The use of silencers to reduce noise is mandatory due to severe hearing damage caused by high venting noise in the engine room of ocean-going vessels. While straight and perforated tubes have been used as acoustical elements in traditional silencer design, studies have shown that the acoustical design still requires improvement. To enhance acoustical efficiency, the use of multi-chamber mufflers is proposed composed of screw and perforated tubes. Additionally, a mathematical finite element model built for acoustical simulation using the COMSOL program expedites the analysis of silencers with complicated acoustical elements. A sensitivity analysis of transmission loss concerning the geometric factors of two-chamber and three-chamber silencers is conducted to investigate the relationship between sound transmission loss and silencer shape. The results demonstrate that the multi-chamber silencer with screw tubes and straight perforated tubes performs well in reducing noise.
Lan, Tian-Syung and Chiu, Min-Chie
"Multi-chamber Silencer Composed of Screw-perforated Tubes and Straight-perforated Tubes,"
Journal of Marine Science and Technology: Vol. 31:
2, Article 3.
Available at: https://jmstt.ntou.edu.tw/journal/vol31/iss2/3