T-shaped sealing structure with spanwise variable stiffness connection and optimization method

Abstract

The invention belongs to the technical field of airplane wing strength design, and particularly relates to a spanwise variable stiffness connection T-shaped sealing structure and an optimization method, the spanwise variable stiffness connection T-shaped sealing structure comprises a sealing structure, a connection corner box and a support structure; the supporting structure comprises a plurality of supporting partition plates distributed in the spanwise direction and wall plates fixedly installed above the supporting partition plates, honeycomb sandwich cores are arranged at the positions, between the adjacent supporting partition plates, of the wall plates, and the rear edges of the wall plates are fixedly connected with a plurality of connecting corner boxes in the spanwise direction. The sealing structure comprises a sealing plate and a vertical rib, the sealing plate is divided into a front fixed section and a rear cantilever section, and the vertical rib is located between the fixed section and the cantilever section; the fixing section is fixedly connected with the upper surface of the connecting angle box and the supporting partition plate, the vertical rib is fixedly connected with the vertical face of the rear end of the connecting angle box, the T-shaped sealing structure and the wall plate form an integral structure, the relative deformation is reduced, the strain level of the sealing structure is effectively reduced, and the service life of the sealing structure is prolonged.

Description

Technical Field

[0001] The present application belongs to the technical field of aircraft wing strength design, and in particular relates to a T-shaped sealing structure with spanwise variable stiffness connection and an optimization method. Background Art

[0002] In order to meet the requirements of aerodynamic sealing and other aspects of the aircraft, many aircraft will set up sealing structures between the rudder and the fixed structure. The sealing structure is mostly a cantilever beam flat plate structure. The fixed end of the sealing structure is connected to the supporting structure through a belt plate, and the free end is overlapped on the rudder, close to the rudder and deflects with it. This type of sealing structure will cause the connecting belt plate to bend repeatedly during repeated large deformations, which is prone to fatigue cracks; at the same time, the connecting bolts are subjected to the load brought by the bending moment, with large pull-out force and large extrusion load on the hole edge, and the bolts and nail holes are easily damaged. Summary of the invention

[0003] In order to solve the above problems, the present application provides 1. a T-shaped sealing structure with spanwise variable stiffness connection, comprising:

[0004] Sealing structure, connecting corner boxes and supporting structures;

[0005] The supporting structure includes a plurality of supporting baffles distributed along the span direction, a wall panel fixedly installed above the supporting baffles, the wall panel having a honeycomb core at a position between adjacent supporting baffles, and a plurality of connecting corner boxes fixedly connected to the rear edge of the wall panel along the span direction;

[0006] The sealing structure includes a sealing plate and vertical ribs. The sealing plate is divided into a fixed section at the front section and a cantilever section at the rear section. The vertical ribs are located between the fixed section and the cantilever section. The fixed section is fixedly connected to the upper surface of the connecting corner box and the supporting partition, and the vertical ribs are fixedly connected to the rear end vertical surface of the connecting corner box.

[0007] Preferably, the wall panel has a wall panel honeycomb core between adjacent supporting partitions, and the connecting corner box is fixed to the wall panel honeycomb core.

[0008] Preferably, the sealing structure is made of composite material.

[0009] Preferably, the cantilever section of the sealing structure overlaps with the aircraft control surface and is a curved plate structure with variable thickness.

[0010] Preferably, the supporting partition is an L-shaped partition or a T-shaped partition.

[0011] Preferably, the supporting partition is connected to the wall panel by bolts.

[0012] Preferably, the corner box and the wall panel are connected by bolts.

[0013] Preferably, the wall panel has a first mounting surface at the location of the honeycomb core of the wall panel where the thickness is the largest, a second mounting surface near the edge where the thickness is the smallest, and a transition slope surface where the maximum thickness and the minimum thickness are connected; the connecting corner box has a mounting surface that fits the shape of the first mounting surface, the second mounting surface and the transition slope surface.

[0014] Preferably, the connecting corner box has bolts connected to the wall panel at both the first mounting surface and the second mounting surface.

[0015] Preferably, the sealing structure and the connecting corner box are connected by bolts.

[0016] A T-shaped sealing structure optimization method is used to optimize the T-shaped sealing structure with spanwise variable stiffness connection and establish a finite element analysis model of the T-shaped sealing structure and the rudder skin;

[0017] Create motion conditions for the finite element analysis model and apply aerodynamic loads to obtain the position where the contact force between the T-shaped sealing structure and the rudder skin is the largest;

[0018] Taking the contact force between the sealing structure and the rudder skin at the position with the largest contact force as a constraint that the contact force is not greater than a set value, and taking the minimum strain of the T-shaped sealing structure as a goal, the design parameters of the cantilever section of the T-shaped sealing structure are obtained;

[0019] The material and shape of the sealing structure are selected according to the design parameters.

[0020] Preferably, the cantilever section is divided into a plurality of partitions along the chord direction, the design parameters include the partition thickness of each partition, and based on the determined partition thickness, the ply ratio of the isotropic fabric and the unidirectional tape in each partition is determined with the minimum weight as the goal.

