Metal matrix composite panel vented pressure containment head structure and design method

Abstract

The application provides a structure and a design method of a perforated pressure head of a metal framework composite panel, and belongs to the field of underwater vehicle pressure-resistant shell applications, and comprises a metal framework and a composite panel, wherein the metal framework is an integrated structure composed of a perforated flat plate, a reinforcing rib and a connecting ring; the upper part of the metal framework is provided with the perforated flat plate, the cross section of the reinforcing rib is in the shape of an I-beam, and the structural curvature is consistent with the curvature of the composite panel; the connecting ring is provided with overlapping surfaces on the upper and lower parts, the curvature of the upper overlapping surface of the connecting ring is consistent with the curvature of the composite panel; the curvature of the lower overlapping surface of the connecting ring is consistent with the curvature of the connected pressure-resistant shell, and the structural feature of the application is that the weight of the perforated pressure head structure is further reduced on the basis of realizing the communication function and ensuring the strength and stability requirements, the disadvantages of the heavy metal head and the difficulty in perforating the composite head are avoided, and the structural functional change can be realized by changing the composite sandwich structure.

Description

Technical Field

[0001] This invention belongs to the field of pressure hull applications for underwater vehicles, and particularly relates to an open-hole pressure-resistant end cap structure and design method for a metal skeleton composite material panel. Background Technology

[0002] As a core component of underwater vehicles, the pressure hull must not only ensure load-bearing capacity but also provide internal communication channels with the outside. Using openings at the end caps ensures hull integrity while allowing for internal and external communication and improving the hull's density-to-weight ratio. Traditional metal end caps are relatively lightweight, while composite material end caps suffer from fiber breakage due to openings, leading to severe stress concentration at the openings. When the pressure hull has high weight requirements, neither metal nor composite material end caps can effectively meet the application needs. Therefore, this invention aims to address the shortcomings of the above-mentioned problems. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a perforated pressure-resistant end cap structure and design method for a metal skeleton composite material panel. While effectively solving the pressure-bearing requirements, it also allows for communication between the inside and outside of the housing by opening holes in the pressure-resistant end cap.

[0004] The perforated pressure-resistant end cap structure of the metal skeleton composite panel includes a metal skeleton (1) and a composite panel (2). The metal skeleton (1) is an integral structure composed of a perforated plate (10), a reinforcing rib (11), and a connecting ring (12). The metal skeleton (1) has a perforated plate (10) on its upper part, and the edge of the plate has an overlapping surface (101). The reinforcing rib (11) has an I-shaped cross section, and its curvature is consistent with that of the composite panel (2). The connecting ring (12) has overlapping surfaces on both the upper and lower parts. The curvature of the upper overlapping surface (121) of the connecting ring is consistent with that of the composite panel (2). The lower overlapping surface (122) of the connecting ring has the same curvature as the connected pressure-resistant shell (3). The composite panel (2) has a through hole (21) at the perforated plate (10) of the metal skeleton and the upper overlapping surface (121) of the connecting ring.

[0005] The reinforcing ribs (11) are arranged in a uniform ring array.

[0006] The perforated plate (10) is provided with a through hole for communication between the inside and outside of the pressure-resistant housing; the overlapping surfaces of the plate edge (101) and the upper overlapping surface (121) of the connecting ring are provided with a threaded blind hole (102), a threaded blind hole (123), a sealing groove (103), and a sealing groove (124) for connecting and sealing with the composite material panel (2); the overlapping surface (122) of the lower part of the connecting ring is provided with a threaded blind hole (125) and a sealing groove (126) for connecting and sealing with the pressure-resistant housing (3); before connection, a sealing ring is placed in the sealing groove (103), the sealing groove (124), and the sealing groove (126) to ensure the airtightness requirements.

[0007] The composite material panel (2) can be configured with structural parameters according to the specific load-bearing requirements of the structure, and the inner surface can be provided with circumferential reinforcing ribs (22) to increase the structural stiffness.

[0008] The composite material panel (2) can be configured with structural parameters according to the specific load-bearing requirements of the structure. The inner surface can be provided with a composite material panel sandwich structure (23), and sound-absorbing material or buoyancy material can be added to the sandwich.

[0009] The composite material panel (2) may be made of laminate or sandwich structure core material;

[0010] The number and size of the through holes in the perforated plate (10) can be determined according to the spatial layout and communication connection requirements.

