Compact type strong non-linear elastic structure and vibration absorption vibrator composed of compact type strong non-linear elastic structure

Abstract

The invention provides a compact type strong nonlinear elastic structure and a vibration absorption vibrator. The compact type strong nonlinear elastic structure comprises an outer layer structure and an inner layer structure, the outer layer structure comprises a bottom frame, an upper frame and a plurality of side wall frames; the top wall of each side wall frame is a pair of first sine elastic beams; a polygonal elastic structure is further arranged in each side wall frame, the bottom end of each polygonal elastic structure is fixedly connected to the bottom frame, and the top end of each polygonal elastic structure is connected with the bottom of a connecting beam; the middle of the connecting beam is fixedly connected with the first sine elastic beam, and the top is fixedly connected with the upper frame; the inner layer structure comprises a centrosymmetric elastic body, a first connecting block, a second connecting block, a plurality of polygonal elastic structures and a plurality of second sine elastic beams, wherein the first connecting block and the second connecting block are arranged at intervals in the vertical direction. The elastic structure adopts a double-layer nested elastic structure, the outer-layer structure is fixedly connected with a vibration reduction object, the inner-layer structure is connected with the mass block to form an internal vibrator, and the inner-layer structure and the outer-layer structure cooperate to generate a vibration absorption effect.

Description

Technical Field

[0001] This invention relates to the field of vibration absorber technology, specifically a compact, strongly nonlinear elastic structure and a vibration-absorbing oscillator composed of the aforementioned compact, strongly nonlinear elastic structure. Background Technology

[0002] Strongly nonlinear vibration absorbers, as a core technology in vibration control, have significant application value in precision instruments, aerospace equipment, high-precision machine tools, and microelectromechanical systems (MEMS) due to their unique wide-band vibration absorption capabilities and lightweight characteristics. Compared with traditional linear vibration absorbers, strongly nonlinear vibration absorbers can effectively suppress vibrations over a wider frequency range through their nonlinear stiffness characteristics (such as bistable and multistable behavior), significantly improving the operational stability and accuracy of equipment. In recent years, with the development of high-end equipment towards miniaturization and integration, higher requirements have been placed on the compactness and reliability of strongly nonlinear vibration absorbers.

[0003] Currently, the realization of strongly nonlinear vibration absorbers mainly relies on mechanical structures composed of multiple components. For example, CN119687133A discloses a three-dimensional composite oscillator dynamic vibration absorber and vibration absorption method; it achieves multi-directional vibration control through the combination of multiple oscillators and elastic elements, but its structure requires a large number of connecting parts and assembly interfaces, resulting in a large size and difficulty in miniaturization.

[0004] Existing technologies often face the following problems: To achieve nonlinear stiffness, multiple elastic units (such as springs or beam structures) are usually connected in series or in parallel and assembled by mechanical connections such as hinges or bolts, which leads to an increase in the number of components and an expansion in volume. Traditional machining techniques (such as milling and wire EDM) struggle to integrally form elastic structures with complex internal topologies, while modular manufacturing and assembly introduce gaps and errors, weakening the accuracy and stability of nonlinear characteristics; and When the size of the vibration absorber is reduced to the millimeter level, the interfacial forces (such as friction and adhesion) between components are significantly enhanced, further affecting the dynamic performance.

[0005] Therefore, we consider using 3D printing technology to utilize additive manufacturing of metal or polymer materials to achieve integrated molding of complex elastic structures, avoiding the assembly of multiple parts. This allows the strong nonlinear vibration absorber to be arbitrarily scaled within a large range according to the mass and volume of the object being absorbed. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention proposes a compact, strongly nonlinear elastic structure and a vibration-absorbing oscillator composed of it. The compact, strongly nonlinear elastic structure employs a double-layer nested elastic structure. The inner layer has a radially symmetrically arranged polygonal elastic structure and a second sinusoidal elastic beam, which can be considered as a spring with special stiffness characteristics. After being connected to a mass block via a first connecting block, it forms an internal oscillator. The outer layer has a first sinusoidal elastic beam and a polygonal elastic structure, which can also be considered as a spring with special stiffness characteristics. It is connected to an external vibration-damping object via bolts. The two layers, together with the inner and outer layers themselves, constitute a multi-degree-of-freedom vibration system.

