby being more conducive to assembling the frame-penetrating pipe joint. Meanwhile, since the interference fit exists between the reinforcing boss and the frame-penetrating pipe joint, the design method that the frame-penetrating pipe joint is uniformly distributed and connected by bolt holes and bolts between the traditional system pipe frame-penetrating pipe joint and the reinforcing boss is replaced, and the repeated process of hole making and connection between the traditional frame-penetrating pipe joint and the structure frame is avoided. The pre-tightening force generated by the interference fit between the frame-penetrating pipe joint and the reinforcing boss of the structure frame directly achieves the fastening effect, which not only reduces the weight of the aircraft caused by the connection of standard parts, but also reduces the large amount of repeated work of model building of designers, process specification and instruction preparation of process personnel and construction of operators caused by the hole making and connection of the frame-penetrating pipe joint and the structure frame, thereby improving the assembly efficiency of the frame-penetrating pipe joint. BRIEF DESCRIPTION OF DRAWINGS

[0086] Figure 1 A computer device structure schematic diagram of a hardware running environment related to the embodiments of the present application;

[0087] Figure 2 A flowchart of an aircraft system pipeline frame-penetrating pipe joint assembly method provided by an embodiment of the present application is shown in FIG. 1.

[0088] Figure 3 A schematic diagram of a plane stress state of any point on the flange in the target frame-penetrating pipe joint provided by an embodiment of the present application is shown in FIG. 4.

[0089] Figure 4 A flowchart of a specific execution method of step S15 of the present application is shown in FIG. 5.

[0090] Figure 5 A schematic diagram of an aircraft system pipeline frame-penetrating pipe joint assembly device provided by an embodiment of the present application is shown in FIG. 6.

[0091] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0092] It should be understood that the specific embodiments described herein are merely intended to explain the present application and are not intended to limit the present application.

[0093] When the aircraft system pipeline penetrates the structural frame, the frame-penetrating pipe joint is generally fixed on the reinforcing boss of the structural frame by rivet or bolt connection, and the frame-penetrating pipe joint includes a flange, a connecting hole and a joint pipe wall. When designing the frame-penetrating pipe joint, the number and position of the connecting pieces need to be determined, and at the same time, the size of the flange of the frame-penetrating pipe joint and the reinforcing boss needs to be large to ensure that the edge distance meets the strength requirement. When assembling the frame-penetrating pipe joint, a large number of repetitive process work such as hole making, deburring, tightening or riveting needs to be performed; the current pipe joint connection form has the following two problems: the connection by rivets, bolts and other connecting pieces increases the weight of the frame-penetrating pipe joint and the weight of the entire aircraft; the hole opening and connection of the pipe joint and the frame involve a large amount of repetitive work of model building by designers, process specification preparation by process personnel and construction by workers. At the same time, the reinforcing boss on the structural frame needs to be fixed in the connecting hole of the frame-penetrating pipe joint, and the reinforcing boss on the structural frame and the connecting hole of the frame-penetrating pipe joint are in interference fit.

[0094] However, the size of the allowable interference between the reinforcing boss on the structural frame and the connecting hole of the frame-penetrating pipe joint is currently unknown, which is not conducive to the installation of the reinforcing boss in the connecting hole, and further not conducive to the assembly of the frame-penetrating pipe joint.

[0095] To solve the above technical problems, the present application provides an aircraft system pipeline frame-penetrating pipe joint assembly method, device, equipment and medium. Before introducing the specific technical scheme of the present application, the hardware operating environment involved in the embodiment of the present application is introduced.

[0096] Referring toFigure 1 , Figure 1 This is a schematic diagram of the computer device structure of the hardware operating environment involved in the embodiments of this application.

[0097] like Figure 1 As shown, the computer device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen and an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as a disk drive. The memory 1005 may also optionally be a storage device independent of the aforementioned processor 1001.

[0098] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the computer device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0099] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a data storage module, a network communication module, a user interface module, and electronic programs.

[0100] exist Figure 1 In the computer device shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the computer device of the present invention can be set in the computer device, and the computer device calls the aircraft system pipeline through-frame pipe joint assembly device stored in the memory 1005 through the processor 1001, and executes the aircraft system pipeline through-frame pipe joint assembly method provided in the embodiment of this application.

[0101] Reference Figure 2 Based on the hardware environment of the foregoing embodiments, embodiments of this application provide a method for assembling through-frame pipe fittings for aircraft systems, the method comprising:

[0102] S10: Obtain several dimensions of the target frame-penetrating pipe joint.

