Tension-shear composite connection variable stiffness sealing structure and optimization method

Abstract

The invention belongs to the technical field of airplane wing strength design, and particularly relates to a tension-shear composite connection variable stiffness sealing structure and an optimization method, the tension-shear composite connection variable stiffness sealing structure comprises a sealing structure, a groove-shaped band plate (3) and a supporting structure; the supporting structure comprises a plurality of supporting partition plates (1) distributed in the spanwise direction, a groove-shaped band plate (3) is connected with the tail ends of the supporting partition plates (1) in the spanwise direction, the groove-shaped band plate (3) and the supporting partition plates (1) form a frame type structure, the groove-shaped band plate (3) comprises a bottom plate and a vertical plate, and the bottom plate is connected with the supporting partition plates (1); the vertical plate is perpendicular to the bottom plate; the sealing structure comprises a sealing plate (4) and a vertical rib (41), the sealing plate (4) is divided into a front fixed section and a rear cantilever section, and the vertical rib (41) is located between the fixed section and the cantilever section; the fixed section is fixedly connected with a bottom plate of the groove-shaped band plate (3), the vertical rib (41) is fixedly connected with a vertical plate of the groove-shaped band plate (3), and the cantilever section of the sealing structure is in lap joint with the control plane (2).

Description

Technical Field

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

[0002] The sealing structure of aircraft with sealing requirements is mostly a cantilever beam flat plate structure, and the sealing structure is connected to the supporting structure through a belt plate. This 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 bear the load brought by the bending moment, the pull-out force is large, the hole edge extrusion load is large, and the bolts and nail holes are easily damaged. In addition, the cantilever beam flat plate structure has a small rigidity at the fixed end, and often has more deformation capacity than load-bearing capacity, resulting in a weak sealing function. Summary of the invention

[0003] In order to solve the above problems, the present application provides a variable stiffness sealing structure of a tension-shear composite connection, comprising:

[0004] Sealing structure, grooved strip plate (3) and supporting structure;

[0005] The supporting structure comprises a plurality of supporting baffles (1) distributed along the span direction, a grooved strip plate (3) connecting the ends of the plurality of supporting baffles (1) along the span direction, and forming a frame structure with the supporting baffles (1), the grooved strip plate (3) comprising a bottom plate and a vertical plate, the bottom plate being connected to the supporting baffles (1); the vertical plate being perpendicular to the bottom plate;

[0006] 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 bottom plate of the grooved strip plate (3), the vertical ribs (41) are fixedly connected to the vertical plate of the grooved strip plate (3), and the cantilever section of the sealing structure overlaps the rudder surface (2).

[0007] In some optional embodiments, it also includes a wall panel, which is installed on the frame structure formed by the supporting partition plate (1) and the grooved belt plate (3).

[0008] In some optional embodiments, the sealing structure is made of composite materials.

[0009] In some optional embodiments, the sealing structure is a curved plate structure with variable thickness.

[0010] In some optional embodiments, the supporting partition (1) is an L-shaped partition or a T-shaped partition.

[0011] In some optional embodiments, the supporting partition (1) is connected to the wall panel by bolts.

[0012] In some optional embodiments, the sealing structure and the grooved strip plate (3) are connected by bolts, wherein the sealing structure and the grooved butt strip plate are connected by two rows of bolts, and the side bolts are the main force transmission path, which converts most of the out-of-plane tension into in-plane shear force, greatly reducing the risk of fracture of the sealing plate connection area and the bolt head. The free end is in the form of a curved plate with variable thickness, which is overlapped on the front edge of the rudder surface. According to the cantilever beam theory, it can be evenly stressed and reduce the risk of damage.

[0013] The supporting partition is a fixed structure, and the sealing structure is connected to it through a grooved butt plate. The grooved butt plate has a large cross-sectional inertia moment, which effectively enhances the bending resistance of the structure.

[0014] In some optional implementations, the thickness of the cantilever section of the sealing structure gradually decreases along the chord direction, and the specific method for obtaining the size parameters thereof includes:

[0015] Establish the finite element analysis model of the cantilever section and the rudder skin;

[0016] Create motion conditions for the finite element analysis model and apply aerodynamic loads to obtain the position where the contact force between the cantilever section and the rudder skin is the largest;

[0017] Taking the contact force between the cantilever section and the rudder surface skin at the position where the contact force is the largest as a constraint that the contact force is not greater than a set value and taking the minimum strain of the cantilever section as a goal, the design parameters of the cantilever section are obtained;

[0018] The material and shape of the sealing structure are selected according to the design parameters.

[0019] Preferably, the cantilever section is divided into a plurality of zones along the chord direction, the design parameters include the zone thickness of each zone, and based on the determined zone thickness and with the minimum weight as the goal, the ply ratio of the isodirectional fabric and the unidirectional tape of each zone is determined.

[0020] The advantages of this application include: the sealing structure has two rows of bolts in the connection area, and the side bolts are the main force transmission path, which converts most of the out-of-plane tension into in-plane shear force, greatly reducing the risk of bolt head breakage in the sealing plate connection area; the sealing structure has a large connection stiffness at the fixed end, which enhances the sealing structure's ability to resist deformation and effectively improves its bearing capacity; the grooved butt plate has a large cross-sectional inertia moment, which effectively enhances the structure's bending resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a cross-sectional view of a variable stiffness sealing structure of a tension-shear composite connection according to a preferred embodiment of the present application;

[0022] Figure 2 It is a three-dimensional diagram of a variable stiffness sealing structure of a tension-shear composite connection in a preferred embodiment of the present application. DETAILED DESCRIPTION

[0023] 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 with reference to 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.

