A convex position connection structure for a wing-in-ground-effect vehicle's hull shape

Abstract

The invention relates to a convex position connection structure for the hull shape of a wing-in-ground-effect craft, comprising a hull, which is formed by laying a sandwich layer plate on the outside of a frame body, wherein the sandwich layer plate is a three-layer structure consisting of an inner layer, a sandwich layer and an outer layer; the frame body comprises a plurality of transverse frames arranged at intervals along the length direction of the hull, and the plurality of transverse frames are jointly installed with longitudinal trusses at intervals along the circumferential direction; the hull is installed with a mid-wing via a convex wide-direction connecting platform on the top surface or via a narrow-direction connecting platform extending laterally to both sides; stepped plates are laid along the width direction on the outer wall surfaces of the sandwich layer plates at the middle and rear parts of the bottom surface of the hull, forming a front stepped surface in the middle part of the bottom surface of the hull and a rear stepped surface in the middle part of the bottom surface of the hull; bilge plates are also laid along the length direction on the sandwich layer plates on both sides of the bottom of the hull to form a bilge body; thereby, the assembly of functional components is achieved while maintaining the continuity of the hull shape, and the overall structural strength and rigidity are greatly guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of wing-in-ground-effect craft, in particular to a convex-changing position connection structure of a hull shape of a wing-in-ground-effect craft. Background Art

[0002] A wing-in-ground-effect vehicle is an aircraft that can fly close to the water surface for a long time. Its structure is basically the same as that of a seaplane, consisting of a gliding hull, various wings, and floats.

[0003] With the significant improvement in the performance of advanced composite structures and the significant reduction in manufacturing costs, ground effect vehicles have also begun to widely use composite structures. The biggest difference between composite structures and metal structures in design and manufacturing lies in the different connection methods and stress forms. For example, the components of composite structures generally use large-area multi-point connections to achieve uniform stress on the structure, while metal structures only need to use a few metal joints to concentrate the stress to meet the use requirements. In addition, although composite structures are easy to manufacture at the convex changes in the structure, it is very difficult to maintain the continuity of the structure and the reasonable stress state. Metal materials can use a variety of metal connectors to solve these problems.

[0004] Therefore, in the process of promoting the application of composite materials structures in ground effect vehicles, especially when applying composite materials to the hull shape of ground effect vehicles, it is necessary to consider the structural assembly relationship between the composite materials and external components such as wings, and to meet the structural continuity and overall structural strength of the hull shape. Summary of the Invention

[0005] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides a rationally structured ground effect wing vehicle hull shape convex change position connection structure, thereby achieving the assembly of functional components while maintaining the continuity of the hull shape and greatly ensuring the overall structural strength and rigidity.

[0006] The technical solutions adopted in the present invention are as follows:

[0007] A convex position connection structure for a wing-in-ground-effect vehicle hull shape includes a hull, wherein the hull is formed by laying a sandwich layer on the outside of a frame body, the sandwich layer being a three-layer structure consisting of an inner layer, a sandwich layer, and an outer layer; the frame body includes a plurality of transverse frames arranged at intervals along the length direction of the hull, and the plurality of transverse frames are jointly provided with longitudinal girders at intervals along the circumference;

[0008] A mid-wing extending toward both sides is installed in the middle of the hull in the longitudinal direction;

[0009] When the middle wing is installed on the top surface of the hull, the sandwich panels at the top surface of the hull are penetrated inside and outside to form an opening, and a wide connection platform is extended upward from the edge of the opening, and the bottom surface of the middle wing is plugged into and matched with the wide connection platform; or when the middle wing is installed on the side of the hull, the sandwich panels at both sides of the hull are penetrated inside and outside to form an opening, and a narrow connection platform is extended laterally from the edge of the opening, and the end of the middle wing is plugged into and matched with the narrow connection platform;

[0010] The outer wall surfaces of the sandwich panels at the middle and rear parts of the hull bottom are respectively provided with stepped panels along the width direction, forming a front stepped surface at the middle part of the hull bottom and a rear stepped surface at the rear part of the hull bottom;

[0011] Bilge plates are also laid along the length direction on the sandwich panels on both sides of the hull bottom to form a bilge body.

