Chiral origami superstructure connecting pipe for vibration control

Abstract

The invention discloses a chiral paper folding superstructure connecting pipe for vibration control, and relates to the technical field of structural mechanics and vibration reduction performance of cylindrical shell type connecting pipes. The invention aims to solve the problem that the existing chiral superstructure cannot meet the vibration reduction requirements under different frequencies. The structure comprises a plurality of superstructure unit cells, the superstructure unit cells are sequentially arranged from top to bottom in the axial direction, every two adjacent superstructure unit cells are connected through a set of unit cell connecting rods, the superstructure unit cells comprise a plurality of unit cells arranged in the circumferential direction, the upper ends of the unit cells are twisted anticlockwise, and the lower ends of the unit cells are twisted anticlockwise. And the upper end inner blade angle of each unit cell is connected with the lower end inner blade angle of the adjacent unit cell through a unit cell connecting rod, and the upper end outer blade angle of each unit cell is connected with the lower end outer blade angle of the adjacent unit cell through a unit cell connecting rod. The method is used for superstructure vibration reduction design.

Description

Technical Field

[0001] The present invention relates to the technical field of structural mechanics and vibration damping performance of columnar shell nozzles, and specifically relates to a chiral origami superstructure nozzle for vibration control. Background Art

[0002] Chiral superstructures achieve mechanical properties that traditional materials do not possess, such as negative Poisson's ratio, negative refractive index, vibration damping band gaps, etc., through delicate microstructural designs, showing great potential in vibration control and wave management. Among many superstructure design schemes, chiral structures have attracted much attention due to their unique geometric characteristics. Chiral structures usually have rotational symmetry and specific geometric arrangements, and can exhibit the negative Poisson's ratio effect when loaded, which provides new possibilities for vibration control. Therefore, the research on vibration control based on chiral superstructures not only has theoretical significance but also has broad engineering application prospects. However, in existing structures, at the present stage, chiral superstructures cannot meet the vibration damping requirements at different frequencies. Summary of the Invention

[0003] In order to solve the problem that chiral superstructures at the present stage cannot meet the vibration damping requirements at different frequencies, the present invention further provides a chiral origami superstructure nozzle for vibration control.

[0004] The technical solution adopted by the present invention to solve the above technical problems is as follows:

[0005] A chiral origami superstructure nozzle for vibration control includes a plurality of superstructure unit cells, which are arranged in sequence from top to bottom along the axial direction. Each adjacent pair of superstructure unit cells is connected by a set of unit cell connecting rods. The superstructure unit cell includes a plurality of unit cells arranged along the circumferential direction. The upper end of the unit cell is twisted counterclockwise. The inner leaf angles at the upper ends of each unit cell and the inner leaf angles at the lower ends of adjacent unit cells, and the outer leaf angles at the upper ends of each unit cell and the outer leaf angles at the lower ends of adjacent unit cells are respectively connected by unit cell connecting rods.

[0006] Further, between each adjacent pair of superstructure unit cells, the inner leaf angles at the upper ends and the inner leaf angles at the lower ends of the upper unit cell are respectively connected to the outer leaf angles at the lower ends of the adjacent unit cell in the axial direction below by unit cell connecting rods.

[0007] Further, the number of the superstructure unit cells is an even number, and the number of unit cells in each superstructure unit cell is an even number.

[0008] Further, the upper end of the unit cell is twisted by an angle α, and α = 24.08°.

[0009] Further, the upper inner lobe angle of the unit cell is β1, β1 = 85°, the upper outer lobe angle of the unit cell is β2, β2 = 80°, the lower outer lobe angle of the unit cell is β3, β3 = 34°, and the lower inner lobe angle of the unit cell is β4, β4 = 65°.

[0010] Further, the unit cell is a four-bar linkage structure. The unit cell includes an upper link, a lower link, an outer link, and an inner link. The outer end of the upper link is connected to the upper end of the outer link. The lower end of the outer link is connected to the outer end of the lower link. The inner end of the lower link is connected to the lower end of the inner link. The upper end of the inner link is connected to the inner end of the upper link.

