A hybrid lattice structure with impact resistance and vibration suppression

Abstract

A mixed lattice structure that is impact-resistant and vibration-suppressing, relates to the field of spatial structure technology. In order to solve the problem that the existing lattice structure cannot simultaneously possess strong impact resistance and vibration suppression performance. The present invention includes an outer truss structure, a cylindrical inner core and a body-centered truss structure. The body-centered truss structure, the cylindrical inner core and the outer truss structure are arranged in sequence from the inside to the outside and connected in sequence to form a regular mixed lattice structure. The body-centered truss structure is formed by connecting a plurality of core rods, and one end of the plurality of core rods is connected to one point to form a central connection node. The central connection node is at the center of the outer truss structure, and the other ends of the plurality of core rods extend to each connection node of the outer truss structure and are connected to the inner wall of the cylindrical inner core. The present invention is mainly used to form a spatial lattice structure.

Description

Technical Field

[0001] The present invention relates to the technical field of spatial structures, and in particular to a hybrid lattice structure capable of resisting impact and suppressing vibration. Background Art

[0002] In fields such as aerospace, transportation, and mechanical engineering, equipment and structures are often subject to the dynamic mechanical properties of shock and vibration. Shock can cause instantaneous damage to equipment, while structural vibration can cause fatigue damage and reduce precision, significantly impacting the reliability, safety, and service life of the structure. Traditional solid structures often suffer from heavy weight, poor energy absorption, and insufficient damping capabilities when dealing with shock and vibration. In recent years, lattice structures have gradually become a research hotspot due to their lightweight, high specific strength and stiffness, and excellent energy absorption and vibration reduction properties.

[0003] However, existing impact and vibration suppression devices typically have limited functionality, and their combined performance in both areas remains to be improved. For example, some lattice structures offer excellent impact resistance but poor vibration suppression, while others may offer good vibration suppression but insufficient impact resistance. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a hybrid lattice structure with impact resistance and vibration suppression. The hybrid lattice structure is formed by connecting periodic rod-shaped and cylindrical structures to form a hybrid lattice structure with impact resistance and vibration suppression performance.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A hybrid lattice structure for impact resistance and vibration suppression comprises an outer truss structure, a tubular inner core and a body-centered truss structure. The body-centered truss structure, the tubular inner core and the outer truss structure are arranged and connected in sequence from the inside to the outside to form a regular hybrid lattice structure.

[0007] Preferably, the body-centered truss structure is formed by connecting multiple core rods, one ends of the multiple core rods are connected to one point to form a central connection node, the central connection node is located at the center of the outer truss structure, and the other ends of the multiple core rods extend to each connection node of the outer truss structure and are connected to the inner wall of the cylindrical inner core.

[0008] Preferably, the outer truss structure is a cubic outer frame.

[0009] Preferably, the cylindrical inner core is a cylindrical structure with a square cross-section.

[0010] Preferably, the cylindrical inner core is a cylindrical structure with a circular cross-section.

[0011] Preferably, the cylindrical inner core is a cylindrical structure with a regular octagonal cross section.

[0012] Preferably, the mixed lattice structure is obtained by 3D printing.

[0013] The beneficial effects of the present invention compared with the prior art are:

[0014] Each lattice structure of the present invention is composed of an outer truss structure, a body-centered truss structure, and a surface-type cylindrical structure connecting the two. It is a hybrid lattice structure, wherein the cylindrical inner core supports the outer truss structure, and the body-centered truss structure supports the cylindrical inner core. Therefore, the hybrid lattice structure has a strong impact resistance. In addition, based on the principle of local resonance, this hybrid lattice structure can effectively reduce the vibration transmission in certain frequency bands. Therefore, the spatial lattice structure formed by this lattice structure array has the characteristics of impact resistance, energy absorption, vibration reduction and isolation. And the structure has the advantages of small size, light weight, and good scalability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are incorporated in and constitute a part of this application and are used to provide a further understanding of the present invention.

[0016] Figure 1 Schematic diagram of the structure of the lattice structure of Example 1.

[0017] Figure 2 This is a top view of the lattice structure of Example 1.

[0018] Figure 3 Schematic diagram of the structure of the lattice structure of Example 2.

[0019] Figure 4 This is a top view of the lattice structure of Example 2.

[0020] Figure 5 Schematic diagram of the structure of the lattice structure of Example 3.

[0021] Figure 6 This is a top view of the lattice structure of Example 3.

[0022] Figure 7 This is a structural diagram of a spatial lattice structure formed by the lattice structure array of Example 1.