[0011] The composite material panel (2) and the perforated plate (10) of the metal frame are mechanically connected to the metal frame (1) by bolts (4).

[0012] A design method for an open-hole pressure-resistant end cap structure of a metal-framed composite material panel, characterized by the following steps:

[0013] 1) Determine the overall structural parameters of the opening head, specifically: determine the structural design radius based on the size of the pressure-resistant shell, and determine the head height and the number and size of openings based on the spatial layout and communication connection requirements.

[0014] 2) Determine the structural parameters of the composite panel, specifically: determine the shape and structural form of the busbar according to the load-bearing requirements and application needs; if a sandwich structure is adopted, select the sandwich material according to the application requirements.

[0015] 3) Determine the structural parameters of the metal frame, specifically: determine the material and geometric dimensions of the metal frame according to the load-bearing requirements, and determine the dimensions of the sealing ring and sealing groove according to the airtightness requirements.

[0016] This also includes step 4) Refining and adjusting the design scheme, which specifically refers to: verifying the strength and stability based on finite element simulation. If the verification fails, return to step 2) to readjust.

[0017] Beneficial effects:

[0018] 1. The design parameters and dimensions of the perforated pressure-resistant end cap structure of the metal skeleton composite material panel of the present invention shall be adjusted according to the load-bearing and application requirements. The specific structural parameters shall be calculated and tested based on structural mechanics to ensure mechanical performance.

[0019] 2. The composite material panel of the perforated pressure-resistant end cap structure can select structural parameters according to the specific load-bearing requirements of the structure, or it can be changed to a sandwich structure according to application requirements, with sound-absorbing materials or buoyancy materials added to the sandwich, to meet different requirements and needs.

[0020] 3. The structural feature of this invention is that it can achieve communication functions through openings while ensuring strength and stability requirements, and further reduces the weight of the pressure-resistant end cap structure with openings. It avoids the disadvantages of heavy metal end caps and the difficulty of openings in composite material end caps, and can also achieve structural functionality changes by modifying the composite material sandwich structure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the metal skeleton structure of the pressure-resistant end cap with opening.

[0022] Figure 2 This is a schematic diagram of the composite material panel structure of the pressure-resistant end cap with opening.

[0023] Figure 3 This is a schematic diagram of the inner surface structure of the composite material panel of the perforated pressure-resistant end cap.

[0024] Figure 4 This is a complete schematic diagram of the structure of the perforated pressure-resistant end cap.

[0025] Figure 5 This is a schematic diagram of the cross-section of the reinforcing rib in Embodiment 1 of the pressure-resistant end cap with opening.

[0026] Figure 6 This is a schematic diagram of the cross-section of the reinforcing rib in Embodiment 2 of the pressure-resistant end cap with opening.

[0027] Among them, the metal frame (1), the perforated plate (10), the plate edge overlap surface (101), the plate overlap surface threaded blind hole (102), the plate overlap surface sealing groove (103), the reinforcing rib (11), the connecting ring (12), the upper overlap surface of the connecting ring (121), the lower overlap surface of the connecting ring (122), the upper overlap surface threaded blind hole (123), the upper overlap surface sealing groove (124), the lower overlap surface threaded blind hole (125), the lower overlap surface sealing groove (126), the composite material panel (2), the composite material panel through hole (21), the inner surface circumferential reinforcing rib (22), the panel composite material panel sandwich structure (23), the pressure-resistant shell (3), and the bolt (4). Detailed Implementation

[0028] The present invention will be described in detail below with reference to specific embodiments.

[0029] like Figure 1-6 As shown, the present invention provides a perforated pressure-resistant end cap structure and design method for a metal skeleton composite material panel. Specifically, it includes a metal skeleton (1) and a composite material panel (2). The metal skeleton (1) is an integral structure composed of a perforated plate (10), reinforcing ribs (11), and a connecting ring (12). The metal skeleton (1) has a perforated plate (10) on its upper part, and the edge of the plate has an overlapping surface (101). The cross-section of the reinforcing rib (11) is I-shaped, and the curvature of the structure is consistent with that of the composite material panel (2). The connecting ring (12) has overlapping surfaces on both the upper and lower parts. The curvature of the upper overlapping surface (121) of the connecting ring is consistent with that of the composite material panel (2). The lower overlapping surface (122) of the connecting ring has the same curvature as the connected pressure-resistant shell (3). The composite material panel (2) has through holes (21) at the perforated plate (10) of the metal skeleton and the upper overlapping surface (121) of the connecting ring. The reinforcing ribs (11) are uniformly arranged in a ring array.