[0007] A first aspect of the present invention is to provide a compact, strongly nonlinear elastic structure, comprising an outer layer structure and an inner layer structure located inside the outer layer structure; The outer structure includes a bottom frame, an upper frame, and multiple sidewall frames connecting the two. The bottom frame is a rigid frame, and each side wall frame is arranged perpendicular to one side of the bottom frame; the top wall of each side wall frame is a pair of first sinusoidal elastic beams; the first sinusoidal elastic beams extend in opposite wavy shapes; Each of the sidewall frames is further provided with a polygonal elastic structure, the bottom end of which is fixed to the bottom frame and the top end of which is connected to the bottom of a connecting beam; the middle of the connecting beam is fixed to a first sinusoidal elastic beam and the top of which is fixed to the upper frame; the deformation of the first sinusoidal elastic beam and the polygonal elastic structure provides elasticity to the outer structure. The upper frame is a rigid rectangular frame, and its inner wall is fixedly connected to the inner layer structure. The inner structure includes an outer shell and an elastomer located therein; The elastic body is a centrally symmetrical elastic mechanism, including a first connecting block and a second connecting block spaced apart along the vertical direction, 2n polygonal elastic structures, and 2n second sinusoidal elastic beams; one end of each polygonal elastic structure is fixedly connected to one side wall of the first connecting block, and the other end of each polygonal elastic structure is fixedly connected to the side wall of the second connecting block on the same side; one end of each second sinusoidal elastic beam is fixedly connected to the side wall of the first connecting block, and the other end is fixed to the outer shell; where n is a positive integer; the deformation of the second sinusoidal elastic beams and the polygonal elastic structures provides elasticity to the inner structure.

[0008] Furthermore, both the first and second sinusoidal elastic beams are sinusoidal curves or quasi-sinusoidal curves with constant amplitude and wavelength.

[0009] Furthermore, the maximum angle formed between the tangent at the vertex of the waveform curve of the first sinusoidal elastic beam and the horizontal direction does not exceed 30°.

[0010] Furthermore, the bottom frame is a rigid rectangular frame, with rigid prisms extending upwards from each of the four corners of the bottom frame; a pair of first sinusoidal elastic beams span the tops of two opposing prisms on the corresponding sides of the bottom frame; the two ends of the first sinusoidal elastic beams are respectively fixedly connected to the tops of the corresponding rigid prisms. Thus, the bottom frame, the four prisms, and the four pairs of first sinusoidal elastic beams together define a receiving space covered by the upper frame, used to accommodate the inner structure.

[0011] Furthermore, the polygonal elastic structure is a closed polygon formed by connecting multiple straight line segments end to end in sequence, and the interior angles of the polygon include at least two opposite acute angles.

[0012] Furthermore, the rigid prism has through holes for fixing to external equipment. Furthermore, both the first and second connecting blocks are rectangular blocks, and the polygonal elastic structure is a U-shaped structure, including two opposing wing arms and a connecting arm; at least the wing arms are flat and have straight edges; and the distance between the ends of the two wing arms near the connecting block is greater than the distance between the two ends of the connecting arm.

[0013] A second aspect of the present invention is to provide a strongly nonlinear oscillator, comprising a mass block and a compact strongly nonlinear elastic structure for vibration absorption, wherein the mass block is fixed on a first connecting block; and a vertical gap is provided between the bottom surface of the inner layer structure and the bottom surface of the outer layer structure; the vertical gap is configured to accommodate the mass block and provide vibration space for the mass block in the vertical direction, thereby avoiding rigid collisions or motion interference during dynamic operation.

[0014] More preferably, the vertical spacing is greater than the maximum amplitude of the mass block in the vertical direction.

[0015] Furthermore, the compact, highly nonlinear elastic structure used for vibration absorption is integrally formed using 3D printing technology.

[0016] Preferably, the material used in the 3D printing technology is selected from one of ABS, PC, PEEK, or TPU materials.

[0017] The beneficial effects of this invention are as follows: The compact, strongly nonlinear elastic structure for vibration absorption described in this invention employs a double-layer nested elastic structure. The outer layer utilizes the waveform bending of a first sinusoidal elastic beam and the directional bending of a polygonal elastic structure. The inner layer utilizes its radially symmetrically arranged polygonal elastic structure and a second sinusoidal elastic beam to generate strong nonlinear stiffness. The two layers are spatially coupled, and the curve of its stiffness changing with displacement exhibits complex nonlinear characteristics. This characteristic can be precisely designed and controlled by adjusting the waveform parameters of the sinusoidal beam (such as amplitude, wavelength, and tilt angle), the angle and shape of the polygonal structure, and the gap between the two layers, thereby achieving efficient absorption of vibration energy in specific frequency bands. The inner structure is nested within the outer structure. The various types of elastic bodies in the two structures work in parallel within a finite volume. Through different modes of bending and deformation, a large amount of vibration energy can be dissipated through structural damping when relative displacement occurs. Moreover, the outer structure is connected to the external vibration damping object by bolts, bearing the vibration load and attenuating it. The inner structure is connected to the mass block through the first connecting block to form an internal oscillator. The two structures and the inner and outer structures themselves together constitute a multi-degree-of-freedom vibration system that can effectively cope with complex vibrations from the vertical direction with different energy spectra, providing multi-level, wide-frequency vibration absorption effects. Attached Figure Description