[0103] In the specific implementation process, the target frame-penetrating pipe joint refers to a frame-penetrating pipe joint that needs to be matched with a reinforcing boss in a structural frame. The dimensions herein refer to the dimensions of key parts of the target frame-penetrating pipe joint, which can be obtained through conventional means. The fastening connection between the target frame-penetrating pipe joint and the structural frame is achieved through the pre-tightening force generated by the interference connection. Both the frame-penetrating pipe joint and the reinforcing boss are axisymmetric structures, mainly including a flange, a flange, an interference section, a chamfer between the boss and the flange, a chamfer of the reinforcing boss, a chamfer transition between the joint pipe wall and the flange, and other features. The size relationship requirements are as follows:

[0104] The flange thickness t0=(b-a) and 3.5≤t0≤5mm, the flange height t2+0.2≤h2≤t2+0.5; the flange thickness 2.5≤t1≤4mm, the flange width t0+3≤v1≤t0+6; the chamfer radius between the boss and the flange 0.15≤r1≤0.8h1, the relationship between the flange inner diameter a and the flange outer diameter b is b=a+t0; the boss thickness 3.5≤t2≤5mm, the boss chamfer 25°≤θ1≤40°, the boss chamfer height 0.2≤h1≤0.35mm; the chamfer angle θ2=θ1 between the flange and the flange; the outer surface of the flange and the inner surface of the hole on the reinforcing boss are oxide film and paint-free layer, and the friction coefficient between the flange and the reinforcing boss surface is measured through a typical friction coefficient test experiment, and the friction coefficient range is μ min ≤μ≤μ max .

[0105] S11: Based on the surface contact pressure between the target frame-penetrating pipe joint and the reinforcing boss of the structural frame, an axial pre-tightening load model generated at the interference connection between the reinforcing boss of the structural frame and the target frame-penetrating pipe joint is obtained.

[0106] In the specific implementation process, the surface contact pressure model between the flange of the target frame-penetrating pipe joint and the reinforcing boss is first obtained; then based on the surface contact pressure model between the flange of the target frame-penetrating pipe joint and the reinforcing boss, the axial pre-tightening load model generated at the interference connection between the reinforcing boss and the target frame-penetrating pipe joint is obtained.

[0107] Specifically, the surface contact pressure model is obtained through the following relationship:

[0108]

[0109] Wherein, p represents the surface contact pressure model, E represents the elastic modulus of the frame-penetrating pipe joint or the reinforcing boss, δ1 represents the first interference amount model, and a represents the inner diameter of the flange of the frame-penetrating pipe joint.

[0110] The axial preload model is obtained through the following relationship:

[0111] F1=μ*π*b 2 *t2*p

[0112] Where F1 represents the axial preload, μ represents the friction coefficient between the flange of the through-frame pipe joint and the surface of the reinforcing boss, and t2 represents the thickness of the reinforcing boss.

[0113] S12: Based on the preset first safety factor, several dimensions of the target through-frame pipe joint, and the axial preload model, obtain the minimum interference model between the reinforcing boss and the target through-frame pipe joint.

[0114] In the specific implementation process, the first safety factor k1 is preset to be in the range of 1.3 to 1.6, so that the axial preload F1 generated by the interference connection between the reinforcing boss and the target through-frame pipe joint must satisfy F1≥k1*F2.

[0115] Specifically, the first interference model is obtained through the following relationship:

[0116]

[0117] Where F2 represents the maximum allowable axial load of the through-frame pipe joint, and k1 represents the first safety factor;

[0118] The minimum interference model is obtained through the following relationship:

[0119]

[0120] Where, δ min This represents the minimum interference model, μ min This represents the minimum coefficient of friction between the flange and the reinforcing boss surface of the through-frame pipe joint.

[0121] S13: Based on the radial stress, circumferential stress and equivalent maximum axial stress of the flange in the target through-frame pipe joint, obtain the stress model of any point on the flange in the target through-frame pipe joint.

[0122] In the specific implementation process, the material yield stress σ s The Mies stress at any point in the flange is σ. st For the flange, neglecting shear stress, σ ρ , σ γ Consider it as a triaxial principal stress; such as Figure 3 As shown, polar coordinates are used to represent the stress state at any point on a plane perpendicular to the axis of the flange.