[0012] As a further improvement of the above technical solution:

[0013] The length directions of the wide connecting platform and the narrow connecting platform are both arranged along the length direction of the hull, and the dimension of the wide connecting platform in the width direction is greater than the dimension of the narrow connecting platform in the width direction.

[0014] The structure of the wide connecting platform is as follows: it includes a wide outer frame formed by extending upward from the opening edge of the sandwich panel, the wide outer frame is an inner and outer double-layer structure that fits each other, the inner and outer double layers of the wide outer frame are respectively connected with the inner layer and outer layer of the sandwich panel, and the outer end of the wide outer frame is turned inward and extended to form a flange; the transverse frame and the outer wall surface of the longitudinal truss at the opening of the sandwich panel are jointly installed with a base plate, the top surface of the base plate is installed with a transverse support plate along the direction of the transverse frame, and the top surface of the base plate is installed with a longitudinal support plate along the direction of the longitudinal truss; the two ends of the longitudinal support plate and the transverse support plate are respectively tightly attached to the inner wall surface of the wide outer frame.

[0015] The structure of the narrow connecting platform is as follows: it includes a narrow outer frame formed by extending upward from the opening edge of the sandwich panel, the narrow outer frame is an inner and outer double-layer structure that fits each other, the inner and outer double layers of the narrow outer frame are respectively connected with the inner layer and outer layer of the sandwich panel, and the outer end of the narrow outer frame is turned inward and extended to form a second flange; the outer wall surface of the transverse frame at the opening of the sandwich panel is installed with a base narrow plate, and the top surface of the base narrow plate is installed with a wing thickness support plate along the direction of the transverse frame, and the two ends of the wing thickness support plate are respectively tightly attached to the inner wall surface of the narrow outer frame.

[0016] The structure of the bilge plate is as follows: it includes a side plate extending conformally downward along the side of the hull, a concave bottom plate is installed between the bottom end of the side plate and the bottom surface of the hull, one side edge of the concave bottom plate is connected with the side plate to form an acute angle, and the other side edge of the concave bottom plate is conformally fitted along the bottom surface of the hull; the closed space formed by the side plate, the concave bottom plate and the bottom surface of the hull is filled with a sandwich structure.

[0017] The structure of the stepped plate is as follows: it includes a horizontally arranged bottom plate, the distance between the top surface of the front of the bottom plate and the bottom surface of the hull gradually decreases until they fit conformally with each other, a vertically arranged rear plate is installed between the rear of the bottom plate and the bottom surface of the hull to form a stepped surface; side plates are installed between the two side edges of the bottom plate and the bottom end of the hull side, and the side plates are conformal to the hull side; the closed space formed by the bottom plate, the side plates on both sides, the rear plate and the bottom surface of the hull is filled with sandwich structure 2.

[0018] The bottom plate is in a V-shaped structure with the opening facing upward.

[0019] An extension plate is provided at the top end of the rear plate, which is in contact with the bottom surface of the hull and extends backwards, and the extension plate is conformal to the bottom of the hull.

[0020] The stepped plate at the front stepped surface extends forward and conforms to the bottom surface of the hull to form a front sliding surface; the stepped plate at the rear stepped surface extends forward and conforms to the bottom surface of the hull to form a rear sliding surface.

[0021] It also includes a tail fin installed on the top surface of the rear part of the hull. The sandwich layer panels at the rear position of the top surface of the hull are penetrated inside and outside to form an opening, and another narrow connecting platform is extended upward at the edge of the opening. The downward end of the tail fin is plugged into the narrow connecting platform.