[0021] Advantages of this application include:

[0022] 1. The T-type sealing structure adds side bolts in the connection area. The torque from the cantilever end is transmitted through two paths, reducing the risk of nail hole damage and bolt head breakage in the sealing plate connection area;

[0023] 2. The T-shaped sealing structure and the wall panel form an integral structure, which reduces the relative deformation, effectively reduces the strain level of the sealing structure and enhances its service life;

[0024] 3. The connection corner boxes are evenly distributed along the span direction, which reduces the connection stiffness. The bending moment caused by the sealing structure is transmitted to the honeycomb core of the wall panel through the corner boxes, effectively reducing the weight of the supporting structure;

[0025] 4. The connecting corner boxes are evenly distributed along the span direction, and the span direction stiffness is variable, which improves the ability to resist wing deformation and torsion;

[0026] 5. A balance between high strength and large deformation of structural materials is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a cross-sectional view of a T-shaped sealing structure with spanwise variable stiffness connection according to a preferred embodiment of the present application;

[0028] Figure 2 It is a stereoscopic view from bottom to top of a T-shaped sealing structure with spanwise variable stiffness connection according to a preferred embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be further described in detail in detail and in detail in conjunction with the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0030] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installed", "connected", "connected" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0031] like Figure 1-Figure 2 As shown, in order to solve the above problems, the present application provides 1. a T-shaped sealing structure with spanwise variable stiffness connection, comprising:

[0032] Sealing structure, connecting corner box 3 and supporting structure;

[0033] The supporting structure comprises a plurality of supporting baffles 1 distributed along the span direction, a wall panel 2 fixedly installed above the supporting baffles 1, the wall panel 2 having a honeycomb core at a position between adjacent supporting baffles 1, and a plurality of connecting corner boxes 3 fixedly connected to the rear edge of the wall panel 2 along the span direction;

[0034] The sealing structure includes a sealing plate 4 and a vertical rib 41. The sealing plate 4 is divided into a fixed section at the front section and a cantilever section at the rear section. The vertical rib 41 is located between the fixed section and the cantilever area. The fixed section is fixedly connected to the upper surface of the connecting corner box 3 and the supporting partition 1, and the vertical rib 41 is fixedly connected to the rear end vertical surface of the connecting corner box 3. The supporting partition 1 is connected to the wall panel 2 by bolts, and the connecting corner box 3 is connected to the wall panel 2 by bolts. The wall panel 2 has a first mounting surface at the maximum thickness at the position of the honeycomb core of the wall panel, a second mounting surface near the minimum thickness at the edge, and a transition slope at the connection of the maximum thickness and the minimum thickness; the connecting corner box 3 has a mounting surface that fits the shape of the first mounting surface, the second mounting surface and the transition slope. The connecting corner box 3 is connected to the wall panel 2 by bolts at the positions of the first mounting surface and the second mounting surface. The sealing structure is connected to the connecting corner box 3 by bolts.

[0035] The bending moment of the sealing structure will be transmitted to the supporting structure through the double force transmission path of the outer surface bolts and several side bolts; this connection form converts part of the bolt tension into the shear force of the inner bolts, reducing the risk of nail hole damage and bolt head fracture in the sealing plate connection area. The free end is a curved plate with variable thickness, which can make it evenly stressed according to the cantilever beam theory, reducing the risk of damage.

[0036] The evenly distributed connection corner boxes in the span direction, on the one hand, make the spanwise stiffness of the connection area variable, thus improving the ability to resist wing deformation and torsion; on the other hand,

[0037] It also reduces the connection stiffness, allowing the bending moment caused by the sealing structure to be transferred to the honeycomb core of the wall panel through the corner box, effectively reducing the weight of the supporting structure.

[0038] This spanwise variable stiffness connection sealing structure enables the T-shaped sealing structure and the wall panel to form an integral structure. On the one hand, it reduces the relative deformation, effectively reduces the strain level of the sealing structure, and enhances its service life; on the other hand, it can be disassembled and installed together with the wall panel, reducing the difficulty of disassembly and assembly.

[0039] Preferably, the wall panel 2 has a wall panel honeycomb core between adjacent supporting partitions 1, and the connecting corner box 3 is fixed on the wall panel honeycomb core.

[0040] Preferably, the sealing structure is made of composite material.

[0041] Preferably, the cantilever section of the sealing structure overlaps with the aircraft control surface and is a curved plate structure with variable thickness.

[0042] Preferably, the supporting partition 1 is an L-shaped partition or a T-shaped partition.

[0043] A T-shaped sealing structure optimization method is used to optimize the T-shaped sealing structure with spanwise variable stiffness connection and establish a finite element analysis model of the T-shaped sealing structure and the rudder skin;

[0044] Create motion conditions for the finite element analysis model and apply aerodynamic loads to obtain the position where the contact force between the T-shaped sealing structure and the rudder skin is the largest;

[0045] Taking the contact force between the sealing structure and the rudder skin at the position with the largest contact force as a constraint that the contact force is not greater than a set value, and taking the minimum strain of the T-shaped sealing structure as a goal, the design parameters of the cantilever section of the T-shaped sealing structure are obtained;

[0046] The material and shape of the sealing structure are selected according to the design parameters.

