Vibration reduction pipe clamp with metamaterial structure

Abstract

The invention relates to the field of vibration reduction devices, and particularly discloses a vibration reduction pipe clamp with a metamaterial structure, which comprises at least three annular brackets coaxially sleeved, the radiuses of the annular brackets are gradually increased from inside to outside, the annular bracket on the innermost layer is sleeved outside a pipeline to be subjected to vibration reduction, and the annular bracket on the innermost layer is sleeved outside the pipeline to be subjected to vibration reduction. A gap is formed between every two adjacent layers of annular supports, and the sizes of all the layers of gaps are equal; a plurality of compression and torsion units are arranged in each layer of gap in the circumferential direction of the annular support at equal intervals, the number of the compression and torsion units in each layer of gap is the same, and the compression and torsion units in the multiple layers of gaps are distributed in the radial direction of the annular support; in the same layer of gaps, the compression and torsion directions of the multiple compression and torsion units are consistent; and in two adjacent layers of gaps, the compression and torsion directions of the compression and torsion units are opposite. Low-frequency broadband vibration reduction of the ship pipeline system is achieved through a compression-torsion coupling mechanism.

Description

Technical Field

[0001] This application relates to the field of vibration damping devices, and in particular to a metamaterial structure vibration damping pipe clamp. Background Technology

[0002] In ship piping systems, vibration-damping clamps are primarily used to suppress vibrations and noise caused by pipeline flow, mechanical vibrations, or external excitations. With the continuous development of vibration control theory for ship piping systems, various suppression methods, including passive control, active control, and hybrid control, have been developed for the mid-to-high frequency bands, achieving significant results. However, low-frequency vibrations, due to their longer wavelengths and concentrated energy, are prone to coupling resonance with the ship's structure, posing a serious threat to ship safety and equipment lifespan, and have become a challenging problem in the field of vibration control. In practical ship applications, while widely used rubber-lined clamps can achieve effective attenuation at specific frequencies, their reliance on material damping characteristics and limited bandwidth make them insufficient to meet the practical needs of low-frequency broadband vibration reduction.

[0003] In recent years, metamaterial structures have provided a new approach to low-frequency vibration reduction due to their unique wave modulation capabilities. Studies have shown that chiral metamaterials with compression-torsional coupling mechanisms can generate vibration damping effects in the low-frequency band, possessing the potential to achieve broadband vibration suppression. However, existing structures of this type are mostly columnar, with their deformation mechanism occurring around the axial direction. Although they exhibit good torsional response and lightweight characteristics in specific directions, they also have inherent limitations such as limited configuration, difficulty in parallel integration, and sensitivity to processing errors, restricting their engineering applicability in complex installation environments.

[0004] Therefore, there is an urgent need to develop a new type of vibration damping pipe clamp structure that can achieve low-frequency broadband vibration control within the limited space of a ship's piping system, while taking into account structural stiffness, installation adaptability, and manufacturing feasibility, thereby making up for the shortcomings of existing technologies in the combined vibration suppression of medium and low frequencies. Summary of the Invention

[0005] In order to achieve low-frequency broadband vibration control within the limited space of a ship's piping system, this application provides a metamaterial structure vibration damping pipe clamp.

[0006] The metamaterial structure vibration damping tube clamp provided in this application adopts the following technical solution: A metamaterial structure vibration damping pipe clamp includes at least three coaxially sleeved annular supports. The radius of the multiple annular supports increases sequentially from the inside to the outside. The innermost annular support is sleeved on the outside of the pipe to be damped. There is a gap between two adjacent annular supports and the gaps between each layer are of equal size. Multiple compression and torsion units are evenly spaced along the circumference of the annular support in each layer of the gap. The number of compression and torsion units in each layer of the gap is the same. The compression and torsion units in multiple layers of the gap are distributed radially along the annular support. In the same layer of the gap, the compression and torsion directions of multiple compression and torsion units are consistent. In two adjacent layers of the gap, the compression and torsion directions of the compression and torsion units are opposite.