[0022] The beneficial effects of the present invention are as follows:

[0023] The present invention has a compact and reasonable structure and is easy to operate. The mid-wing is installed through a wide-direction connecting platform or a narrow-direction connecting platform, a stepped surface is formed on the bottom surface of the hull by laying stepped plates, and bilge plates are laid on both sides of the bottom of the hull to form a bilge body, thereby realizing the layout, assembly and addition of various functional components on the hull, effectively ensuring the continuity of the hull shape, and greatly ensuring the overall structural strength and rigidity.

[0024] The present invention also includes the following advantages:

[0025] The outer frame structure of the wide and narrow connecting platforms equipped with the mid-wing or tail wing is composed of convex changes of sandwich panels laid on the hull shape, which effectively ensures the continuity of the hull shape and forms a closed and connected load-bearing body, improving the overall strength and rigidity. At the same time, on the basis of the convex changes forming the outer frame structure, corresponding bracing plates are set to further ensure the strength of the structure itself and the connection;

[0026] The outer frame structure of the wide and narrow connecting platforms is extended from the sandwich panels laid on the hull exterior. While ensuring continuity, the outer frame structure is a double-layer plate structure without an inner core, which facilitates the fitting of the connecting platform with external components and can further strengthen the structural connection through fasteners without causing damage to the composite material structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front view of the hull of the present invention.

[0028] Figure 2 It is a top view of the hull of the present invention.

[0029] Figure 3 This is a schematic diagram of the structure of the hull top surface being equipped with a mid-wing via a widthwise connecting platform according to the present invention.

[0030] Figure 4 It is a top view of the wide-direction connecting platform on the top surface of the hull of the present invention.

[0031] Figure 5 for Figure 4 Cross-sectional view along AA.

[0032] Figure 6 for Figure 5 A partial enlarged view of point B in the middle.

[0033] Figure 7 The width of the hull top surface of the present invention is connected along the platform Figure 5 Cross-sectional view in CC direction.

[0034] Figure 8 It is a structural schematic diagram of the narrow connecting platform on the hull of the present invention.

[0035] Figure 9 It is the front view of the narrow connecting platform of the present invention.

[0036] Figure 10 for Figure 9 Cross-sectional view along DD direction.

[0037] Figure 11 for Figure 9 Cross-sectional view along the EE direction.

[0038] Figure 12 for Figure 11 A partial enlarged view of point F in the middle.

[0039] Figure 13 for Figure 11 A partial enlarged view of point G in the middle.

[0040] Figure 14 It is a structural schematic diagram of the bilge body on the hull of the present invention.

[0041] Figure 15 This is a schematic diagram of the installation of the stepped plate on the bottom surface of the hull of the present invention.

[0042] Figure 16 This is a schematic diagram of the installation of the stepped plate on the bottom surface of the hull of the present invention in another direction.

[0043] Including: 1. Hull; 2. Narrow connecting platform; 3. Wide connecting platform; 4. Mid-wing; 5. Tail wing; 10. Sandwich layer;

[0044] 11. Front sliding surface; 12. Bilge body; 13. Front step surface; 14. Rear sliding surface; 15. Rear step surface; 16. Transverse frame; 17. Longitudinal truss plate;

[0045] 121. Sandwich structure 1; 122. Side panel; 123. Concave bottom panel;

[0046] 131. Bottom plate; 132. Side plate; 133. Sandwich structure 2; 134. Back plate; 135. Extension plate;

[0047] 21, narrow outer frame; 22, wing thick support plate; 23, base narrow plate; 211, flange 2;

[0048] 31. Wide outer frame; 32. Longitudinal support plate; 33. Horizontal support plate; 34. Base plate; 311. Flanged edge 1. DETAILED DESCRIPTION

[0049] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0050] like Figure 1-Figure 5 As shown, a convex position connection structure of a wing-in-ground-effect craft hull shape of this embodiment includes a hull 1, which is composed of a sandwich layer 10 laid on the outside of a frame body. The sandwich layer 10 is a three-layer structure consisting of an inner layer, a sandwich layer and an outer layer. The frame body includes a plurality of transverse frames 16 arranged at intervals along the length direction of the hull 1. The plurality of transverse frames 16 are commonly installed with longitudinal girders 17 at intervals along the circumferential direction.