[0123] Specifically, a stress model of any point on the flange in the target through-wall pipe joint is obtained through the following relationship:

[0124]

[0125]

[0126]

[0127]

[0128] wherein σ st represents the stress model of any point on the flange in the target through-wall pipe joint, σ ρ represents the radial stress of the flange in the target through-wall pipe joint, represents the hoop stress of the flange in the target through-wall pipe joint, σ γ represents the equivalent maximum axial stress generated in the flange assembly process of the target through-wall pipe joint; and ρ represents the coordinate of any point inside the flange of the target through-wall pipe joint.

[0129] S14: obtaining a maximum interference amount model between the reinforcing boss and the target through-wall pipe joint based on the preset second safety factor and the stress model.

[0130] In the specific implementation process, the range of the second safety factor k2 is set to 1.5-2.5, so that the stress state of any point in the flange needs to meet k2*σ st ≤σ s ,

[0131] Specifically, the second interference amount model is obtained through the following relationship:

[0132]

[0133] wherein δ2 represents the second interference amount model, k2 represents the second safety factor, σ s represents the material yield stress.

[0134] Taking ρ=a and μ=μ min , that is, the maximum interference amount model is obtained through the following relationship:

[0135]

[0136] wherein δ max represents the maximum interference amount model, and μ min represents the minimum friction coefficient between the flange of the through-wall pipe joint and the surface of the reinforcing boss.

[0137] S15: assembling the target through-wall pipe joint based on the minimum interference amount model and the maximum interference amount model.

[0138] In the implementation process, when the interference amount between the reinforcing boss and the target frame pipe joint is between the minimum interference amount and the maximum interference amount, the interference amount is considered to meet the requirements, that is, the interference amount δ meets the range of the use requirements: δ min ≤δ≤δ max . Specifically, as shown in FIG. 15, step S15 includes the following steps: Figure 4

[0139] S151: obtaining a tolerance model of the flange outer diameter in the target frame pipe joint based on the minimum interference amount model and the maximum interference amount model.

[0140] In the implementation process, generally, the size tolerance of the hole on the reinforcing boss is δ The size tolerance of the flange outer diameter is δ According to δ min ≤δ≤δ max , n1, n2, x need to meet x≤δ max , x-n1-n2≥δ min , and in combination with the manufacturing and processing capacity of the actual machine tool, n1 and n2 should be as small as possible.

[0141] In order to facilitate the assembly of the pipe joint, the tolerance model of the flange outer diameter in the target frame pipe joint is obtained through the following formula:

[0142] x=n1+n2+δ min

[0143] Wherein, n1 represents the upper deviation of the reinforcing boss outer diameter, n2 represents the lower deviation of the flange outer diameter in the target frame pipe joint, and δ min represents the minimum interference amount model.

[0144] S152: obtaining the manual assembly interference amount between the reinforcing boss and the target frame pipe joint based on the preset third safety coefficient and the flange outer diameter in the target frame pipe joint.

[0145] In the implementation process, the third safety coefficient is preset as 0.001≤k3≤0.0015.

[0146] Specifically, the manual assembly interference amount is obtained through the following formula:

[0147] δ2=-k3*b

[0148] Wherein, δ2 represents the manual assembly interference amount parameter, and k3 represents the third safety coefficient.

[0149] ​S153: Obtain an actual interference amount between the reinforcing boss and the target frame-through pipe joint based on the assembly condition between the reinforcing boss and the target frame-through pipe joint and the tolerance model of the flange outer diameter in the target frame-through pipe joint.

[0150] In the specific implementation process, for the interference connection form of the frame-through pipe joint, the assembly methods that can be used include cooling assembly and press-in assembly; in combination with the preferred interference amount range δ min ≤ δ ≤ x, the thermal expansion coefficient ε of the frame-through pipe joint, the environment temperature T1 during assembly, and the temperature T2 that the frame-through pipe joint can be cooled to during assembly.

[0151] The actual interference amount is obtained through the following formula:

[0152] δ1 = x - (T1 - T2) * b * ε

[0153] wherein δ1 represents the actual interference amount parameter, x represents the tolerance model of the flange outer diameter in the target frame-through pipe joint, T1 represents the environment temperature of the target frame-through pipe joint during assembly, T2 represents the temperature of the target frame-through pipe joint during cooling during assembly, b represents the outer diameter of the flange in the target frame-through pipe joint, and ε represents the thermal expansion coefficient of the target frame-through pipe joint.