[0007] The vibration damping pipe clamp provided in this application combines a multi-layered annular support with circumferentially and radially periodically arranged compression and torsion units to form a metamaterial periodic structure with compression-torsion coupling effect. When the load is transferred to the vibration damping pipe clamp, the coordinated deformation of the multi-ring chiral units in the radial and circumferential directions, coupled with the torsional motion through translational motion, causes the equivalent mass to increase through the additional moment of inertia, dissipating the extra energy. The structure has a lower bandgap initiation frequency and a larger bandgap, thereby achieving low-frequency broadband vibration reduction of the pipeline system.

[0008] Furthermore, the metamaterial structure vibration damping tube clamp includes a detachably connected upper part and a lower part. Each of the upper and lower parts includes multiple semi-annular supports arranged coaxially and whose radii increase sequentially from the inside to the outside. The multiple annular supports are formed by the upper and lower parts being joined together.

[0009] The split design facilitates the installation, disassembly, and maintenance of pipe clamps on pipelines. The upper and lower parts are precisely aligned by a semi-circular bracket to form a complete circular bracket, ensuring the integrity and symmetry of the metamaterial periodic structure and ensuring that the vibration reduction performance is not affected by the installation method.

[0010] Furthermore, the compression and torsion unit includes a ring and two plate-shaped elastic members fixed to the outer periphery of the ring. The plate-shaped elastic members are arranged tangentially to the ring, and the two plate-shaped elastic members are centrally symmetrical with respect to the axis of the ring. The ends of the two plate-shaped elastic members are respectively fixed to the two annular supports.

[0011] By combining a circular ring with symmetrical plate-shaped elastic elements, the torsional motion of the ring can be effectively stimulated under pressure, realizing the energy conversion and dissipation between translation and rotation, enhancing the energy absorption efficiency of the unit under low-frequency vibration, and improving the overall vibration reduction performance.

[0012] Furthermore, it also includes connecting components for connecting the upper plurality of semi-circular supports and for connecting the lower plurality of semi-circular supports.

[0013] Connecting components help maintain the alignment of the upper and lower structures and the overall structural stability, preventing misalignment or loosening in vibrating environments.

[0014] Furthermore, the connecting assembly includes a plurality of butterfly connectors and a connecting plate fixed between two adjacent butterfly connectors, the ends of the innermost and outermost semi-annular brackets are fixed to the connecting plate, and the ends of the middle semi-annular brackets are fixed to the butterfly connectors.

[0015] Furthermore, the butterfly connector includes a V-shaped member and parallel plates fixed to both sides of the V-shaped member, and the end of the semi-annular bracket in the middle layer is fixed to the groove of the V-shaped member; the butterfly connector is elastic.

[0016] The combination of the butterfly connector and the connecting plate serves as a structural connection. Furthermore, due to the elastic deformation capability of the butterfly connector itself, it can buffer the movement of the circular bracket and help dissipate vibration energy, further improving the overall structure's vibration reduction effect, especially in the mid-to-low frequency range.

[0017] Furthermore, one of the connecting plates extends beyond the outermost semi-annular bracket to form an extension, the extension having a connecting hole for bolts to pass through, for connecting the upper and lower parts by bolts.

[0018] The extension and connection hole allow for quick and reliable connection between the upper and lower parts of the pipe clamp using fasteners such as bolts, significantly improving assembly efficiency and ensuring connection rigidity.

[0019] Furthermore, it also includes a support structure connecting the lower part to the platform base.

[0020] Furthermore, the support structure includes a mounting base, a support panel, and a support elbow plate. The mounting base is detachably connected to the platform base. The support panel is fixed between the mounting base and the lower outermost semi-circular bracket. The support elbow plate is fixed to both sides of the support panel and is orthogonal to the support panel.

[0021] The combination of the mounting base, support panel, and support elbow plate enhances the connection stiffness and stability between the metamaterial structure vibration damping pipe clamp and the mounting base.

[0022] Furthermore, one or more of the metamaterial structure vibration damping pipe clamps are sleeved along the pipeline to be damped.