[0018] Figure 1 A schematic diagram of the overall structure of the compact, strongly nonlinear elastic structure described in this invention; Figure 2 This is a schematic diagram of the outer structure of the compact, strongly nonlinear elastic structure. Figure 3 This is a schematic diagram of the inner layer structure of the compact, strongly nonlinear elastic structure. Figure 4 yes Figure 3 A schematic diagram of the structure of the elastic body with the inner layer structure shown; Figure 5 Is with Figure 4 The mass block is fixedly connected to the elastic body shown.

[0019] Wherein, 1: outer structure; 2: inner structure; 3: mass block; 11: bottom frame; 12: polygonal elastic structure; 13: first sinusoidal elastic beam; 14: upper frame; 15, 25: through holes; 16: prism; 17: connecting beam; 21: outer shell; 22: polygonal elastic structure; 23: second sinusoidal elastic beam; 24: first connecting block; 26: second connecting block; 27: protrusion. Detailed Implementation

[0020] To make the objectives, technical solutions, beneficial effects, and significant advancements of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings provided in the examples of the present invention. Obviously, all the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this application, unless otherwise expressly specified and limited, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more; unless otherwise specified or explained, the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] This embodiment provides a vibration-absorbing oscillator capable of vibration absorption, comprising a mass block 3 and a compact, strongly nonlinear elastic structure for vibration absorption. The "connection" mentioned in this embodiment refers to a single, integral connection. The elastic structure is fabricated in one step using 3D printing equipment. The 3D printing material is ABS, but PC, PEEK, TPU, or metal materials can also be used depending on the actual needs. For ease of description, it is broken down into multiple components.

[0023] like Figure 1 As shown, the compact, highly nonlinear elastic structure includes an outer layer structure 1 and an inner layer structure 2, both printed in one step using 3D printing. A vertical gap is provided between the bottom surface of the inner layer structure 2 and the bottom surface 1 of the outer layer structure; this vertical gap is greater than the maximum amplitude of the mass block 3 in the vertical direction, serving not only to accommodate the mass block but also to provide vibration space for the mass block 3 in the vertical direction, thus preventing rigid collisions or motion interference during dynamic operation.

[0024] like Figure 2As shown, the outer structure 1 has an internal space for accommodating the inner structure. The outer structure includes a bottom frame 11, four side wall frames, four connecting beams 17, and an upper frame 14. The bottom frame 11 is a rectangular frame, with a rigid prism 16 extending vertically upward from each of its four corners. Each prism 16 has a through hole 15 for bolts to pass through, thereby fixing the outer structure 1 to the vibration damping object (such as an equipment base). The four side wall frames are vertically erected perpendicular to the four sides of the bottom frame 11. Each side wall frame consists of the following components: one side of the bottom frame 11 as the bottom edge, two prisms 16 located at both ends of the bottom edge as vertical edges, and two first sinusoidal elastic beams 13 connecting the tops of the two prisms 16 as top edges. In this configuration, one end of a first sinusoidal elastic beam 13 is fixedly connected to the top of each prism 16, and the other end of the first sinusoidal elastic beam 13 is fixedly connected to the connecting beam 17. Two first sinusoidal elastic beams 13 arranged opposite each other and jointly fixed to a connecting beam 17 form a pair of first sinusoidal elastic beams 13. Thus, the four base edges, the four prisms 16, and the four pairs of first sinusoidal elastic beams 13 together enclose a cubic space with an open top.