[0154] S154: Compare the manual assembly interference amount and the actual interference amount to assemble the target frame-through pipe joint.

[0155] In the specific implementation process, since the manual assembly interference amount between the target frame-through pipe joint and the reinforcing boss and the actual interference amount are different interference amount ranges, different assembly methods are adopted. Specifically, in the case where the actual interference amount is less than or equal to the manual assembly interference amount, i.e., δ1 ≤ δ2, the target frame-through pipe joint is manually assembled; in the case where the actual interference amount is greater than or equal to the manual assembly interference amount, i.e., δ1 ≥ δ2, the target frame-through pipe joint is not cooled, and the target frame-through pipe joint is press-in assembled.

[0156] More specifically, the target frame-penetration pipe joint is press-fitted, and a corresponding press-fitting clamp is required, which includes a bolt, a cover plate, a cover plate protective rubber pad, a support block protective rubber pad, a support block, and a nut. The key parameters of the assembly tool are as follows: the cover plate and the support block are generally made of tool steel, and the protective rubber pad is made of hard rubber; the cover plate, the cover plate protective rubber pad, the support block protective rubber pad, and the support block are all axisymmetric structures; the cover plate and the cover plate protective rubber pad, the support block protective rubber pad and the support block are connected with the minimum interference; the gap between the cover plate protective rubber pad and the inner wall of the pipe wall of the target frame-penetration pipe joint is less than 0.1 mm; the diameter of the bolt is greater than or equal to 6 mm, and the gap between the bolt and the hole of the cover plate and the gap between the bolt and the hole on the support block should be less than 0.1 mm; the inner diameter of the support block is b+x+0.3≤C≤b+x+0.6, wherein C represents the inner diameter of the support block.

[0157] The use of the press-fitting clamp mainly includes the following steps:

[0158] Step 1: Position the target frame-penetration pipe joint based on the chamfer between the pipe wall and the flange of the target frame-penetration pipe joint and the chamfer of the reinforcing boss.

[0159] Step 2: Press the cover plate to one end of the pipe joint by the bolt, and position the support block by the hole on the support block.

[0160] Step 3: First, tighten the nut with fingers, then use a wrench or other tool to tighten the bolt, and press the interference section of the pipe joint into the hole.

[0161] Step 4: After complete press-fitting, reverse the bolt and disassemble the assembly tool.

[0162] The above method will be discussed in conjunction with specific examples as follows:

[0163] Step 1: Determine the structure form of the target frame-penetration pipe joint and the key size relationship of the key parts.

[0164] The pre-tightening force generated by the interference is used to realize the fastening connection between the target frame-penetration pipe joint and the structure frame. The target frame-penetration pipe joint and the reinforcing boss are axisymmetric structures, mainly including a flange, a flange, an interference section, a chamfer between the boss and the flange, a chamfer of the reinforcing boss, a chamfer between the pipe wall of the joint and the flange, and other features. The key dimensions are as follows:

[0165] Flange thickness t0 = 4mm, flange height h2 = 4.3mm; flange thickness t1 = 3mm, flange width v1 = 8mm; fillet radius r1 = 0.15 between boss and flange; flange inner diameter a = 18mm, flange outer diameter b = 22mm; boss thickness t2 = 4mm, boss chamfer angle θ1 = 30°, boss chamfer height h1 = 0.25mm; chamfer angle θ2 = 30° between joint pipe wall and flange; target frame tube joint and reinforcing boss are both aluminum alloy 7075-T7351, flange outer surface and inner surface of reinforcing boss upper hole are oxidation film and paint-free layer, and the friction coefficient between flange and reinforcing boss surface is 0.15 ≤ μ ≤ 0.2 measured by typical friction coefficient test.

[0166] After determining the above dimensions, the interference δ is determined by steps two and three.

[0167] Step two, determine the interference δ range by building a mechanical model.

[0168] The maximum axial allowable load of the frame tube joint during the service of the aircraft is F2 = 5KN, the frame tube joint and the reinforcing boss are the same material, the elastic modulus E = 70Gpa, and the surface contact pressure p between the flange and the reinforcing boss is ignored during assembly. The axial pre-tightening load F1 generated by interference connection is μ * π * b 2 *t2 * p

[0169] Taking the safety factor k1 = 1.4, then

[0170] The material yield stress σ s = 420Mpa, the mises stress of any point in the flange is σ st , taking the safety factor k2 = 2, that is

[0171] The interference δ range that meets the use requirements is 0.015 ≤ δ ≤ 0.074mm.