[0011] Further, the widths of the upper link, the lower link, the outer link, and the inner link are all t, and t = 10.00 mm.

[0012] Further, the length of the upper link is a, a = 150.00 mm, the length of the lower link is b, b = 152.07 mm, the distance between the midpoints of the front edges of the upper link and the lower link is c, c = 547.32 mm, and the distance between the midpoints of the rear edges of the upper link and the lower link is e, e = 547.33 mm.

[0013] Further, the angle between the plane where the upper link is located and the plane where the lower link is located is θ, and θ = 20.00°.

[0014] Further, the length of the single-cell link is d, d = 343.93 mm, and the length of the unit-cell link is s, s = 111.80 mm.

[0015] The beneficial effects included in the present invention compared with the prior art are:

[0016] The present invention discloses a chiral origami superstructure nozzle for vibration control and bandgap regulation. The superstructure nozzle is a cylindrical chiral superstructure formed by artificially arranging six chiral oscillators composed of rods in a periodic manner. The chiral structure has rotational symmetry and a specific geometric arrangement. The superstructure has a double period, with four chiral oscillators arranged in the circumferential direction and six chiral oscillators in the axial direction. The chiral origami superstructure nozzle is mainly used in fields such as space, aviation, and machinery that require light weight and high strength, and can achieve good vibration reduction and provide effective vibration reduction flexibility. Compared with the traditional corrugated structure, the chiral origami superstructure has a more excellent vibration reduction effect, especially forming a significant bandgap in the low-frequency and mid-frequency ranges, verifying the advantages of chiral design for vibration control. This design method provides new possibilities for vibration reduction applications in specific frequency ranges, and can meet the vibration reduction requirements of different frequencies while having the advantages of low weight and high stiffness. Therefore, the chiral origami superstructure nozzle has high applicability.

[0017] The objective of the present invention is to explore its dynamic and bandgap characteristics, especially the application potential in vibration control. By establishing the dynamic model of this structure and combining finite element analysis and numerical simulation, the characteristics such as the natural modes, transmission loss, and bandgap distribution of this superstructure at different frequencies are studied. Meanwhile, special attention is paid to the influence of the twist angle of the chiral structure on the bandgap frequency range and width, with a view to achieving flexible control of the bandgap position by adjusting the twist angle. This design method provides new possibilities for vibration reduction applications in specific frequency ranges, and can meet the vibration reduction requirements at different frequencies while having the advantages of low weight and high stiffness, making it suitable for applications in fields such as space, aviation, and machinery that require light weight and high strength.

[0018] By designing the main structure of the columnar shell nozzle through a new configuration, the characteristics of this superstructure in terms of mechanics and vibration reduction performance can be regulated. The present invention proposes a chiral origami superstructure nozzle for vibration control. This new structure is a cylindrical chiral superstructure composed of rods, and mainly explores the characteristics of this superstructure in terms of mechanics and vibration reduction performance, especially its performance in vibration control and vibration reduction. Meanwhile, the present invention also systematically analyzes the key parameters such as the natural frequency, modal vibration mode, and transmission loss of this chiral origami superstructure by establishing the dynamic equation of this structure and combining finite element analysis and numerical simulation.

[0019] In the chiral origami superstructure nozzle for low-frequency vibration reduction of the present invention, multiple bandgap regions are formed in the chiral origami superstructure in the frequency range of 0 - 1500 Hz. In these frequency ranges, the vibration transmission is significantly suppressed, showing good vibration reduction performance.

[0020] The twist angle of the chiral oscillator in the present invention significantly affects the bandgap position and width of the chiral origami superstructure nozzle: increasing the twist angle will increase the flexibility of the structure, shift the bandgap to the low-frequency region, and thus broaden the vibration reduction bandgap in the middle and high frequencies. This design of controlling the bandgap position by adjusting the twist angle provides flexibility for achieving effective vibration reduction in a specific frequency range.

