A stacked folded paper parallel low frequency wide bandwidth isolator

Abstract

This invention discloses a low-frequency wide-amplitude vibration isolator based on stacked origami in parallel, relating to the field of vibration reduction and isolation technology. The key technical features are: a base plate with fixed plates vertically positioned at both opposite edges; a guide rail at the bottom of the base plate, with its two ends abutting against the inner walls of the fixed plates on both sides; a slider on the outer side of the guide rail, slidably connected to the track end of the guide rail; a connecting plate vertically positioned at the top of the slider; a bearing platform at the end of the connecting plate away from the slider; and multistable origami cells on both sides of the connecting plate. In this invention, when the base plate is subjected to displacement excitation, the two symmetrically arranged isomorphic multistable origami cells, in parallel assembly, generate a wide-amplitude linear negative stiffness, which can cancel out the linear positive stiffness of the spring. Compared to the single-point zero-stiffness design of existing quasi-zero stiffness vibration isolators, this vibration isolator can achieve wide-amplitude zero stiffness, enabling low-frequency vibration isolation even at large amplitudes.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction and isolation technology, and more specifically, to a low-frequency wide-amplitude vibration isolator made of stacked origami in parallel. Background Technology

[0002] Vibration problems are widespread in various fields such as aerospace, precision instruments, and automotive engineering. External environmental excitations are typically characterized by low frequency and large amplitude, causing vibrations in components of mechanical structures. This vibration not only reduces the working efficiency of mechanical equipment and precision instruments but can also damage components and shorten the lifespan of the equipment. Therefore, designing a vibration isolator that can achieve low-frequency, wide-amplitude vibration isolation is a crucial issue.

[0003] In recent years, existing technologies have proposed a class of quasi-zero stiffness vibration isolators composed of parallel nonlinear negative stiffness elastic elements and linear positive stiffness elastic elements. According to vibration theory, for a linear passive vibration isolation system, only when the excitation frequency is greater than the system's natural frequency... Vibration isolation is only effective when the frequency is doubled; although quasi-zero stiffness vibration isolators use the nonlinear geometric arrangement of elastic elements to generate nonlinear negative stiffness to reduce the dynamic stiffness and natural frequency of the vibration isolator, thereby reducing the effective vibration isolation starting frequency and achieving low-frequency vibration isolation; however, such vibration isolators can only achieve low-frequency vibration isolation at small vibration amplitudes and cannot achieve wide-amplitude vibration isolation effects.

[0004] Therefore, the present invention aims to provide a stacked origami parallel vibration isolator capable of achieving low-frequency wide-range vibration isolation, in order to solve the aforementioned related problems. Summary of the Invention

[0005] The purpose of this invention is to provide a low-frequency wide-amplitude vibration isolator with stacked origami in parallel, in order to solve the technical problem mentioned above that the effective vibration isolation excitation amplitude is small and cannot achieve wide-amplitude vibration isolation effect in the prior art.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a low-frequency wide-amplitude vibration isolator with stacked origami in parallel, comprising a base plate, two opposite edges of the base plate being vertically provided with fixed plates, a guide rail being provided at the bottom of the base plate, and the two ends of the guide rail abutting against the inner sidewalls of the two fixed plates respectively, a slider being provided on the outer side of the guide rail, and the slider being slidably connected to the track end of the guide rail, a spring being vertically provided on one outer sidewall of the slider, the end of the spring away from the slider being provided on the inner sidewall of the fixed plate, a connecting plate being vertically provided at the top of the slider, a bearing platform being provided at the end of the connecting plate away from the slider, multistable origami cells being provided on both sides of the connecting plate, one end of the multistable origami cell being fixedly connected to the sidewall of the connecting plate, and the other end of the multistable origami cell being fixedly connected to the inner sidewall of the fixed plate.

[0007] The present invention is further configured such that the deformation direction of the multistable origami cell is consistent with the sliding direction of the guide rail.

[0008] The present invention is further configured such that the fixing plate and the base plate are fixedly connected by corner brackets.

[0009] The present invention is further configured such that the multistable origami cell is composed of multiple steel plates connected by an adhesive plastic film.

[0010] The present invention is further configured such that the multistable origami cells are all fixedly connected to the fixing plate and the connecting plate by bolts.

[0011] The present invention is further configured such that the multistable origami cell adopts either the Miura origami structure or the Kresling origami structure.

[0012] The present invention is further configured such that the multistable origami cells on both sides of the connecting plate are assembled in parallel.

[0013] The present invention is further configured such that the multistable origami cells are symmetrical to each other with the central longitudinal section of the connecting plate as the reference plane.

[0014] In summary, the present invention has the following beneficial effects:

[0015] 1. In this invention, when the base plate is subjected to displacement excitation, two symmetrically arranged isomorphic multistable origami cells, in parallel assembly, generate a wide-range linear negative stiffness, which can cancel out the linear positive stiffness of the spring. Compared with the existing quasi-zero stiffness vibration isolator design with single-point zero stiffness, this vibration isolator can achieve wide-range zero stiffness and achieve low-frequency vibration isolation effect under large amplitude.

[0016] 2. In this invention, the device structure provided by this technical solution has low complexity and convenient parameter adjustment, avoiding the increase in structural complexity of the vibration isolator caused by the introduction of a large number of adjustable parameters. It is easy to manufacture and install, operates more stably, and is suitable for various scenarios. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a low-frequency wide-amplitude vibration isolator with stacked origami in parallel according to an embodiment of the present invention;

[0018] Figure 2 This is a motion trajectory diagram of a multi-stable origami cell in a low-frequency wide-amplitude vibration isolator with stacked origami in parallel according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of a low-frequency wide-amplitude vibration isolator with stacked origami in parallel according to an embodiment of the present invention.