[0025] The first sinusoidal elastic beam 13 exhibits a continuous wavy (sine-like) line, the waveform of which can be defined as a sinusoidal or quasi-sine curve with constant amplitude and wavelength. The maximum angle (i.e., waveform tilt angle) formed by the tangent at the apex of the waveform curve of the first sinusoidal elastic beam and the horizontal direction is less than 30°. The deformation of the first sinusoidal elastic beam 13 and the polygonal elastic structure 12 provides elastic force to the outer structure, which can be regarded as a spring with special stiffness characteristics. The deformation of the second sinusoidal elastic beam 23 and the polygonal elastic structure 22 provides elastic force to the inner structure, which can be regarded as another spring with special stiffness characteristics. After the mass block 3 is installed, a vibration-absorbing oscillator is formed, which can absorb the energy of the vibration-damping object. Within each sidewall frame (between two prisms 16), a polygonal elastic structure 12 is provided. The bottom end of the polygonal elastic structure 12 is fixedly connected to the corresponding side of the bottom frame 11, and its top end is connected to the bottom of the connecting beam 17. Furthermore, the polygonal elastic structure 12 is formed by multiple straight segments connected end-to-end to create a closed hexagon, and the interior angles of the hexagon include at least two opposite acute angles. This arrangement allows the structure to undergo significant bending deformation rather than simple axial contraction when compressed, thereby dissipating more vibrational energy through material bending. In other embodiments, two or more polygonal elastic structures 12 may be provided within each sidewall frame, and the shape of the polygonal elastic structure 12 is not limited to hexagon; it can be octagonal or other forms.

[0026] The connecting beam 17 is a vertical force transmission component. Its bottom is connected to the top wall of the polygonal elastic structure 12, its middle is fixed to the first sinusoidal elastic beam 13, and its top is fixed to the upper frame 14.

[0027] The upper frame 14 is located on top of the outer structure 1 and is also a rigid rectangular frame. The outer contours of the upper frame 14 and the bottom frame 11 are the same, and the width of the rectangular frame contour of the upper frame 14 is greater than the width of the bottom frame 11, that is, the contour of the upper frame 14 extends inward. Moreover, the inner wall of the upper frame 14 is fixedly connected to the outer shell 21 of the inner structure. The upper frame 14 and the outer shell 21 it forms are also equivalent to a mass block, and together with the polygonal elastic body 12 and the first sinusoidal elastic beam 13, they are equivalent to an oscillator.

[0028] The four built-in polygonal elastic structures 12, together with the bottom frame 11 and the upper frame 14, form a structural layer with a certain degree of elasticity. The outer structure 1, through the synergistic effect of the waveform bending deformation of the first sinusoidal elastic beam 13 and the bending deformation of the polygonal elastic structures 12 in three-dimensional space, provides the system with strong nonlinear stiffness and damping characteristics, which is the core of achieving broadband vibration absorption function.

[0029] like Figure 3-4 As shown, the inner structure 2 includes an outer shell 21 and an elastic body located therein; the elastic body includes four polygonal elastic structures 22, four second sinusoidal elastic beams 23, a first connecting block 24, and a second connecting block 26. The polygonal elastic structures 22 and the second sinusoidal elastic beams 23 are arranged radially with the first connecting block and the second connecting block 26 as the starting point, forming a centrally symmetrical composite elastic mechanism.

[0030] Both the first connecting block 24 and the second connecting block 26 are rectangular structures, each with four sidewalls. The first connecting block 24 and the second connecting block 26 are arranged vertically, with the bottom surface of the second connecting block 26 facing its top surface. There is a certain distance between the opposing surfaces of the first connecting block 24 and the second connecting block 26. Each sidewall of the first connecting block 24 is fixedly connected to one end of a polygonal elastic structure 22, and each sidewall of the second connecting block 26 is fixedly connected to the other end of the polygonal elastic structure 22. Furthermore, the first connecting block 24 has a through hole 25, allowing bolts to be used to connect the first connecting block 24 to... Figure 5 Mass block 3 shown is fixedly connected.

[0031] The polygonal elastic structure 22 is a U-shaped structure, a flat, straight-edged rigid polygonal arm; it includes two wing arms and one connecting arm; the two ends of the connecting arm are respectively connected to one end of each of the two wing arms. The two free ends are respectively fixedly connected to the sidewalls of the first connecting block 24 and the second connecting block 26 in the same direction, extending radially outward from the connecting blocks. Furthermore, the distance between the two ends of the polygonal elastic structure 22 is greater than the distance between the two ends of the connecting arm.