[0021] After comparing with the traditional corrugated structure, it is found that the chiral origami superstructure of the present invention exhibits more excellent vibration reduction effect, especially significant bandgaps are formed in the low-frequency and middle-frequency ranges, further verifying the advantages of chiral design for vibration control.

[0022] The chiral origami superstructure nozzle, rotating blade, and rod structure in the present invention are all periodic superstructure materials. From the axial connection method, it can be expected that this structure has the characteristics of a negative Poisson's ratio structure. While having vibration reduction performance, it also has a certain axial load-bearing capacity. Description of the Drawings

[0023] Figure 1It is a schematic structural diagram of a case where a unit cell in a chiral origami superstructure nozzle for vibration control according to the present invention is a rotating blade structure;

[0024] Figure 2 It is a structural schematic diagram of a unit cell in a chiral origami superstructure tube for vibration control described in the present invention when the unit cell is a simplified frame structure;

[0025] Figure 3 It is a structural schematic diagram of a case where a unit cell in a chiral origami superstructure tube for vibration control according to the present invention is a four-bar structure;

[0026] Figure 4 It is a schematic structural diagram of a superstructure unit cell in a chiral origami superstructure tube for vibration control according to the present invention;

[0027] Figure 5 It is a schematic diagram of the main structure of a chiral origami superstructure pipe for vibration control according to the present invention;

[0028] Figure 6 It is an axonometric diagram of a chiral origami superstructure nozzle for vibration control according to the present invention;

[0029] Figure 7 is a comparison chart of numerical and simulated transmission loss results of the chiral origami superstructure in the present invention;

[0030] Figure 8 is a comparison diagram of transmission loss results of the chiral origami superstructure and the bellows in the present invention;

[0031] Figure 9 is the stress-displacement curve of the chiral origami superstructure in the present invention;

[0032] Figure 10 is the axial-lateral deformation curve of the chiral origami superstructure in the present invention;

[0033] Figure 11 is the effect of the rotation angle of the chiral oscillator on the band gaps A, B and C in the present invention, wherein the rotation angles are 25° and 35° respectively;

[0034] Figure 12 It is the variation trend of the band gap A with the rotation angle of the chiral oscillator in the present invention;

[0035] Figure 13 It is the variation trend of the band gap B with the rotation angle of the chiral oscillator in the present invention;

[0036] Figure 14 It is the variation trend of the band gap C in the present invention along with the rotation angle of the chiral oscillator. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] Specific implementation method 1: Combination Figures 1 to 14 The present embodiment is described. The chiral origami superstructure tube for vibration control described in the present embodiment comprises a plurality of superstructure unit cells 1, wherein the plurality of superstructure unit cells 1 are arranged in sequence from top to bottom along the axial direction, and each two adjacent superstructure unit cells 1 are connected by a group of unit cell connecting rods 2. The superstructure unit cell 1 comprises a plurality of unit cells 3 arranged along the circumferential direction, and the upper ends of the unit cells 3 are twisted counterclockwise, and the upper inner lobe angle of each unit cell 3 and the lower inner lobe angle of the adjacent unit cell 3 and the upper outer lobe angle of each unit cell 3 and the lower outer lobe angle of the adjacent unit cell 3 are connected respectively by unit cell connecting rods 4.

[0039] Through sophisticated microstructure design, chiral superstructures achieve mechanical properties that traditional materials cannot have, such as negative Poisson's ratio, negative refractive index, and vibration-damping band gap, which makes them show great potential in vibration control and fluctuation management. Reasonable design of chiral structures can achieve vibration suppression within a specific frequency range. At the same time, it involves adjusting structural parameters without changing the overall shape to meet the vibration reduction requirements under different working conditions.

