A spring with quasi-zero stiffness

Abstract

The present invention relates to a low-frequency vibration isolation unit with quasi-zero stiffness and a novel spring, wherein the low-frequency vibration isolation unit comprises a base, a vertical plate, and a connecting concave plate with quasi-zero stiffness characteristics; the base is an arc-shaped structure and has a special-shaped depression that extends downward from its top; two connecting concave plates are symmetrically arranged on both sides of the vertical plate, and the first ends of the two connecting concave plates are respectively connected to the bottom of the vertical plate, and the second ends of the two connecting concave plates are respectively connected to the two side walls of the special-shaped depression. The present invention has a simple and compact structure, is lightweight, and has a strong load-bearing capacity and ultra-low-frequency vibration isolation performance.

Description

Technical Field

[0001] The present invention relates to the technical field of springs, in particular to a spring with quasi-zero stiffness. Background Art

[0002] Vibration isolation is an important measure taken to reduce vibration and its induced adverse effects. Generally, an isolation element is introduced between the vibration source and the receiving structure, isolating the vibration by altering the vibration transmission path. Spring isolators, as an important isolation element, can provide elastic support while isolating vibration transmission. Common spring isolators typically consist of a spring element and a damper in parallel, such as those found in the suspension systems of vehicles like automobiles and high-speed trains.

[0003] However, this method of vibration isolation places high demands on the isolator, and the mismatch between the spring element and the damper can severely impact the isolation effect, even leading to unforeseen accidents. Furthermore, because spring isolators, which combine spring elements and dampers, are typically bulky and have high requirements for specific application scenarios, their application is limited in some areas, such as vibration isolation in aerospace applications. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide a low-frequency vibration isolation unit and a new spring with quasi-zero stiffness, which have a simple and compact structure, light weight, strong bearing capacity, and ultra-low frequency vibration isolation performance.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The low-frequency vibration isolation unit with quasi-zero stiffness described in the present invention includes a base, a vertical plate and a connecting concave plate with quasi-zero stiffness characteristics; the base is an arc-shaped structure and has a special-shaped depression that is recessed downward from its top; the two connecting concave plates are symmetrically arranged on both sides of the vertical plate, and the first ends of the two connecting concave plates are respectively connected to the bottom of the vertical plate, and the second ends of the two connecting concave plates are respectively connected to the two side walls of the special-shaped depression.

[0007] In the low-frequency vibration isolation unit, preferably, the connecting concave plate is a plate-like structure with a downwardly recessed middle portion forming a "J"-shaped connecting concave plate.

[0008] In the low-frequency vibration isolation unit, preferably, the parameter setting of the “X”-shaped connecting concave plate satisfies the following formula:

[0009]

[0010] Where E is the Young's modulus material property of the "J"-shaped connecting concave plate; A is the cross-sectional area A = bh, b is the width, and h is the thickness; I is the moment of inertia of the cross section of the "J"-shaped connecting concave plate I = bh 3 / 12; L1 = 2d + a, a, d and c are the size parameters of the "J"-shaped connecting concave plate; l is the projected length of the "J"-shaped connecting concave plate after tilting, l = 2l1cosθ; θ is the tilt angle.

[0011] The new spring described in the present invention is characterized in that it includes: a quasi-zero stiffness low-frequency vibration isolation component, wherein several of the quasi-zero stiffness low-frequency vibration isolation components are stacked in sequence, and each of the quasi-zero stiffness low-frequency vibration isolation components is formed by circumferentially splicing several low-frequency vibration isolation units with quasi-zero stiffness according to any one of claims 1 to 3 to form an annular structure; and a top ring, wherein the top ring is arranged on the top of the uppermost layer of the quasi-zero stiffness low-frequency vibration isolation component.

[0012] For the novel spring, preferably, the number of low-frequency vibration isolation units with quasi-zero stiffness in each layer of the quasi-zero stiffness low-frequency vibration isolation assembly is the same, so as to achieve a broadband vibration isolation function.

[0013] The novel spring preferably has a different number of low-frequency vibration isolation units with quasi-zero stiffness in each layer of the quasi-zero stiffness low-frequency vibration isolation assembly, so as to achieve a vibration isolation function with multiple bearing energies.

