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Tuesday, July 9 • 15:30 - 15:50
UNDERWATER NOISE PREDICTION AND DEVELOPMENT OF SPECIAL PURPOSE SHIPS

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Mitsubishi Heavy Industries, Ltd. (MHI) and Mitsubishi Shipbuilding Co., Ltd. (MHIMSB) have been continuously building many state of the art special purpose ships, such as marine resources survey ships and ocean research ships. In order to demonstrate the performance of underwater investigation systems enough and to localize influence on marine life, it is important for these ships to make silent the underwater noise radiated from the ship itself. Then, our company developed the underwater noise estimation methods of the broad band frequency range which utilized experimental data and large-scale-analysis techniques for the ship silent design. Regarding propeller noise, the prediction technique combining the knowledge based on the experimental results and the theory about propeller tip vortex and cavitation was developed. Regarding machinery noise, in consideration of the characteristic to the frequency range of the noise transmitted hull structure and underwater, the prediction techniques using SEA (statistical energy analysis) in which high frequency range and large-scale FEM (finite element method) and FMBEM (fast multipole boundary element method) in which low frequency range were applied. With these estimation methods, the propeller blade design which controlled the propeller cavitation, the optimal support design of machineries, the appropriate design of the damping-materials construction area and etc. were performed. In the underwater noise measurement after the ship construction, it was confirmed that the prediction techniques have good accuracy and the special purpose ship has silent underwater radiation noise.

Moderators
avatar for Tom Dakin

Tom Dakin

Sr. Staff Scientist, acoustics program, Ocean Networks Canada
IU

Ildar Urazghildiiev

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

Authors

Tuesday July 9, 2019 15:30 - 15:50 EDT
Westmount 5
  T12 Underwater & marit. noise, SS02 Ship & harbr noise & vibr