Hierarchical multi-cell circular tube structure
By combining hierarchical design with rice straw cross-sectional structure design, the problem of poor energy absorption performance of thin-walled tube structures is solved, achieving more efficient energy absorption and deformation stability, and improving vehicle collision safety.
Patent Information
- Application Number
- CN202520153827.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-01-23
AI Technical Summary
Existing thin-walled tube structures have poor energy absorption performance in car collisions, making it difficult to meet the collision safety requirements of modern vehicles.
By adopting the hierarchical design theory, the cross-sectional structure of rice straw is combined with multi-cell circular tubes to design a hierarchical multi-cell circular tube structure. The cells are connected by triangular structures to form hierarchical structural units, which enhances deformation stability and energy absorption performance.
It improves the energy absorption performance of multi-cell circular tube structures, has good deformation stability, small platform force fluctuation amplitude, and can effectively protect passenger safety. The energy absorption performance increases with the increase of the floor level.
Smart Images
Figure CN223578648U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of automobile passive safety protection technology, especially relates to a hierarchical polyhedral circular tube structure. BACKGROUND
[0002] With the development of automobile industry and the improvement of national living standards, the automobile ownership of our country increases rapidly. When the automobile collides, the energy absorption structure absorbs energy through its own structure crushing deformation, converts the kinetic energy into internal energy of the structure, and uniformly transmits the collision force to the two front longitudinal beams, which plays a very important role in protecting the vehicle body structure and reducing the injury of passengers. The load capacity of the energy absorption structure greatly affects the crashworthiness of the automobile. Therefore, designing a lightweight and high crashworthiness energy absorption structure is of great significance to improve the passive safety of the automobile.
[0003] Thin-walled tube structure is widely used in vehicles, high-speed rail, aircraft and other transportation tools in the transportation field due to its high strength, light weight, low cost and good energy absorption effect. However, the traditional thin-walled tube has a single shape and structure, which leads to the fact that its energy absorption characteristics cannot meet the demand of modern transportation tools for collision safety.
[0004] The hierarchical topology structure has excellent strength and impact resistance. The hierarchical concept is used to design the traditional thin-walled tube structure, which provides a good reference for the design of automobile energy absorption structure and has great innovation value. CONTENT OF THE UTILITY MODEL
[0005] In view of the problem that the existing polyhedral circular tube structure has poor energy absorption performance, the utility model provides a hierarchical polyhedral circular tube structure. The utility model combines the hierarchical design theory and the crashworthiness structure design method, selects the rice stem cross section structure as the biological prototype of the polyhedral tube optimization design through similarity analysis. According to the similarity of the rice stem cross section structure and the polyhedral circular tube in structure and function, the triangular structure is combined with the polyhedral circular tube, so as to design a new type of hierarchical polyhedral circular tube structure with good crashworthiness, which enhances the deformation stability of the polyhedral circular tube structure and greatly improves the energy absorption performance of the polyhedral circular tube structure.
[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0007] A hierarchical polyhedral circular tube structure, characterized in that it comprises a polyhedral circular tube and a hierarchical structure unit, the polyhedral circular tube is composed of four partitions and a circular tube, forming a polyhedral circular tube with four cells; the hierarchical structure unit is composed of a triangular structure, and a triangle is formed by connecting the midpoints of each cell corresponding edge or corresponding arc, and the hierarchical structure unit is formed in this way; the hierarchical structure units are uniformly distributed in each cell, and the triangles of adjacent cells are connected to each other.
[0008] Preferably, the four partitions are evenly distributed in the circular tube.
[0009] Preferably, the geometric size of the hierarchical unit gradually decreases with the increase of the order.
[0010] Preferably, the edge length of the triangular structure corresponding to each cell is the same.
[0011] Preferably, the angle of the triangular structure corresponding to each cell is the same.
[0012] Preferably, the wall thickness of the partition and the circular tube is the same as the wall thickness of the triangular structure.
[0013] Preferably, the material of the hierarchical multi-cell circular tube structure is metal.
[0014] Preferably, the hierarchical multi-cell circular tube structure can be prepared by wire cutting or 3D printing technology.
[0015] Preferably, the bottom of the hierarchical multi-cell circular tube structure is fixed to the front longitudinal beam, and the top of the hierarchical multi-cell circular tube structure receives the impact of the collision resistance.
[0016] The beneficial effects of the utility model lie in:
[0017] 1. The hierarchical multi-cell circular tube structure is novel in design, simple in structure, convenient to process, and suitable for batch production requirements.
