Multi-stage energy dissipation flexible inflatable arch structure with shock wave clipping capability

Abstract

The present application provides a multi-stage energy dissipation flexible inflatable arch structure with shock wave clipping capability, which adopts a multi-stage energy dissipation mode to enhance the protection performance, and adopts an inflatable structure, thereby being capable of maintaining high mobility while improving the explosion shock protection performance. The multi-stage energy dissipation flexible inflatable arch structure comprises a support arch and an inflatable arch. The support arch is a double-layer arch rod structure comprising two groups of upper and lower arch rods. A plurality of inflatable cells are arranged circumferentially between the two groups of arch rods to form the inflatable arch. The inflatable cells comprise low-pressure cells and high-pressure cells. The low-pressure cells and the high-pressure cells are arranged alternately. The inflatable cells and the double-layer arch rod structure are multiphase composite to form a "rigid-flexible" cooperative resistance mechanism, which can improve the structure collapse threshold. Moreover, the plurality of inflatable cells are arranged between the double-layer arch rod structure to form a non-uniform stiffness arch space. Macroscopically, the shock wave energy is fully consumed in a multi-stage steady state through stiffness regulation, thereby enhancing the protection performance.

Description

Technical Field

[0001] This invention relates to an inflatable arch structure, specifically a multi-stage energy-dissipating flexible inflatable arch structure with shock wave clipping capability, belonging to the field of public safety protection technology. Background Technology

[0002] Modern warfare demands high mobility in the field, often employing lightweight, easily deployable, and highly mobile protective structures such as nylon tents, purely inflatable ribbed hangars, and composite fiber radomes to provide temporary protection for personnel and high-value targets for standoffs and confrontations. Explosions generate various hazards, including high-pressure shock waves and high-speed fragments. While localized damage from blast fragments can often be mitigated by flexible structures such as multi-layered high-performance fibers, these structures are vulnerable to the destructive power of blast shock waves characterized by strong transients, high peak values, and wide ranges. When encountering such shock waves, their low overall stiffness and weak protective capabilities can cause significant damage to personnel and equipment. Therefore, developing protective structures that combine strong blast resistance with portability and easy deployment has become an inevitable trend. Summary of the Invention

[0003] In view of this, the present invention provides a multi-stage energy-dissipating flexible inflatable arch structure with shock wave clipping capability. It enhances the protective performance by adopting a multi-stage energy dissipation method and adopts an inflatable structure, thereby improving the explosive impact protection performance while maintaining high mobility.

[0004] A multi-stage energy-dissipating flexible inflatable arch structure with shock wave clipping capability includes: a support arch and an inflatable arch; the support arch is a double-layer arch rod structure, including upper and lower sets of arch rods; multiple elastic inflatable cells are arranged circumferentially between the two sets of arch rods to form an inflatable arch.

[0005] The inflatable cell includes a low-pressure cell and a high-pressure cell; the low-pressure cell and the high-pressure cell are arranged alternately.

[0006] In a preferred embodiment of the present invention, the supporting arch comprises a plurality of double-layered arch rod structures arranged in parallel at intervals.

[0007] In a preferred embodiment of the present invention, in the inflatable arch, the air pressure in each low-pressure cell increases sequentially from top to bottom along the height direction, and the air pressure in each high-pressure cell increases sequentially from top to bottom along the height direction; and the air pressure in each layer of high-pressure cells is greater than the air pressure in the two adjacent low-pressure cells.

[0008] In a preferred embodiment of the present invention, in the inflatable arch, adjacent inflatable cells are connected by ribs.

[0009] In a preferred embodiment of the present invention, the supporting arch comprises a plurality of double-layered arch rod structures arranged in parallel at intervals.

[0010] As a preferred embodiment of the present invention, the air pressure in the high-pressure cell is greater than 20 kPa, and the air pressure in the low-pressure cell is greater than 15 kPa.

[0011] As a preferred embodiment of the present invention, the flexible inflatable arch structure is provided with a bulletproof layer on its exterior.

