Broad-band noise-reducing acoustic liner and its manufacture method

A manufacturing method and noise reduction technology, applied in the field of noise reduction, can solve problems such as inability to reduce noise

Inactive Publication Date: 2008-03-26
BEIHANG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

As we all know, in products such as aero-engines, there are not only pure-frequency di-level sub-acoustic sources caused by unsteady flows of specific frequencies, but also noise sources related to turbulence caused by flow states such as boundary layers and wakes, which usually correspond to The four-level sub-sound source has a very wide frequency range, and the noise frequency is relatively continuous. However, the existing acoustic lining cannot effectively reduce the noise of this continuous distribution of wide frequency range.

Method used

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  • Broad-band noise-reducing acoustic liner and its manufacture method
  • Broad-band noise-reducing acoustic liner and its manufacture method
  • Broad-band noise-reducing acoustic liner and its manufacture method

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0022] The embodiment of the present invention is mainly to fabricate randomly distributed anechoic holes whose size continuously changes within a certain range on the acoustic lining substrate, so that the acoustic lining can act on noise sources with continuous frequency distribution and a wide frequency range, and achieve continuous frequency control. Noise reduction for distributed noise sources over a wide frequency range.

[0023] Fig. 4 is the schematic diagram of the structure of the broadband noise-reducing lining of the embodiment of the present invention, there are noise-eliminating holes 402 of different sizes on the sound-lining substrate 401; the noise-eliminating holes 402 are circular through holes with different diameters; The diameter ...

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Abstract

The invention discloses a line to decrease noise for Broad Band and manufacture method. The sound line has the noise elimination hole which is distributed randomly and the size is changed continuously. So it can decrease the noise of broad frequency noise. Because of whole forming, it can not generate the noise dispersion phenomena caused by the sound line joint to influence the noise decreasing effect. In process of Broad Band noise decreasing line, it can get the noise frequency and corresponding noise intension by value simulation of test and get the size range, changing interface and density of noise elimination hole; also it distributes the hole on the sound line basal board to have the good noise decreasing effect.

Description

technical field [0001] The invention relates to the technical field of noise reduction, in particular to a broadband noise reduction lining and a manufacturing method thereof. Background technique [0002] At present, with the enhancement of human environmental protection awareness and the requirements for ride comfort, the requirements for noise pollution control of civil aircraft are becoming more and more stringent. The noise of civil aircraft mainly comes from the noise of the engine, so how to reduce the noise has become an important problem in the design of civil high bypass ratio turbofan engines. The noise of modern civilian high-bypass turbofan engines mainly includes fan noise and exhaust noise. The reduction of these noises is mainly achieved by selecting appropriate engine cycle parameters and advanced component noise reduction design technologies, including variable area nozzles , low-noise design of fans and low-pressure turbines, advanced acoustic liners and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/16F04D29/66F02K1/82
Inventor 徐力平邹正平刘火星
Owner BEIHANG UNIV
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