[0051] A mid-wing 4 extending toward both sides is installed in the middle of the length direction of the hull 1;

[0052] like Figure 3 As shown, when the middle wing 4 is installed on the top surface of the hull 1, the sandwich layer 10 at the top surface of the hull 1 is penetrated inside and outside to form an opening, and the edge of the opening extends upward to form a wide connection platform 3, and the bottom surface of the middle wing 4 is plugged into the wide connection platform 3; or, as shown Figure 8 As shown, when the middle wing 4 is installed on the side of the hull 1, the sandwich panels 10 on both sides of the hull 1 penetrate inside and outside to form openings, and narrow connecting platforms 2 are extended laterally at the edges of the openings. The ends of the middle wing 4 are plugged into and matched with the narrow connecting platforms 2.

[0053] Stepped plates are laid along the width direction on the outer wall surfaces of the sandwich panels 10 at the middle and rear parts of the bottom surface of the hull 1, forming a front stepped surface 13 at the middle part of the bottom surface of the hull 1 and a rear stepped surface 15 at the rear part of the bottom surface of the hull 1;

[0054] The step is a structural form used to improve the gliding efficiency of ground effect vehicles and reduce resistance. It includes a front step surface 13 and a rear step surface 15. The front step surface constitutes a bulge of the front gliding surface 11 relative to the rear gliding surface 14, while the rear step surface 15 constitutes a bulge of the rear gliding surface 14 relative to the stern body.

[0055] Bilge plates are also laid along the length direction on the sandwich panels 10 on both sides of the bottom of the hull 1 to form bilge bodies 12; the bilge bodies 12 are protruding wave-suppression structures on the hull of the ground effect vehicle, which are used to curb water splashing when the ground effect vehicle glides at high speed. The continuity, reliability and conformality of the connection between the bilge bodies 12 and the hull 1 are crucial to gliding.

[0056] In this embodiment, the mid-wing 4 is installed through the wide connecting platform 3 or the narrow connecting platform 2, a stepped surface is formed on the bottom surface of the hull 1 by laying stepped plates, and bilge plates are laid on both sides of the bottom of the hull 1 to form the bilge body 12, thereby realizing the layout, assembly and addition of various functional components on the hull 1 and effectively ensuring the continuity of the outer shape of the hull 1.

[0057] The length directions of the wide connecting platform 3 and the narrow connecting platform 2 are both arranged along the length direction of the hull 1 , and the width dimension of the wide connecting platform 3 is greater than the width dimension of the narrow connecting platform 2 .

[0058] When the middle wing 4 is installed via the narrow connection platform 2, a groove is provided at the end of the cross section of the middle wing 4 to achieve the connection of the concave and convex structures of the middle wing 4 in the radial direction; when the middle wing 4 is installed via the wide connection platform 3, a groove is provided in the thickness direction perpendicular to the wing surface of the middle wing 4 to achieve the connection of the concave and convex structures in the vertical direction.

[0059] Of course, in actual design and use, the protruding height of the narrow connecting platform 2 can be appropriately greater than the protruding height of the wide connecting platform 3 according to actual needs.

[0060] like Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, the structure of the wide connecting platform 3 is as follows: it includes a wide outer frame 31 formed by extending upward from the opening edge of the sandwich layer 10, the wide outer frame 31 is an inner and outer double-layer structure that fits each other, the inner and outer double layers of the wide outer frame 31 are respectively connected with the inner layer and outer layer of the sandwich layer 10, and the outer end of the wide outer frame 31 is turned inward and extended to form a flange 311; the outer wall surfaces of the transverse frame 16 and the longitudinal truss 17 at the opening of the sandwich layer 10 are jointly installed with a base plate 34, and the top surface of the base plate 34 is installed with a transverse support plate 33 along the direction of the transverse frame 16, and the top surface of the base plate 34 is installed with a longitudinal support plate 32 along the direction of the longitudinal truss 17; the ends of the longitudinal support plate 32 and the transverse support plate 33 are respectively tightly attached to the inner wall surface of the wide outer frame 31.