[0023] It supports the use of multiple pipe clamps in series and can be flexibly configured according to vibration intensity and frequency band characteristics, significantly improving the overall vibration reduction effect of complex pipeline systems and having high engineering adaptability and scalability.

[0024] In summary, this application includes the following beneficial technical effects: The metamaterial structure vibration damping pipe clamp provided in this application integrates chiral compression-torsion units with compression-torsion coupling characteristics into a ring support in a radially multi-layered, circumferentially multi-period array. When the pipeline system is subjected to vibration excitation, it can effectively excite the mutual coupling and energy conversion of translational and torsional motions in the structure, significantly broaden the low-frequency vibration attenuation frequency band, effectively suppress the transmission of pipeline vibration caused by pump source excitation, and improve the problem of insufficient low-frequency broadband vibration damping capability of ship pipeline systems.

[0025] The structure adopts a split design and integrated molding process, which has good assembly adaptability and structural integrity, making it easy to install and maintain. Its rigid connection and support components further ensure the stability of the mounting base, making it suitable for complex working conditions. In addition, the pipe clamp supports single-point or multi-point series arrangement and can be flexibly configured according to vibration characteristics, providing a high-efficiency and reliable low-frequency broadband vibration reduction solution for marine piping systems. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is one of the dimension diagrams of an embodiment of this application; Figure 3 This is a second dimensional schematic diagram of an embodiment of this application; Figure 4 This is a schematic diagram of the compression torsion unit in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the connection component in an embodiment of this application; Figure 6 This is a schematic diagram of the compression-torsional coupling mechanism in the embodiments of this application; Figure 7 This is a schematic diagram of the test system in an embodiment of this application; Figure 8 This is the vibration response test result curve of the pipe clamp in the embodiment of this application.

[0027] Reference numerals: 1. Upper part; 2. Lower part; 3. Connecting hole; 4. Connecting plate; 5. First layer semi-circular support; 6. Second layer semi-circular support; 7. Third layer semi-circular support; 8. Fourth layer semi-circular support; 9. Compression torsion unit; 10. Plate-shaped elastic element; 11. Ring; 12. Mounting base; 13. Support panel; 14. Support elbow plate; 15. Butterfly connector; 151. V-shaped element; 152. Parallel plate; 16. Mounting hole; 17. Pipeline; 18. Raft platform; 19. Hull structure; 20. Elastic vibration damper; 21. Metamaterial structure vibration damping pipe clamp; 22. Rubber vibration isolator; 23. Pump source. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0029] This application discloses a metamaterial structure vibration damping tube clamp. (Refer to...) Figure 1 , Figure 2 and Figure 3 The metamaterial structure vibration damping pipe clamp includes an upper part 1 and a lower part 2. Each of the upper part 1 and the lower part 2 includes multiple coaxially arranged semi-circular supports with progressively increasing radii from the inside out. These are designated as the first layer of semi-circular supports 5, the second layer of semi-circular supports 6, the third layer of semi-circular supports 7, and the fourth layer of semi-circular supports 8. The radii of each semi-circular support are as follows: R 1=56mm R 2=78 mm R 3 = 100 mm and R 4 = 122mm, the thickness of the four-layer ring support is 122mm. t 1 = 2mm. The upper part 1 and the lower part 2 each include two sets of connecting components for connecting multiple semi-annular supports of the upper part 1, and multiple semi-annular supports of the lower part 2. The upper part 1 and the lower part 2 are joined together to form four coaxially arranged annular supports, with the innermost annular support fitted over the pipe to be vibration-damped.

[0030] Reference Figure 1 In the gap between two adjacent annular supports, six compression-torsion units 9 are evenly spaced along the circumference of the annular support; the vibration damping pipe clamp has a total of 18 compression-torsion units 9. (Refer to...) Figure 1 and Figure 4 The compression-torsion unit 9 includes a circular ring 11 and two plate-shaped elastic members 10 fixed to the outer periphery of the circular ring 11. The plate-shaped elastic members 10 are arranged tangentially to the circular ring 11, and the two plate-shaped elastic members 10 are centrally symmetrical with respect to the axis of the circular ring 11. The ends of the two plate-shaped elastic members 10 are respectively fixed to two annular supports. The inner diameter of the circular ring 11 is... r 1 = 4mm, thickness t 3=2mm, plate-shaped elastic element 10mm thick t 2 = 0.8 mm.

