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

Mehmet Atlar, Patrick Fitzsimmons, Pepijn Zoet, Moritz Troll, Callum Stark, Savas Sezen, Weichao Shi, Batuhan Aktas, Noriyuki Sasaki, Serkan Turkmen, David Taylor

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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.
Original languageEnglish
Number of pages7
Publication statusPublished - 13 May 2021
Event11th International Symposium on Cavitation - Online, Daejon, Korea, Republic of
Duration: 10 May 202113 May 2021


Conference11th International Symposium on Cavitation
Abbreviated titleCAV2021
Country/TerritoryKorea, Republic of
Internet address


  • PressurePoresTM noise mitigation technology
  • full-scale Underwater Radiated Noise (URN)
  • cavitation noise mitigation
  • HyDroneTM URN measurement system


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