[0061] On the middle wing 4, which is usually inserted into the width connection platform 3, the groove is usually opened in the middle of the wing, and the groove is approximately square. The length and width of the groove are limited by the wing surface area and the width of the hull 1, and the depth of the groove is limited by the wing thickness.

[0062] like Figure 9 、 Figure 10 、 Figure 11 and Figure 12 As shown, the structure of the narrow connecting platform 2 is: it includes a narrow outer frame 21 formed by extending upward from the opening edge of the sandwich layer 10, the narrow outer frame 21 is an inner and outer double-layer structure that fits each other, the inner and outer double layers of the narrow outer frame 21 are respectively connected with the inner layer and outer layer of the sandwich layer 10, and the outer end of the narrow outer frame 21 is turned inward and extended to form a flange 211; the outer wall surface of the transverse frame 16 at the opening of the sandwich layer 10 is installed with a base narrow plate 23, and the top surface of the base narrow plate 23 is installed with a wing thickness support plate 22 along the direction of the transverse frame 16, and the two ends of the wing thickness support plate 22 are respectively tightly attached to the inner wall surface of the narrow outer frame 21.

[0063] In this embodiment, the outer frame structures of the wide connecting platform 3 and the narrow connecting platform 2 equipped with the center wing 4 or the tail wing 5 are both composed of convex changes of the sandwich layer 10 laid on the outer shape of the hull 1, which effectively ensures the continuity of the outer shape of the hull 1, and forms closed and connected load-bearing bodies with each other. It can also effectively transfer external forces to the structure of the hull 1, thereby improving the overall strength and rigidity. At the same time, on the basis of the convex changes to form the outer frame structure, corresponding support plates are provided to further ensure the strength of the structure itself and the connection.

[0064] The outer frame structure of the wide connecting platform 3 and the narrow connecting platform 2 is extended from the sandwich layer 10 laid on the outer surface of the hull 1. While ensuring continuity, the outer frame structure is a double-layer plate structure without an inner core, which facilitates the fitting and matching of the connecting platform with external components and can further strengthen the structural connection through fasteners without causing damage to the composite material structure.

[0065] The arrangement of the first flange 311 and the second flange 211 in the wide connecting platform 3 and the narrow connecting platform 2 can effectively enhance the structural rigidity of the connecting platform itself on the insertion cross section and ensure assembly reliability.

[0066] The arrangement of the various support plates in the wide connecting platform 3 and the narrow connecting platform 2, such as the longitudinal support plates 32 and the transverse support plates 33 in the wide connecting platform 3, and the wing thickness support plates 22 in the narrow connecting platform 2, effectively reduces the spacing distance in the length direction or width direction of the connecting platform and ensures the structural integrity of the connecting platform, thereby greatly improving the structural strength and rigidity of the connection.

[0067] During actual production, the sandwich panels 10 laid on the outer shape of the hull 1 can be directly extended to form the outer frame structure of the connecting platform after removing the middle core, and the inner and outer panels can be directly bonded and fixed together.

[0068] On the basis of the forming of the narrow outer frame 21, the basic narrow plate 23 is first pasted on the transverse frame 16 at the opening of the hull 1, and then the wing thickness support plate 22 is pasted on the basic narrow plate 23, thereby decomposing the narrow outer frame 21 into several interconnected closed load-bearing bodies with smaller cross-sections, effectively ensuring the continuity of the structure, and having good load-bearing capacity and effective external force transmission ability.

[0069] like Figure 13 and Figure 14 As shown, the structure of the bilge plate is as follows: it includes a side plate 122 that extends conformally downward along the side of the hull 1, and a concave bottom plate 123 is installed between the bottom end of the side plate 122 and the bottom surface of the hull 1. The edge of one side of the concave bottom plate 123 is connected with the side plate 122 to form an acute angle, and the edge of the other side of the concave bottom plate 123 is conformally fitted along the bottom surface of the hull 1; the closed space formed by the side plate 122, the concave bottom plate 123 and the bottom surface of the hull 1 is filled with a sandwich structure 121.

