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Tuesday, July 9 • 10:50 - 11:10

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Lightweight composite structures are progressively replacing traditional materials like steel structures in the shipbuilding industry for their light weight and good mechanical characteristics. However, a lightweight composite structure has generally poor acoustic properties and is not suitable to shield noise. In this case some comfort issues may arise on board. Ships are also a source of underwater noise, which can seriously pollute the aquatic environment if a suitable form of shielding is not envisaged. It is therefore essential that some acoustic features are predicted at an early stage. The paper presents the sound reduction index evaluation based on sound pressure level and on point mobility measurements, carried out on two different types of bulkhead: a homogeneous ribbed fibreglass partition and a sandwich structure with two symmetrical fibreglass leaves plus a balsa core. From such measurements it has also been possible to determine the radiation efficiency of the structures, whose optimisation is particularly important when a reduction of the noise pollution in the aquatic environment is required.

avatar for Tom Dakin

Tom Dakin

Sr. Staff Scientist, acoustics program, Ocean Networks Canada

Ildar Urazghildiiev

Senior Research Engineer, JASCO Applied Sciences (USA) Inc.


Tuesday July 9, 2019 10:50 - 11:10 EDT
Westmount 5
  T12 Underwater & marit. noise, SS02 Ship & harbr noise & vibr