[0031] Reference Figure 1 and Figure 2 The compression-torsion units 9 in the multi-layer gaps are radially distributed along the annular support; in the same layer of gaps, the compression-torsion directions of multiple compression-torsion units 9 are consistent; in adjacent layers of gaps, the compression-torsion directions of the compression-torsion units 9 are opposite. Further, referring to... Figure 2 In the gap between two adjacent layers, the obtuse angle α between the plate-shaped elastic elements 10 of the two compression torsion units 9 is 130°-150°, preferably 140°; a suitable installation angle helps to ensure that the compression torsion unit 9 can convert the radial compression of the annular bracket into the sensitivity of circumferential misalignment.

[0032] Reference Figure 1 and Figure 5 Each connecting assembly includes two butterfly connectors 15 and connecting plates 4 fixed to both sides of the butterfly connectors 15; the butterfly connectors 15 are elastic and include a V-shaped member 151 and parallel plates 152 fixed to both sides of the V-shaped member 151, with the connecting plates 4 fixed to the ends of the parallel plates 152 and the two being perpendicular to each other. (Refer to...) Figure 2 and Figure 3 The thickness of the butterfly connector 15 T 2 = 1mm; Thickness of connecting plate 4 T 1 = 4 mm, width L 1=30 mm. Reference Figure 1 The ends of the first semi-circular bracket 5 and the fourth semi-circular bracket 8 are fixed to the connecting plate 4, and the ends of the second semi-circular bracket 6 and the third semi-circular bracket 7 are fixed to the slot of the V-shaped part 151 in the butterfly connector 15.

[0033] The combination of the butterfly connector 15 and the connecting plate 4 serves as a structural connection, linking multiple semi-circular supports in the upper part 1 or lower part 2 into a whole. The V-shaped groove structure facilitates installation with the ends of the intermediate layer semi-circular supports, improving connection accuracy and structural integrity. Simultaneously, due to the shape of the butterfly connector 15 and its elastic deformation capability, it can adaptively deform to accommodate the circumferential misalignment and radial vibration of the circular support, thus buffering the movement of the circular support and assisting in dissipating vibration energy, further enhancing the overall vibration reduction effect of the structure, especially in the mid-to-low frequency range.

[0034] Reference Figure 1 In each set of connecting components, a connecting plate 4 extends radially along the semi-circular bracket to the outside of the fourth layer of semi-circular bracket 8 to form an extension. The extension is provided with a connecting hole 3 for bolts to pass through, so as to connect the upper part 1 and the lower part 2 by bolts.

[0035] Reference Figure 1 and Figure 3 The lower part 2 is connected to a support structure, specifically, the support structure includes a mounting base 12, a support panel 13, and a support elbow plate 14. The mounting base 12 has mounting holes 16 at its four corners for detachably connecting it to the platform base (not shown in the figure) using bolts. The support panel 13 is fixed between the mounting base 12 and the fourth semi-circular bracket 8 of the lower part 2. The support elbow plate 14 is fixed to both sides of the support panel 13 and is orthogonal to the support panel 13. (Refer to...) Figure 2 and Figure 3 The thickness of the mounting base 12 is T 4 = 3mm, length L 3 = 265mm, width L2 = 100 mm; Thickness of support panel 13 and support elbow plate 14 T 3=2mm, the distance D=134 mm between the center of the pipe (the center of the circular bracket) and the upper surface of the mounting base 12.

[0036] This embodiment provides a metamaterial structure vibration damping pipe clamp manufactured using stainless steel through 3D printing. Stainless steel has the advantage of corrosion resistance, with an elastic modulus E=180 GPa and a density ρ=7850 kg / m³. 3 Poisson's ratio ν=0.3, manufacturing error controlled within ±0.1mm.