[0018] 2. The hierarchical multi-cell circular tube structure is based on the structure of the rice stem section.
[0019] 3. The hierarchical multi-cell circular tube structure deforms stably during the collision compression process, the platform force fluctuation amplitude is small, the collision force can be well absorbed, and the safety of passengers and drivers is protected.
[0020] 4. The hierarchical multi-cell circular tube structure can increase energy absorption with the increase of hierarchical order under the condition of keeping the structure quality unchanged, which shows the excellent energy absorption performance of the hierarchical multi-cell circular tube structure. DRAWINGS
[0021] Figure 1 The utility model discloses a multi-cell circular tube structure schematic diagram, wherein, Figure 1 a is the multi-cell circular tube structure perspective view, Figure 1 b is the multi-cell circular tube structure section view.
[0022] Figure 2 The utility model discloses a one-order hierarchical multi-cell circular tube structure schematic diagram, wherein, Figure 2 a is the one-order hierarchical multi-cell circular tube structure perspective view, Figure 2b is a cross-sectional view of a first-level hierarchical multi-cell circular tube structure;
[0023] Figure 3 This is a schematic diagram of the two-tiered multi-celled circular tube structure of this utility model, wherein, Figure 3 a is a three-dimensional diagram of a two-level hierarchical multicellular circular tube structure. Figure 3 b is a cross-sectional view of a two-tiered multicellular circular tube structure;
[0024] Figure 4 This is a schematic diagram of the three-tiered multi-celled circular tube structure of this utility model, wherein, Figure 4 a is a three-dimensional diagram of a three-tiered multicellular cylindrical structure. Figure 4 b is a cross-sectional view of a three-tiered multi-cell circular tube structure;
[0025] Figure 5 This is a deformed diagram of the hierarchical multi-cell circular tube structure in this utility model;
[0026] Figure 6 This is a force-displacement curve diagram of the hierarchical multi-cell circular tube structure in this utility model. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0028] Example 1
[0029] like Figures 1 to 4 As shown, a hierarchical multi-cell circular tube structure includes a multi-cell circular tube and hierarchical structural units. The multi-cell circular tube consists of four partitions and a circular tube, forming a multi-cell circular tube with four cells. The hierarchical structural units are composed of triangular structures, which are formed by connecting the midpoints of corresponding sides or corresponding arcs of each cell, and so on to form hierarchical structural units. The hierarchical structural units are evenly distributed in each cell, and the triangles of adjacent cells are connected to each other.
[0030] All the multi-celled circular tube structures involved in this utility model have an outer diameter of 150mm, a height of 220mm, and a mass of 279.92g. While maintaining a constant mass, the wall thickness of the structure varies with the level of the multi-celled circular tube. The wall thicknesses of the first-level, second-level, and third-level multi-celled circular tube structures are 0.611mm, 0.331mm, 0.2mm, and 0.127mm, respectively.
[0031] like Figure 1 As shown, the multi-celled circular tube is composed of four partitions 1 and one circular tube 2, forming a multi-celled circular tube with four cells.
[0032] Example 2
[0033] like Figure 2 The first-level hierarchical multi-cell circular tube structure shown is based on the multi-cell circular tube. By connecting the midpoints of the first first-order partition 11 and the second first-order partition 13 and the midpoint of the corresponding first-order arc 12 to form a triangle, a first-order triangular hierarchical structural unit is formed in the four cells, thus forming a first-level hierarchical multi-cell circular tube structure.
[0034] Example 3
[0035] like Figure 3 The two-level hierarchical multi-cell circular tube structure shown is based on the first-level hierarchical multi-cell circular tube structure. It forms a second-level triangular hierarchical structural unit by connecting the midpoints of the first second-level partition 21 and the second second-level partition 23 of each cell and the midpoint of the corresponding second-level arc 22, and finally constitutes a two-level hierarchical multi-cell circular tube structure.
[0036] Example 4
[0037] like Figure 4 The three-tiered multi-cell circular tube structure shown is based on the two-tiered multi-cell circular tube structure. It forms a three-tiered triangular hierarchical structural unit by connecting the midpoints of the first and second third-tier partitions 31 and the midpoints of the corresponding third-tier arcs 32 of each cell, and finally constitutes the three-tiered multi-cell circular tube structure.
