Embedded multistage vibrator type layered periodic vibration isolator

Abstract

The invention discloses an embedded multistage vibrator type layered periodic vibration isolator, which relates to the technical field of vibration isolation and vibration reduction, and comprises at least two periodic vibration isolation unit structures connected in series, each periodic vibration isolation unit structure comprises a Bragg type periodic structure, and a plurality of stages of vibrator structures are embedded into the outer side of the Bragg type periodic structure; the Bragg type periodic structure comprises a layered elastic block and a layered mass block; the vibrator structure comprises an elastic thin plate and an annular mass block; and in the same periodic vibration isolation unit structure, the resonant frequencies of all stages of oscillator structures are different. The multiple stages of oscillator structures are embedded into the outer side of the Bragg type periodic structure, the resonant frequencies of all the stages of oscillator structures are set to be different, multiple LR band gaps and one broadband Bragg band gap can be achieved to be used for reducing vibration energy of multiple specific frequency bands, the advantages of being stable in bearing performance and compact in structural space are achieved, and the engineering vibration reduction requirement is better met.

Description

Technical Field

[0001] The present application relates to the technical field of vibration isolation and vibration reduction, and in particular to a layered periodic vibration isolator embedded with a multi-stage oscillator. Background Art

[0002] For the mechanical vibration and impact generated during the operation of high-end mechanical equipment, vibration isolators can be set on the vibration and impact transmission path to block the transmission of vibration and impact energy. Although the traditional vibration isolation structure has the advantage of wide-band vibration isolation performance, it also means that its ability to attenuate vibration waves in specific frequency bands is limited. Therefore, it is necessary to further improve the vibration wave filtering performance of the vibration isolator in specific frequency bands.

[0003] In recent years, with the rise of phononic crystal theory in the field of condensed matter physics, it has been discovered that mechanical metamaterials have special physical properties that change the size or direction of vibration waves. According to the different band gap formation mechanisms, mechanical metamaterials can be divided into Bragg-type metamaterials and LR-type metamaterials. Since the band gap characteristics of the mechanical metamaterial structure mean that the vibration wave can be greatly attenuated in the band gap frequency band. Therefore, combining the mechanical metamaterial structure with the traditional vibration isolation structure can improve the vibration reduction performance of the traditional vibration isolation structure in a specific frequency band.

[0004] In the prior art, Chinese patent CN116538232A discloses a periodic oscillator structure with multiple local resonance band gaps, which is composed of a periodic oscillator structure and multiple types of LR vibration absorbers, wherein the periodic oscillator structure is composed of countless identical periodic units connected in series through two nodes, and each periodic unit is composed of an oscillator mass block and an oscillator spring, the oscillator mass block is a rigid body, and the oscillator spring is a one-dimensional elastic element; multiple types of LR vibration absorbers are installed on the periodic oscillator structure, each type of LR vibration absorber is composed of a vibration absorber mass block and a vibration absorber spring, and the mass and resonance frequency of each type of LR vibration absorber are the same.

[0005] However, although the above-mentioned periodic oscillator structure of the prior art has multiple LR band gaps and one Bragg band gap, its bearing performance is unstable and the structural space is not compact, making it difficult to meet the requirements of engineering vibration reduction. Summary of the invention

[0006] The present application provides a layered periodic vibration isolator embedded with a multi-stage oscillator, which is used to solve the problems in the prior art that the bearing performance of the periodic oscillator structure is unstable, the structural space is not compact, and it is difficult to adapt to the requirements of engineering vibration reduction.

[0007] On the one hand, the present application provides an embedded multi-stage oscillator-type layered periodic vibration isolator, including at least two periodic vibration isolation unit structures connected in series; each periodic vibration isolation unit structure includes a Bragg-type periodic structure, and several levels of oscillator structures are embedded on the outer side of the Bragg-type periodic structure.

[0008] The Bragg type periodic structure comprises: a layered elastic block and a layered mass block.

[0009] The vibrator structure comprises an elastic thin plate and an annular mass block.

[0010] The layered elastic block is connected in series with the layered mass block. A plurality of elastic thin plates are embedded in the outer side of the layered mass block. The outer periphery of each elastic thin plate is fixedly connected with one of the annular mass blocks.

[0011] In the same periodic vibration isolation unit structure, the resonant frequency of each level of the oscillator structure is different.

[0012] In a possible implementation manner, the cross-sectional shape of the layered elastic block and the layered mass block is one of a circle and a polygon.

[0013] In a possible implementation manner, the cross-sectional shape of the elastic thin plate and the annular mass block is one of a circular ring shape and a polygonal ring shape.

[0014] In a possible implementation, the layered elastic block is made of a polymer damping material.

[0015] The polymer damping material includes: rubber, metal rubber and polyurethane.