[0023] Figure 8 This is a structural diagram of a spatial lattice structure formed by the lattice structure array of Example 2.

[0024] Figure 9 This is a structural diagram of a spatial lattice structure formed by the lattice structure array of Example 3.

[0025] Figure 101 is the energy band diagram of the lattice structure of Example 1 obtained by finite element calculation.

[0026] Figure 11 This is the energy band diagram of the lattice structure of Example 2 obtained by finite element calculation.

[0027] Figure 12 This is the energy band diagram of the lattice structure of Example 3 obtained by finite element calculation.

[0028] Figure 13 3 is a frequency response curve obtained by finite element analysis of a spatial lattice structure formed by the lattice structure array of Example 1.

[0029] Figure 14 is the vibration mode of the upper edge of the lattice structure energy band of Example 1, where (a) is Figure 10 The vibration mode of point C on the upper edge of the middle energy band, (b) is Figure 10 Vibration mode of point D on the upper edge of the middle energy band.

[0030] Figure 15 is the vibration mode of the lower edge of the lattice structure energy band of Example 1, where (a) is Figure 10 The vibration mode of point A at the lower edge of the middle energy band (b) is Figure 10 Vibration mode of point B at the lower edge of the middle energy band.

[0031] Figure 16 This is the acceleration time response curve obtained through experiments for the lattice structure of Example 1.

[0032] Figure 17 This is the acceleration time response curve obtained through experiments for the lattice structure of Example 2.

[0033] Figure 18 This is the acceleration time response curve obtained through experiments for the lattice structure of Example 3.

[0034] Explanation of the accompanying drawings: 1-external truss structure; 2-cylindrical inner core; 3-body-centered truss structure. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0036] See also Figures 1 to 6An embodiment of the present application provides a mixed lattice structure for impact resistance and vibration suppression, including an outer truss structure 1, a cylindrical inner core 2 and a body-centered truss structure 3. The body-centered truss structure 3, the cylindrical inner core 2 and the outer truss structure 1 are arranged and connected in sequence from the inside to the outside, that is, the cylindrical inner core 2 is arranged in the outer truss structure 1 and connected to the outer truss structure 1 to support the outer truss structure 1; the body-centered truss structure 3 is arranged in the cylindrical inner core 2 and connected to the cylindrical inner core 2 to support the cylindrical inner core 2, finally forming a regular mixed lattice structure.

[0037] Among them, combined Figures 1 to 6 The outer truss structure 1 is a regular polyhedron truss structure or a regular truss structure composed of multiple core rods, preferably a cubic frame to facilitate the connection of the lattice structure.

[0038] Among them, combined Figure 2 、 Figure 4 and Figure 6 The body-centered truss structure 3 is formed by connecting multiple core rods, one end of which is connected to one point to form a central connection node. The central connection node is located at the center of the outer truss structure 1. The other ends of the multiple core rods extend to each connection node of the outer truss structure 1 and are connected to the inner wall of the cylindrical inner core 2.

[0039] In addition, the present application provides three different structural forms of cylindrical inner cores 2. Based on the three cylindrical inner cores 2, three embodiments of lattice structures are given, and the vibration reduction performance of each lattice structure is evaluated in conjunction with the accompanying drawings.

[0040] Example 1: Figure 1 and Figure 2 The figure shows a first type of lattice structure of a square cylindrical inner core. The cylindrical inner core 2 is a cylindrical structure with a square cross-section. The outer truss structure 1 is a cubic outer frame formed by twelve core rods connected together. The square cylindrical inner core 2 is arranged within the cubic outer frame. The four corners of the upper end of the square cylindrical inner core 2 are connected to the four core rods in the upper layer of the cubic outer frame, and the four corners of the lower end of the square cylindrical inner core 2 are connected to the four core rods in the lower layer of the cubic outer frame to support the cubic outer frame. The body-centered truss structure 3 is formed by connecting eight core rods and arranged in the square cylindrical inner core 2. One ends of the eight core rods are connected to one point to form a central connection node. The central connection node is located at the center of the cube outer frame. The other ends of the eight core rods extend to the eight connection nodes of the cube outer frame respectively and are connected to the inner wall of the square cylindrical inner core 2 to support the square cylindrical inner core 2; the cube outer frame, the square cylindrical inner core 2 and the body-centered truss structure 3 form a square lattice structure as a whole. Figure 7It is a space lattice structure formed by the array of the first lattice structure. Since the band gap characteristics of the lattice structure can be obtained by finite element calculation, such as Figure 10 As shown in the figure, the energy band diagram of the lattice structure of the square cylindrical inner core 2 is obtained by finite element calculation (the gray part is the band gap). The gray area indicates that the structure has a band gap, and the elastic wave in this frequency range will be suppressed in the structure. Figure 13 As shown in the figure, near the frequency of the band gap in the energy band diagram, the frequency response curve shows obvious transmission peaks and valleys, indicating that the structure has a vibration isolation effect. Figure 16 As shown in the figure, it is the acceleration response curve of the lattice structure of the square cylindrical inner core 2. Figure 7 The specimen is subjected to frequency sweep and the acceleration response curve is obtained. Figure 16 It can be clearly seen that the output acceleration response is at least 1 / 2 lower than the acceleration response value of the input end, which intuitively reflects that the lattice structure of the square cylindrical inner core 2 has a better vibration reduction effect.

