A method for protecting a gate from the effects of a landslide surge

Abstract

The application discloses a gate protection method with weakened landslide surge effect, comprising the following steps: fixing a protection device to the front part of a gate panel through a connecting piece; filling a foam aluminum filler in a carbon fiber frame to form the protection device; and determining the thickness of the protection device, which comprises the following steps: obtaining a water level change time curve before a dam; calculating the static force response of each component of the gate under normal water storage level; calculating the dynamic response of each component of the gate under the action of landslide surge without the protection device and under different protection thicknesses; calculating the protection efficiency after adding the protection device with the corresponding thickness according to the static force response and the dynamic response of each component of the gate under the action of landslide surge without the protection device and under different protection thicknesses; and determining the thickness of the protection device according to the protection efficiency. The method can weaken the impact of landslide surge on the gate and is suitable for the safety protection design of a hydraulic steel gate in a reservoir area with landslides.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic steel gates, and in particular relates to a gate protection method capable of reducing the effect of landslide surge. Background Art

[0002] Flat steel gates are primarily composed of panels, vertical beams, main beams, and side beams. The panels withstand water pressure and other external loads, transmitting these forces to the gate's supporting structure through structural components such as the main beam, vertical beams, and side beams. Hydraulic steel gates are the key to regulating flow in large-scale water conservancy and hydropower projects. Their safe and stable operation is directly related to the safety of the entire water conservancy project and the lives and property of people downstream.

[0003] Landslide surge is a natural geological disaster. The hydrodynamic pressure of a landslide entering the water can adversely affect the metal gate structure at the hydropower station's water intake. If the gate fails, not only will the safe and stable operation of the hydropower station be affected, but the lives and property of people living downstream could also suffer significant losses.

[0004] Prior art researchers focused on the generation and propagation of landslide surge waves and their interaction with dams, often overlooking their impact on hydraulic steel gates. Currently, standards for hydraulic steel gate protection are still lacking. Currently, effective measures to mitigate wave impacts on gates rely on installing wave barriers and gratings upstream of the gates, along with vents at the bottom of the breastwork. However, technical personnel have only employed qualitative, rather than quantitative, analysis of the effectiveness of these protection methods. Summary of the Invention

[0005] Purpose: To address the deficiencies of the prior art and address the problem of adverse effects of landslide surge water pressure on gates, the present invention provides a gate protection method that can reduce the effect of landslide surges. In the event of a landslide surge, the impact of the landslide surge on the gate can be reduced, thereby ensuring the safety and stability of the gate.

[0006] Technical solution: To solve the above technical problems, the present invention provides a gate protection method that can reduce the effect of landslide surge. The technical solution adopted is:

[0007] The present invention provides a gate protection method capable of reducing the effect of landslide surge, comprising:

[0008] The protective device is fixed to the front of the gate panel through a connector to reduce landslide surges; wherein the protective device includes a foam aluminum filler and a carbon fiber frame; the foam aluminum filler is filled in the carbon fiber frame to form the protective device, wherein the carbon fiber frame is a square hollow structure, and the width and height are determined according to the gate panel;

[0009] The method for determining the thickness of the protective device includes:

[0010] Step S1, obtaining a time history curve of the water level change in front of the dam;

[0011] Step S2, calculating the static response of each gate component at a normal water level; the static response includes static displacement and static Mises stress; wherein the gate components include the face plate, main crossbeam web, vertical beam web, side beam web, and the gate as a whole;

[0012] Step S3, based on the time history curve of the water level change in front of the dam, using the fluid-solid coupling method of the Navier-Stokes equation to calculate the dynamic response of each gate component under the action of the landslide surge when there is no protective device and at different protection thicknesses; the dynamic response of each gate component when there is no protective device includes the unprotected displacement and the unprotected Mises stress, and the dynamic response of each gate component at different protection thicknesses includes the protected displacement and the protected Mises stress corresponding to the protection thickness;

[0013] Step S4, calculating the protection efficiency after installing a protection device of corresponding thickness based on the static response and the dynamic response of each gate component under the action of landslide surge at different protection thicknesses when there is no protection device; wherein the protection efficiency includes displacement protection efficiency and stress protection efficiency;

[0014] Step S5: determining the thickness of the protective device according to the protective efficiency.