[0040] Chiral structures usually have rotational symmetry and specific geometric arrangements. The rotating blades also have the deformation characteristics of chiral structures, and can transform deformation into rotational deformation when subjected to axial force. Unit cells are arranged in the same plane and connected to form superstructure unit cells using rods with the same parameters. The unit cells are arranged vertically.

[0041] It can exhibit a negative Poisson's ratio effect when loaded. This property provides new possibilities for vibration control. By designing a reasonable chiral structure, vibration suppression within a specific frequency range can be achieved, making it have important application potential in the field of vibration reduction.

[0042] The structural design of the chiral superstructure can also adjust the structural parameters without changing the overall shape, thereby meeting the vibration reduction requirements under different working conditions.

[0043] The superstructure is a cylindrical chiral superstructure formed by artificially periodically arranging six chiral oscillators composed of rods, i.e., six superstructure unit cells 1. The chiral structure has rotational symmetry and a specific geometric arrangement. The superstructure has a double period, and four chiral oscillators, i.e., four unit cells 3, are arranged in the circumferential direction, and six chiral oscillators are arranged in the axial direction.

[0044] The shape of the described superstructure unit cell is similar to an origami structure. The unit cells form a spatial four-term chiral structure in the same layer, enhancing the vertical load-bearing performance while retaining the characteristic of contracting and deforming towards the center of the circle.

[0045] The described four-term chiral superstructure unit cell is an unstable chiral origami frame structure. When subjected to axial deformation, it will be transformed into torsional deformation by the chiral structure unit, so it does not satisfy the typical deformation characteristics of a truss. Considering the members in it as two-force members cannot accurately describe its deformation characteristics.

[0046] The typical deformation characteristics of a truss are as follows: The members in a truss mainly bear axial forces, either tensile or compressive forces. Therefore, the deformation is mainly axial elongation or shortening. The joints of a truss are the parts where the members are connected, and the deformation at the joints is relatively concentrated. The deformation of a truss has overall coordination, that is, the deformations of each member affect each other and jointly maintain the balance of the structure. In an ideal situation, the members of a truss mainly bear axial forces and have relatively small bending deformations. A truss is more sensitive to lateral loads such as wind loads and seismic loads. The deformation of a truss is closely related to the stiffness of the members. Temperature changes will cause thermal expansion and contraction deformation of the truss. These characteristics make it necessary to comprehensively consider various factors during the design and use of a truss to ensure the safety and stability of the structure.

[0047] The described superstructure nozzle has periodicity along the axial direction. The axial period is m, which is a double period. There are 4-term chiral superstructure unit cell structures arranged along the circumference of the pipeline, and this arrangement has the characteristic of a periodic structural bandgap. m = 6 to achieve a significant vibration reduction effect of the artificial periodic structure.

[0048] The described superstructure nozzle has the characteristics of a negative Poisson's ratio structure. A negative Poisson's ratio structure refers to a structure that exhibits deformation behavior opposite to that of conventional materials when subjected to tension or compression. Specifically, when the material is stretched, its transverse direction will expand; when compressed, its transverse direction will contract. While having vibration reduction performance, it also has a certain axial load-bearing capacity. It can improve the axial vibration reduction performance of a cylindrical structure and better meet the specific requirements of a reciprocating diaphragm pump for low-frequency vibration reduction. The hydraulic end of a reciprocating diaphragm pump is applied to a cylindrical shell nozzle.

[0049] The inner diameter of the described chiral origami superstructure nozzle for vibration control is d, where 8.55 mm ≤ d ≤ 8.85 mm, and the outer diameter is D, where 5.43 mm ≤ D - d ≤ 6.00 mm. It has the functions of connection, vibration reduction, and support.

[0050] Compared with the traditional corrugated structure, the chiral origami superstructure has a more excellent vibration reduction effect, especially forming a significant bandgap in the low-frequency and medium-frequency ranges, verifying the advantages of chiral design for vibration control.

