Measurements of underwater radiated noise from non-cavitating propellers in atmospheric towing tank

Islam, Md Saiful (2022) Measurements of underwater radiated noise from non-cavitating propellers in atmospheric towing tank. Masters thesis, Memorial University of Newfoundland.

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Abstract

Propeller-induced underwater radiated noise (URN) has been an increasing threat to marine ecosystems. The design of silent ships requires a set of regulations and standards that allow naval architects to assess the URN from new ships in the early design stages. Tests in towing tanks are established experimental procedures to assess the hydrodynamic performances of new ships. Recently researchers have started to focus on developing model testing to assess URN from propellers, which are major sources of the URN. In this work, the acoustic parameters of a towing tank have been analyzed both experimentally and numerically. The outcomes allow us to measure URN in the towing tank without the influence of reverberation and free surface interference. Additionally, I present a procedure to assess URN from non-cavitating propellers in atmospheric towing tanks at different hydrodynamic conditions. A MATLAB program is developed to analyze the results both in narrow and 1/3 octave bands.

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