[0070] The top end of the side panel 122 can be bonded and fixed to the lower part of the side of the hull 1, and the bottom end of the side panel 122 can be bonded and fixed to the end of the concave bottom plate 123. The end of the concave bottom plate 123 conforms to the bottom surface of the hull 1 and is bonded to each other; the filled sandwich structure 121 can also be bonded and fixed to the corresponding object surface on each outer side during molding.

[0071] In this embodiment, the side panels 122 and the concave bottom panel 123 can be made of glass fiber or carbon fiber laminates; the sandwich structure 121 can be made of structural foam.

[0072] Since the bilge body 12 is a protrusion with little correlation with the structural strength and stiffness of the hull 1 itself, the core of the bilge body 12 is to maintain the continuity of its own structural form while being fixed to the hull 1 and maintaining conformity.

[0073] In actual production, the sandwich structure 121 can be formed and then bonded to the hull 1, and then the side panels 122 and the concave bottom panel 123 are sequentially layered and continuously pasted to maintain the overall smooth line of the hull 1.

[0074] The broken steps are a measure used to improve the gliding efficiency of the hull and reduce resistance. Here, the bottom gliding surface appears discontinuous step shape, that is, a discontinuous convex structure.

[0075] like Figure 15 and Figure 16As shown, the structure of the stepped plate is as follows: it includes a horizontally arranged bottom plate 131, the distance between the front top surface of the bottom plate 131 and the bottom surface of the hull 1 gradually decreases until they fit conformally with each other, and a vertically arranged rear plate 134 is installed between the rear part of the bottom plate 131 and the bottom surface of the hull 1 to form a stepped surface; side plates 132 are installed between the two side edges of the bottom plate 131 and the bottom end of the side surface of the hull 1, and the side plates 132 are conformal to the side surface of the hull 1; the closed space formed by the bottom plate 131, the side plates 132 on both sides, the rear plate 134 and the bottom surface of the hull 1 is filled with a sandwich structure 133.

[0076] During actual manufacturing, the sandwich structure 133 can be pre-manufactured according to the shape of the stepped plate, and its material can be structural foam.

[0077] The bottom plate 131 is in a V-shaped structure with an opening facing upward.

[0078] An extension plate 135 extends rearward from the top end of the rear plate 134 in contact with the bottom surface of the hull 1 , and the extension plate 135 conforms to the shape of the bottom of the hull.

[0079] In this embodiment, the bottom plate 131, the rear plate 134, the side plate 132 and the extension plate 135 can all be made of glass fiber or carbon fiber plies, and the plies and the outer wall surface of the sandwich ply 10 of the hull 1 can be adhered and fixed to each other by bonding.

[0080] The stepped plate at the front step surface 13 extends forward and conforms to the bottom surface of the hull 1 to form a front sliding surface 11; the stepped plate at the rear step surface 15 extends forward and conforms to the bottom surface of the hull 1 to form a rear sliding surface 14.

[0081] Steps are highly stressed structures within hull 1, improving hull 1's planing efficiency and reducing drag during high-speed navigation. The core of step continuity design is to maintain the structural continuity of hull 1's framework, including longitudinal members such as the longitudinal girders and main keel structure, through changes in structural configuration.

[0082] In this embodiment, the provision of stepped plates produces two changes to the structural configuration of the hull 1 frame. First, the convex change structure between the front sliding surface 11 and the rear sliding surface 14 in the original hull 1 frame is eliminated, and the convex change structure between the rear sliding surface 14 and the stern body is eliminated, so that the hull 1 frame at the three parts of the front sliding surface 11, the rear sliding surface 14 and the stern body forms a continuous and smooth transition overall structure, which greatly realizes and ensures the continuity of the structural form of the hull 1 frame; second, at the front step and rear step positions on the continuous hull 1 structure, stepped plates are respectively bonded to form convex change structures at corresponding positions, forming front and rear steps, and can realize a continuous and smooth transition between the step body and the hull 1.