[0014] The present invention has the following advantages due to the adoption of the above technical solution:

[0015] (1) Each layer of the quasi-zero stiffness low-frequency vibration isolation assembly of the present invention can use the same number of low-frequency vibration isolation units with quasi-zero stiffness to achieve a wide-band vibration isolation function; at the same time, different numbers of low-frequency vibration isolation units with quasi-zero stiffness on each layer can also be used to achieve vibration isolation functions with multiple load capacities;

[0016] (2) The novel spring described in the present invention has a simple and compact structure and is lightweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. Throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0018] Figure 1 is a schematic diagram of the overall structure of the first embodiment of the present invention, wherein the number of low-frequency vibration isolation units on each layer is the same;

[0019] Figure 2 Schematic diagram of the structure of the quasi-zero stiffness low-frequency vibration isolation unit of the present invention;

[0020] Figure 3 Schematic diagram of the structure of the connecting concave plate with quasi-zero stiffness characteristics of the present invention;

[0021] Figure 4 is a force-displacement curve diagram of the first embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of the overall structure of the second embodiment of the present invention, wherein the number of low-frequency vibration isolation units on each layer is different;

[0023] Figure 6 It is a force-displacement graph of the second embodiment of the present invention.

[0024] The symbols in the accompanying drawings represent the following:

[0025] 1-top ring; 2-quasi-zero stiffness low-frequency vibration isolation assembly; 201-low-frequency vibration isolation unit with quasi-zero stiffness; 2011-base; 2012-connecting concave plate; 2013-vertical plate. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0027] The present invention provides a low-frequency vibration isolation unit with quasi-zero stiffness and a new spring. The low-frequency vibration isolation unit with quasi-zero stiffness forms a quasi-zero stiffness low-frequency vibration isolation assembly, so that the new spring has ultra-low frequency vibration isolation performance, simple and compact structure, light weight, and strong bearing capacity.

[0028] Example 1:

[0029] like Figure 2 As shown, the present invention provides a low-frequency vibration isolation unit 201 with quasi-zero stiffness, including a base 2011, a vertical plate 2013 and a connecting concave plate 2012 with quasi-zero stiffness characteristics; the base 2011 is an arc-shaped structure and has a special-shaped depression that is recessed downward from its top; two connecting concave plates 2012 are symmetrically arranged on both sides of the vertical plate 2013, and the first ends of the two connecting concave plates 2012 are respectively connected to the bottom of the vertical plate 2013, and the second ends of the two connecting concave plates 2012 are respectively connected to the two side walls of the special-shaped depression.

[0030] In the above embodiment, preferably, the connecting concave plate 2012 is a plate-like structure with a downwardly recessed center portion thereof to form a "J"-shaped connecting concave plate.

[0031] The parameter setting of the “J”-shaped connecting concave plate satisfies the following formula:

[0032]

[0033] Where E is the Young's modulus material property of the "J"-shaped connecting concave plate; A is the cross-sectional area A = bh, b is the width, and h is the thickness; I is the moment of inertia of the cross section of the "J"-shaped connecting concave plate I = bh 3 / 12; L1 = 2d + a, a, d and c are the size parameters of the "J"-shaped connecting concave plate; l is the projected length of the "J"-shaped connecting plate after tilting, l = 2L1cosθ; θ is the tilt angle.

[0034] Example 2:

[0035] like Figure 1 As shown, the present invention also provides a new type of spring, comprising: a top ring 1 and a plurality of quasi-zero stiffness low-frequency vibration isolation components 2 with an annular structure, wherein the plurality of quasi-zero stiffness low-frequency vibration isolation components 2 are stacked in sequence, and the top ring 1 is arranged on the top of the uppermost quasi-zero stiffness low-frequency vibration isolation component 2; each quasi-zero stiffness low-frequency vibration isolation component 2 is composed of a plurality of low-frequency vibration isolation units 201 with quasi-zero stiffness spliced ​​circumferentially.

[0036] It should be noted that when a plurality of quasi-zero stiffness low-frequency vibration isolation assemblies 2 are stacked in sequence, counting from the bottom to the top, a plurality of low-frequency vibration isolation units with quasi-zero stiffness in the first layer are circumferentially spliced ​​to form a first layer of quasi-zero stiffness low-frequency vibration isolation assemblies, and the vertical plates of the low-frequency vibration isolation units with quasi-zero stiffness in each layer are connected to the bottom of the base of the quasi-zero stiffness low-frequency vibration isolation units in the second layer, and so on, until the vertical plates of the low-frequency vibration isolation units with quasi-zero stiffness in the top layer are connected to the bottom of the top ring 1;

[0037] Of course, the quasi-zero stiffness low-frequency vibration isolation component 2 can also be composed of a plurality of low-frequency vibration isolation units 201 with quasi-zero stiffness spliced ​​into a sheet-like structure.