[0012] In a preferred embodiment of the present invention, the arch rods in the supporting arch are made of carbon fiber.

[0013] In a preferred embodiment of the present invention, the gas-filled cell is formed by filling a closed space formed by a superelastic polyurethane film with a set pressure of gas.

[0014] Beneficial effects:

[0015] (1) The present invention combines inflatable cells and double-layer arch rod structure in a multiphase composite to form a “rigid and flexible” synergistic resistance mechanism, which can improve the structural collapse threshold; and multiple inflatable cells are arranged between the double-layer arch rod structure to form an arch space with uneven stiffness. Macroscopically, the shock wave energy will be fully consumed under multi-level steady state through stiffness regulation, thereby enhancing the protective effect.

[0016] (2) In the multi-stage energy-consuming flexible air-filled arch structure of the present invention, the air-filled cell can effectively weaken the overpressure peak of the shock wave and prolong the action time of the shock wave, thereby weakening the energy of the shock wave.

[0017] (3) In the multi-stage energy-consuming flexible inflatable arch structure of the present invention, the low-pressure cell has better buffering and deformation performance, and the high-pressure cell has better support performance; the alternating arrangement of high and low pressure can balance the energy absorption buffering and anti-collapse performance of the inflatable arch structure.

[0018] (4) The multi-stage energy-dissipating flexible air arch structure can be used in conjunction with materials such as concrete and bulletproof fiber; for example, a bulletproof fiber layer is laid on the outer layer of the multi-stage energy-dissipating flexible air arch structure to give it bulletproof performance; a concrete layer is set inside or outside the multi-stage energy-dissipating flexible air arch structure as a rigid support to adapt to different usage requirements. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of one embodiment of the multi-stage energy-dissipating flexible inflatable arch structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the arch support structure;

[0021] Figure 3 This is a schematic diagram of the cell unit structure;

[0022] Figure 4 This is a schematic diagram of the multi-stage energy consumption of the flexible inflatable arch structure.

[0023] Wherein: 1-supporting arch; 2-inflatable cell; 3-high pressure reinforcing ring. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0025] Example 1:

[0026] In response to the requirements of mobile space engineering structures such as those used in field operations for strong protection, easy deployment and retrieval, and light weight, this embodiment provides a multi-stage energy-dissipating flexible inflatable arch structure with shock wave clipping capability (i.e., weakening the peak value of shock waves). The rigid-flexible composite protective equipment made with this structure improves the effectiveness of explosive impact protection while maintaining high mobility by using a multi-stage energy dissipation method.

[0027] like Figure 1 As shown, the multi-stage energy-dissipating flexible inflatable arch structure includes a supporting arch 1 and an inflatable arch;

[0028] like Figure 2 As shown, the supporting arch 1 is a double-layer arch structure, which includes two sets of arch rods, one above the other, and multiple elastic inflatable cells 2 arranged circumferentially between the two sets of arch rods (i.e., multiple inflatable cells 2 are arranged along the direction of the arch rods) to form an inflatable arch.

[0029] As an example, the arch struts in supporting arch 1 are made of carbon fiber.

[0030] As an example, the upper and lower sets of arched rods form a crescent-shaped space or an arc-shaped space of equal thickness.

[0031] The inflatable arch includes two types of inflatable cells 2 with different internal air pressures: a low-pressure cell and a high-pressure cell (the terms "low pressure" and "high pressure" refer only to the relative air pressure within the two cells), with the low-pressure and high-pressure cells spaced apart. The high-pressure cell serves as a high-pressure reinforcing ring 3, while the low-pressure cell exhibits a greater deformation than the high-pressure cell.

