Model-scale underwater radiated noise measurements: A study of repeatability, sensitivity to loading condition variations and correlation to full scale data

In the European project AQUO, underwater radiated noise from the chemical tanker M/T Olympus was thoroughly investigated by measurements in full-scale as well as in model-scale. To investigate the repeatability of measurement and the sensitivity to loading condition variations, a new set of model-scale measurement was performed in 2019. The 2019 measurements have slightly lower cavitation volume than the 2013 measurements, but the difference is within normal variability considering water quality, propeller painting, pitch setting accuracy and set-up of the model. At the design speed, tip vortex cavitation dominates the noise with a hump around 70 Hz in full-scale. The tip vortex is under-predicted by the model-scale tests and the agreement with sea-trial data between 30 Hz and 100 Hz is not satisfactory. At the reduced velocity conditions, leading-edge vortex cavitation dominates the noise with a hump around 150 Hz in full-scale. This type of cavitation and noise seems to be better predicted by the model-scale tests, thus the agreement with the sea-trial data is good. The improved hydrophone positions gave better signal to noise ratio while the application of transfer function measurements gave better estimates in the frequency range around 100 Hz.

• Record URL:
  https://doi.org/10.1016/j.oceaneng.2020.107860
• Record URL:
  http://www.sciencedirect.com/science/article/pii/S0029801820308283
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00298018
• Supplemental Notes:
  • © 2020 Elsevier Ltd. All rights reserved. Abstract reprinted with permission of Elsevier.
• Authors:
  • Hallander, Jan
• Publication Date: 2020-11-15

Language

• English

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• Serial:
  • Ocean Engineering
  • Volume: 216
  • Issue Number: 0
  • Publisher: Pergamon
  • ISSN: 0029-8018
  • EISSN: 1873-5258
  • Serial URL: http://www.sciencedirect.com/science/journal/00298018

Subject/Index Terms

• TRT Terms: Acoustics; Cavitation (Mechanics); Noise; Propulsion; Scale models; Ships; Underwater sound
• Subject Areas: Environment; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 01753208
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 29 2020 9:58AM