[0047] Preferably, the cantilever section is divided into a plurality of partitions along the chord direction, the design parameters include the partition thickness of each partition, and based on the determined partition thickness, the ply ratio of the isotropic fabric and the unidirectional tape in each partition is determined with the minimum weight as the goal.

[0048] Advantages of this application include:

[0049] 1. The T-type sealing structure adds side bolts in the connection area. The torque from the cantilever end is transmitted through two paths, reducing the risk of nail hole damage and bolt head breakage in the sealing plate connection area;

[0050] 2. The T-shaped sealing structure and the wall panel form an integral structure, which reduces the relative deformation, effectively reduces the strain level of the sealing structure and enhances its service life;

[0051] 3. The connection corner boxes are evenly distributed along the span direction, which reduces the connection stiffness. The bending moment caused by the sealing structure is transmitted to the honeycomb core of the wall panel through the corner boxes, effectively reducing the weight of the supporting structure;

[0052] 4. The connecting corner boxes are evenly distributed along the span direction, and the span direction stiffness is variable, which improves the ability to resist wing deformation and torsion;

[0053] 5. A balance between high strength and large deformation of structural materials is achieved.

[0054] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A T-shaped sealing structure with spanwise variable stiffness connection, characterized in that: include: Sealing structure, connecting corner box (3) and supporting structure; The support structure comprises a plurality of support baffles (1) distributed along the span direction, a wall panel (2) fixedly mounted above the support baffles (1), the wall panel (2) having a honeycomb core at a position between adjacent support baffles (1), and a plurality of connection corner boxes (3) fixedly connected to the rear edge of the wall panel (2) along the span direction; The sealing structure comprises a sealing plate (4) and vertical ribs (41), wherein the sealing plate (4) is divided into a front fixed section and a rear cantilever section, and the vertical ribs (41) are located between the fixed section and the cantilever section; the fixed section is fixedly connected to the upper surface of the connecting corner box (3) and the supporting partition (1), and the vertical ribs (41) are fixedly connected to the rear end vertical surface of the connecting corner box (3).

2. The T-shaped sealing structure with spanwise variable stiffness connection according to claim 1, characterized in that: The wall panel (2) has a wall panel honeycomb core between adjacent supporting partitions (1), and the connecting corner box (3) is fixed on the wall panel honeycomb core.

3. The T-shaped sealing structure with spanwise variable stiffness connection according to claim 1, characterized in that: The sealing structure is made of composite material.

4. The T-shaped sealing structure with spanwise variable stiffness connection according to claim 3, characterized in that: The cantilever section of the sealing structure is overlapped with the aircraft rudder surface and is a curved plate structure with variable thickness.

5. The T-shaped sealing structure with spanwise variable stiffness connection according to claim 1, characterized in that: The supporting partition (1) is an L-shaped partition or a T-shaped partition.

6. The T-shaped sealing structure with spanwise variable stiffness connection according to claim 5, characterized in that: The supporting partition plate (1) is connected to the wall plate (2) via bolts.

7. The T-shaped sealing structure with spanwise variable stiffness connection according to claim 1, characterized in that: The corner box (3) and the wall plate (2) are connected by bolts.

8. The T-shaped sealing structure with spanwise variable stiffness connection according to claim 2, characterized in that: The wall panel (2) has a first mounting surface at the location of the honeycomb core of the wall panel where the thickness is the largest, a second mounting surface close to the edge where the thickness is the smallest, and a transition slope surface where the maximum thickness and the minimum thickness are connected; The connecting corner box (3) has a mounting surface that matches the shape of the first mounting surface, the second mounting surface and the transition slope surface.

9. The T-shaped sealing structure with spanwise variable stiffness connection according to claim 2, characterized in that: The connecting corner box (3) is provided with bolts at the first installation surface and the second installation surface for connection with the wall plate (2).

10. The T-shaped sealing structure with spanwise variable stiffness connection according to claim 9, characterized in that: The sealing structure and the connecting corner box (3) are connected by bolts.

11. A method for optimizing a T-shaped sealing structure, used for optimizing a T-shaped sealing structure with spanwise variable stiffness connection as claimed in any one of claims 1 to 10, characterized in that: Establish the finite element analysis model of the T-shaped sealing structure and the rudder skin; Create motion conditions for the finite element analysis model and apply aerodynamic loads to obtain the position where the contact force between the T-shaped sealing structure and the rudder skin is the largest; Taking the contact force between the sealing structure and the rudder skin at the position with the largest contact force as a constraint that the contact force is not greater than a set value, and taking the minimum strain of the T-shaped sealing structure as a goal, the design parameters of the cantilever section of the T-shaped sealing structure are obtained; The material and shape of the sealing structure are selected according to the design parameters.

12. The optimization design method for a large deformation flexible sealing structure according to claim 11, characterized in that: The cantilever section is divided into a plurality of partitions along the chord direction, the design parameters include the thickness of each partition, and based on the determined thickness of each partition, the ply ratio of the isodirectional fabric and the unidirectional tape of each partition is determined with the goal of minimizing weight.

Images