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Counter bore type micro-perforated plate applied to water medium, micro-perforated sound absorption structure and sound absorption coefficient calculation method of micro-perforated sound absorption structure

A technology of micro-perforated plate and sound absorption coefficient, which is applied in the direction of sound-emitting devices and instruments, can solve the problems of high sound absorption frequency, long sound wave wavelength, and difficulty in achieving sound absorption effect, and achieve good adaptability, easy processing, and calculation results Accurate and reliable results

Active Publication Date: 2021-03-19
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different from the air medium, the characteristic acoustic impedance of water is not much different from the acoustic impedance of commonly used engineering structural materials (metal materials and plastics, etc.), especially in the case of thinner micro-perforated plates, the structural-acoustic characteristics of micro-perforated plates and water media The coupling effect is more obvious, which makes it difficult for the traditional micro-perforated sound-absorbing structure to achieve the sound-absorbing effect due to insufficient impedance. At the same time, due to the long wavelength of sound waves in the water medium, the sound-absorbing frequency of the traditional rigid-backed micro-perforated sound-absorbing structure is relatively high. Therefore, sound-absorbing structures suitable for air are not suitable for water media

Method used

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  • Counter bore type micro-perforated plate applied to water medium, micro-perforated sound absorption structure and sound absorption coefficient calculation method of micro-perforated sound absorption structure
  • Counter bore type micro-perforated plate applied to water medium, micro-perforated sound absorption structure and sound absorption coefficient calculation method of micro-perforated sound absorption structure
  • Counter bore type micro-perforated plate applied to water medium, micro-perforated sound absorption structure and sound absorption coefficient calculation method of micro-perforated sound absorption structure

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Experimental program
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Effect test

Embodiment 1

[0060] see figure 1 , figure 2 with Figure 4 The counterbore micro-perforated plate of the present invention includes a plate body 1, and a plurality of through-hole perforation units are opened on the plate body 1. Microperforations with connected bottoms3. The plate body 1 is made of stainless steel or cupronickel; preferably, considering the machinability, the diameter of the counterbore is not less than 1mm, and the depth of the counterbore 2 is 5-20mm; the diameter of the micro-perforation is 0.02 -0.4mm. The bottom surface of counterbore 5 is plane in the present embodiment, see image 3 , according to the needs of processing, the bottom surface of the counterbore 5 can also be a tapered surface;

[0061] The microperforations 3 on the same plate body have the same or different hole diameters and the same or different hole depths. In this example figure 1 The hole depth and diameter of the micro-perforation 3 are the same, Figure 4 The micro-perforated holes 3...

Embodiment 2

[0063] see Figure 5 , in this embodiment, the perforation unit includes corresponding upper sinkholes 2.1 and lower sinkholes 2.2 located on both sides of the plate body, and micro-perforation holes 3 whose two ends communicate with the bottoms of the upper and lower sinkholes 2.1 and 2.2 respectively. All the other are with embodiment 1.

Embodiment 3

[0065] see Image 6 , In this embodiment, the micro-perforations described in this embodiment have two different hole depths, and the rest are the same as in Embodiment 1.

[0066] Example 1 of micro-perforated sound-absorbing structure applied in water medium:

[0067] see Figure 7 The sound absorbing structure of the present invention consists of the counterbore micro-perforated plate 4 and the back plate 6 described in Embodiment 1, and the cavity structure 7 surrounded by the side plates 5 is between the counter-hole micro-perforated plate 4 and the back plate 6 , the preferred backplane thickness is 0.2-10mm.

[0068] Calculation method of sound absorption coefficient of micro-perforated sound-absorbing structure in water medium:

[0069] The equivalent circuit of the sound-absorbing structure of the micro-perforated plate was established by using the acoustic-electric analogy method (such as Figure 8 shown), wherein the micro-perforated plate is connected in series...

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Abstract

The invention discloses a counter bore type micro-perforated plate applied to a water medium, a micro-perforated sound absorption structure and a sound absorption coefficient calculation method of themicro-perforated sound absorption structure. The counter bore type micro-perforated plate comprises a plate body, a plurality of through perforating units are formed in the plate body, and each perforating unit comprises a counter bore at least located in the plate body on one side and a micro-perforated hole communicated with the bottom of the counter bore. The micro-perforated sound absorptionstructure comprises a counter bore type micro-perforated plate and a back plate, wherein a cavity structure defined by side plates is arranged between the micro-perforated plate and the back plate. The counter bore type micro-perforated plate is simple in structure, easy to machine, good in rigidity, flexible and adjustable in sound absorption frequency range and good in adaptability. The micro-perforated sound absorption structure applied to the water medium is particularly suitable for sound absorption treatment in the water medium. According to the sound absorption coefficient calculation method, the structural-acoustic coupling effect between the structure and the water medium is considered, the requirement for calculating the sound absorption coefficient of the micro-perforated soundabsorption structure in the water medium can be met, and the calculation result is more accurate and reliable.

Description

technical field [0001] The invention relates to the field of water medium sound absorption, in particular to a sinking-hole type micro-perforated plate, a micro-perforated sound-absorbing structure, and a method for calculating the sound absorption coefficient of the micro-perforated sound-absorbing structure applied in the water medium. Background technique [0002] The micro-perforated sound-absorbing structure is often used in the field of noise control in the air medium. The micro-perforated plate mainly has multiple micro-perforated holes on the thin plate, forming a sound-absorbing structure with the back cavity, and using the viscous loss of the air medium in the micro-perforated holes to achieve Sound absorption effect. Usually the diameter of the micro-perforation is at the silk meter level, and the micro-perforation plate is made of non-metallic or metal material. Due to the limitation of the micro-perforation process, the existing micro-perforation hole depth is l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162
CPCG10K11/162
Inventor 朱海潮侯九霄赵应龙袁苏伟廖金龙
Owner NAVAL UNIV OF ENG PLA
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