Multi-cavity insert tube type double-layer perforated silencer capable of eliminating broadband noise of supercharging air intake system

A technology of supercharged air intake and muffler, which is applied in the direction of intake muffler, charging system, machine/engine, etc. The effect of noise reduction amplitude and pressure loss is small

Inactive Publication Date: 2017-06-27
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 insert tube type double-layer perforated silencer capable of eliminating broadband noise of supercharging air intake system
  • Multi-cavity insert tube type double-layer perforated silencer capable of eliminating broadband noise of supercharging air intake system
  • Multi-cavity insert tube type double-layer perforated silencer capable of eliminating broadband noise of supercharging air intake system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 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:

[0039]

[0040] 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

[0041] 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 are kept constant, and only the length ratio of each double-layer perforated tube is changed, as shown in Table 2 :

[0042]

[0043] 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

[0044] 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:

[0045]

[0046] 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 relates to a multi-cavity insert tube type double-layer perforated silencer capable of eliminating broadband noise of a supercharging air intake system. The silencer comprises an inlet end, silencer main bodies and an outlet end. The silencer main bodies are internally provided with at least two double-layer perforated tubes. All the double-layer perforated tubes are connected in series and partitioned through partition plates. Each double-layer perforated tube comprises an outer tube body and an inner tube body which are provided with perforated holes, the outer tube bodies, the corresponding silencer main body and the corresponding partition plate form a closed cavity, the inner tube body extends from the inlet side to the outlet side, and the inner tube body, the corresponding outer tube body and the corresponding partition plate form an unclosed cavity. The silencer is low in pressure loss, compact in structure and low in manufacturing cost, and structural parameters are designed through a multi-cavity one-dimensional transfer matrix method to achieve the high-amplitude broadband silencing effect.

Description

technical field [0001] The invention relates to the field of broadband mufflers, and specifically provides a multi-cavity insertion tube type double-layer perforated muffler for eliminating pressurized intake broadband noise. Background technique [0002] The boosted intake system includes the turbocharged intake system of the car, the boosted intake system of the fan and the boosted intake system of the air compressor. The intake noise frequency distribution of this type of supercharged intake system is very wide, and it is dominated by high-frequency components. As far as intake noise control is concerned, only by taking measures from the noise source itself, the amount of noise reduction is limited. And may affect the performance of the supercharged intake system. As for active noise control, the technology is immature, the device is complicated and the cost is high, and the applicable noise reduction frequency range is also narrow. Installing a muffler to the boost int...

Claims

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Application Information

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