[0030] The perforated plate (10) is provided with a through hole for communication between the inside and outside of the pressure-resistant housing; the overlapping surfaces of the plate edge (101) and the upper overlapping surface (121) of the connecting ring are provided with a threaded blind hole (102), a threaded blind hole (123), a sealing groove (103), and a sealing groove (124) for connecting and sealing with the composite material panel (2); the overlapping surface (122) of the lower part of the connecting ring is provided with a threaded blind hole (125) and a sealing groove (126) for connecting and sealing with the pressure-resistant housing (3); before connection, a sealing ring is placed in the sealing groove (103), the sealing groove (124), and the sealing groove (126) to ensure the tightness requirements.

[0031] The composite material panel (2) can select structural parameters according to the specific load-bearing requirements of the structure, and the inner surface can be provided with circumferential reinforcing ribs (22) to increase the structural stiffness.

[0032] The composite panel (2) can be configured with structural parameters according to the specific load-bearing requirements of the structure. The inner surface can be provided with a composite panel sandwich structure (23), and sound-absorbing material or buoyancy material can be added to the sandwich. The composite panel (2) can be made of laminate or sandwich structure core material;

[0033] The number and size of the through holes in the perforated plate (10) can be determined according to the spatial layout and communication connection requirements.

[0034] The composite panel (2) and the perforated plate (10) of the metal frame are mechanically connected to the metal frame (1) by bolts (4).

[0035] A design method for an open-hole pressure-resistant end cap structure of a metal-framed composite material panel, characterized by the following steps:

[0036] 1) Determine the overall structural parameters of the opening head, specifically: determine the structural design radius based on the size of the pressure-resistant shell, and determine the head height and the number and size of openings based on the spatial layout and communication connection requirements.

[0037] 2) Determine the structural parameters of the composite panel, specifically: determine the shape and structural form of the busbar according to the load-bearing requirements and application needs; if a sandwich structure is adopted, select the sandwich material according to the application requirements.

[0038] 3) Determine the structural parameters of the metal frame, specifically: determine the material and geometric dimensions of the metal frame according to the load-bearing requirements, and determine the dimensions of the sealing ring and sealing groove according to the airtightness requirements.

[0039] This also includes step 4) Refining and adjusting the design scheme, which specifically refers to: verifying the strength and stability based on finite element simulation. If the verification fails, return to step 2) to readjust.

[0040] This invention is an improved design based on the conventional perforated end cap structure. Its structural features include the ability to perform communication functions through perforations while ensuring strength and stability requirements, while further reducing the weight of the pressure-resistant end cap structure. It avoids the disadvantages of heavy metal end caps and the difficulty of perforating composite material end caps, and can also achieve functional changes by modifying the composite material sandwich structure.

[0041] This invention provides a perforated pressure-resistant end cap for a metal-framed composite material panel, comprising a metal frame and a composite material panel. The metal frame is an integral structure composed of a perforated flat plate, reinforcing ribs, and a connecting ring. The metal frame has a perforated flat plate at its upper part, with overlapping surfaces at the edges. The reinforcing ribs have an I-shaped cross-section. The connecting ring has upper and lower overlapping surfaces, both of which have threaded blind holes and sealing grooves to ensure mechanical connection and airtightness.

[0042] The design parameters and dimensions of the perforated pressure-resistant end cap structure of the metal skeleton composite material panel of the present invention are adjusted according to the load-bearing and application requirements. The specific structural parameters should be calculated and tested based on structural mechanics to ensure mechanical performance.

[0043] The composite material panel of the perforated pressure-resistant end cap structure can select structural parameters according to the specific load-bearing requirements of the structure, or it can be changed to a sandwich structure with sound-absorbing materials or buoyancy materials added to the core according to the application requirements.

[0044] Furthermore, the composite panel can be replaced with a sandwich structure, in which PVC / buoyancy material is filled on both sides of the web of the reinforcing ribs, and the internal composite material layup is consistent with the surface layer. A cross-sectional diagram of the reinforcing ribs is shown below. Figure 6 As shown in the figure. This embodiment can achieve sound absorption or sound transmission functions of the end cap by changing the interlayer material.

