광대역 소음저감을 위한 다중사이드브랜치 배열 최적화에 대한 연구

초록

In modern society, noise problems occur because of various noise sources. Road noise is a representative noise source having a wide range of 500Hz~1600Hz. Sound absorbing materials are generally used as noise reduction measures for broadband noise, but this has side effects, such as risk to the human body and environmental problems (recycling). In this study, a side branch was applied as a noise reduction measure to replace sound absorbing materials. The principle of side branch is to reduce noise through destructive interference inducing a waveform of the opposite phase according to the structural shape with original noise. A side branch has a reduction effect at the narrow band only, but it is possible to reduce broadband noise by arranging multiple side branches. Multiple side branches were designed to reduce road noise and the 12-stage side branch arrangement was optimized through simulation and experiment. By applying this optimized design to the product (diffraction noise reducer), the noise reduction effect was confirmed to be improved from 3.1dB(A) to 4.1dB(A). We expect to apply multiple side branches to various noise reduction devices.

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