[0083] After the stepped plate is laid, the stepped shape is kept intact when viewed from the outside of the hull 1, and the continuity of the internal shape of the hull 1 is also kept when viewed from the inside of the hull 1. There is no structural mutation inside or outside, and the structural form of the corresponding longitudinal components such as longitudinal girders and main keels also remains continuous.

[0084] It also includes a tail fin 5 installed on the top surface of the rear part of the hull 1. The sandwich layer 10 at the rear position of the top surface of the hull 1 is penetrated inside and outside to form an opening, and another narrow connecting platform 2 is extended upward from the edge of the opening. The downward end of the tail fin 5 is plugged into the narrow connecting platform 2.

[0085] The present invention realizes the arrangement, assembly and addition of various functional components on the hull, effectively ensures the continuity of the hull shape, and greatly ensures the overall structural strength and rigidity.

[0086] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. A convex position connection structure for a wing-in-ground-effect vehicle hull shape, comprising a hull (1), characterized in that: The hull (1) is composed of a sandwich layer (10) laid on the outside of a frame body, the sandwich layer (10) is a three-layer structure consisting of an inner layer, a sandwich layer and an outer layer, and the frame body includes a plurality of transverse frames (16) arranged at intervals along the length direction of the hull (1), and the plurality of transverse frames (16) are jointly installed with longitudinal trusses (17) at intervals along the circumference; A middle wing (4) extending toward both sides is installed in the middle of the length direction of the hull (1); When the middle wing (4) is installed on the top surface of the hull (1), the sandwich panels (10) at the top surface of the hull (1) penetrate inside and outside to form an opening, and extend upward at the edge of the opening to form a wide connection platform (3), and the bottom surface of the middle wing (4) is plugged into and matched with the wide connection platform (3); or, when the middle wing (4) is installed on the side of the hull (1), the sandwich panels (10) at the two sides of the hull (1) penetrate inside and outside to form an opening, and extend laterally at the edge of the opening to form a narrow connection platform (2), and the end of the middle wing (4) is plugged into and matched with the narrow connection platform (2); The outer frame structure of the wide connecting platform (3) and the narrow connecting platform (2) is extended from the sandwich layer (10) laid on the outer surface of the hull (1). During actual production, the sandwich layer (10) laid on the outer surface of the hull (1) is directly extended and formed after removing the middle sandwich, and the inner and outer layers are directly bonded and fixed together; Stepped plates are respectively laid along the width direction on the outer wall surfaces of the sandwich panels (10) at the middle and rear portions of the bottom surface of the hull (1), forming a front stepped surface (13) at the middle portion of the bottom surface of the hull (1) and a rear stepped surface (15) at the rear portion of the bottom surface of the hull (1); Bilge plates are also laid along the length direction on the sandwich panels (10) on both sides of the bottom of the hull (1) to form bilge bodies (12); The structure of the bilge plate is as follows: it includes a side plate (122) extending conformally downward along the side of the hull (1); a concave bottom plate (123) is installed between the bottom end of the side plate (122) and the bottom surface of the hull (1); one side edge of the concave bottom plate (123) is connected with the side plate (122) to form an acute angle, and the other side edge of the concave bottom plate (123) is conformally fitted along the bottom surface of the hull (1); and a sandwich structure (121) is filled in the closed space formed by the side plate (122), the concave bottom plate (123) and the bottom surface of the hull (1).

2. A wing-in-ground-effect craft hull shape convex change position connection structure according to claim 1, characterized in that: The length directions of the wide connecting platform (3) and the narrow connecting platform (2) are both arranged along the length direction of the hull (1), and the dimension of the wide connecting platform (3) in the width direction is greater than the dimension of the narrow connecting platform (2) in the width direction.