[0037] In other feasible implementations, the number of annular supports is not limited to the four layers disclosed in this embodiment, and the number of compression and torsion units 9 in the gap between each layer is not limited to the six disclosed in this embodiment. More annular supports and compression and torsion units 9 may also be provided.

[0038] The installation method of the metamaterial structure vibration damping pipe clamp provided in this embodiment is as follows: First, the lower part 2 is installed on the platform base of the pipeline system (not shown in the figure); then the pipeline is placed on the lower part 2 of the pipe clamp, so that the pipeline is in contact with the first layer of semi-circular support 5 of the lower part 2; finally, the upper part 1 and the lower part 2 are positioned through the connecting hole 3 and connected by bolts to complete the installation of the pipe clamp.

[0039] If multiple pipe clamps need to be installed in the piping system, install them according to the above procedure based on the location of each pipe clamp in the piping system.

[0040] This application achieves effective coupling of compressive and torsional motions by deforming the geometric configuration of the internal chiral units and combining it with a mechanical coupling mechanism; the core working principle of the designed compression-torsional coupled metamaterial structure is as follows: Figure 6 : When subjected to pressure in the Y direction, the pressure causes the structure to undergo translational displacement along the negative Y-axis. u The translational displacement drives the upper right cosine beam-shaped elastic element of the compression-torsion unit to undergo torsional displacement as shown in the figure around a direction perpendicular to the Z-axis. φ 1. This movement of the upper right cosine beam-shaped elastic element further acts on the upper right circular joint, which then generates a movement around its central axis. z The torsional motion of 1 is manifested as the corresponding torsional displacement. δ1. Simultaneously, the upper left cosine beam plate-shaped elastic element, symmetrical to the upper right cosine beam plate-shaped elastic element, and its connected circular joint point also act together in the same motion pattern, thus forming a consistent motion characteristic throughout the entire upper half. Driven by the compression and torsion unit motion in the upper half, the middle panel undergoes translational motion, which is further transmitted to the lower cosine beam plate-shaped elastic element and the circular joint point structure.

[0041] Similarly, the cosine beam-plate elastic element and the circular joint in the lower half also exhibit a similar motion pattern to the upper half, producing displacements respectively. φ 2 and δ 2. At this point, the movements of the upper and lower parts stimulate each other, and the rotation directions of the ring are opposite, forming a cyclic coupling mechanism in which compressive motion and torsional motion complement each other.

[0042] Based on the above working principle, this application constructs a metamaterial structure vibration-damping pipe clamp by periodically extending the compression-torsion unit along the radial and circumferential directions. The torsional motion of the compression-torsion unit is coupled through translational motion (rotational displacement of the annular support around its axis), causing the equivalent mass to increase through an additional moment of inertia, dissipating extra energy. This structure has a lower bandgap initiation frequency and a larger bandgap, thus achieving low-frequency broadband vibration reduction in the pipeline system. The butterfly-shaped connector with elastic deformation capability can buffer the movement of the annular support and assist in dissipating vibration energy, further improving the overall vibration reduction effect of the structure, especially in the mid-to-low frequency range.

[0043] To simulate the actual working conditions of the pipeline system, vibration transmission characteristics under pump source excitation were tested on the pipeline system to verify the vibration reduction capability of the metamaterial structure vibration reduction pipe clamp provided in this embodiment.

[0044] Test system reference Figure 7 A rubber vibration isolator 22 is installed at the end of the pipeline 17, and a metamaterial structure vibration damping pipe clamp 21 provided in this embodiment is installed in the middle. The lower part of the rubber vibration isolator 22 and the lower part of the metamaterial structure vibration damping pipe clamp 21 are both rigidly connected to the raft platform 18. The raft platform 18 is connected to the hull structure 19 through an elastic vibration damper 20. A pump source 23 is connected to the pipeline 17.

