CN115750659A - Periodic structure composite material low-frequency vibration reduction and isolation support - Google Patents
Periodic structure composite material low-frequency vibration reduction and isolation support Download PDFInfo
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- CN115750659A CN115750659A CN202211499236.5A CN202211499236A CN115750659A CN 115750659 A CN115750659 A CN 115750659A CN 202211499236 A CN202211499236 A CN 202211499236A CN 115750659 A CN115750659 A CN 115750659A
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- frequency vibration
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Abstract
The invention discloses a periodic structure composite material low-frequency vibration reduction and isolation support which comprises flanges positioned at two ends and used for external connection and a periodic structure shell positioned in the middle; the periodic structure shell comprises at least two same periodic units which are arranged along the axial direction, each periodic unit comprises at least one unit cell which is arranged along the axial direction, each unit cell comprises a circular shell, a viscoelastic damping layer and a resonance body, the viscoelastic damping layer is made of viscoelastic damping materials and located between adjacent circular shells, and the resonance body is made of high-density materials and arranged on the viscoelastic damping layer. The local resonance band gap mechanism and the damping vibration attenuation technology are applied to the vibration attenuation and isolation support, so that the vibration attenuation and isolation support has better low-frequency vibration attenuation and isolation performance and wide application range.
Description
Technical Field
The invention belongs to the field of vibration control, and particularly relates to a periodic structure composite material low-frequency vibration reduction and isolation support.
Background
The problems of low-frequency vibration reduction and noise reduction exist in the fields of aerospace, ships, rail transit and the like. The support is a bearing part indirectly contacted with the vibration source equipment, and the vibration damping and vibration isolation performance of the support is a way for solving the problems of vibration damping and noise reduction. Although the conventional vibration reduction and isolation support adopts a periodic structure to perform passive vibration reduction, low-frequency elastic waves have the characteristics of difficult attenuation and strong penetrating capability, the periodic structure based on the Bragg scattering band gap theory needs to increase the structure size to generate a low-frequency band gap, and the spatial layout of the support is limited, so that the conventional vibration reduction and isolation support is difficult to apply to low-frequency vibration reduction.
Disclosure of Invention
The invention aims to provide a periodic structure composite material low-frequency vibration reduction and isolation support, which applies a local resonance band gap mechanism and a damping vibration reduction technology to the vibration reduction and isolation support, has better low-frequency vibration reduction and isolation performance and wide application range.
The technical scheme adopted by the invention is as follows:
a periodic structure composite material low-frequency vibration reduction and isolation support comprises flanges which are positioned at two ends and used for external connection and a periodic structure shell positioned in the middle; the periodic structure shell comprises at least two same periodic units which are arranged along the axial direction, each periodic unit comprises at least one unit cell which is arranged along the axial direction, each unit cell comprises a circular shell, a viscoelastic damping layer and a resonant body, each viscoelastic damping layer is made of a viscoelastic damping material and located between adjacent circular shells, and each resonant body is made of a high-density material and is arranged on each viscoelastic damping layer.
Preferably, when the periodic unit adopts more than two unit cells, the layering angle and height of the cylindrical shell of each unit cell, the thickness and material of the viscoelastic damping layer and the size shape and material of the resonance body are different.
Preferably, the cylindrical shell is made of carbon fiber composite.
Preferably, the viscoelastic damping layer is made of nitrile rubber or polyurethane.
Preferably, the viscoelastic damping layer is adhesively connected to the cylindrical housing.
Preferably, the resonant body is made of lead.
Preferably, the resonator body has a plate shape and a circular or polygonal outer shape.
Preferably, the resonator body is located centrally in the viscoelastic damping layer.
Preferably, the resonator body is adhesively bonded to the viscoelastic damping layer.
