Multifunctional protection pad based on quasi-zero stiffness low-frequency vibration isolation

Abstract

The present application relates to a kind of multifunctional protective pad based on quasi-zero stiffness low-frequency vibration isolation, comprising protective pad unit assembly, the protective pad unit assembly includes quasi-zero stiffness low-frequency vibration isolation element and base pad assembly;Several quasi-zero stiffness low-frequency vibration isolation elements are respectively arranged on the base pad assembly, and several quasi-zero stiffness low-frequency vibration isolation elements are distributed in matrix;The quasi-zero stiffness low-frequency vibration isolation element includes top fixed washer, bottom fixed washer and double-curved beam;Several double-curved beams are respectively arranged between the top fixed washer and the bottom fixed washer, and several double-curved beams are circumferentially arranged around the top fixed washer or the bottom fixed washer.The present application is simple and compact in structure, small in space occupation, and light in structure deadweight.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of protective pads, in particular to a multifunctional protective pad based on quasi-zero stiffness low-frequency vibration isolation. BACKGROUND

[0002] Vibration is a common phenomenon in human production and life, and in most cases it will have a serious impact on human production and life. For example, the vibration around the factory will reduce the machining precision of precision instruments and cause fatigue damage to the structure of the building; the vibration accompanied by household appliances will make residents agitated, irritable, and even lose their sanity, and appear medical sinus arrhythmia, abnormal cerebral blood flow, and other symptoms. In addition, long-distance transportation of infant patients and fragile goods will be affected by the vibration on the way and cause unpredictable great harm. Therefore, solving the problem of low-frequency vibration isolation in vibration control has great research significance in the fields of engineering, rehabilitation medicine, and human daily life.

[0003] At present, passive control as an effective method of vibration control is widely used. This method introduces a vibration isolation element between the vibration source and the receiving structure to achieve the purpose of isolating vibration by changing the vibration transmission path. However, considering that the traditional linear vibration isolation method cannot effectively balance the system vibration isolation performance and carrying capacity, and the structure design that excessively deviates to the vibration isolation performance will greatly reduce the precision and stability of the linear vibration isolation system. In contrast, quasi-zero stiffness low-frequency vibration isolation has high carrying capacity and can meet the demand conditions of different application scenarios. In recent years, it has been the focus of researchers.

[0004] However, most existing quasi-zero stiffness structures achieve the mechanism through the parallel connection of two or more mechanical structures with positive stiffness and negative stiffness. The vibration isolation system obtained in this way has the following typical shortcomings in terms of structure volume, vibration isolation performance, and application scenarios: First, in terms of structure volume, the vibration isolation system obtained by parallel connection of mechanical structures with positive stiffness and negative stiffness has the shortcomings of complex structure, large size, and heavy weight. Second, in terms of vibration isolation performance, most existing quasi-zero stiffness vibration isolation systems are obtained through the mutual correlation and coupling of mechanical structures, which have the disadvantages of fixed carrying capacity and single vibration isolation interval. In addition, in terms of application scenarios, the vibration isolation system with complex structure and large volume is inconsistent with the compact, convenient, lightweight, and multifunctional purposes in engineering, medical, and daily life applications. SUMMARY

[0005] In view of the above problems, the present application aims to provide a multifunctional protective pad based on quasi-zero stiffness low-frequency vibration isolation, which has a simple and compact structure, occupies a small space, and has a light structure weight; in addition, the decoupling design between the constituent units of the protective pad can enable it to have multiple load-bearing capabilities, a wide vibration isolation interval, impact resistance, and low-frequency vibration isolation multifunctional characteristics.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] The multifunctional protective pad based on quasi-zero stiffness low-frequency vibration isolation comprises a protective pad unit assembly, which comprises quasi-zero stiffness low-frequency vibration isolation elements and a base pad assembly; a plurality of quasi-zero stiffness low-frequency vibration isolation elements are arranged on the base pad assembly, and the plurality of quasi-zero stiffness low-frequency vibration isolation elements are arranged in a matrix.

