Five dB noise reduction for large medium speed diesel engines
Engine noise has becoming more and more important over years. Especially for maritime industry, the International Convention for the Safety of Life at Sea (SOLAS) launched new noise regulation since July 2014, which demands a maximum acceptable sound pressure level of 110 dB at any individual measurement position in the machinery space. Wärtsilä has a decade of experience on large medium speed diesel engine noise and vibration research and development. Today’s Wärtsilä is capable to technically reduce the engine noise level by 5 dB without any insulation panel even with increased engine power and higher fuel efficiency. This paper will explain in detail both the structure-borne noise and air-borne noise from an engine, from the source of excitation, transmission path and the structure noise radiation. Major noisy engine components that contributes the engine room noise level will be addressed, from both theoretical and experimental point of view. This paper will also explain the methodology of noise reduction on different engine noise sources. In the end, other important factors that matter with final engine room noise level will be pointed out.
Saine, K., and Gao, Z., 2016. Five dB noise reduction for large medium speed diesel engines. In Proceedings of Aachen Acoustics Colloquium.