[0045] During the experiment, pump source 23 was turned on, and the excitation fundamental frequency was set to 48Hz. The vibration acceleration response at point P1 at the top of the pipe clamp and point P2 at the bottom of the pipe clamp was obtained. The positions of P1 and P2 are as follows: Figure 3 As shown, point P1 is the highest point of contact between the upper semi-circular support of the pipe clamp and the pipeline, and point P2 is a point on the pipe clamp mounting base. The acceleration vibration response curve of the pipe clamp in the 0-100Hz range under this operating condition is obtained, as shown below. Figure 8As shown, within the 20-100Hz frequency band, the vibration at the lower end of the pipe clamp is significantly lower than that at the upper end. The total acceleration level at the upper end is 105.63dB, while that at the lower end is 85.76dB, with a vibration level difference of 19.87dB. This indicates that the metamaterial structure vibration damping pipe clamp provided in this embodiment has a very good low-frequency broadband vibration damping effect.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A metamaterial structure vibration damping pipe clamp, characterized in that: It includes at least three coaxially fitted annular supports, the radius of which increases sequentially from the inside to the outside. The innermost annular support is fitted outside the pipe to be vibration damped, and there is a gap between adjacent annular supports with the gaps being of equal size. Multiple compression and torsion units are evenly spaced along the circumference of the annular support in each layer of the gap. The number of compression and torsion units in each layer of the gap is the same. The compression and torsion units in multiple layers of the gap are distributed radially along the annular support. In the same layer of the gap, the compression and torsion directions of multiple compression and torsion units are consistent. In two adjacent layers of the gap, the compression and torsion directions of the compression and torsion units are opposite.

2. The metamaterial structure vibration damping clamp according to claim 1, characterized in that: The metamaterial structure vibration damping tube clamp includes a detachably connected upper part and a lower part. Each of the upper and lower parts includes multiple semi-circular supports arranged coaxially and whose radii increase sequentially from the inside to the outside. The multiple circular supports are formed by the upper and lower parts being joined together.

3. The metamaterial structure vibration damping clamp according to claim 1, characterized in that: The compression and torsion unit includes a ring and two plate-shaped elastic members fixed to the outer periphery of the ring. The plate-shaped elastic members are arranged tangentially to the ring, and the two plate-shaped elastic members are centrally symmetrical with respect to the axis of the ring. The ends of the two plate-shaped elastic members are respectively fixed to the two annular supports.

4. The metamaterial structure vibration damping clamp according to claim 2, characterized in that: It also includes connecting components for connecting the upper plurality of semi-circular supports and for connecting the lower plurality of semi-circular supports.

5. The metamaterial structure vibration damping tube clamp according to claim 4, characterized in that: The connecting assembly includes a plurality of butterfly connectors and a connecting plate fixed between two adjacent butterfly connectors. The ends of the innermost and outermost semi-annular brackets are fixed to the connecting plate, and the ends of the middle semi-annular brackets are fixed to the butterfly connectors.

6. The metamaterial structure vibration damping clamp according to claim 5, characterized in that: The butterfly connector includes a V-shaped component and parallel plates fixed to both sides of the V-shaped component, and the end of the semi-annular bracket in the middle layer is fixed to the groove of the V-shaped component; the butterfly connector is elastic.

7. A metamaterial structure vibration damping clamp according to claim 6, characterized in that: One of the connecting plates extends beyond the outermost semi-circular bracket to form an extension, and the extension has a connecting hole for bolts to pass through, for connecting the upper part and the lower part by bolts.

8. A metamaterial structure vibration damping clamp according to claim 2, characterized in that: It also includes a support structure connecting the lower part to the platform base.

9. A metamaterial structure vibration damping tube clamp according to claim 8, characterized in that: The support structure includes a mounting base, a support panel, and a support elbow plate. The mounting base is detachably connected to the platform base. The support panel is fixed between the mounting base and the outermost semi-circular bracket at the bottom. The support elbow plate is fixed to both sides of the support panel and is orthogonal to the support panel.

10. A metamaterial structure vibration damping clamp according to claim 1, characterized in that: One or more of the metamaterial structure vibration damping pipe clamps are sleeved along the pipeline to be damped.

Images