[0045] Finally, it should be noted that the basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification, and therefore remain within the spirit and scope of the exemplary embodiments of this specification. Furthermore, this specification uses specific terms to describe embodiments of this specification. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined. Moreover, unless expressly stated in the claims, the order of processing elements and sequences, the use of numbers and letters, or other names described in this specification are not intended to limit the order of the processes and methods of this specification.

[0046] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A perforated pressure-resistant end cap structure for a metal-framed composite material panel, comprising a metal frame (1) and a composite material panel (2), characterized in that... The metal frame (1) is an integral structure consisting of a perforated flat plate (10), reinforcing ribs (11), and connecting rings (12); The metal frame (1) has an open plate (10) on its upper part, and the edge of the plate has an overlapping surface (101). The cross section of the reinforcing rib (11) is I-shaped, and the curvature of the structure is consistent with the curvature of the composite material panel (2); The connecting ring (12) has overlapping surfaces at both the top and bottom. The curvature of the upper overlapping surface (121) of the connecting ring is consistent with that of the composite material panel (2); the curvature of the lower overlapping surface (122) of the connecting ring is consistent with that of the connected pressure-resistant shell (3). The composite material panel (2) is provided with a through hole (21) at the upper overlapping surface (121) of the perforated plate (10) of the metal frame and the connecting ring.

2. The perforated pressure-resistant end cap structure of the metal skeleton composite material panel according to claim 1, characterized in that, The reinforcing ribs (11) are arranged in a uniform ring array.

3. The perforated pressure-resistant end cap structure of the metal skeleton composite material panel according to claim 1, characterized in that, The perforated plate (10) is provided with a through hole for communication between the inside and outside of the pressure-resistant housing; the overlapping surfaces of the plate edge (101) and the upper overlapping surface (121) of the connecting ring are provided with a threaded blind hole (102), a threaded blind hole (123), a sealing groove (103), and a sealing groove (124) for connecting and sealing with the composite material panel (2); the overlapping surface (122) of the lower part of the connecting ring is provided with a threaded blind hole (125) and a sealing groove (126) for connecting and sealing with the pressure-resistant housing (3); before connection, a sealing ring is placed in the sealing groove (103), the sealing groove (124), and the sealing groove (126) to ensure the airtightness requirements.

4. The perforated pressure-resistant end cap structure of the metal skeleton composite material panel according to claim 1, characterized in that, The composite material panel (2) can be configured with structural parameters according to the specific load-bearing requirements of the structure, and the inner surface can be provided with circumferential reinforcing ribs (22) to increase the structural stiffness.

5. The perforated pressure-resistant end cap structure of the metal skeleton composite material panel according to claim 1, characterized in that, The composite material panel (2) can be configured with structural parameters according to the specific load-bearing requirements of the structure. The inner surface can be provided with a composite material panel sandwich structure (23), and sound-absorbing material or buoyancy material can be added to the sandwich.

6. The perforated pressure-resistant end cap structure of the metal skeleton composite material panel according to claim 1, characterized in that, The composite panel (2) adopts a laminate or sandwich structure core material.

7. The perforated pressure-resistant end cap structure of the metal skeleton composite material panel according to claim 1, characterized in that, The number and size of the through holes in the perforated plate (10) can be determined according to the spatial layout and communication connection requirements.

8. The perforated pressure-resistant end cap structure of the metal skeleton composite material panel according to claim 1, characterized in that, The composite material panel (2) and the perforated plate (10) of the metal frame are mechanically connected to the metal frame (1) by bolts (4).

9. The design method of the perforated pressure-resistant end cap structure of the metal skeleton composite panel according to any one of claims 1-8, characterized in that, Includes the following steps: 1) Determine the overall structural parameters of the opening head, specifically: determine the structural design radius based on the dimensions of the pressure-resistant shell, and determine the head height and the number and size of openings based on the spatial layout and communication connection requirements; 2) Determine the structural parameters of the composite panel, specifically: determine the shape and structural form of the busbar according to the load-bearing requirements and application needs; if a sandwich structure is adopted, select the sandwich material according to the application requirements. 3) Determine the structural parameters of the metal frame, specifically: determine the material and geometric dimensions of the metal frame according to the load-bearing requirements, and determine the dimensions of the sealing ring and sealing groove according to the airtightness requirements.

10. The method for designing an opening pressure-resistant end cap for a metal skeleton composite panel according to claim 9, characterized in that, This also includes step 4), which involves refining and adjusting the design scheme. Specifically, this means verifying the strength and stability based on finite element simulation. If the verification fails, the process returns to step 2) for readjustment.

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