A medium-low frequency sound-absorbing structural part and its preparation method

A structural part and sound-absorbing technology, applied in 3D object support structures, manufacturing tools, sound-generating devices, etc., can solve problems such as restricting application effects, and achieve the effects of facilitating large-scale production and application, short production cycle, and improving multiple reflections

Active Publication Date: 2022-06-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using it to absorb lower frequency sound waves, the structure needs to have a cavity depth of more than 20cm, which will significantly restrict its application effect

Method used

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  • A medium-low frequency sound-absorbing structural part and its preparation method
  • A medium-low frequency sound-absorbing structural part and its preparation method
  • A medium-low frequency sound-absorbing structural part and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Use 3ds max three-dimensional modeling software to build a cylinder with a diameter of 29mm and a height of 80mm, and then design the following polyline holes inside the cylinder, the diameter of which is 1.5mm, the bending angle of the polyline hole is 40°, and the polyline The number of holes is 18, and the perforation rate is 14.08%.

[0033] 2) Polylactic acid (PLA) filament printing consumables with a diameter of 1.75mm were manufactured by extrusion molding equipment; PLA powder and toughening agent were prepared and mixed uniformly in a mass ratio of 9:1; the above mixed raw materials were at 30 ℃ After drying for 2 hours, pour it into the feeding port of the extrusion equipment, heat the raw material to a molten state, and push the molten raw material to extrude the wire from the extrusion head through the rotation of the screw. The rotation speed was 45 r / min, and the diameter of the extrusion head was 1.75 mm.

[0034] 3) Use a 3D printer to process and sh...

Embodiment 2

[0043] 1) Use 3ds max three-dimensional modeling software to build a cylinder with a diameter of 29mm and a height of 80mm, and then design the following polyline hole inside the cylinder, the hole diameter of which is 1.5mm, the bending angle of the polyline hole is 50°, and the polyline The number of holes is 18, and the perforation rate is 11.39%.

[0044] 2) Polypropylene (PP) filament printing consumables with a diameter of 1.75mm are manufactured by extrusion molding equipment; PP powder and toughening agent are configured and mixed uniformly according to the mass ratio of 9.6:0.4; the above mixed raw materials are at 40 ℃ After drying for 3 hours, pour it into the feed port of the extrusion equipment, heat the raw material to a molten state, and push the molten raw material to extrude the wire from the extrusion head through the rotation of the screw. The rotation speed was 65 r / min, and the diameter of the extrusion head was 1.75 mm.

[0045] 3) Use 3D printer to proc...

Embodiment 3

[0049] 1) Use 3ds max three-dimensional modeling software to build a cylinder with a diameter of 29mm and a height of 80mm, and then design the following polyline holes inside the cylinder, where the hole diameter is 1.5mm, the bending angle of the polyline hole is 60°, and the polyline The number of holes is 18, and the perforation rate is 9.63%.

[0050] 2) Polycarbonate (PC) filamentary printing consumables with a diameter of 1.75mm are manufactured by extrusion molding equipment; PC powder and toughening agent are configured and mixed uniformly according to the mass ratio of 9.2:0.8; The above mixed raw materials are at 50 After drying at ℃ for 3 hours, pour it into the feed port of the extrusion equipment, heat the raw material to a molten state, and push the molten raw material to extrude the wire from the extrusion head through the rotation of the screw. The rotation speed is 50r / min, and the diameter of the extrusion head is 1.75mm.

[0051] 3) Use a 3D printer to pro...

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Abstract

The invention discloses a middle-low frequency sound-absorbing structural part and a preparation method thereof, comprising a structural part formed by fused deposition 3D printing of a polymer material, and a plurality of perforations for absorbing middle-low frequency sound waves are arranged in the structural part; The cross-section of the perforation is sawtooth. Three-dimensional modeling software is used to design the aperture, angle and number of multi-level perforations inside the sound-absorbing structure; at the same time, polymer filament printing consumables are manufactured through extrusion molding equipment, and finally the filament filaments are used as raw materials for processing and molding by 3D printers Sound-absorbing structural parts with different oblique angles and series are produced. The structure of the present invention can improve the reflection of sound waves inside the material and enhance the sound absorption performance. The preparation method is simple and easy, and the production cycle is short. By adjusting the characteristic parameters such as perforation rate, aperture size, inclination angle and oblique penetration series , can effectively control the frequency and intensity of the resonant sound absorption peak, and obtain a sound-absorbing structure with excellent performance in the middle and low frequencies, which is convenient for large-scale production and application.

Description

technical field [0001] The invention belongs to a sound-absorbing component and a preparation method, in particular to a medium-low frequency sound-absorbing structural component with multi-level inclined holes prepared by fused deposition molding 3D printing. Background technique [0002] Noise pollution, as a kind of physical pollution, widely exists in construction sites, automobiles and high-speed railways, etc., causing serious harm to human life. Heavy. According to the different sound-absorbing mechanisms, sound-absorbing materials can be divided into two categories: resonant sound-absorbing structural materials and porous sound-absorbing materials. There are many microscopic pores in the porous sound absorbing material directly through the surface of the material or there are many interconnected air bubbles inside, which can convert sound energy into heat energy and dissipate it due to viscosity and thermal conduction effects. Porous sound-absorbing materials have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C64/124B29C64/393B29C64/295B29C64/20B29C64/30B33Y30/00B33Y40/00B33Y50/00G10K11/16
CPCB29C64/124B29C64/393B29C64/295B29C64/20B29C64/30B33Y30/00B33Y40/00B33Y50/00G10K11/16
Inventor 刘初阳方罡杨赟彭康森曹宇凡江涛钱祺
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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