[0015] In some embodiments, after step S5, the method further includes: determining the thickness of the foam aluminum filler according to the determined thickness of the protective device and the thickness of the carbon fiber frame.

[0016] In some embodiments, obtaining a time history curve of water level change in front of the dam includes:

[0017] The landslide surge in the reservoir area was simulated using the numerical simulation method of computational fluid dynamics-discrete element method-immersed boundary method CFD-DEM-IBM, and the time history curve of the water level change in front of the dam was obtained.

[0018] In some embodiments, in step S2, the hydrostatic pressure head of the gate is 62 m at a normal water level.

[0019] In some embodiments, calculating the static response of each gate component at a normal water level includes:

[0020] Based on the gate's deadweight and the hydrostatic pressure at normal water level, the static response of each gate component is calculated using finite element static analysis.

[0021] The static analysis equation of the gate structure is: ;

[0022] in, is the overall stiffness matrix in the global coordinate system; is the displacement array in the global coordinate system; is the load matrix in the global coordinate system;

[0023] The displacement components are obtained by solving the static analysis equation of the gate structure;

[0024] Substituting the displacement components into the plane stress and bending stress calculation equations, the static displacement and static Mises stress of each gate component in the corresponding local coordinate system are obtained.

[0025] In some embodiments, step S3 includes:

[0026] An initial water head is set in the water body in front of the gate. Based on the time history curve of the water level change in front of the dam, the interaction between fluid and solid in the reservoir water-protection-gate fluid-solid coupling model is considered. The fluid-solid coupling method of the Navier-Stokes equation is used to calculate the dynamic response of each gate component under the action of landslide surge when there is no protection device and at different protection thicknesses.

[0027] The reservoir water-protection-gate fluid-solid coupling model includes the protection device being fixed to the front of the gate panel through a connector to reduce the landslide surge of the reservoir water.

[0028] In some embodiments, in step S4, the protection efficiency after installing the protective device of corresponding thickness is calculated based on the static response and the dynamic response of each gate component under the action of landslide surge at different protection thicknesses when there is no protective device, including:

[0029] Displacement protection efficiency = (displacement without protection - displacement with protection) / static displacement × 100%;

[0030] Stress protection efficiency = (Mises stress without protection - Mises stress with protection) / static Mises stress × 100%.

[0031] In some embodiments, the thickness of the protective device needs to be calculated based on the results to ensure the normal operation of the gate during the opening and closing process.

[0032] In some embodiments, the foam aluminum filler is made of foam aluminum, and the foam aluminum material has a density of 450 kg / m³, an elastic modulus of 0.27 GPa, and a Poisson's ratio of 0.32.

[0033] In some embodiments, the carbon fiber frame is made of carbon fiber, the carbon fiber material density is 1800 kg / m³, the elastic modulus is 12.9 GPa, and the Poisson's ratio is 0.3.

[0034] Furthermore, in some embodiments, the foam aluminum filler is used for buffering and energy absorption; the carbon fiber frame is used to reduce the deformation of the foam aluminum filler under hydrostatic pressure, ensuring that the foam aluminum filler plays a role in buffering and energy absorption.

[0035] Beneficial effects: The present invention determines the thickness of the gate protection by obtaining the time-series curve of the water level change in front of the dam and the gate structure parameters, and then calculates the protection efficiency of the protection device. Compared with the existing technology, the gate protection thickness and protection efficiency are calculated according to the fluid-solid coupling, which is convenient for engineering designers to determine the appropriate protection thickness and ensure the safe and stable operation of the gate; the present invention provides a gate protection method with the effect of reducing landslide surges, and a protection device with carbon fiber as the frame and foam aluminum as the filler is provided to reduce the impact of landslide surges on the steel gate. It is suitable for the safety protection design of hydraulic steel gates with landslides in reservoir areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of a rapid emergency gate and gate protection method at a water inlet of a hydropower station according to an embodiment of the present invention;

[0037] Figure 2 Schematic diagram of the time history curve of the water level change in front of the dam in an embodiment of the present invention;

[0038] Figure 3 Schematic diagram of the reservoir water-protection-gate fluid-solid coupling model in an embodiment of the present invention;

[0039] Figure 4 Schematic diagram of the relationship between the protection thickness and protection efficiency of the gate protection device in an embodiment of the present invention.

