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

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 ...

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