The invention has the beneficial effects that:
the invention applies the local resonance band gap mechanism and the damping vibration attenuation technology to the vibration attenuation and isolation support to form the vibration attenuation and isolation support with the local resonance type periodic structure, wherein the viscoelastic damping layer and the resonance body form a vibration attenuation structure; the invention can formulate the support adapting to different vibration-damping frequency bands according to different excitation frequencies, realize vibration damping and isolation of specific frequency bands by adjusting the size and the fiber laying sequence of the cylindrical shell, the quality and the rigidity of the vibration-absorbing structure consisting of the viscoelastic damping layer and the resonance body, the number of the periodic units and the number of the unit cells in the periodic units, and has wide application range.
Drawings
Fig. 1 is a cross-sectional view of a periodic structure composite low frequency vibration damping mount in accordance with an embodiment of the present invention.
Fig. 2 is a cross-sectional view of a periodic structure composite low frequency vibration damping and isolating mount in accordance with a second embodiment of the present invention.
FIG. 3 is a graph of the vibration transmission characteristics of the periodic structure composite low frequency vibration damping and isolating support in accordance with one embodiment of the present invention.
In the figure: 1-a periodic structure shell; 2-a flange; 3-a periodic unit; 301-unit cell; 30101-a cylindrical housing; 30102 a viscoelastic damping layer; 30103-a resonator; 302-unit cell; 30201-cylindrical shell; 30202-a viscoelastic damping layer; 30203-resonator.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1 to 2, in the first and second embodiments, the periodic structure composite material low frequency vibration reduction and isolation support includes flanges 2 for external connection at both ends and a periodic structure housing 1 in the middle; the periodic structure shell 1 comprises at least two identical periodic units 3 arranged along the axial direction (in the first embodiment, the periodic structure shell 1 comprises three periodic units 3, in the second embodiment, the periodic structure shell 1 comprises two periodic units 3, actually, four, five and the like), the periodic units 3 comprise at least one unit cell arranged along the axial direction (in the first embodiment, the periodic units 3 only have one unit cell, which is the unit cell 301, in the second embodiment, the periodic units 3 have two unit cells, which are the unit cell 301 and the unit cell 302, actually, three, four and the like), each basic structure is the same, taking the unit cell 301 as an example, and comprises a circular shell 30101, a viscoelastic damping layer 30102 and a resonator 30103, the viscoelastic damping layer 30102 is made of a viscoelastic damping material and is located between the adjacent circular shells 30101, and the resonator 30103 is made of a high-density material and is arranged on the viscoelastic damping layer 30102; the flanges 2 at the two ends are connected with a base or a machine equipment connecting plate through bolts.
In the invention, when more than two single cells are adopted by the periodic unit 3, the layering angle and height of the cylindrical shell of each single cell, the thickness and material of the viscoelastic damping layer and the size, shape and material of the resonance body are all different; for example, in the second embodiment, the lay angle and height of the circular case 30101 of the unit cell 301, the thickness and material of the viscoelastic damping layer 30102, and the size shape and material of the resonator 30103 are different from those of the circular case 30201 of the unit cell 302, the thickness and material of the viscoelastic damping layer 30202, and the size shape and material of the resonator 30203.
In the present invention, it is preferable that the cylindrical housing employs a carbon fiber composite material (e.g., M40J, SYM40, etc.).
In the invention, preferably, the viscoelastic damping layer is made of viscoelastic damping materials such as nitrile rubber and polyurethane, and the viscoelastic damping layer is connected with the cylindrical shell in a bonding manner.
In the invention, preferably, the resonance body is made of high-density materials such as lead, the resonance body is plate-shaped and is circular or polygonal in shape, the resonance body is positioned in the center of the viscoelastic damping layer, and the resonance body is connected with the viscoelastic damping layer in a gluing mode.