[0040] In the figure: 1 protective device, 2 foam aluminum filler, 3 carbon fiber frame, 4 connecting piece, 5 rigid cover assumption, 6 non-slip solid wall, 7 fluid-solid coupling surface. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0042] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0043] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are used only to explain the relative positional relationships and movement of components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. These terms are used solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application.

[0044] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0046] Example 1: Figure 1 As shown, this embodiment provides a gate protection method capable of reducing the effect of landslide surge, including:

[0047] The protective device 1 is fixed to the front of the gate panel through a connector 4 to reduce landslide surges. The protective device 1 includes a foam aluminum filler 2 and a carbon fiber frame 3. The foam aluminum filler 2 is filled in the carbon fiber frame 3 to form the protective device 1. The carbon fiber frame 3 is a hollow cube structure with a width and height determined according to the gate panel. The thickness of the protective device is determined by:

[0048] Step S1, obtaining a time history curve of the water level change in front of the dam;

[0049] In some embodiments, step S1 may include: simulating landslide surges in the reservoir area according to a numerical simulation method of computational fluid dynamics-discrete element method-immersed boundary method CFD-DEM-IBM to obtain a time history curve of water level changes in front of the dam.

[0050] Step S2, calculating the static response of each gate component at a normal water level; the static response includes static displacement and static Mises stress; wherein the gate components include the face plate, main crossbeam web, vertical beam web, side beam web, and the gate as a whole;

[0051] In some embodiments, in step S2, calculating the static response of each gate component at the normal water level may include:

[0052] Based on the gate's deadweight and the hydrostatic pressure at normal water level, the static response of each gate component is calculated using finite element static analysis.

[0053] The static analysis equation of the gate structure is: ;

[0054] in, is the overall stiffness matrix in the global coordinate system; is the displacement array in the global coordinate system; is the load matrix in the global coordinate system;

[0055] The displacement components are obtained by solving the static analysis equation of the gate structure;

[0056] Substituting the displacement components into the plane stress and bending stress calculation equations, the static displacement and static Mises stress of each gate component in the corresponding local coordinate system are obtained.

[0057] Step S3, based on the time history curve of the water level change in front of the dam, using the fluid-solid coupling method of the Navier-Stokes equation to calculate the dynamic response of each gate component under the action of the landslide surge when there is no protective device and at different protection thicknesses; the dynamic response of each gate component when there is no protective device includes the unprotected displacement and the unprotected Mises stress, and the dynamic response of each gate component at different protection thicknesses includes the protected displacement and the protected Mises stress corresponding to the protection thickness;

[0058] In some embodiments, when calculating the dynamic response, an initial water head is set in the water body in front of the gate, and then the dynamic response of each gate component before and after the installation of the protective device is calculated based on the fluid-structure coupling method of the Navier-Stokes equation. In this embodiment, the reservoir water-protection-gate fluid-structure coupling model is as follows: Figure 3 As shown, the protective device is fixed to the front of the gate panel via connectors to mitigate the impact of surges on the gate. The top boundary of the reservoir water is assumed to be a rigid cover 5, the front and rear boundaries and the bottom boundary are non-slip solid walls 6, and the lateral boundaries are sliding solid walls. A fluid-solid coupling surface 7 is provided between the reservoir water and the protective device.

