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Multi-degree-of-freedom local resonance type super-damping composite structure

A local resonance and composite structure technology, applied in the direction of spring components, springs, springs/shock absorbers, etc. composed of several springs, can solve energy consumption, increased shear deformation of the damping layer, narrow low-frequency action frequency band, etc. question

Pending Publication Date: 2021-11-05
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common resonant dampers are usually composed of elastic damping material units and hard material mass units, which are mainly based on the design idea of ​​damping single-degree-of-freedom resonant absorbers. When applied to plate structures, they are usually installed in places with strong vibrations. The main disadvantages are that the frequency band of low-frequency action is narrow and the installation location selection requirements are high; free damping is realized by pasting a large area of ​​damping material on the surface of the substrate, and the operation is simple, but the effect is usually relatively weak, especially for low frequencies; constrained damping is in the A layer of constrained layer is added to the outer surface of the free damping, which increases the shear deformation of the damping layer and consumes more energy

Method used

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  • Multi-degree-of-freedom local resonance type super-damping composite structure
  • Multi-degree-of-freedom local resonance type super-damping composite structure
  • Multi-degree-of-freedom local resonance type super-damping composite structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Such as Figure 1-Figure 4 as shown,

[0067] In this embodiment, the multi-degree-of-freedom local resonance damping unit 2 includes a cylindrical neck structure unit 21 and a disc-shaped vibration unit 22 mounted on the neck structure unit 21, which is installed on the On one side surface of the substrate 1;

[0068] Preferably, the diameter of the vibration unit 22 is greater than or equal to the diameter of the neck structure unit.

[0069] In practice, multiple multi-degree-of-freedom local resonance damping units 2 using different materials / different geometric parameters can be used as a group, and then periodically distributed on the surface of the substrate 1 in units of groups.

[0070] The multi-degree-of-freedom local resonance damping unit 2 in this embodiment is made of a damping material with a single coefficient;

[0071] For the situation where more abundant resonance modes need to be introduced, two or more sets of parameter settings of the multi-deg...

Embodiment 2

[0073] Such as Figure 5-Figure 8 as shown,

[0074] In this embodiment, the multi-degree-of-freedom local resonance damping unit 2 includes a square column-shaped neck structure unit 21, and a cross-shaped vibration unit 22 installed on the neck structure unit 21;

[0075] By adopting the setting method of this embodiment, the size of a single direction can be increased under the same amount of material, and more low- and middle-frequency modes can be generated, thereby further improving the vibration damping effect of the corresponding frequency band.

Embodiment 3

[0077] Such as Figure 9-Figure 11 as shown,

[0078] Compared with Embodiment 1 and Embodiment 2, the multi-degree-of-freedom local resonance damping unit 2 is a short columnar structure; this arrangement only occupies a small space parallel to the surface of the substrate 1, but in the space perpendicular to the surface of the substrate 1, It has larger dimensions and is made of damping material.

[0079] In practical applications, considering that other equipment may be installed outside the structure of the base body 1, the damping unit cannot be completely guaranteed to be a straight line structure. At this time, a damping unit with a certain curved design or even a special-shaped design, such as an arc-shaped short column, can be used.

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Abstract

The invention relates to the technical field of damping vibration attenuation and noise reduction, and particularly discloses a multi-degree-of-freedom local resonance type super-damping composite structure. The structure comprises a base body and a damping piece installed on the surface of the base body, the damping piece comprises a plurality of multi-degree-of-freedom local resonance damping unit groups periodically distributed on the surface of the base body, and each multi-degree-of-freedom local resonance damping unit group comprises a plurality of multi-degree-of-freedom local resonance damping units. The structure is suitable for plate-shaped structures, shell-shaped structures and the like, and more efficient damping vibration attenuation can be achieved at a lower frequency band and a wider frequency band.

Description

technical field [0001] The invention relates to the technical field of damping, vibration reduction and noise reduction, and more specifically, relates to a multi-degree-of-freedom local resonance super-damping composite structure. Background technique [0002] Plate and shell structures are widely used in vehicles such as aircraft, ships, trains, and automobiles. Their acoustic characteristics have a direct impact on the internal noise environment. At the same time, strong vibrations caused by complex loads during the operation of related equipment will cause their own Fatigue failure, which in turn reduces structural life and can lead to safety concerns. Correspondingly, the development of vibration suppression technology for plate and shell structures has important positive significance, and damping vibration reduction is one of the technical solutions that has attracted widespread attention. [0003] Generally, the design of damping and vibration reduction can be divide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F3/087
Inventor 宋玉宝吴松岭刘祥梁勇王勇范正磊
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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