[0032] This flexible inflatable arch structure can absorb shock waves multiple times. Firstly, the flexible inflatable arch structure combines inflatable cells and a double-layered arch structure in a multi-phase composite, forming a synergistic "rigid-flexible" resistance mechanism that increases the structural collapse threshold. When a shock wave acts on the structure, the significant compressive deformation of the inflatable cells is constrained by the arches, reducing the overall structural sway. Secondly, after being subjected to a shock wave, the inflatable cells deform rapidly due to their elastic properties, effectively reducing the overpressure peak and prolonging the shock wave's duration. Thirdly, by alternating high- and low-pressure inflatable cells between the double-layered arch structures to create a non-uniformly stiff arched space, the shock wave energy is macroscopically dissipated under multi-level steady-state conditions through stiffness regulation, enhancing protective effectiveness. Figure 4As shown, when the flexible inflatable arch structure is subjected to an explosive shock wave at the top, the low-pressure cells closest to the shock wave will first undergo air cushion compression deformation under the action of the shock wave, which can effectively weaken the peak value of the shock wave. As the low-pressure cells are compressed and deformed, the high-pressure cells nearby can provide short-term support, thus forming another steady state of the tangential gradient cell structure. As the shock wave continues to act, the first layer of high-pressure cells cannot withstand the compression deformation; the second layer of low-pressure cells weakens due to a second overpressure peak, and the second layer of high-pressure cells nearby supports the structure, and so on, forming a tangential gradient ring, so that the shock wave energy is fully consumed under multiple steady states, thereby achieving multi-order energy dissipation.

[0033] As an example, the number of inflatable cells 2 in an inflatable arch is 2N+1, where N is an integer greater than 1; thus, between the two sets of arch rods, an inflatable cell 2 is set at the top, and N inflatable cells 2 are symmetrically set on each side (that is, the inflatable cells on both sides are symmetrically set along the inflatable cells at the top).

[0034] As an example, in an inflatable arch, the air pressure is the same in each low-pressure cell and the air pressure is the same in each high-pressure cell.

[0035] As an example, in an inflatable arch, the air pressure in each low-pressure cell increases sequentially from top to bottom along the height direction, and the air pressure in each high-pressure cell increases sequentially from top to bottom along the height direction; and the air pressure in each layer of high-pressure cells is greater than the air pressure in the two adjacent low-pressure cells.

[0036] As an example, two adjacent air cells 2 are connected by ribs to increase the strength of the connection and limit the expansion of the air cells in the thickness direction. The ribs can be made of the same material as the air membrane of the air cell 2.

[0037] As an example, the air pressure in a high-pressure cell is greater than 20 kPa, and the air pressure in a low-pressure cell is greater than 15 kPa.

[0038] As an example, the inflatable cell 2 is bonded to the upper and lower sets of arch rods by means of the upper and lower surfaces; or through holes are provided on both the upper and lower sides of the inflatable cell 2 for the arch rods to pass through, and the arch rods pass through the through holes at the corresponding positions on each inflatable cell 2 in sequence to connect the inflatable cells 2 together.

[0039] like Figure 3 As shown, as an example, the inflatable membrane of the inflatable cell 2 is made of high-performance composite membrane material (such as superelastic polyurethane). The high-strength membrane can be filled with high-pressure gas to form an inflatable structure with a certain shape and rigidity. The use of inflatable cell 2 has the following advantages: (1) Compared with the concentrated point support rod structure, the inflatable structure has higher stability; (2) The surface density of brick-concrete and steel structures is generally between 150 and 300 kg / m³.2 However, the surface density of inflatable membrane structures is generally less than 3 kg / m³. 2 It has the advantages of being portable and easy to retract; (3) the inflatable structure can continuously adjust its shape according to external conditions during the loading process to achieve structural self-adaptation. When the explosion shock wave reaches the surface of the structure, the microscopic inflatable cell 2 achieves a significant reduction in the shock wave reflection overpressure through movement, deformation, and pre-high pressure.

[0040] Meanwhile, this multi-stage energy-dissipating flexible inflatable arch structure can also be used in conjunction with materials such as concrete and bulletproof fiber; for example, a bulletproof fiber layer can be laid on the outer layer of the multi-stage energy-dissipating flexible inflatable arch structure to give it bulletproof performance; and a concrete layer can be set inside or outside the multi-stage energy-dissipating flexible inflatable arch structure as a rigid support.