[0008] Preferably, the hyperbolic beam is formed by a plate-shaped structure that is bent in an arc shape along its length direction, and the plate-shaped structure is bent into a curved surface along its width direction.

[0009] Preferably, the hyperbolic beam has an initial deflection of the first-order buckling mode, and the expression is:

[0010]

[0011] In the formula, h is the initial height of the hyperbolic beam; x is the distance of any segment of the hyperbolic beam; L is the span of the hyperbolic beam; and w(x) is the initial deflection of the first-order buckling mode.

[0012] Preferably, the hyperbolic beam has a curvature in its cross section, and the curvature is C=1 / R.

[0013] In the formula, C is the curvature, and R is the radius.

[0014] Preferably, the multifunctional protective pad further comprises a coupling element arranged at the edge of the protective pad unit assembly, and a plurality of protective pad unit assemblies are freely combined and spliced into a whole protective pad through the coupling element.

[0015] Preferably, the coupling element is a lock, a zipper, or a hook-and-loop fastener.

[0016] Preferably, the base pad assembly is made of a flexible material.

[0017] The present application has the following advantages due to the above technical solutions:

[0018] (1) The multifunctional protective pad based on quasi-zero stiffness low-frequency vibration isolation according to the present application has simple and compact structure, small space occupation, and light structure weight.

[0019] (2) The decoupling design between the protective pad unit assemblies formed by the protective pad according to the present application can make the protective pad have the multifunctional characteristics of multi-bearing capacity, wide vibration isolation interval, impact resistance and low-frequency vibration isolation. BRIEF DESCRIPTION OF DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the present application. Throughout the drawings, same reference numerals are used to represent same components. In the drawings:

[0021] Figure 1 is a structural schematic diagram of an embodiment of the present application;

[0022] Figure 2 is a structural schematic diagram of a quasi-zero stiffness low-frequency vibration isolation element in Figure 1

[0023] Figure 3 is a structural schematic diagram of a hyperbolic beam in Figure 2

[0024] Figure 4 is a quasi-zero stiffness characteristic curve diagram of the hyperbolic beam;

[0025] Figure 5 is a structural schematic diagram of a first use state of the present application;

[0026] Figure 6 is a structural schematic diagram of a second use state of the present application.

[0027] In the drawings, each of the reference numerals represents the following:

[0028] 1 - quasi-zero stiffness low-frequency vibration isolation element; 101 - top fixed washer; 102 - bottom fixed washer; 103 - hyperbolic beam; 2 - base pad assembly; 3 - coupling element. DETAILED DESCRIPTION

[0029] ​​Exemplary embodiments of the present application will be described herein below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0030] The present application provides a multifunctional protection pad based on quasi-zero stiffness low-frequency vibration isolation. A plurality of quasi-zero stiffness low-frequency vibration isolation elements are arranged on a base pad assembly to achieve the effect of vibration isolation. The structure is simple and compact, occupies small space, and has light weight. In addition, the decoupling design between the protection pad unit assemblies of the protection pad can provide multiple load-bearing capacity, wide vibration isolation interval, impact resistance and low-frequency vibration isolation.

[0031] As shown in Figure 1 , the multifunctional protection pad based on quasi-zero stiffness low-frequency vibration isolation comprises a protection pad unit assembly, which comprises a quasi-zero stiffness low-frequency vibration isolation element 1 and a base pad assembly 2. A plurality of quasi-zero stiffness low-frequency vibration isolation elements 1 are arranged on the base pad assembly 2, and the plurality of quasi-zero stiffness low-frequency vibration isolation elements 1 are arranged in a matrix. Figure 2 As shown in , the quasi-zero stiffness low-frequency vibration isolation element 1 comprises a top fixed washer 101, a bottom fixed washer 102 and a hyperbolic beam 103. A plurality of hyperbolic beams 103 are arranged between the top fixed washer 101 and the bottom fixed washer 102, and a plurality of (four in this embodiment) hyperbolic beams 103 are arranged circumferentially around the top fixed washer 101 or the bottom fixed washer 102.