[0038] In the above embodiment, preferably, the number of low-frequency vibration isolation units 201 with quasi-zero stiffness in each layer is the same, and the low-frequency vibration isolation units 201 with quasi-zero stiffness in adjacent layers are aligned.

[0039] Example 3:

[0040] Different from Example 2, the number of low-frequency vibration isolation units with quasi-zero stiffness in each layer is different, and the low-frequency vibration isolation units 201 with quasi-zero stiffness in adjacent layers can all be staggered, or some can be aligned and the other staggered.

[0041] The new spring provided by the present invention is designed through appropriate unit parameters, such as Figure 3As shown, the unit length dcacd, unit width b, and thickness h can make the low-frequency vibration isolation unit 201 with quasi-zero stiffness have a quasi-zero stiffness characteristic. When the number of low-frequency vibration isolation units 201 with quasi-zero stiffness in all layers is the same, the force-displacement curve is as shown in FIG. Figure 4 As shown. Among them, Figure 4 The quasi-zero stiffness curve shown corresponds to the unit parameters: a = 3.8 mm, b = 5 mm, c = 2.15 mm, d = 6.75 mm, h = 0.64 mm.

[0042] It should be noted that the quasi-zero stiffness characteristic achieved by the low-frequency vibration isolation unit 201 with quasi-zero stiffness is programmable, and this performance is completely consistent with the variation law of combined stiffness obtained by connecting ordinary springs in series or in parallel.

[0043] In addition, based on the low-frequency vibration isolation unit 201 with quasi-zero stiffness, a structure such as Figure 5 The structure shown has a richer gradient spring structure, that is, the number of low-frequency vibration isolation units 201 with quasi-zero stiffness in adjacent layers is different, showing a gradient distribution, and its force-displacement curve is shown in FIG. Figure 6 shown.

[0044] In summary, the novel spring proposed in the present invention can not only ensure the load-bearing capacity of the traditional spring under static load, but also realize the low-frequency and wide-band vibration isolation function with multiple load-bearing capacities under dynamic action.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A spring with quasi-zero stiffness, characterized in that: include: A quasi-zero stiffness low-frequency vibration isolation assembly, wherein a plurality of the quasi-zero stiffness low-frequency vibration isolation assemblies are stacked in sequence, and each of the quasi-zero stiffness low-frequency vibration isolation assemblies is formed into a ring structure by circumferentially splicing a plurality of low-frequency vibration isolation units with quasi-zero stiffness; A top ring, the top ring being arranged on the top of the quasi-zero stiffness low-frequency vibration isolation component of the uppermost layer; Wherein, the low-frequency vibration isolation unit includes a base, a vertical plate and a connecting concave plate with quasi-zero stiffness characteristics; The base is an arc-shaped structure and has a depression recessed downward from the top; The two connecting concave plates are symmetrically arranged on both sides of the vertical plate, and the first ends of the two connecting concave plates are respectively connected to the bottom of the vertical plate, and the second ends of the two connecting concave plates are respectively connected to the two side walls of the recess; The connecting concave plate is a plate-like structure with a downward concave middle portion thereof forming a "J"-shaped connecting concave plate; The parameter setting of the "J"-shaped connecting concave plate satisfies the following formula: Where E is the Young's modulus material property of the "J"-shaped connecting concave plate; A is the cross-sectional area A = bh, b is the width, and h is the thickness; I is the moment of inertia of the cross section of the "J"-shaped connecting concave plate I = bh 3 / 12; L1 = 2d + a, where a, d, and c are the dimensional parameters of the "J"-shaped connecting concave plate; l is the projected length of the "J"-shaped connecting concave plate after tilting, and l = 2L1cosθ; θ is the tilt angle.

2. The spring according to claim 1, wherein The number of low-frequency vibration isolation units with quasi-zero stiffness in each layer of the quasi-zero stiffness low-frequency vibration isolation assembly is the same, so as to achieve a broadband vibration isolation function.

3. The spring according to claim 2, characterized in that The number of low-frequency vibration isolation units with quasi-zero stiffness in each layer of the quasi-zero stiffness low-frequency vibration isolation assembly is different, so as to achieve a vibration isolation function with multiple bearing energies.

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