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조합형 소음기를 이용한 육상발전용 디젤 엔진의 흡기 소음 제어
송근복(Keun-Bok Song),주원호(Won-Ho Joo),김동해(Dong-Hae Kim) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.4
Turbo-charger noise radiated from air intake part is one of the most important noise sources in diesel power plant. In this paper, intake noise control of the diesel power plant was studied using parallel baffle type silencer and concentric hole-cavity resonator simultaneously. Firstly, acoustical characteristics and attenuation performance for parallel baffle type silencer were investigated through theoretical approach and experimental method. Based on the results, optimal design of the parallel baffle silencer was suggested. Secondly, for reducing the low frequency noise contained in the intake noise, the concentric hole-type resonator was developed and the acoustic performance was verified from the test. By combining two types of silencers, it is expected that the overall insertion loss is about 50 dB. So, the combined silencer is very helpful in reducing the intake noise of diesel power plant.
흡음형과 공명형 덕트 소음기의 소음저감 성능에 관한 실험적 고찰
이영섭(Young-Sup Lee),정광섭(Kwang-Seop Chung),이동훈(Dong-Hoon Lee) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.12
A silencer has been widely used for the purpose of suppressing the noises propagated from duct of air conditioning system. The absorption type silencer is usually applied to reduce the noise with high frequency bandwidth. On the order hand, the resonance type silencer is applied to reduce the noise with low-middle frequency bandwidth. The insertion loss of silencer is measured in the reverberation room. The cut-off frequency of reverberation room is 100 ㎐. The insertion loss of absorption type silencer is more larger than that for resonance type silencer regardless of changing the flow velocity.
조합형 소음기를 이용한 박용 디젤 엔진 배기 소음 제어
이태경(Lee, Tae-Kyoung),주원호(Joo, Won-Ho),배종국(Bae, Jong-Gug) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.7
Low frequency exhaust noise of marine diesel engine is one of the most important noise sources in vessels. However, conventional absorptive silencers are ineffective to control exhaust noise because of low absorption in the low frequency range. In the paper, exhaust noise control of marine diesel engine was studied by using the hybrid silencer, which was composed of virtually divided array of concentric hole-cavity resonators and conventional absorptive silencer. A series of tests including field tests were performed to investigate the acoustic performance of the hybrid silencer. Consequently, its high performance of 5${\sim}$10 dB noise reduction in the low frequency range was confirmed and it is expected to be very helpful in reducing the exhaust noise of marine diesel engine.