[0041] Example 2:

[0042] Based on the above embodiment 1, the supporting arch 1 includes multiple double-layer arch rod structures arranged in parallel and spaced apart, which together support the inflatable arch.

[0043] If the flexible inflatable arch structure in Embodiment 1 above is applied to a large inflatable hangar, the flexible inflatable arch structure is 76.2 meters wide, 30 meters deep, and 16.8 meters high. Based on this, the supporting arch 1 includes 16 double-layer arch structures arranged side by side along the depth direction, with a 2-meter interval between adjacent double-layer arch structures. The thickness of the inflatable cell 2 is 50 centimeters (this thickness is the maximum thickness when the upper and lower sets of arches form a crescent-shaped space). The material of the inflatable cell 2 is polyurethane superelastic (TPU) composite fiber material, and the double-layer arch structure is made of Toray T700 carbon fiber material.

[0044] For example, the flexible inflatable arch structure from Embodiment 1 above is applied to a single-soldier combat tent. The flexible inflatable arch structure is 2.1 meters wide, 1 meter deep, and 0.9 meters high. Based on this, the supporting arch 1 includes two double-layer arch structures arranged side-by-side along the depth direction, with a 1-meter interval between adjacent double-layer arch structures. The thickness of the inflatable cell 2 is 50 centimeters (this thickness is the maximum thickness when the upper and lower sets of arches form a crescent-shaped space). The material of the inflatable cell 2 is polyurethane superelastic (TPU) composite fiber material, and the double-layer arch structure uses Toray T700 carbon fiber material. A 5mm thick ultra-high molecular weight polyethylene fiber orthogonal fabric is draped on the outside of the flexible inflatable arch structure as a bulletproof layer, giving it bulletproof properties.

[0045] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A multi-stage energy-dissipating flexible inflatable arch structure with shock wave clipping capability, characterized in that: include: Support arch and inflatable arch; the support arch is a double-layer arch structure, including upper and lower sets of arch rods; multiple elastic inflatable cells are arranged circumferentially between the two sets of arch rods to form an inflatable arch; The inflatable cell includes a low-pressure cell and a high-pressure cell; the low-pressure cell and the high-pressure cell are arranged alternately. In the inflatable arch, the air pressure in each low-pressure cell increases sequentially from top to bottom along the height direction, and the air pressure in each high-pressure cell increases sequentially from top to bottom along the height direction; and the air pressure in each layer of high-pressure cells is greater than the air pressure in the two adjacent low-pressure cells.

2. The multi-stage energy-dissipating flexible inflatable arch structure with shock wave clipping capability as described in claim 1, characterized in that: The supporting arch includes multiple double-layered arch rod structures arranged side by side at intervals.

3. The multi-stage energy-dissipating flexible inflatable arch structure with shock wave clipping capability as described in claim 1, characterized in that: In the inflatable arch, adjacent inflatable cells are connected by ribs.

4. The multi-stage energy-dissipating flexible inflatable arch structure with shock wave clipping capability as described in any one of claims 1-3, characterized in that: The air pressure in a high-pressure cell is greater than 20 kPa, and the air pressure in a low-pressure cell is greater than 15 kPa.

5. The multi-stage energy-dissipating flexible inflatable arch structure with shock wave clipping capability as described in any one of claims 1-3, characterized in that: The flexible inflatable arch structure is provided with a bulletproof layer on the outside.

6. The multi-stage energy-dissipating flexible inflatable arch structure with shock wave clipping capability as described in any one of claims 1-3, characterized in that: The arch rods in the supporting arch are made of carbon fiber.

7. The multi-stage energy-dissipating flexible inflatable arch structure with shock wave clipping capability as described in any one of claims 1-3, characterized in that: The inflatable cell is formed by filling a closed space formed by a superelastic polyurethane film with a set pressure of gas.

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