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http://dx.doi.org/10.7776/ASK.2011.30.1.009

Underwater Noise Measurements on the Immersed Hydrofoil of High-Speed Vessel  

Park, Ji-Yong (한국해양연구원/해양시스템안전연구소)
Lee, Keun-Hwa (서울대학교 공과대학 조선해양공학과)
Seong, Woo-Jae (서울대학교 공과대학 조선해양공학과)
Publication Information
The Journal of the Acoustical Society of Korea / v.30, no.1, 2011 , pp. 9-16 More about this Journal
Abstract
When a hydrofoil ship plies at high speed, there exist possibilities of collision with ocean mammals dwelling near the surface. An active sonar located within the immersed hydrofoil structure that provides the lift for the vessel, can be used for early warning of their presence. The proper functioning of the active sonar system depends on its ability to reject noise and pick up the target signal. In this article, we measured the noise on a hydrofoil of an operating ship with two flush-mounted hydrophones. The measurements were conducted for the purpose of (1) identifying the effect of operating state of machinery likes engine, cooler and generator (2) observing the change of noise depending on the measuring position (3) observing the change of noise with increasing ship speed. To verify our experiment, experiments were performed three times and the measured results are compared with other investigations and they show similarity to each other. The results are analyzed with frequency domain in order to apply to operating active sonar detecting system and focus on high frequency band within sonar's operating frequency region. Through these experiments and analysis, it is expected that we can identify the generated noise around hydrofoil where active sonar is installed and these results lead us to design active sonar that could distinguish target signal from noise more effectively.
Keywords
Hydrofoil ship; Fast ship noise; Active sonar; