Underwater noise measurements with a ship retrofitted with PressurePoresTM noise mitigation technology and using HyDroneTM system

Atlar, Mehmet and Fitzsimmons, Patrick and Zoet, Pepijn and Troll, Moritz and Stark, Callum and Sezen, Savas and Shi, Weichao and Aktas, Batuhan and Sasaki, Noriyuki and Turkmen, Serkan and Taylor, David (2021) Underwater noise measurements with a ship retrofitted with PressurePoresTM noise mitigation technology and using HyDroneTM system. In: 11th International Symposium on Cavitation, 2021-05-10 - 2021-05-13, Online.

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    Abstract

    This paper presents the sea trials results by measuring the underwater radiated noise (URN) levels of a research vessel retrofitted with the novel "PressurePoresTM" URN mitigation technology on her propellers to demonstrate the effectiveness of this technology in full-scale. Tip Vortex Cavitation (TVC) is one of the main contributors to a URN. So the strategic implementation of the PressurePoresTM is aimed to reduce the TVC and subsequent URN of ship propellers. During the sea-trials, the URN levels were measured when the vessel's propellers were in the unmodified (without PressurePores) and modified (with PressurePores) conditions, including comprehensive cavitation observations using a high-speed camera to assess PressurePoresTM technology. The trial results showed this innovative technology could mitigate the TVC and resulting URN signature by 10dB. Also, in this measurement campaign, a novel URN measurement method using an aerial drone with a miniature hydrophone called the "HyDroneTM" system was tried successfully. HyDroneTM can be a flexible and practical alternative URN measurement technique to the conventional tethered-based method to improve the undesirable background noise corrections.

    ORCID iDs

    Atlar, Mehmet, Fitzsimmons, Patrick, Zoet, Pepijn, Troll, Moritz ORCID logoORCID: https://orcid.org/0000-0001-6858-9323, Stark, Callum ORCID logoORCID: https://orcid.org/0000-0001-7391-5197, Sezen, Savas, Shi, Weichao ORCID logoORCID: https://orcid.org/0000-0001-9730-7313, Aktas, Batuhan ORCID logoORCID: https://orcid.org/0000-0001-7194-2976, Sasaki, Noriyuki, Turkmen, Serkan and Taylor, David;