[0038] Example 5: Numerical Calculation of a Hierarchical Multicellular Circular Tube Structure
[0039] The pipe wall material is made of aluminum alloy with Young's modulus E = 68 GPa, Poisson's ratio ν = 0.33, and density ρ = 2.7 × 10⁻⁶. -3 kg / m 3 Yield stress σ y =71.0MPa, ultimate stress σ u =130.7 MPa. Numerical calculations were performed using the ABAQUS / Explicit explicit dynamics module to establish a finite element model of the hierarchical multicell circular tube structure. The bottom end of the hierarchical multicell circular tube structure was fixed, and the indenter impacted the structure at a uniform velocity of 10 m / s. The indenter was meshed using discrete, four-node rigid quadrilateral elements (R3D4), and the hierarchical multicell circular tube structure was meshed using four-node shell elements (S4R), with a mesh size of 1.5 mm. The interaction between the indenter and the hierarchical multicell circular tube structure, as well as the self-contact of the hierarchical multicell circular tube structure, were set as universal contact, with the contact nature set as penalized contact and a friction coefficient of 0.2. The Isotropic material model was used to describe the physical properties of the hierarchical multicell circular tube structure. The deformation diagram of the hierarchical multicell circular tube structure is shown below. Figure 5As shown, with the increase of the order, the deformation of the hierarchical cellular circular tube structure is more progressive, and the number of folds is also increasing. The force-displacement curve of the hierarchical cellular circular tube structure is shown in Figure 6 As shown, with the increase of the order, the fluctuation amplitude of the curve gradually slows down, and the plateau force increases, which highlights the advantages of the hierarchical cellular circular tube structure in energy absorption characteristics.
[0040] Compared with the circular tube, the hierarchical cellular circular tube structure has more stable deformation, forms more fold units, and has better progressive deformation. The force-displacement curve of the hierarchical cellular circular tube structure has smaller fluctuation amplitude and larger plateau force. The specific energy absorption of the third-order hierarchical cellular circular tube structure is 1.9 times that of the circular tube.
[0041] Compared with the cellular circular tube, the hierarchical cellular circular tube structure forms more fold units, the number of folds increases with the increase of the hierarchical order, and the plateau force also increases with the increase of the order. The specific energy absorption of the third-order hierarchical cellular circular tube structure is 1.2 times that of the cellular circular tube.
[0042] Compared with other cellular structures, see Table 1, which compares the energy absorption characteristics of different cellular tube structures. In order to ensure fairness of comparison, the material parameters and mass of all cellular tubes are the same (279.92g), the wall thickness is different (see Table 1), the same loading speed, constraint condition and mesh division are adopted, and the energy absorption performance of all cellular tube structures in Table 1 is calculated. The results show that the hierarchical cellular circular tube structure in the utility model patent has better energy absorption characteristics.
[0043] Table 1 Comparison of energy absorption characteristics of different cellular tube structures
[0044]
[0045] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. The substitution can be a partial structure, device, method step substitution, or a complete technical solution. According to the technical solution and the utility model concept of the present application, equivalent substitution or change should be covered within the protection scope of the present application.
Claims
1. A hierarchical multi-cell circular tube structure, characterized in that, It includes a multi-celled circular tube and a hierarchical structural unit. The multi-celled circular tube is composed of four partitions and a circular tube, forming a multi-celled circular tube with four cells. The hierarchical structural unit is composed of a triangular structure. A triangle is formed by connecting the midpoints of the corresponding sides or arcs of each cell, and so on to form a hierarchical structural unit. The hierarchical structural units are evenly distributed in each cell, and the triangles of adjacent cells are connected to each other.
2. The hierarchical multi-cell circular tube structure according to claim 1, characterized in that: The four partitions are evenly distributed in the circular tube.
3. The hierarchical multi-cell circular tube structure according to claim 1, characterized in that: The geometric dimensions of hierarchical structural units gradually decrease as the order increases.
4. The hierarchical multi-cell circular tube structure according to claim 1, characterized in that: Each cell corresponds to a triangle structure with the same side length.
5. A hierarchical multi-cell circular tube structure according to claim 1, characterized in that: Each cell corresponds to a triangle structure with the same angle.
6. A hierarchical multi-cell circular tube structure according to claim 1, characterized in that: The wall thickness of the partition and the circular tube is the same as that of the triangular structure.
7. A hierarchical multi-cell circular tube structure according to claim 1, characterized in that: The material of the hierarchical multicellular cylindrical structure is metal.
8. A hierarchical multi-cell circular tube structure according to claim 1, characterized in that: The hierarchical multicellular cylindrical structure can be prepared by wire cutting or 3D printing technology.
9. A hierarchical multi-cell circular tube structure according to claim 1, characterized in that: The bottom of the multi-celled circular tube structure is fixed to the front longitudinal beam, while the top of the multi-celled circular tube structure is subjected to impact.