[0059] Step S4, calculating the protection efficiency after installing a protection device of corresponding thickness based on the static response and the dynamic response of each gate component under the action of landslide surge at different protection thicknesses when there is no protection device; wherein the protection efficiency includes displacement protection efficiency and stress protection efficiency;

[0060] In some embodiments, step S4 may include:

[0061] Displacement protection efficiency = (displacement without protection - displacement with protection) / static displacement × 100%;

[0062] Stress protection efficiency = (Mises stress without protection - Mises stress with protection) / static Mises stress × 100%.

[0063] Step S5: determining the thickness of the protective device according to the protective efficiency.

[0064] It should be noted that the thickness of the protective device should not only meet the protection efficiency requirements, but also ensure the normal operation of the gate during the opening and closing process.

[0065] In some embodiments, after step S5, the method further includes: determining the thickness of the foam aluminum filler according to the determined thickness of the protective device and the thickness of the carbon fiber frame.

[0066] In some embodiments, the connecting member 4 is a bolt.

[0067] In this embodiment, the thickness of the carbon fiber frame is relatively fixed, and the thickness of the foam aluminum filler is equal to the thickness of the determined protective device minus the thickness of the carbon fiber frame on two sides.

[0068] In this application, the foam aluminum material has the function of buffering and absorbing energy; the carbon fiber frame can reduce the deformation of the foam aluminum under hydrostatic pressure, ensuring that the foam aluminum filler plays the role of buffering and absorbing energy; the connecting piece is used to fix the protective device to the front of the gate panel.

[0069] The carbon fiber material used in this embodiment has a density of 1800 kg / m³, an elastic modulus of 12.9 GPa, and a Poisson's ratio of 0.3.

[0070] The aluminum foam material used in this embodiment has a density of 450 kg / m³, an elastic modulus of 0.27 GPa, and a Poisson's ratio of 0.32.

[0071] In this embodiment, an analytical computational fluid dynamics (CFD)-discrete element method (DIM)-immersed boundary method (IMM) (i.e., CFD-DEM-IBM method) is used to simulate landslide surges in the reservoir area to obtain a time-history curve of water level changes in front of the dam. The dynamic water pressure obtained from the numerical simulation of the landslide surge is converted into nodal loads applied to the finite element model of the gate. The dynamic time-history method is used to obtain the dynamic response of the flat gate under the action of the landslide surge. This is used to evaluate the safety of the gate and provide a scientific basis for the safe and stable operation of the hydropower station.

[0072] In some embodiments, the fluid-structure interaction method based on the Navier-Stokes equations includes:

[0073] (1) Finite element equations for incompressible viscous fluids

[0074] The continuity equation and Navier-Stokes equations for incompressible viscous fluids are:

[0075]

[0076]

[0077] Where: is the flow rate, t is the time, is the fluid density, p is the pressure, is the viscous stress tensor, is the fluid dynamic viscosity coefficient, is the fluid strength term, is the gradient symbol.

[0078] (2) Fluid-structure coupling strategy and solution

[0079] In a fluid-solid coupling system, the pressure of the fluid on the gate causes the gate to deform, and the gate in turn acts on the fluid, affecting the distribution of the flow field. The motion boundary conditions (displacement coordination) and dynamic boundary conditions (force balance) should be met on the fluid-solid coupling surface:

[0080]

[0081] Where, 、 are the stresses of fluid and solid structure respectively; 、 are the displacements of the fluid and solid structure respectively. n is the normal vector of the coupling surface.

[0082] The discrete coupled system equations can be expressed as:

[0083]

[0084]

[0085] Where, 、 、 They represent velocity increment, pressure increment, and displacement increment respectively. and Represent the right-hand side terms of the fluid and solid control equations after discretization. , , The iterative calculation process is as follows:

[0086] (1) The motion and deformation of the solid at the k-1th iteration of the n+1th time step As the known condition of the kth iteration of the current n+1th time step, the coupling relationship between the fluid and the solid is released, and the velocity and pressure of the nth time step are , Solve for the velocity and pressure of the fluid at the kth iteration of the n+1th time step , ;

[0087] (2) According to Obtain the free surface position and the physical property parameters of any point in the fluid domain;

[0088] (3) According to , Solve the force of the fluid on the solid, and on this basis, the motion and deformation of the solid at the kth iteration of the n+1th time step can be calculated ;

[0089]

[0090]

[0091] (4) According to Convergence judgment is performed, where Can be a variable , as well as , Corresponding to each variable If the convergence condition is met, the iteration is exited and the calculation of the next time step is performed. Otherwise, the above iterative process is repeated and the k+1th iteration of the n+1th time step is performed.