[0032] One end of the second sinusoidal elastic beam 23 is fixed to the four side walls of the first connecting block 24, and the fixed position is located below the polygonal elastic structure 22. Furthermore, the other end of the second sinusoidal elastic beam 23 has a protrusion 27 extending away from the second connecting block 26 along its end; the protrusion 27 is the part fixed to the outer shell 21. The second sinusoidal elastic beam 23 presents a continuous wavy (sine-like) line, and its waveform can be defined as a sinusoidal curve or a quasi-sine curve with constant amplitude and wavelength. Its structure is the same as that of the first sinusoidal elastic beam, and will not be described again here.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A compact strongly nonlinear elastic structure, characterized in that The outer layer structure (1) and the inner layer structure (2) inside the outer layer structure (1); The outer layer structure (1) comprises a bottom frame (11), an upper frame (14) and a plurality of side wall frames connected between the bottom frame (11) and the upper frame (14); The bottom frame (11) is a rigid frame, and each side wall frame is arranged perpendicularly to one side of the bottom frame (11); the top wall of each side wall frame is a pair of first sinusoidal elastic beams (13); the first sinusoidal elastic beams (13) extend in opposite wave shapes; A polygonal elastic structure (12) is further arranged in each side wall frame, the bottom end of the polygonal elastic structure (12) is fixedly connected to the bottom frame (11), and the top end of the polygonal elastic structure (12) is connected to the bottom of a connecting beam (17); the middle part of the connecting beam (17) is fixedly connected to the first sinusoidal elastic beam (13), and the top part of the connecting beam (17) is fixedly connected to the upper frame (14); The deformation of the first sinusoidal elastic beam (13) and the polygonal elastic structure (12) provides elastic force for the outer layer structure; The upper frame (14) is a rigid rectangular frame, and the inner wall of the upper frame (14) is fixedly connected to the inner layer structure (2); The inner layer structure (2) comprises an outer shell (21) and an elastic body inside the outer shell (21); The elastic body is a central-symmetrical elastic mechanism comprising a first connecting block (24) and a second connecting block (26) arranged in a vertical direction, 2n polygonal elastic structures (22) and 2n second sinusoidal elastic beams (23); one end of the polygonal elastic structure (22) is fixedly connected to one side wall of the first connecting block, and the other end of the polygonal elastic structure (22) is fixedly connected to the side wall on the same side of the second connecting block (26); one end of the second sinusoidal elastic beam (23) is fixedly connected to the side wall of the first connecting block (24), and the other end of the second sinusoidal elastic beam (23) is fixedly connected to the outer shell (21); Wherein n is a positive integer; The first sinusoidal elastic beam (13) and the second sinusoidal elastic beam (23) are both sinusoidal curves or similar sinusoidal curves with constant amplitudes and wavelengths.

2. The compact strongly nonlinear elastic structure of claim 1, wherein, The maximum included angle formed by the tangent line of the wave vertex of the first sinusoidal elastic beam (13) and the horizontal direction is not more than 30°.

3. The compact strongly nonlinear elastic structure of claim 1, wherein, The bottom frame (11) is a rigid rectangular frame, and rigid prisms (16) are formed by extending upward from the four corners of the bottom frame (11); the top ends of the two prisms (16) arranged opposite to the side of the bottom frame (11) span a pair of first sinusoidal elastic beams (13); the two ends of the first sinusoidal elastic beam (13) are fixedly connected to the top ends of the rigid prisms (16) on the corresponding sides; thus, the bottom frame (11), the four prisms (16) and the four pairs of first sinusoidal elastic beams (13) jointly define a containing space covered by the upper frame (14) at the top, for containing the inner layer structure (2).

4. The compact strongly nonlinear elastic structure of claim 1, wherein, The polygonal elastic structure (12) is a closed polygon formed by sequentially connecting a plurality of straight line segments, and the internal angles of the polygon contain at least two oppositely arranged acute angles.

5. The compact strongly nonlinear elastic structure of claim 1, wherein, ​ 6. The compact strongly nonlinear elastic structure of claim 4, wherein, A through hole (15) is formed in the rigid prism (16) for fixing with external equipment.

7. The compact strongly nonlinear elastic structure of claim 1, wherein, The first connecting block (24) and the second connecting block (26) are both rectangular blocks, the polygonal elastic structure (22) is a U-shaped structure, including two oppositely arranged wings and a connecting arm; at least the wings are flat and the edges are straight; and the distance between the ends of the two wings close to the connecting block is greater than the distance between the two ends of the connecting arm.

8. A vibration absorber characterized by The compact strong nonlinear elastic structure according to any one of claims 1-7, and a mass block (3) fixed on the first connecting block (24); and a vertical spacing is arranged between the bottom surface of the inner layer structure and the bottom surface of the outer layer structure; the vertical spacing is configured to accommodate the mass block (3) and provide vibration space for the mass block (3) in the vertical direction.

9. The vibration absorber of claim 8, wherein The compact strong nonlinear elastic structure is integrally formed by 3D printing technology, and the material is selected from one of ABS, PC, PEEK or TPU materials.

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