[0016] In a possible implementation, the layered mass block, the elastic thin plate and the annular mass block are made of metal materials or composite materials with high density and high modulus characteristics.

[0017] The embedded multi-stage oscillator layered periodic vibration isolator in the present application has the following advantages:

[0018] By embedding several levels of oscillator structures on the outside of the Bragg-type periodic structure and setting the resonant frequency of each level of the oscillator structure to be different, multiple LR band gaps and a wide-band Bragg band gap can be achieved to reduce the vibration energy of multiple specific frequency bands. It has the advantages of stable bearing performance and compact structural space, and can better meet the needs of engineering vibration reduction.

[0019] In the proposed same periodic vibration isolation unit structure, the resonant frequency of each level of the oscillator structure is different. The parameters of each level of the oscillator structure can be adjusted to make the resonant frequencies of adjacent oscillator structures close, thereby coupling multiple LR band gaps into a wide-band LR band gap, thereby improving the vibration wave attenuation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of the structure of an embedded multi-stage oscillator-type layered periodic vibration isolator provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the structure of a periodic vibration isolation unit embedded in a multi-stage oscillator-type layered periodic vibration isolator provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of the vibrator structure provided in an embodiment of the present application;

[0024] Figure 4 A schematic diagram of a Bragg-type periodic structure provided in an embodiment of the present application;

[0025] Figure 5 A comparison diagram of vibration transfer curves of an embedded multi-stage oscillator-type layered periodic vibration isolator and a traditional elastic vibration isolator provided in an embodiment of the present application, wherein the traditional elastic vibration isolator is a cylindrical elastic rubber block structure.

[0026] Description of reference numerals:

[0027] 1-Layered elastic block, 2-Layered mass block, 3-Elastic thin plate, 4-Annular mass block. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] like Figures 1 to 4 As shown, an embodiment of the present application provides an embedded multi-stage oscillator-type layered periodic vibration isolator, including at least two periodic vibration isolation unit structures connected in series; each periodic vibration isolation unit structure includes a Bragg-type periodic structure, and several levels of oscillator structures are embedded on the outer side of the Bragg-type periodic structure.

[0030] The Bragg-type periodic structure comprises: a layered elastic block 1 and a layered mass block 2 .

[0031] The vibrator structure includes an elastic thin plate 3 and an annular mass block 4 .

[0032] The layered elastic block 1 is connected in series with the layered mass block 2 . A plurality of elastic thin plates 3 are embedded in the outer side of the layered mass block 2 . An annular mass block 4 is fixedly connected to the outer periphery of each elastic thin plate 3 .

[0033] In the same periodic vibration isolation unit structure, the resonant frequency of each level of the oscillator structure is different.

[0034] Specifically, in this embodiment, the embedded multi-stage oscillator-type layered periodic vibration isolator includes three periodic vibration isolation unit structures connected in series, and a three-stage oscillator structure is embedded on the outside of each Bragg-type periodic structure, specifically, three elastic thin plates 3 are embedded on the outside of the layered mass block 2.

[0035] In this embodiment, in the same periodic vibration isolation unit structure, the parameters (inner diameter, outer diameter, height, etc.) of the elastic thin plate 3 and the annular mass block 4 of each level of the vibrator structure are different. The resonant frequency of the adjacent vibrator structure is adjusted by adjusting the structural parameters of the adjacent vibrators, so that the resonant frequency of each level of the vibrator structure is different.

[0036] Specifically, the greater the number of the periodic vibration isolation unit structures connected in series, the higher the attenuation rate of the LR band gap and the Bragg band gap of the embedded multi-stage oscillator-type layered periodic vibration isolator.

[0037] Exemplarily, the cross-sectional shape of the layered elastic block 1 and the layered mass block 2 is one of a circle and a polygon.

[0038] Specifically, in this embodiment, the cross-sectional shape of the layered elastic block 1 and the layered mass block 2 is circular, the layered elastic block 1 and the layered mass block 2 are connected in series to form a Bragg-type periodic structure, the layered elastic block 1 is an equivalent spring unit in the Bragg-type periodic structure, and the layered mass block 2 is an equivalent mass unit in the Bragg-type periodic structure. The starting frequency of the Bragg band gap generated by the Bragg-type periodic structure is determined by the resonant frequency of the layered elastic block 1 and the layered mass block 2, and a broadband Bragg band gap within a specific frequency can be formed by adjusting the material and structural parameters of the layered elastic block 1 and the layered mass block 2.

[0039] Exemplarily, the cross-sectional shape of the elastic thin plate 3 and the annular mass block 4 is one of a circular ring or a polygonal ring.