[0051] The chiral origami superstructure in the chiral origami superstructure for low-frequency vibration reduction forms multiple band gap regions in the frequency range of 0-1500Hz. The vibration transmission is significantly suppressed in these frequency ranges, showing good vibration reduction performance.

[0052] Bandgap manipulation refers to the vibration distribution of the six-period chiral origami superstructure at different frequencies to illustrate the vibration transfer properties of the bandgap and passband.

[0053] The vibration distribution conditions at different frequencies include: a first vibration distribution at a frequency of 290 Hz, which is within the low frequency range; a second vibration distribution at a frequency of 750 Hz within the Bragg scattering band gap; and a vibration distribution at 1047 Hz within the passband range.

[0054] The vibration transfer properties are as follows: when calculating the transmission loss of the input and output of the structure, polylactic acid PLA is selected as the material, the sweep frequency range is selected as 0-1500Hz, the boundary is a free boundary condition, the bottom node is the excitation input end, and the top arbitrary node is the displacement response end.

[0055] The band gaps included in the band gap regulation are A, B and C. The change in the law of the band gap is that when the rotation angle of the chiral oscillator is increased, the width of the band gap in the medium and high frequencies can be regulated. On the contrary, when the rotation angle is reduced, the width of the low-frequency band gap will be increased. Structures with high flexibility are more likely to produce vibration reduction effects at medium and high frequencies. The rotation angle of the chiral oscillator has an impact on the band gap regulation. The rotation angles are 25° and 35° respectively. Increasing the rotation angle will increase the flexibility of the structure and shift the band gap to the low-frequency region, thereby widening the vibration reduction band gap in the medium and high frequencies.

[0056] Specific implementation method 2: Combination Figures 5 to 6 To illustrate this embodiment, in this embodiment, between every two adjacent superstructure unit cells 1, the upper inner lobe angle and the lower inner lobe angle of the upper unit cell 3 are connected to the lower outer lobe angle of the adjacent unit cell 3 in the axial direction respectively through a unit cell connecting rod 2.

[0057] The undisclosed technical features in this embodiment are the same as those in the first embodiment.

[0058] Specific implementation method three: Combination Figures 1 to 6 To illustrate this embodiment, the number of the superstructure unit cells 1 described in this embodiment is an even number, and the number of the unit cells 3 in each superstructure unit cell 1 is an even number.

[0059] The undisclosed technical features in this embodiment are the same as those in the first or second embodiment.

[0060] Specific implementation method four: Combination Figures 1 to 6 The present embodiment is described. The upper end twist angle of the unit cell 3 in the present embodiment is α, and α=24.08°.

[0061] The undisclosed technical features in this embodiment are the same as those in the first embodiment.

[0062] Specific implementation method five: Combination Figures 1 to 6 To illustrate this embodiment, the upper inner lobe angle of the unit cell 3 described in this embodiment is β1, β1=85°, the upper outer lobe angle of the unit cell 3 is β2, β2=80°, the lower outer lobe angle of the unit cell 3 is β3, β3=34°, and the lower inner lobe angle of the unit cell 3 is β4, β4=65°.

[0063] The undisclosed technical features in this embodiment are the same as those in the first embodiment.

[0064] Specific implementation method six: Combination Figures 1 to 6 To illustrate this embodiment, the unit cell 3 described in this embodiment is a four-bar structure, and the unit cell 3 includes an upper link, a lower link, an outer link and an inner link. The outer end of the upper link is connected to the upper end of the outer link, the lower end of the outer link is connected to the outer end of the lower link, the inner end of the lower link is connected to the lower end of the inner link, and the upper end of the inner link is connected to the inner end of the upper link.

[0065] The undisclosed technical features in this embodiment are the same as those in the first embodiment.