[0020] In the diagram: 1. Base plate; 2. Fixing plate; 3. Guide rail; 4. Slider; 5. Spring; 6. Connecting plate; 7. Supporting platform; 8. Multistable origami cell. Detailed Implementation

[0021] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in further detail below.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Example: A low-frequency wide-amplitude vibration isolator based on stacked origami in parallel, such as... Figure 1-3 As shown, a low-frequency wide-amplitude vibration isolator with stacked origami in parallel includes a base plate 1. Fixing plates 2 are vertically fixedly installed on both opposite edges of the base plate 1, and the fixing plates 2 are fixedly connected to the base plate 1 via angle brackets. A guide rail 3 is fixedly installed on the bottom of the base plate 1, and the two ends of the guide rail 3 abut against the inner sidewalls of the fixing plates 2 on both sides. A slider 4 is sleeved on the outer side of the guide rail 3, and the slider 4 is slidably connected to the track end of the guide rail 3. A spring 5 is vertically fixedly installed on one outer sidewall of the slider 4, and the end of the spring 5 away from the slider 4 is fixedly installed on the inner sidewall of the fixing plate 2. A connecting plate 6 is vertically fixedly installed on the top of the slider 4, and a bearing platform 7 is fixedly installed on the end of the connecting plate 6 away from the slider 4. Multistable origami cells 8 are fixedly installed on both sides of the connecting plate 6, and the multistable origami cells 8 on both sides are assembled in parallel. One end of the multistable origami cells 8 on both sides is fixedly connected to the side wall of the connecting plate 6 with bolts, and the other end of the multistable origami cells 8 on both sides is fixedly connected to the inner side wall of the fixing plate 2 with bolts. The multistable origami cells 8 are symmetrical about each other with the central longitudinal section of the connecting plate 6 as the reference plane.

[0025] It should also be noted that the deformation direction of the multistable origami cell 8 is consistent with the sliding direction of the guide rail 3.

[0026] In this embodiment, the multistable origami cell 8 is constructed by connecting multiple steel plates with an adhesive plastic film to form the Miura origami structure.

[0027] Since the stiffness of a single multistable origami cell 8 is nonlinear and has a negative stiffness segment, and its variation is non-uniform and asymmetrical, in this embodiment, by symmetrically stacking two multistable origami cells 8 in parallel, the negative stiffness segment formed between the two is a near-linear negative stiffness segment; at the same time, the spring 5 can provide a linear positive stiffness segment, so by connecting it in parallel with the spring 5, a relatively wide zero stiffness segment can be formed, which is suitable for wide-range low-frequency vibration isolation.

[0028] Working principle: When the base plate 1 is subjected to displacement excitation, the slider 4 slides on the slide rail 3, thereby compressing the spring 5. At this time, the spring 5 generates positive stiffness due to deformation. At the same time, the slider 4 drives the connecting plate 6 to move horizontally. Two multistable origami cells 8, which are symmetrically arranged on both sides of the connecting plate 6 in parallel assembly, generate a wide-range linear negative stiffness by mutual compression or stretching, which can cancel out the positive stiffness generated by the deformation of the spring 5, thereby achieving the effect of low-frequency vibration isolation under large amplitude.

[0029] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A stacked folded paper and parallel low frequency wide bandwidth isolator characterized by, The system includes a base plate (1), with fixed plates (2) vertically arranged on both opposite edges of the base plate (1). A guide rail (3) is provided at the bottom of the base plate (1), and the two ends of the guide rail (3) abut against the inner sidewalls of the fixed plates (2) on both sides. A slider (4) is provided on the outer side of the guide rail (3), and the slider (4) is slidably connected to the track end of the guide rail (3). A spring (5) is vertically arranged on one outer sidewall of the slider (4), and the end of the spring (5) away from the slider (4) is located on the inner sidewall of the fixed plate (2). A connecting plate (6) is vertically arranged at the top of the slider (4), and a bearing platform (7) is provided at the end of the connecting plate (6) away from the slider (4). Multistable origami cells (8) are provided on both sides of the connecting plate (6), and one end of the multistable origami cell (8) is fixedly connected to the sidewall of the connecting plate (6), and the other end of the multistable origami cell (8) is fixedly connected to the inner sidewall of the fixed plate (2).

2. A low frequency wide bandwidth isolator according to claim 1, wherein, The deformation direction of the multistable origami cell (8) is consistent with the sliding direction of the guide rail (3).

3. A low frequency wide bandwidth isolator according to claim 1, wherein, The fixing plate (2) and the base plate (1) are fixedly connected by corner brackets.

4. A low frequency wide bandwidth isolator according to claim 1, wherein, The multistable origami cell (8) is constructed by connecting multiple steel plates with an adhesive plastic film.

5. A low frequency wide bandwidth isolator according to claim 1, wherein, All the multi-stable origami cells (8) are fixedly connected to the fixing plate (2) and the connecting plate (6) by bolts.

6. A low frequency wide bandwidth isolator according to claim 1, wherein, The multistable origami cell (8) adopts either the Miura origami structure or the Kresling origami structure.

7. A low frequency wide bandwidth isolator according to claim 1, wherein, The multistable origami cells (8) on both sides of the connecting plate (6) are assembled in parallel.

8. A low frequency wide bandwidth isolator according to claim 1, wherein, The multistable origami cells (8) are symmetrical to each other with the central longitudinal section of the connecting plate (6) as the reference plane.

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