[0172] Step three, optimize the interference range.

[0173] Generally, the size tolerance of the hole in the reinforcing boss The size tolerance of the flange outer diameter Then according to the 0.015 ≤ δ ≤ 0.074mm obtained in step two, n1, n2, x need to satisfy x ≤ 0.074mm, x-n1-n2 ≥ 0.015mm; in order to facilitate the assembly of the target frame tube joint, x = n1 + n2 + 0.015 is preferred, and combined with the actual machining capacity, the tolerance band of the hole is selected φ22H7, and the tolerance band of the shaft is selected φ22h6, then n1 = 0.021mm, n2 = 0.013mm;

[0174] The preferred interference range is 0.015≤δ≤0.049mm.

[0175] Step four, assembly method selection.

[0176] For the interference connection form of the target frame-through pipe joint, the assembly methods that can be used include cooling assembly and press-in assembly; in combination with the interference range determined in step three, the target frame-through pipe joint thermal expansion coefficient ε = 2.3 * 10 -5 / ℃, the factory environment temperature T1 = 20℃ during assembly, and the frame-through pipe joint can be cooled to T2 = -80℃ during assembly, then the actual interference δ1 = x-(T1-T2)*b*ε = -0.0016mm between the flange and the target frame-through pipe joint during cooling assembly; taking the value range of the coefficient k3 = 0.0012mm, the interference δ2 = -0.0264mm of the target frame-through pipe joint of this diameter is manually operated;

[0177] δ1>δ2, cooling assembly cannot be performed, and press-in assembly needs to be performed according to the method in step five.

[0178] Step five, tightening type assembly fixture and use method.

[0179] The press-in assembly fixture of the target frame-through pipe joint is composed of a bolt, a cover plate, a cover plate protection rubber pad, a support block protection rubber pad, a support block, and a nut; the key parameter requirements of the press-in assembly fixture are as follows:

[0180] The cover plate and the support block are made of tool steel, and the protection rubber pad is made of fluoroether rubber; the cover plate, the cover plate protection rubber pad, the support block protection rubber pad, and the support block are all axisymmetric structures; the interference between the cover plate and the cover plate protection rubber pad and between the support block protection rubber pad and the support block is 0.02-0.05mm; the gap between the cover plate protection rubber pad and the inner wall of the pipe wall of the joint is less than 0.1mm; the bolt diameter is 8mm, and the gap between the bolt and the hole of the cover plate and the gap between the bolt and the hole on the support block are less than or equal to 0.1mm, and the inner diameter C of the support block is 22.5mm.

[0181] The use of the press-in assembly fixture mainly includes the following steps:

[0182] a) positioning the pipe joint based on the chamfer between the pipe wall and the flange of the target frame-through pipe joint and the chamfer of the reinforcing boss;

[0183] b) pressing the cover plate to one end of the pipe joint through the bolt, and positioning the support block through the hole on the support block;

[0184] c) first tightening the nut with fingers, and then using a wrench or other tool to tighten the bolt, and pressing the interference section of the pipe joint into the hole;

[0185] d) After fully pressed, reverse screwing the bolt, and disassemble the assembly tool.

[0186] In summary, in the method for assembling the frame-penetrating pipe joint, the main dimensions of the target frame-penetrating pipe joint are obtained first, then the minimum interference amount allowed between the flange and the reinforcing boss in the target frame-penetrating pipe joint is obtained from the perspective of the axial pre-tightening load generated by the connection between the reinforcing boss and the target frame-penetrating pipe joint, the maximum interference amount allowed between the flange and the reinforcing boss in the target frame-penetrating pipe joint is obtained from the stress state of any point on the flange of the target frame-penetrating pipe joint. Then, based on the maximum interference amount and the minimum interference amount, the interference amount between the connecting hole of the flange of the target frame-penetrating pipe joint and the reinforcing boss is between the maximum interference amount and the minimum interference amount, which is considered to meet the assembly requirements between the target frame-penetrating pipe and the reinforcing boss. That is, the range of the allowed interference amount between the reinforcing boss and the connecting hole of the frame-penetrating pipe joint is obtained more conveniently, more quickly and more accurately. Therefore, based on the range of the interference amount, it is more beneficial to install the reinforcing boss in the connecting hole of the target frame-penetrating pipe joint, thereby more beneficial to assemble the frame-penetrating pipe joint. At the same time, since the interference fit is between the reinforcing boss and the frame-penetrating pipe joint, the design method of connecting the frame-penetrating pipe joint and the reinforcing boss through the evenly distributed hole positions and bolts in the traditional system pipeline frame-penetrating pipe joint is replaced, and the repeated process of drilling and connecting between the traditional frame-penetrating pipe joint and the structural frame is avoided. The pre-tightening force generated by the interference fit between the frame-penetrating pipe joint and the reinforcing boss of the structural frame directly achieves the fastening effect, which not only reduces the weight of the aircraft caused by the connection of standard parts, but also reduces the large amount of repeated work of the design personnel in modeling, the process personnel in preparing process specifications and instructions, and the operating workers in construction caused by the drilling and connection of the frame-penetrating pipe joint and the structural frame, thereby improving the assembly efficiency of the frame-penetrating pipe joint.