[0066] The blade structure of unit cell 3 rotation, such as Figure 1 As shown in the figure, it also has the deformation characteristics of chiral structure, and can transform the deformation into rotational deformation when subjected to axial force. For lightweight considerations, it is simplified to a frame structure, such as Figure 2 As shown in , this structure can maintain the original deformation characteristics, but for lightweight considerations, the rods are replaced by unit cells, such as Figure 3 As shown in the figure, the rods arranged in the same plane and connected with the same parameters form a superstructure unit cell. The unit cells are arranged vertically and the rods of the inner layer are connected to the outer layer of the next layer to obtain a chiral rod periodic superstructure material.

[0067] Specific implementation method seven: Combination Figures 1 to 6 To explain this embodiment, the widths of the upper connecting rod, the lower connecting rod, the outer connecting rod and the inner connecting rod in this embodiment are all t, where t=10.00 mm.

[0068] The undisclosed technical features in this embodiment are the same as those in the sixth embodiment.

[0069] Specific implementation method eight: Combination Figures 1 to 6Referring to this embodiment, the length of the upper link in this embodiment is a, where a = 150.00 mm, the length of the lower link is b, where b = 152.07 mm, the distance between the midpoints of the front edges of the upper and lower links is c, where c = 547.32 mm, and the distance between the midpoints of the rear edges of the upper and lower links is e, where e = 547.33 mm.

[0070] The technical features not disclosed in this embodiment are the same as those in Embodiment Six.

[0071] Embodiment Nine: Figures 1 to 6 Referring to this embodiment, the angle between the plane of the upper link and the plane of the lower link in this embodiment is θ, where θ = 20.00°.

[0072] The technical features not disclosed in this embodiment are the same as those in Embodiment Six.

[0073] Embodiment Ten: Figures 1 to 6 Referring to this embodiment, the length of the unit cell link 2 in this embodiment is d, where d = 343.93 mm, and the length of the unit cell link 4 is s, where s = 111.80 mm.

[0074] The technical features not disclosed in this embodiment are the same as those in Embodiment One.

[0075] Figure 1 For the unit cell 3 of the chiral origami superstructure nozzle for vibration control provided by the present invention, which is a rotating blade structure, the parameters used when establishing the mechanical model are: a = 150.00 mm, b = 152.08 mm, c = 547.32 mm, α = 24.08°, t = 10.00 mm.

[0076] Figure 2 For the unit cell 3 of the chiral origami superstructure nozzle for vibration control provided by the present invention, which is a simplified frame structure diagram, the parameters used in the calculation are: a = 150.00 mm, b = 152.08 mm, c = 547.32 mm, α = 24.08°, t = 10.00 mm.

[0077] Figure 3 For the unit cell 3 of the chiral origami superstructure nozzle for vibration control provided by the present invention, which is a bar structure diagram, the parameters used in the calculation are: a = 150.00 mm, b = 152.07 mm, c = 547.32 mm, e = 547.33 mm, the inclination angle α = 24.08°, θ = 20.00°, β1 = 85°, β2 = 80°, β3 = 34°, β4 = 65°.

[0078] Figure 4Schematic diagram of the supercell 1 of the chiral origami superstructure nozzle for vibration control provided by the present invention. The parameters used in the calculation are: a = 150.00 mm, b = 152.07 mm, c = 547.32 mm, e = 547.33 mm. Among them, the four line segments starting from the vertices of the 6 unit cells 3 are f = 323.36 mm, l = 236.56 mm, n = 343.93 mm, o = 294.49 mm. The above line segments are distributed counterclockwise along the axis, and the corresponding angles counterclockwise along the axis are α1 = 78.57°, α2 = 83.22°, α3 = 23.63°, α4 = 41.33°. The length s of the unit cell link 4 between two unit cells is 111.80 mm, and the included angles with the adjacent vertex line segments are The included angles with another vertex line segment are r1 = 70.66°, r2 = 77.01°, r3 = 103.71°, r4 = 69.96°, r5 = 70.66°.