[0092] In a dynamic water flow field, solving the perturbed flow field of a fluid elastic body problem is not only related to the deformation of the elastic body, but also to the initial state. In this case, the perturbed water pressure not only generates additional mass, but also additional damping terms and additional stiffness terms.

[0093] Application example: The overall structure diagram of the gate structure and protective device is as follows Figure 1 As shown, a gate protection method with the function of reducing landslide surge is provided at the front of the gate panel. The protection device 1 is formed by foam aluminum filler 2 filled in a carbon fiber frame 3. The protection device 1 is fixed to the front of the gate panel through a connector 4 to reduce landslide surge.

[0094] In this embodiment, the gate structural parameters include: gate material and gate deadweight. In this embodiment, the gate structure is mainly made of Q355 steel. In the finite element calculation, the gate components are treated as linear elastic materials. The gravity acceleration is in the -z direction and the magnitude is 9.81 m / s. 2 The gate opening dimensions (clear width × clear height) are 7 m × 11 m, with a waterstop installed downstream. The inlet sill elevation is 2205.00 m, and the platform elevation is 2287.00 m. When the gate is closed, the normal water level design head is 62 m, with a waterstop installed downstream.

[0095] The time history curve of the water level change in front of the dam in this embodiment is as follows: Figure 2 As shown in Figure 1, the initial state of the reservoir water surface is set according to the law of wave elements.

[0096] Through finite element static calculation, the static response of each gate component under normal water level is obtained.

[0097] Reservoir water-protection-gate fluid-solid coupling model Figure 3 As shown in Figure 1, the protection efficiency of the protective device is calculated using the fluid-structure coupling method based on the Navier-Stokes equation. Tables 1 and 2 show the maximum displacement, maximum Mises stress, and corresponding protection efficiency of the gate's main components at different protection thicknesses.

[0098] Table 1 Maximum displacement of gate main components and displacement protection efficiency under different protection thicknesses

[0099]

[0100] Note: Displacement protection efficiency = (displacement without protection - displacement with protection) / static displacement × 100%;

[0101] Table 2 Maximum Mises stress and stress protection efficiency of gate main components under different protection thicknesses

[0102]

[0103] Note: Stress protection efficiency = (Mises stress without protection - Mises stress with protection) / static Mises stress × 100%.

[0104] like Figure 4 As shown in the figure, the gate protection thickness is positively correlated with the displacement and stress protection efficiency. The installation of protective devices can effectively reduce the impact of landslide surges on the gate.

[0105] In order to reduce the impact of landslide surges and at the same time reduce the impact of the protective device on the gate during normal opening and closing, a protective thickness of 10 cm is selected as the protection solution of this embodiment in this application embodiment.

[0106] The technical means disclosed in the present application are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. The above disclosure of the present application is based on preferred embodiments, but it is not intended to limit the present application. Any technical solution obtained by equivalent substitution or equivalent transformation falls within the scope of protection of the present application.