[0187] In another embodiment, as shown in FIG. 6, based on the same inventive idea as the foregoing embodiment, the embodiment of the present application also provides an assembly device for a frame-penetrating pipe joint of an aircraft system pipeline, which comprises: Figure 5 The obtaining module is configured to obtain a plurality of dimensions of a target frame-penetrating pipe joint.

[0188] The first obtaining module is configured to obtain an axial pre-tightening load model generated at the interference fit between the reinforcing boss of the structural frame and the target frame-penetrating pipe joint based on the surface contact pressure between the target frame-penetrating pipe joint and the reinforcing boss of the structural frame.

[0189] The second obtaining module is configured to obtain a first interference amount model between the reinforcing boss and the target frame-penetrating pipe joint based on the plurality of dimensions of the target frame-penetrating pipe joint, the first safety factor and the axial pre-tightening load model.

[0190]

[0191] ​a third obtaining module, configured to obtain a minimum interference amount model between the reinforcing boss and the target frame tube joint based on the first interference amount model;

[0192] a fourth obtaining module, configured to obtain a stress model of any point on the flange in the target frame tube joint based on the radial stress, the hoop stress and the equivalent maximum axial stress of the flange in the target frame tube joint;

[0193] a fifth obtaining module, configured to obtain a second interference amount model between the reinforcing boss and the target frame tube joint based on a preset second safety coefficient and the stress model;

[0194] a sixth obtaining module, configured to obtain a maximum interference amount model between the reinforcing boss and the target frame tube joint based on the second interference amount model;

[0195] an assembling module, configured to assemble the target frame tube joint based on the minimum interference amount model and the maximum interference amount model.

[0196] It should be noted that the modules in the aircraft system pipeline frame tube joint assembling device in the embodiment are one-to-one corresponding to the steps in the aircraft system pipeline frame tube joint assembling method in the foregoing embodiment, and therefore, the specific implementation manners and the achieved technical effects of the embodiment can refer to the implementation manners of the aircraft system pipeline frame tube joint assembling method, which will not be described herein again.

[0197] In addition, in an embodiment, the present application further provides a computer device, which comprises a processor, a memory and a computer program stored in the memory, and the computer program realizes the method in the foregoing embodiment when executed by the processor.

[0198] In addition, in an embodiment, the present application further provides a computer storage medium, which stores a computer program, and the computer program realizes the method in the foregoing embodiment when executed by a processor.

[0199] In some embodiments, the computer readable storage medium can be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, flash memory, magnetic surface memory, optical disc or CD-ROM; or various devices comprising one or any combination of the above memories. The computer can be various computing devices including smart terminals and servers.

[0200] In some embodiments, executable instructions can take the form of programs, software, software modules, scripts, or code, written in any form of programming language, including compiled or interpreted languages, or declarative or procedural languages; and they can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.

[0201] By way of example, an executable instruction can, but need not, correspond to a file in a file system. An executable instruction can be stored in one or more files, in a portion of a file, in a single file that contains many instructions, in a single file that contains one or more instructions, in a single file that contains many instructions, in a single file that contains one or more instructions, in a single file that contains many instructions, or in many files.

[0202] By way of example, an executable instruction can, but need not, correspond to a file in a file system. An executable instruction can be stored in one or more files, in a portion of a file, in a single file that contains many instructions, in a single file that contains one or more instructions, in a single file that contains many instructions, in a single file that contains one or more instructions, in a single file that contains many instructions, or in many files.

