Design and Measurement of Dissipative Silencers for Noise Reduction of Large Maritime Gas Turbine Engines

해상용 대형 가스터빈의 소음 저감을 위한 흡음형 소음기의 설계 및 성능 측정

Based on ISO 7235, an experimental setup to measure the acoustic performance of splitter type dissipative silencers are fabricated. The length of each duct, sound source, microphone locations, modal filter, and anechoic termination are considered in the design of this setup. The modal filter is a particularly important factor because it affects the limit of measurement, which is also determined by the amount of flanking transmission of sound generated by the sound source to microphones. The effects of absorptive materials, media which covers the materials, and the number of splitters on the noise reduction of the sample silencers are experimentally investigated. The insertions loss of silencers with media and higher number of splitters increases, especially at higher frequencies.