In the first embodiment, the cylindrical casing 30101 is made of SYM40, the viscoelastic damping layer 30102 is made of rubber, the resonant body 30103 and the flange are made of lead, and the flange is made of Q235; the height of the support is 140mm; the diameter of the flange is 180mm, and the height of the flange is 10mm; the cylindrical shell 30101 has a wall thickness of 5mm, an inner diameter of 45mm, a height of 38mm, a thickness of 2mm and a diameter of 50mm of the viscoelastic damping layer 30102; the resonance body 30103 has a diameter of 25mm and a thickness of 2mm; as shown in fig. 3, the vibration damping and isolating support of the periodic structure composite material of the first embodiment has a vibration transmission characteristic curve obtained by using the equation of amplitude-frequency response function T =20log (p) 2 /p 1 ) Calculating the vibration attenuation decibel, p in the frequency domain 1 Is a physical quantity (displacement, velocity, acceleration) of the excitation end, p 2 Physical quantities (displacement, velocity, acceleration) of the response end; in the first embodiment, two band gaps exist within 0-200Hz, the frequency of the first band gap is 80-100 Hz, the frequency of the second band gap is 130-160Hz, and the vibration amplitude is rapidly attenuated within the frequency band.
The invention applies the local resonance band gap mechanism and the damping vibration attenuation technology to the vibration attenuation and isolation support to form the vibration attenuation and isolation support with the local resonance type periodic structure, wherein the viscoelastic damping layer and the resonance body form a vibration attenuation structure; the invention can formulate the supports adapting to different vibration reduction frequency bands according to different excitation frequencies, realize the vibration reduction and vibration isolation of specific frequency bands by adjusting the size and the fiber laying sequence of the cylindrical shell, the quality and the rigidity of the vibration absorption structure consisting of the viscoelastic damping layer and the resonance body, the number of the periodic units and the number of the unit cells in the periodic units, and has wide application range.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (9)
1. The utility model provides a cycle structure combined material low frequency subtracts vibration isolation support which characterized in that: the device comprises flanges which are positioned at two ends and used for external connection and a periodic structure shell positioned in the middle; the periodic structure shell comprises at least two same periodic units which are arranged along the axial direction, each periodic unit comprises at least one unit cell which is arranged along the axial direction, each unit cell comprises a circular shell, a viscoelastic damping layer and a resonant body, each viscoelastic damping layer is made of a viscoelastic damping material and located between adjacent circular shells, and each resonant body is made of a high-density material and is arranged on each viscoelastic damping layer.
2. The periodic structure composite low frequency vibration damping and isolating mount of claim 1, wherein: when the periodic unit adopts more than two unit cells, the layering angle and height of the cylindrical shell of each unit cell, the thickness and material of the viscoelastic damping layer and the size shape and material of the resonant body are all different.
3. The periodic structure composite low frequency vibration damping and isolating mount as claimed in claim 1 or 2, wherein: the cylindrical shell is made of carbon fiber composite materials.
4. The periodic structure composite low frequency vibration damping and isolating mount as claimed in claim 1 or 2, wherein: the viscoelastic damping layer is made of nitrile rubber or polyurethane.
5. The periodic structure composite low frequency vibration damping and isolating mount as claimed in claim 1 or 2, wherein: the viscoelastic damping layer is connected with the cylindrical shell in a gluing way.
6. The periodic structure composite low frequency vibration damping and isolating mount as claimed in claim 1 or 2, wherein: the resonance body is made of lead.
7. The periodic structure composite low frequency vibration damping and isolating mount as claimed in claim 1 or 2, wherein: the resonance body is plate-shaped and has a circular or polygonal shape.
8. The periodic structure composite low frequency vibration damping and isolating mount as claimed in claim 1 or 2, wherein: the resonator body is located in the center of the viscoelastic damping layer.
9. The periodic structure composite low frequency vibration damping and isolating mount as claimed in claim 1 or 2, wherein: the resonance body is connected with the viscoelastic damping layer in a bonding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211499236.5A CN115750659A (en) | 2022-11-28 | 2022-11-28 | Periodic structure composite material low-frequency vibration reduction and isolation support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211499236.5A CN115750659A (en) | 2022-11-28 | 2022-11-28 | Periodic structure composite material low-frequency vibration reduction and isolation support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115750659A true CN115750659A (en) | 2023-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211499236.5A Pending CN115750659A (en) | 2022-11-28 | 2022-11-28 | Periodic structure composite material low-frequency vibration reduction and isolation support |
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| Country | Link |
|---|---|
| CN (1) | CN115750659A (en) |
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2022
- 2022-11-28 CN CN202211499236.5A patent/CN115750659A/en active Pending
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