[0079] Figure 5 Schematic diagram of the chiral origami superstructure nozzle for vibration control provided by the present invention. The parameters used in the calculation are: a = 150.00 mm, b = 152.07 mm, c = 547.32 mm, e = 547.33 mm, f = 323.36 mm, l = 236.56 mm, n = 343.93 mm, o = 294.49 mm, α1 = 78.57°, α2 = 83.22°, α3 = 23.63°, α4 = 41.33°, s = 111.80 mm, r1 = 70.66°, r2 = 77.01°, r3 = 103.71°, r4 = 69.96°, r5 = 70.66°. The length d of the unit cell link 2 between adjacent two layers of unit cells is 343.93 mm, and the included angles with the x, y, z axes are h1 = 66.93°, h2 = 7.87°, h3 = 11.811°.

[0080] The working principle of the bandgap regulation of the chiral origami superstructure nozzle for vibration control of the present invention includes:

[0081] The chiral origami superstructure forms multiple bandgap regions in the frequency range of 0 - 1500 Hz. In these frequency ranges, the vibration transmission is significantly suppressed, showing good vibration damping performance. Increasing the twist angle will increase the flexibility of the structure, shift the bandgap to the low-frequency region, and thus broaden the vibration damping bandgap in the medium and high frequencies.

[0082] The present invention utilizes the delicate microstructure design of chiral superstructures to achieve mechanical properties that traditional materials do not possess, such as negative Poisson's ratio, negative refractive index, vibration damping band gaps, etc., showing great potential in vibration control and wave management. Chiral structures usually have rotational symmetry and specific geometric arrangements, and can exhibit the negative Poisson's ratio effect when loaded. This property provides new possibilities for vibration control. By designing a reasonable chiral structure, vibration suppression in a specific frequency range can be achieved, making it have important application potential in the field of vibration damping. The structural design of chiral superstructures can also adjust the structural parameters without changing the overall shape, so as to meet the vibration damping requirements under different working conditions. It not only provides a new idea for the application of chiral origami superstructures in the low-frequency vibration damping of the hydraulic end of reciprocating diaphragm pumps, but also reveals the negative Poisson's ratio characteristics and multi-band vibration damping potential of this structure, providing an innovative and efficient reference solution for the requirements of vibration damping and wave control in engineering.

[0083] In the above specific implementation manners, the dynamics and band gap characteristics of the chiral origami superstructure will be explored, especially its application potential in vibration control. By establishing the dynamic model of this structure and combining finite element analysis and numerical simulation, the natural modes, transmission loss, and band gap distribution and other characteristics of this superstructure at different frequencies are studied.

[0084] In addition, the influence of the twist angle of the chiral structure on the band gap frequency range and width is studied, with the expectation of flexibly controlling the band gap position by adjusting the twist angle. This design method provides new possibilities for vibration damping applications in specific frequency ranges, and can have the advantages of low weight and high stiffness while meeting the vibration damping requirements at different frequencies.

[0085] To sum up, based on the simplification of chiral rotating blades, a new configuration design of the main structure of the cylindrical nozzle is carried out. The new structure is a cylindrical chiral superstructure composed of rods, and the characteristics of this superstructure in terms of mechanics and vibration damping performance are explored, especially its performance in vibration control and vibration damping.

[0086] By establishing the dynamic equation of this structure and combining finite element analysis and numerical simulation, systematic analysis of the key parameters such as the natural frequency, modal vibration mode, and transmission loss of this chiral origami superstructure is carried out. The band gap position and width are significantly affected by the twist angle of the chiral oscillator. This design of controlling the band gap position by adjusting the twist angle provides flexibility for achieving effective vibration damping in a specific frequency range.

[0087] After comparing with the traditional corrugated structure, it is found that the chiral origami superstructure shows more excellent vibration damping effect, especially forming significant band gaps in the low-frequency and mid-frequency ranges, further verifying the advantages of chiral design for vibration control. The consistency between the simulation results and the numerical solutions also proves the accuracy of this dynamic model, providing a reliable basis for subsequent optimization.