[0203] It has to be noted that, as used herein, the terms "includes" and / or "contains", or any other tautological variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0204] The above-mentioned sequence numbers of the embodiments of the present application are only for description, and do not represent advantages or disadvantages of the embodiments.

[0205] Those skilled in the art can clearly understand the above-mentioned embodiment method by means of software and necessary general hardware platform, of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory / random access memory, a magnetic disk, an optical disk), and includes a plurality of instructions for causing a multimedia terminal device (which can be a mobile phone, a computer, a television receiver, or a network device) to execute the method described in each embodiment of the present application.

[0206] The above merely preferred embodiments of the present application and are not intended to limit the patent scope of the present application, any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for assembling frame-through pipe joints for aircraft systems, characterized in that, The method includes: Obtain several dimensions of the target through-frame pipe joint; Based on the surface contact pressure between the reinforcing boss of the structural frame and the target through-frame pipe joint, the axial preload model generated at the interference connection between the reinforcing boss of the structural frame and the target through-frame pipe joint is obtained. Based on the preset first safety factor, several dimensions of the target through-frame pipe joint, and the axial preload model, the minimum interference model between the reinforcing boss and the target through-frame pipe joint is obtained. Based on the radial stress, circumferential stress and equivalent maximum axial stress of the flange in the target through-frame pipe joint, the stress model of any point on the flange in the target through-frame pipe joint is obtained. Based on the preset second safety factor and the stress model, the maximum interference model between the reinforcing boss and the target through-frame pipe joint is obtained. The target through-frame pipe joint is assembled based on the minimum interference model and the maximum interference model. The model for obtaining the axial preload at the interference fit between the reinforcing boss of the structural frame and the target through-frame pipe joint, based on the surface contact pressure between the target through-frame pipe joint and the reinforcing boss of the structural frame, includes: Obtain the surface contact pressure model between the flange and the reinforcing boss in the target through-frame pipe joint; Based on the surface contact pressure model between the flange and the reinforcing boss in the target through-frame pipe joint, the axial preload model generated at the interference connection between the reinforcing boss and the target through-frame pipe joint is obtained. The process of obtaining the surface contact pressure model between the flange and the reinforcing boss in the target through-frame pipe joint includes: The surface contact pressure model is obtained through the following relationship: in, This represents a surface contact pressure model. This indicates the elastic modulus of the through-frame pipe joint or reinforcing boss. 1 indicates the first overshoot model. Indicates the inner diameter of the flange of the through-frame pipe fitting; The method for obtaining the axial preload model at the interference fit between the reinforcing boss and the target through-frame pipe joint based on the surface contact pressure model between the flange and the reinforcing boss in the target through-frame pipe joint includes: The axial preload model is obtained through the following relationship: in, F 1 indicates axial preload. This indicates the coefficient of friction between the flange and the reinforcing boss surface of the through-frame pipe fitting. This indicates the thickness of the reinforced boss.

2. The assembly method for through-frame pipe joints in aircraft systems as described in claim 1, characterized in that, The assembly of the target through-frame pipe joint based on the minimum interference model and the maximum interference model includes: Based on the minimum interference model and the maximum interference model, the tolerance model of the flange outer diameter in the target through-frame pipe joint is obtained; Based on the preset third safety factor and the outer diameter of the flange in the target through-frame pipe joint, the manual assembly interference between the reinforcing boss and the target through-frame pipe joint is obtained. Based on the assembly conditions between the reinforcing boss and the target through-frame pipe joint and the tolerance model of the flange outer diameter in the target through-frame pipe joint, the actual interference fit between the reinforcing boss and the target through-frame pipe joint is obtained. The manual assembly interference and the actual interference are compared to assemble the target through-frame pipe joint.

3. The assembly method for through-frame pipe joints in aircraft system piping as described in claim 2, characterized in that, The step of comparing the manual assembly interference with the actual interference to assemble the target through-frame pipe joint includes: When the actual interference is less than or equal to the manual assembly interference, the target through-frame pipe joint is manually assembled. When the actual interference fit is greater than or equal to the manual assembly interference fit, the target through-frame pipe joint is press-fitted.