[0041] Example 2: Figure 3 and Figure 4 The figure shows a second type of lattice structure with a circular cylindrical core. The cylindrical core 2 is a cylindrical structure with a circular cross-section. The outer truss structure 1 is a cubic outer frame formed by connecting twelve core rods. The circular cylindrical core 2 is arranged within the cubic outer frame. The edge of the upper end of the circular cylindrical core 2 is connected to the four core rods on the upper layer of the cubic outer frame, and the edge of the lower end of the circular cylindrical core 2 is connected to the four core rods on the lower layer of the cubic outer frame to support the cubic outer frame. The body-centered truss structure 3 is formed by connecting eight core rods and arranged within the square cylindrical core 2. One end of the eight core rods is connected to a point to form a central connection node. The central connection node is located at the center of the cubic outer frame. The other ends of the eight core rods extend to the eight connection nodes of the cubic outer frame and connect to the inner wall of the circular cylindrical core 2 to support the circular cylindrical core 2. The cubic outer frame, the circular cylindrical core 2, and the body-centered truss structure 3 form a square lattice structure. Figure 8 It is a space lattice structure formed by the second lattice structure. Figure 11 As shown in the figure, the energy band diagram of the lattice structure of the circular cylindrical inner core 2 is obtained by finite element calculation (the gray part is the band gap). The gray area indicates that the structure produces a band gap, and the propagation of elastic waves within this frequency range in the structure will be suppressed. However, the band gap width of the lattice structure of the circular cylindrical inner core 2 is slightly smaller than the band gap width of the lattice structure of the square cylindrical inner core 2, indicating that the vibration damping characteristics of the lattice structure of the circular cylindrical inner core 2 are slightly smaller than those of the lattice structure of the square cylindrical inner core 2. Figure 17 As shown in the figure, it is the acceleration response curve of the lattice structure of the circular cylindrical inner core 2. Figure 8The specimen is subjected to frequency sweep and the acceleration response curve is obtained. Figure 17 It can be clearly seen that the output acceleration response is at least 1 / 2 lower than the acceleration response value of the input end, which intuitively reflects that the lattice structure of the circular cylindrical inner core 2 has a better vibration reduction effect.

[0042] Example 3: Figure 5 and Figure 6 The figure shows a third type of lattice structure of a regular octagonal cylindrical inner core. The cylindrical inner core 2 is a cylindrical structure with a regular octagonal cross-section. The outer truss structure 1 is a cubic outer frame formed by twelve core rods connected together. The regular octagonal cylindrical inner core 2 is arranged within the cubic outer frame. The eight corners of the upper end of the regular octagonal cylindrical inner core 2 are connected to the four core rods in the upper layer of the cubic outer frame, and the eight corners of the lower end of the regular octagonal cylindrical inner core 2 are connected to the four core rods in the lower layer of the cubic outer frame to support the cubic outer frame. The body-centered truss structure 3 is formed by connecting eight core rods and arranged in the regular octagonal cylindrical inner core 2. One end of the eight core rods is connected to one point to form a central connection node. The central connection node is located at the center of the cube outer frame. The other ends of the eight core rods extend to the eight connection nodes of the cube outer frame respectively and are connected to the inner wall of the regular octagonal cylindrical inner core 2 to support the regular octagonal cylindrical inner core 2; the cube outer frame, the regular octagonal cylindrical inner core 2 and the body-centered truss structure 3 form a square lattice structure as a whole. Figure 9 It is a space lattice structure formed by the third lattice structure. Figure 12 As shown in the figure, it is an energy band diagram of the lattice structure of the regular octagonal cylindrical inner core 2 obtained by finite element calculation (the gray part is the band gap). The gray area indicates that the structure produces a band gap, and the propagation of elastic waves within this frequency range in the structure will be suppressed. However, the band gap width of the lattice structure of the regular octagonal cylindrical inner core 2 is smaller than the band gap width of the lattice structure of the circular cylindrical inner core 2, indicating that the vibration damping characteristics of the lattice structure of the regular octagonal cylindrical inner core 2 are smaller than the lattice structures of the square cylindrical inner core 2 and the lattice structures of the circular cylindrical inner core 2. Figure 18 As shown in the figure, it is the acceleration response curve of the lattice structure of the regular octagonal cylindrical inner core 2. Figure 9 The specimen is subjected to frequency sweep and the acceleration response curve is obtained. Figure 18 It can be clearly seen that the acceleration response of the output is basically the same as the acceleration response value of the input end, which shows that the vibration reduction effect of the lattice structure of the regular octagonal cylindrical inner core 2 is not as good as the lattice structure of the circular cylindrical inner core 2 and the lattice structure of the square cylindrical inner core 2.