Claims

1. A gate protection method for reducing landslide surge, characterized in that: include: The protective device is fixed to the front of the gate panel through a connector to reduce landslide surges; wherein the protective device includes a foam aluminum filler and a carbon fiber frame; the foam aluminum filler is filled in the carbon fiber frame to form the protective device, wherein the carbon fiber frame is a square hollow structure, and the width and height are determined according to the gate panel; The method for determining the thickness of the protective device includes: Step S1, obtaining a time history curve of the water level change in front of the dam; Step S2, calculating the static response of each gate component at a normal water level; the static response includes static displacement and static Mises stress; wherein the gate components include the face plate, main crossbeam web, vertical beam web, side beam web, and the gate as a whole; Step S3, based on the time history curve of the water level change in front of the dam, the fluid-solid coupling method of the Navier-Stokes equation is used to calculate the dynamic response of each gate component under the action of the landslide surge when there is no protective device and at different protection thicknesses; the dynamic response of each gate component when there is no protective device includes the unprotected displacement and the unprotected Mises stress, and the dynamic response of each gate component at different protection thicknesses includes the protected displacement and the protected Mises stress corresponding to the protection thickness; Step S4, calculating the protection efficiency after installing a protection device of corresponding thickness based on the static response and the dynamic response of each gate component under the action of landslide surge at different protection thicknesses when there is no protection device; wherein the protection efficiency includes displacement protection efficiency and stress protection efficiency; Step S5: determining the thickness of the protective device according to the protective efficiency.

2. The gate protection method according to claim 1, characterized in that: After step S5, the method further includes: determining the thickness of the foam aluminum filler according to the determined thickness of the protective device and the thickness of the carbon fiber frame.

3. The gate protection method according to claim 1, characterized in that: The obtaining of the time history curve of the water level change in front of the dam includes: The landslide surge in the reservoir area was simulated using the numerical simulation method of computational fluid dynamics-discrete element method-immersed boundary method CFD-DEM-IBM, and the time history curve of the water level change in front of the dam was obtained.

4. The gate protection method according to claim 1, characterized in that: In step S2, the hydrostatic pressure head of the gate is 62 m at the normal water level.

5. The gate protection method according to claim 1, characterized in that: Calculate the static response of each gate component at normal water level, including: Based on the gate's deadweight and the hydrostatic pressure at normal water level, the static response of each gate component is calculated using finite element static analysis. The static analysis equation of the gate structure is: ; in, is the overall stiffness matrix in the global coordinate system; is the displacement array in the global coordinate system; is the load matrix in the global coordinate system; The displacement components are obtained by solving the static analysis equation of the gate structure; Substituting the displacement components into the plane stress and bending stress calculation equations, the static displacement and static Mises stress of each gate component in the corresponding local coordinate system are obtained.

6. The gate protection method according to claim 1, characterized in that: Step S3 includes: An initial water head is set in the water body in front of the gate. Based on the time history curve of the water level change in front of the dam, the interaction between fluid and solid in the reservoir water-protection-gate fluid-solid coupling model is considered. The fluid-solid coupling method of the Navier-Stokes equation is used to calculate the dynamic response of each gate component under the action of landslide surge when there is no protection device and at different protection thicknesses. The reservoir water-protection-gate fluid-solid coupling model includes the protection device being fixed to the front of the gate panel through a connector to reduce the landslide surge of the reservoir water.

7. The gate protection method according to claim 1, characterized in that: In step S4, the protection efficiency after installing the protection device of the corresponding thickness is calculated based on the static response and the dynamic response of each gate component under the action of landslide surge at different protection thicknesses when there is no protection device, including: Displacement protection efficiency = (displacement without protection - displacement with protection) / static displacement × 100%; Stress protection efficiency = (Mises stress without protection - Mises stress with protection) / static Mises stress × 100%.

8. The gate protection method according to claim 1, characterized in that: The material of the foam aluminum filler is foam aluminum, and the foam aluminum material density is 450 kg / m³, the elastic modulus is 0.27 GPa, and the Poisson's ratio is 0.

32.

9. The gate protection method according to claim 1, characterized in that: The carbon fiber frame is made of carbon fiber, and the carbon fiber material density is 1800 kg / m³, the elastic modulus is 12.9 GPa, and the Poisson's ratio is 0.

3.

10. The gate protection method according to any one of claims 1 to 9, characterized in that: The foam aluminum filler is used for buffering and absorbing energy; the carbon fiber frame is used for reducing the deformation of the foam aluminum filler under hydrostatic pressure, thereby ensuring that the foam aluminum filler plays a role in buffering and absorbing energy.

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