[0088] The take-over configuration of the present invention is not limited by the placement direction. As long as it is the working condition requiring axial pipeline vibration isolation and noise reduction, it can be satisfied, which has a certain universality.

[0089] The connection system of the take-over of the present invention does not limit the pipeline material, including but not limited to, resin materials, nylon materials, aluminum alloys and other materials that cannot be welded to steel. This connection system has a relatively firm connection effect while ensuring obvious sealing effect.

[0090] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A chiral origami superstructure nozzle for vibration control, characterized in that: It includes a plurality of superstructural unit cells (1), and the plurality of superstructural unit cells (1) are sequentially arranged from top to bottom in the axial direction. Each adjacent pair of superstructural unit cells (1) is connected by a set of unit cell connecting rods (2). The superstructural unit cell (1) includes a plurality of unit cells (3) arranged in the circumferential direction. The upper end of the unit cell (3) is twisted counterclockwise. Between the inner lobe angle of the upper end of each unit cell (3) and the inner lobe angle of the lower end of the adjacent unit cell (3) and between the outer lobe angle of the upper end of each unit cell (3) and the outer lobe angle of the lower end of the adjacent unit cell (3), they are respectively connected by unit cell connecting rods (4).

2. The chiral origami superstructure nozzle for vibration control according to claim 1, characterized in that: Between each adjacent pair of superstructural unit cells (1), the inner lobe angle of the upper end and the inner lobe angle of the lower end of the upper unit cell (3) are respectively connected to the outer lobe angle of the lower end of the adjacent unit cell (3) in the axial direction below by the unit cell connecting rods (2).

3. The chiral origami superstructure nozzle for vibration control according to claim 1 or 2, characterized in that: The number of the superstructural unit cells (1) is an even number, and the number of the unit cells (3) in each superstructural unit cell (1) is an even number.

4. A chiral origami superstructure nozzle for vibration control according to claim 1, characterized in that: The upper end of the unit cell (3) is twisted by an angle α, and α = 24.08°.

5. A chiral origami superstructure nozzle for vibration control according to claim 1, characterized in that: The inner lobe angle of the upper end of the unit cell (3) is β1, β1 = 85°, the outer lobe angle of the upper end of the unit cell (3) is β2, β2 = 80°, the outer lobe angle of the lower end of the unit cell (3) is β3, β3 = 34°, and the inner lobe angle of the lower end of the unit cell (3) is β4, β4 = 65°.

6. The chiral origami superstructure nozzle for vibration control according to claim 1, characterized in that: The unit cell (3) is a four-link structure. The unit cell (3) includes an upper link, a lower link, an outer link, and an inner link. The outer end of the upper link is connected to the upper end of the outer link. The lower end of the outer link is connected to the outer end of the lower link. The inner end of the lower link is connected to the lower end of the inner link. The upper end of the inner link is connected to the inner end of the upper link.

7. A chiral origami superstructure nozzle for vibration control according to claim 6, characterized in that: The widths of the upper link, the lower link, the outer link, and the inner link are all t, and t = 10.00 mm.

8. A chiral origami superstructure nozzle for vibration control according to claim 6, characterized in that: The length of the upper link is a, a = 150.00 mm, the length of the lower link is b, b = 152.07 mm. The distance between the middle of the front side edge of the upper link and the middle of the front side edge of the lower link is c, c = 547.32 mm. The distance between the middle of the rear side edge of the upper link and the middle of the rear side edge of the lower link is e, e = 547.33 mm.

9. A chiral origami superstructure nozzle for vibration control according to claim 6, characterized in that: The angle between the plane where the upper link is located and the plane where the lower link is located is θ, and θ = 20.00°.

10. A chiral origami superstructure nozzle for vibration control according to claim 1, characterized in that: The length of the unit cell connecting rod (2) is d, d = 343.93 mm, and the length of the unit cell connecting rod (4) is s, s = 111.80 mm.

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