[0043] The lattice constant of the above three square lattice structures is 12 mm. The structural material is thermoplastic polyurethane elastomer rubber with an elastic modulus of 27.05 MPa, a Poisson's ratio of 0.4, and a density of 1100 kg / m3 , the radius of the core rod is 1mm, the thickness of the cylinder wall is 1mm, Figures 7 to 9 In the figure, solid blocks of the same material are applied on both sides of the lattice structure of the spatial array, with a thickness of 10 mm.

[0044] In this embodiment, each lattice structure is composed of an outer truss structure 1, a body-centered truss structure 3, and a surface-shaped cylindrical structure connecting the two; that is, each lattice structure contains both a rod-shaped structure and a surface-shaped cylindrical structure, which is a mixed lattice structure. Among them, the cylindrical inner core 2 supports the outer truss structure 1, and the body-centered truss structure supports the cylindrical inner core 2. Therefore, the mixed lattice structure of this embodiment has a greater ability to resist loads and strong impact resistance under the action of compressive loads. Figure 10 、 Figure 14 and Figure 15 When the hybrid lattice structure is vibrated, based on the principle of local resonance, the lower edge of the energy band (such as Figure 10 The vibration modes of A and B in the figure are mainly manifested as different degrees of bending deformation along the length direction of the core rod of the outer truss structure 1, such as Figure 14 At the upper edge of the energy band (as shown in (a) and (b) Figure 10 C and D in the figure), its vibration mode is mainly manifested as torsional deformation in all directions along the core rod of the outer truss structure 1, such as Figure 15 As shown in (a) and (b). These vibration modes show typical local resonance characteristics, which enable the lightweight structure to absorb a large amount of external energy, thereby opening the band gap and avoiding the disadvantage of increasing the mass of the lattice structure to improve the vibration reduction performance. Therefore, the lattice structure of this embodiment can achieve the purpose of small volume and lightweight through a hybrid design method, while also significantly improving its strength, vibration reduction and energy absorption, and impact resistance. The spatial lattice structure arrayed with this lattice structure also has the characteristics of impact resistance, energy absorption, vibration reduction and isolation, and can achieve high-performance protection of the structure under complex dynamic loads.

[0045] See also Figures 7 to 9 This embodiment also provides a hybrid spatial lattice structure for shock resistance and vibration suppression. The hybrid spatial lattice structure comprises multiple lattice structures and two square blocks, with the multiple lattice structures arranged in an array between the two square blocks. The hybrid spatial lattice structure is obtained by 3D printing, forming an integrated spatial lattice structure, thereby further enhancing the hybrid spatial lattice structure's shock resistance and vibration suppression performance.

[0046] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

Claims

1. A hybrid lattice structure for shock resistance and vibration suppression, characterized by: It includes an outer truss structure, a cylindrical inner core and a body-centered truss structure, wherein the body-centered truss structure, the cylindrical inner core and the outer truss structure are arranged and connected in sequence from the inside to the outside to form a regular mixed lattice structure; The body-centered truss structure is formed by connecting multiple core rods, one end of each of the core rods is connected to a point to form a central connection node, and the central connection node is located at the center of the outer truss structure. The other ends of the core rods extend to each connection node of the outer truss structure and are connected to the inner wall of the cylindrical inner core. The outer truss structure is a cubic outer frame formed by connecting twelve core rods; The cylindrical inner core is a cylindrical structure with a square cross section, a circular cylindrical structure or a regular octagonal cylindrical structure.

2. The hybrid lattice structure for shock resistance and vibration suppression according to claim 1, characterized in that: The mixed lattice structure is obtained by 3D printing.

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