자동차 배기 소음 저감을 위한 환상형 소음기 (A Muffler of Annulus Type for Automotive Exhaust Noise Reduction)

서지정보

· 발행기관 : 한국환경기술학회
· 수록지 정보 : 한국환경기술학회지 / 15권 / 3호 / 204 ~ 210페이지
· 저자명 : 김병삼, 김형두

초록

자동차 엔진은 환경오염의 주 원인중 하나이기 때문에 전 세계적으로 배기가스로 인한 피해를 최소화하기 위한 기술이 필요하다. 특히, 배기가스는 자동차 소음기로 배출되고 배기소음은 주변 환경에 매우 유해하다. 배기소음을 저감하기 위하여 자동차 소음기는 최적으로 배출 효율을 가질 수 있도록 설계되어야 한다. 본 연구에서는 배기가수 소음, 소음분포 특성, 배기가스의 압력과 온도에 대하여 공냉 환상형 자동차 소음기의 온도를 변화시키면서 조사하였다. 자동차 소음기의 주파수 해석으로 부터 소음분포는 1,000~2,000Hz 대역이고, 소음저감은 환상 온도에 영향을 받고 있음을 알 수 있었다.

영어초록

Internal combustion engine is the main source of environmental pollutants and therefore advanced technology is required to reduce harmful elements from the exhaust gases all over the world. Especially, when the exhaust gas is released from the automotive muffler, exhaust noise has many bad influence on the surrounding environment. In order to reduce the exhaust noise, it is necessary that automotive muffler must be designed for best exhaust efficiency. The sound insulation room was installed for the analysis of an acoustics characteristics of the noise from automotive muffler, in this study. Exhaust gas noise, noise distribution characteristics, pressure and temperature of exhaust gas were investigated with the change of annulus temperature of air cooled annulus automotive muffler and cooled annulus automotive muffler. The following results were obtained with this study. From the frequency analysis of automotive muffler, high noise distribution was observed in the range 100~2,000Hz. It means that the noise in this range has an dominate influence for the overall noise. Noise reduction of automotive muffler was affected by the temperature of annulus. It is caused the result that the high temperature and pressure of exhaust gas are changed lower by the drop of annulus temperature. The tendencies of noise, the temperature and pressure of exhaust gas are similar to the performance curve of engine. Exhaust gas pressure is determined by the revolution per minute of engine and affected by the cooling performance of automotive muffler.

참고자료

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