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이도경(Lee, Do-Kyung),진봉만(Jin, Bong-Man),이철원(Lee, Cheul-Won),김노성(Kim, Nho-Sung),최수현(Choi, Su-Hyun) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.2
The exhaust noise of auxiliary engine in ships is directly transmitted to bridge wing with only distance attenuation. It is not easy to find out practical treatment to be applied between exhaust pipe and bridge wing to reduce the transmission of the exhaust noise. In general, therefore, a silencer is fitted to reduce the exhaust noise and correspondingly noise of bridge wing. The silencer should be properly designed under the consideration of the frequency component of the exhaust noise and the required performance such as noise reduction or insertion loss. In general, the gas inside the exhaust pipe flows with high temperature and speed and thus onboard test condition is more adverse than the standard atmospheric condition. In this study, the test method to evaluate silencer performance using a probe microphone is introduced.