[0024] 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.

[0025] like Figure 1-Figure 2 As shown, in order to solve the above problems, the present application provides a variable stiffness sealing structure of a tension-shear composite connection, comprising:

[0026] Sealing structure, grooved strip plate (3) and supporting structure;

[0027] The supporting structure comprises a plurality of supporting baffles (1) distributed along the span direction, a grooved strip plate (3) connecting the ends of the plurality of supporting baffles (1) along the span direction, and forming a frame structure with the supporting baffles (1), the grooved strip plate (3) comprising a bottom plate and a vertical plate, the bottom plate being connected to the supporting baffles (1); the vertical plate being perpendicular to the bottom plate;

[0028] 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 bottom plate of the grooved strip plate (3), the vertical ribs (41) are fixedly connected to the vertical plate of the grooved strip plate (3), and the cantilever section of the sealing structure overlaps the rudder surface (2).

[0029] Preferably, it also includes a wall panel, which is installed on the frame structure formed by the supporting partition plate (1) and the grooved belt plate (3).

[0030] Preferably, the sealing structure is made of composite material.

[0031] Preferably, the sealing structure is a curved plate structure with variable thickness.

[0032] Preferably, the supporting partition (1) is an L-shaped partition or a T-shaped partition.

[0033] Preferably, the supporting partition (1) is connected to the wall panel by bolts.

[0034] Preferably, the sealing structure and the grooved belt plate (3) are connected by bolts.

[0035] Preferably, the thickness of the cantilever section of the sealing structure gradually decreases along the chord direction, and the specific method for obtaining the size parameters thereof includes:

[0036] Establish finite element analysis model of cantilever section and rudder skin;

[0037] Create motion conditions for the finite element analysis model and apply aerodynamic loads to obtain the position where the contact force between the cantilever section and the rudder skin is the largest;

[0038] Taking the contact force between the cantilever section and the rudder surface skin at the position where the contact force is the largest as a constraint that the contact force is not greater than a set value and taking the minimum strain of the cantilever section as a goal, the design parameters of the cantilever section are obtained;

[0039] The material and shape of the sealing structure are selected according to the design parameters.

[0040] Preferably, the cantilever section is divided into a plurality of zones along the chord direction, the design parameters include the zone thickness of each zone, and based on the determined zone thickness and with the minimum weight as the goal, the ply ratio of the isodirectional fabric and the unidirectional tape of each zone is determined.

[0041] The advantages of this application include: the sealing structure has two rows of bolts in the connection area, and the side bolts are the main force transmission path, which converts most of the out-of-plane tension into in-plane shear force, greatly reducing the risk of bolt head breakage in the sealing plate connection area; the sealing structure has a large connection stiffness at the fixed end, which enhances the sealing structure's ability to resist deformation and effectively improves its bearing capacity; the grooved butt plate has a large cross-sectional inertia moment, which effectively enhances the structure's bending resistance.

[0042] 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 variable stiffness sealing structure with tension-shear composite connection, characterized in that: include: Sealing structure, grooved strip plate (3) and supporting structure; The supporting structure comprises a plurality of supporting baffles (1) distributed along the span direction, a grooved strip plate (3) connecting the ends of the plurality of supporting baffles (1) along the span direction, and forming a frame structure with the supporting baffles (1), the grooved strip plate (3) comprising a bottom plate and a vertical plate, the bottom plate being connected to the supporting baffles (1); the vertical plate being perpendicular to the bottom plate; 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 bottom plate of the grooved strip plate (3), the vertical ribs (41) are fixedly connected to the vertical plate of the grooved strip plate (3), and the cantilever section of the sealing structure overlaps the rudder surface (2).

2. The variable stiffness sealing structure of the tension-shear composite connection according to claim 1, characterized in that: It also includes a wall panel, which is installed on a frame structure formed by the supporting partition plate (1) and the grooved belt plate (3).

3. The variable stiffness sealing structure of the tension-shear composite connection according to claim 1, characterized in that: The sealing structure is made of composite material.

4. The variable stiffness sealing structure of the tension-shear composite connection according to claim 3 is characterized in that: The sealing structure is a curved plate structure with variable thickness.

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

6. The variable stiffness sealing structure of the tension-shear composite connection according to claim 2, characterized in that: The supporting partition (1) is connected to the wall panel via bolts.

7. The variable stiffness sealing structure of the tension-shear composite connection according to claim 1, characterized in that: The sealing structure and the grooved belt plate (3) are connected by bolts.

8. The variable stiffness sealing structure of the tension-shear composite connection according to claim 1, characterized in that: The thickness of the cantilever section of the sealing structure gradually decreases along the chord direction, and the specific method for obtaining its size parameters includes: Establish finite element analysis model of cantilever section and 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 cantilever section and the rudder skin is the largest; Taking the contact force between the cantilever section and the rudder surface skin at the position where the contact force is the largest as a constraint that the contact force is not greater than a set value and taking the minimum strain of the cantilever section as a goal, the design parameters of the cantilever section are obtained; The material and shape of the sealing structure are selected according to the design parameters.

9. The optimization design method for a large deformation flexible sealing structure according to claim 8, 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.

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