[0032] In the above embodiment, preferably, as shown in Figure 3 , the hyperbolic beam 103 is formed by a plate structure which is bent in an arc shape along the length direction, and the plate structure is bent into a curved surface along the width direction.

[0033] In the above embodiment, preferably, the hyperbolic beam 103 has an initial deflection of the first-order buckling mode, which is expressed as:

[0034]

[0035] In the formula, h is the initial height of the hyperbolic beam; x is the distance of any segment of the hyperbolic beam; L is the span of the hyperbolic beam; and w(x) is the initial deflection of the first-order buckling mode.

[0036] The cross section of the hyperbolic beam 103 has a curvature, and the curvature is C=1 / R; wherein C is the curvature, and R is the radius.

[0037] Under the joint action of the initial deflection w(x) and the curvature C, the hyperbolic beam 103 obtains the quasi-zero stiffness characteristic, and the characteristic curve is as shown in Figure 4 .

[0038] In the above embodiment, preferably, the application further comprises a coupling element 3 arranged at the edge of the protection pad unit assembly, and the plurality of protection pad unit assemblies are freely combined and spliced into a protection pad whole body with greater load-carrying capacity, wider vibration isolation interval and other multi-functional characteristics through the coupling element 3; wherein the coupling element 3 can be a lock, a zipper or a hook and loop. When the size to be protected is large, a plurality of protection pad unit assemblies can be coupled and combined with each other to obtain a protection pad with greater functionality, as shown in Figure 6 .

[0039] It should be noted that, since the quasi-zero stiffness low-frequency vibration isolation element 1 is pasted or sewn on the base pad 2 in a decoupling manner, and the quasi-zero stiffness low-frequency vibration isolation element 1 obtained by the hyperbolic beam 103 with different parameters can not only be designed to realize flexible load-carrying capacity, but also play a low-frequency vibration isolation role in different vibration isolation working intervals.

[0040] In the above embodiment, preferably, the base pad assembly 2 is made of flexible material. This design form can expand the function of the protection pad, such as protecting fragile goods during long-distance transportation in a surrounding manner, as shown in Figure 5 .

[0041] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit it; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A multifunctional protection pad based on quasi-zero stiffness low-frequency vibration isolation, characterized in that, The protective pad unit assembly comprises a quasi-zero stiffness low-frequency vibration isolation element and a base pad assembly; A plurality of quasi-zero stiffness low-frequency vibration isolation elements are arranged on the base pad assembly in a matrix distribution; The quasi-zero stiffness low-frequency vibration isolation element comprises a top fixed washer, a bottom fixed washer, and a hyperbolic beam; A plurality of hyperbolic beams are arranged between the top fixed washer and the bottom fixed washer, and a plurality of hyperbolic beams are arranged circumferentially around the top fixed washer or the bottom fixed washer; The hyperbolic beam is formed by a plate-shaped structure which is bent in an arc shape along the length direction, and the plate-shaped structure is bent into a curved surface along the width direction; The hyperbolic beam has an initial deflection of the first-order buckling mode, and the expression is: In the formula, h is the initial height of the hyperbolic beam; x is the distance of any segment of the hyperbolic beam; and L is the span of the hyperbolic beam. is the initial deflection for the first order buckling mode.

2. The multi-functional protective pad of claim 1, wherein The cross section of the hyperbolic beam has a curvature, and the curvature is C=1 / R. The coupling element is arranged at the edge of the protective pad unit assembly, and a plurality of protective pad unit assemblies are freely combined and spliced into a whole protective pad through the coupling element.

3. The multi-functional protective pad of claim 1, wherein The coupling element is a lock, a zipper or a hook and loop fastener.

4. The multi-functional protective pad of claim 3, wherein The base pad assembly is made of a flexible material.

5. The multi-functional protective pad of claim 1, wherein ​

Images