3. A wing-in-ground-effect craft hull shape convex change position connection structure according to claim 1, characterized in that: The structure of the wide connection platform (3) is as follows: it includes a wide outer frame (31) formed by extending upward from the opening edge of the sandwich layer (10), the wide outer frame (31) is an inner and outer double-layer structure that fits each other, the inner and outer double layers of the wide outer frame (31) are connected to the inner layer and outer layer of the sandwich layer (10) respectively, and the outer end of the wide outer frame (31) is turned inward and extended to form a flange (311); the outer wall surface of the transverse frame (16) and the longitudinal truss (17) at the opening of the sandwich layer (10) are jointly installed with a base plate (34), the top surface of the base plate (34) is installed with a transverse support plate (33) along the direction of the transverse frame (16), and the top surface of the base plate (34) is installed with a longitudinal support plate (32) along the direction of the longitudinal truss (17); the two ends of the longitudinal support plate (32) and the transverse support plate (33) are respectively tightly attached to the inner wall surface of the wide outer frame (31).

4. A wing-in-ground-effect craft hull shape convex change position connection structure according to claim 1, characterized in that: The structure of the narrow connecting platform (2) is as follows: it includes a narrow outer frame (21) formed by extending upward from the opening edge of the sandwich layer (10), the narrow outer frame (21) is an inner and outer double-layer structure that fits each other, the inner and outer double layers of the narrow outer frame (21) are connected with the inner layer and outer layer of the sandwich layer (10) respectively, and the outer end of the narrow outer frame (21) is turned inward and extended to form a second flange (211); the outer wall surface of the transverse frame (16) at the opening of the sandwich layer (10) is installed with a base narrow plate (23), and the top surface of the base narrow plate (23) is installed with a wing thick support plate (22) along the direction of the transverse frame (16), and the two ends of the wing thick support plate (22) are respectively tightly attached to the inner wall surface of the narrow outer frame (21).

5. The convex position connection structure of the hull shape of a wing-in-ground-effect vehicle according to claim 1, characterized in that: The structure of the stepped plate is as follows: it includes a horizontally arranged bottom plate (131), the distance between the front top surface of the bottom plate (131) and the bottom surface of the hull (1) gradually decreases until they are conformally fitted to each other, and a vertically arranged rear plate (134) is installed between the rear of the bottom plate (131) and the bottom surface of the hull (1) to form a stepped surface; side plates (132) are installed between the two side edges of the bottom plate (131) and the bottom end of the side of the hull (1), and the side plates (132) are conformally fitted to the side of the hull (1); and a sandwich structure 2 (133) is filled in the closed space formed by the bottom plate (131), the two side side plates (132), the rear plate (134) and the bottom surface of the hull (1).

6. A wing-in-ground-effect craft hull shape convex change position connection structure according to claim 5, characterized in that: The bottom plate (131) is in a V-shaped structure with the opening facing upward.

7. A wing-in-ground-effect craft hull shape convex change position connection structure according to claim 5, characterized in that: The top end of the rear plate (134) is in contact with the bottom surface of the hull (1) and an extension plate (135) is extended backwards, and the extension plate (135) is conformal to the bottom of the hull.

8. The convex change position connection structure of the hull shape of a wing-in-ground-effect vehicle according to claim 1, characterized in that: The stepped plate at the front stepped surface (13) extends forward and conforms to the bottom surface of the hull (1), forming a front sliding surface (11); the stepped plate at the rear stepped surface (15) extends forward and conforms to the bottom surface of the hull (1), forming a rear sliding surface (14).

9. The convex change position connection structure of the hull shape of a wing-in-ground-effect vehicle according to claim 1, characterized in that: It also includes a tail wing (5) installed on the top surface of the rear part of the hull (1), and the sandwich layer (10) at the rear position of the top surface of the hull (1) is penetrated inside and outside to form an opening, and another narrow connecting platform (2) is extended upward from the edge of the opening, and the downward end of the tail wing (5) is plugged into and matched with the narrow connecting platform (2).

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