4. The assembly method for through-frame pipe joints in aircraft system piping as described in claim 3, characterized in that, The method for obtaining the actual interference fit between the reinforcing boss and the target through-frame pipe joint based on the assembly conditions between the reinforcing boss and the target through-frame pipe joint and the tolerance model of the outer diameter of the flange in the target through-frame pipe joint includes: The actual interference amount is obtained using the following formula; in, This represents the actual interference fit parameter, and x represents the tolerance model of the flange outer diameter in the target through-frame pipe joint. This indicates the ambient temperature during the assembly of the target through-frame pipe joint. 'b' represents the cooling temperature during assembly of the target through-frame pipe fitting, and 'b' represents the outer diameter of the flange in the target through-frame pipe fitting. Indicates the coefficient of thermal expansion of the target through-frame pipe joint; The manual assembly interference between the reinforcing boss and the target through-frame pipe joint is obtained based on a preset third safety factor and the outer diameter of the flange in the target through-frame pipe joint, including: The manual assembly interference is obtained using the following formula: in, This indicates the interference fit parameter for manual assembly. This represents the third safety factor; The tolerance model for the flange outer diameter in the target through-frame pipe joint, based on the minimum interference model and the maximum interference model, includes: The tolerance model for the flange outer diameter in the target through-frame pipe joint is obtained using the following formula: in, This indicates the upper deviation of the outer diameter of the reinforced boss. This indicates the lower deviation of the outer diameter of the flange in the target through-frame pipe joint. This represents the minimum interference model.

5. The assembly method for through-frame pipe joints in aircraft systems as described in claim 1, characterized in that, The method for obtaining the minimum interference fit model between the reinforcing boss and the target through-frame pipe joint based on a preset first safety factor, several dimensions of the target through-frame pipe joint, and the axial preload model includes: The first interference model is obtained through the following relationship: in, This indicates the maximum allowable axial load for the through-frame pipe fitting. This represents the first safety factor; The minimum interference model is obtained through the following relationship: in, This represents the minimum overshoot model. This represents the minimum coefficient of friction between the flange and the reinforcing boss surface of the through-frame pipe joint.

6. The assembly method for through-frame pipe joints in aircraft system piping as described in claim 1, characterized in that, The process of obtaining a stress model at any point on the flange of the target through-frame pipe joint based on the radial stress, circumferential stress, and equivalent maximum axial stress of the flange includes: The stress model at any point on the flange of the target through-frame pipe joint can be obtained using the following relationship: in, This represents the stress model at any point on the flange of the target through-frame pipe joint. This represents the radial stress on the flange of the target through-frame pipe joint. This represents the circumferential stress on the flange of the target through-frame pipe joint. This represents the equivalent maximum axial stress generated during the flange assembly process in the target through-frame pipe joint; This represents the coordinates of any point inside the flange of the target through-frame pipe joint.

7. The assembly method for through-frame pipe joints in aircraft system piping as described in claim 6, characterized in that, The method for obtaining the maximum interference fit model between the reinforcing boss and the target through-frame pipe joint based on the preset second safety factor and the stress model includes: The second interference model is obtained through the following relationship: in, This represents the second interference model. This represents the second safety factor. Indicates the yield stress of the material; The maximum interference model is obtained through the following relationship: in, This represents the maximum overshoot model. This represents the minimum coefficient of friction between the flange and the reinforcing boss surface of the through-frame pipe joint.

8. An assembly device for through-frame pipe fittings in aircraft systems, used to implement the assembly method for through-frame pipe fittings in aircraft systems according to any one of claims 1-7, characterized in that, The device includes: The acquisition module is used to acquire several dimensions of the target through-frame pipe joint; The first obtaining module is used to obtain an axial preload model generated at the interference connection between the reinforcing boss of the structural frame and the target through-frame pipe joint based on the surface contact pressure between the target through-frame pipe joint and the reinforcing boss of the structural frame. The second obtaining module is used to obtain the minimum interference model between the reinforcing boss and the target through-frame pipe joint based on a preset first safety factor, several dimensions of the target through-frame pipe joint, and the axial preload model. The third acquisition module is used to obtain the stress model of any point on the flange of the target through-frame pipe joint based on the radial stress, circumferential stress and equivalent maximum axial stress of the flange. The fourth obtaining module is used to obtain the maximum interference model between the reinforcing boss and the target through-frame pipe joint based on the preset second safety factor and the stress model; An assembly module is used to assemble the target through-frame pipe joint based on the minimum interference model and the maximum interference model.

9. A computer device, characterized in that, The computer device includes a memory and a processor, wherein the memory stores a computer program and the processor executes the computer program to implement the method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, and the processor executes the computer program to implement the method as described in any one of claims 1-7.

Images