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Multi-cavity direct-through dual-layer perforating silencer capable of eliminating wide-band noise

A muffler, double-layer technology, applied in the direction of intake muffler, machine/engine, pipe/pipe joint/pipe fitting, etc. The effect of compact structure and large noise reduction

Inactive Publication Date: 2017-06-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the multi-cavity straight-through perforated muffler has a compact structure, its muffler amplitude and frequency band are limited when the number of cavities is small

Method used

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  • Multi-cavity direct-through dual-layer perforating silencer capable of eliminating wide-band noise
  • Multi-cavity direct-through dual-layer perforating silencer capable of eliminating wide-band noise
  • Multi-cavity direct-through dual-layer perforating silencer capable of eliminating wide-band noise

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: The parameters of the multi-cavity inserted tube-type double-layer perforated muffler for eliminating supercharged intake broadband noise are shown in Table 1:

[0038]

[0039] The transmission loss of this muffler is as Figure 4 As shown, the noise reduction frequency range of the example muffler is approximately 1500-3500Hz, and the noise reduction amplitude is relatively high. The total length is only 100mm, the outer diameter is 80mm, and the structure is compact, which is very suitable for broadband noise control of the supercharged intake system.

Embodiment 2

[0040] Embodiment 2: The parameters of the multi-cavity inserted tube-type double-layer perforated muffler used to eliminate the broadband noise of pressurized air intake, other parameters remain unchanged, only the length ratio of each double-layer perforated tube is changed, as shown in Table 2 :

[0041]

[0042] Such as Figure 5 Shown is the effect of each cavity length ratio on the acoustic performance of the muffler. The length of the cavity is kept at 100mm, and the porosity of the middle cavity is kept at 10%. It can be seen that the length of the cavity has a great influence on the transmission loss amplitude and peak frequency of the muffler. In actual engineering design, a reasonable matching design is required to obtain Ideal muffler acoustics.

Embodiment 3

[0043]Embodiment 3: The parameters of the multi-cavity inserted tube-type double-layer perforated muffler used to eliminate the broadband noise of pressurized air intake are unchanged, and only the porosity ratio of each double-layer perforated tube is changed, as shown in Table 3. Show:

[0044]

[0045] Such as Figure 6 Shown is the effect of the porosity ratio of each cavity on the acoustic performance of the muffler. The length of the cavity is kept at 100mm, and the length of each double-layer perforated tube is 40mm; The ideal acoustic characteristics of the muffler can only be obtained through reasonable matching design.

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Abstract

The invention provides a multi-cavity direct-through dual-layer perforating silencer capable of eliminating wide-band noise. The multi-cavity direct-through dual-layer perforating silencer capable of eliminating the wide-band noise comprises an inlet end, a silencer body and an outlet end. At least two dual-layer perforating pipes are arranged in the silencer body. The dual-layer perforating pipes are connected in series and separated through partition plates. Each dual-layer perforating pipe comprises an outer pipe body and an inner pipe body, wherein through holes are distributed in the outer pipe body and the inner pipe body, a closed cavity is defined by the outer pipe body, the silencer body and the corresponding partition plate, and another closed cavity is defined by the inner pipe body, the outer pipe body and the corresponding partition plate. The silencer has the advantages that airflow circulates directly from the inlet end to the outlet end, the pressure loss is low, the size is small, the structure is simple, cost is low, and by designing the structure parameters through a multi-cavity one-dimension transfer matrix method, the high-amplitude and wide-band silencing effect can be achieved.

Description

technical field [0001] The invention relates to the field of broadband mufflers, and specifically provides the technical field of a multi-cavity straight-through double-layer perforated muffler capable of eliminating broadband noise. Background technique [0002] In engineering, the frequency distribution of pipeline noise is very wide, especially for the pressurized intake system, it is dominated by medium and high broadband noise components, and for this kind of broadband noise control, only by taking measures from the noise source itself, its reduction The amount of noise is limited. As for pipeline active noise control, the technology is immature, the device is complicated, the cost is high, and the frequency of noise control is limited. Therefore, installing mufflers in pipelines is one of the most economical and effective measures to control pipeline noise. Traditional resistant mufflers (expansion muffler, Helmholtz cavity or 1 / 4 wavelength tube, etc.) can only redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M35/12F16L55/033
CPCF02M35/1211F02M35/1216F16L55/033
Inventor 郭荣唐文博
Owner TONGJI UNIV
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