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 Our research is dedicated to the physical understanding of acoustical phenomena in the ocean and its applications. The area of research includes analytic and numerical modeling, exploratory data processing and analysis, and advanced development of solutions, based on understanding of sound propagation in the ocean media including its boundaries.

 

 We develop sonar systems using SAS, SLAM and other advanced signal processing techniques. Range dependent propagation models are developed using the parabolic equation (SNUPE) and ray theory (SNURAY), respectively. The locations of propeller noise source can be found based on matched filter processing (MFP) and they are used to estimate pressure fluctuations on adjacent ship surface. We have developed scaling law based on physical phenomenon of tip vortex cavitation (TVC) to estimate porotype power spectral density (PSD).

 

 These engineering techniques are used to cover major issues in the ocean environment, underwater communication, seafloor characteristics, underwater vehicles, etc. Recently, we have focused on underwater noise reduction related to ocean development activity, which has become an important subject in environmental technology.

 

▶ Sound Propagation Modeling

 

· Rang dependent propagation modeling using the parabolic equation (SNUPE)

· Pseudo-spectral time-domain(PSTD) propagation modeling

· Wave propagation modeling in the irregular moving surface

 

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▶ Reverberation and Scattering Modeling

 

· Time-domain reverberation with ray theory

· Ocean surface scattering with PSTD method

· Target scattering modeling

 

 ▶ Ocean Sediment Acoustics

 

· Sound propagation in the porous medium

· Shallow water acoustics with the ocean sediment

 

▶ Sonar Applications for AUV


· Obstacle avoidance system using active sonar (SNUUV1)

· Concurrent mapping and localization

 

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▶ Ship Propeller Noise Estimation


· Extrapolation of model test result to prototype power spectrum

· Estimation of broadband prototype power spectrum for TVC using the developed scaling law

 

 

 

▶ Underwater Piling Noise


· Underwater piling noise propagation modeling

· Development of noise attenuation method

              

 Underwater Piling Noise1.jpg      Underwater Piling Noise2.jpg

 

 

▶ Ship's propeller noise estimation


· Noise source inversion for the estimation of propeller induced pressure
· Fluctuation behavior of cavitation/noncavitation induced pressure

 

     s propeller noise estimation1.jpgs propeller noise estimation2.jpg

 

Contact us :

 

Professor : Dept. of Naval Architecture and Ocean Engineering, Collage of Engineering, Seoul National University, 1, Gwanak-ro, Gwanak-gu, Seoul, 151 - 744, Korea
Department Location : Building 34,

02) 880 - 8359

 

Laboratory : Dept. of Naval Architecture and Ocean Engineering, Collage of Engineering, Seoul National University, 1, Gwanak-ro, Gwanak-gu, Seoul, 151 - 744, Korea
Department Location : Building 34, Room 306

02) 880 - 7332