[0040] Specifically, in this embodiment, the cross-sectional shape of the elastic thin plate 3 and the annular mass block 4 is annular, the outer periphery of the elastic thin plate 3 is fixedly connected to the annular mass block 4, forming a primary vibrator structure, the elastic thin plate 3 is an equivalent spring unit in the vibrator structure, and the annular mass block 4 is an equivalent mass unit in the vibrator structure. The center frequency of the LR band gap generated by the vibrator structure is determined by the resonant frequency of the vibrator structure, and by adjusting the structural parameters of the elastic thin plate 3 and the annular mass block 4 so that the resonant frequencies of multiple vibrator structures are close, multiple LR band gaps can be coupled to generate a broadband LR band gap.

[0041] In this embodiment, the three-level oscillator structure generates three LR band gaps. When the resonance frequencies of the three-level oscillator structure are close, the three LR band gaps are coupled into a broadband LR band gap.

[0042] Exemplarily, the material of the layered elastic block 1 is a polymer damping material.

[0043] The polymer damping material includes: rubber, metal rubber and polyurethane.

[0044] Specifically, in this embodiment, the material of the layered elastic block 1 is rubber.

[0045] Exemplarily, the materials of the layered mass block 2, the elastic thin plate 3 and the annular mass block 4 are metal materials or composite materials with high density and high modulus characteristics.

[0046] Specifically, in this embodiment, the materials of the layered mass block 2 , the elastic thin plate 3 , and the annular mass block 4 are all made of steel.

[0047] like Figure 5 As shown in a possible embodiment, the vibration transmissibility of a layered periodic vibration isolator with embedded multi-stage oscillators (three periodic vibration isolation unit structures connected in series, with a three-stage oscillator structure embedded outside each Bragg-type periodic structure) of the present application is compared with that of a traditional elastic vibration isolator (the traditional elastic vibration isolator in this embodiment adopts a cylindrical elastic rubber block structure). Figure 5 It can be seen that the embedded multi-stage oscillator-type layered periodic vibration isolator of the present application has three LR band gaps in the low frequency range and a wider Bragg band gap in the medium and high frequency range.

[0048] The embedded multi-stage oscillator layered periodic vibration isolator of the present application belongs to passive vibration isolation technology. In engineering applications, it has strong vibration attenuation in multiple specific frequency bands, stable vibration reduction performance, good load-bearing performance, compact structure space, and low manufacturing cost. Through the design of structural parameters and material parameters of the vibration isolator, a specific frequency band LR band gap covering 100Hz-1000Hz and a Bragg band gap above 1000Hz can be obtained. Compared with commonly used passive vibration isolation equipment, it has more superior vibration reduction performance and has good application prospects and promotion value.

[0049] The embodiment of the present application embeds several levels of oscillator structures on the outside of the Bragg-type periodic structure and sets the resonant frequency of each level of the oscillator structure to be different, thereby realizing multiple LR band gaps and a wide-band Bragg band gap for reducing the vibration energy of multiple specific frequency bands. It has the advantages of stable bearing performance and compact structural space, and can better meet the needs of engineering vibration reduction.

[0050] In the proposed same periodic vibration isolation unit structure, the resonant frequency of each level of the oscillator structure is different. The parameters of each level of the oscillator structure can be adjusted to make the resonant frequencies of adjacent oscillator structures close, thereby coupling multiple LR band gaps into a wide-band LR band gap, thereby improving the vibration wave attenuation performance.

[0051] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0052] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An embedded multi-stage oscillator type layered periodic vibration isolator, characterized in that: It comprises at least two periodic vibration isolation unit structures connected in series; each periodic vibration isolation unit structure comprises a Bragg-type periodic structure, and a plurality of oscillator structures are embedded on the outer side of the Bragg-type periodic structure; The Bragg-type periodic structure comprises: a layered elastic block and a layered mass block; The vibrator structure comprises: an elastic thin plate and an annular mass block; The layered elastic block is connected in series with the layered mass block, a plurality of elastic thin plates are embedded in the outer side of the layered mass block, and an annular mass block is fixedly connected to the outer periphery of each elastic thin plate; In the same periodic vibration isolation unit structure, the resonant frequency of each level of the oscillator structure is different.

2. The embedded multi-stage oscillator layered periodic vibration isolator according to claim 1, characterized in that: The cross-sectional shape of the layered elastic block and the layered mass block is one of a circle and a polygon.

3. The embedded multi-stage oscillator layered periodic vibration isolator according to claim 1, characterized in that: The cross-sectional shape of the elastic thin plate and the annular mass block is one of a circular ring or a polygonal ring.

4. The embedded multi-stage oscillator layered periodic vibration isolator according to claim 1, characterized in that: The material of the layered elastic block is a kind of polymer damping material; The polymer damping material includes: rubber, metal rubber and polyurethane.

5. The embedded multi-stage oscillator layered periodic vibration isolator according to claim 1, characterized in that: The materials of the layered mass block, the elastic thin plate and the annular mass block are metal materials or composite materials with high density and high modulus characteristics.

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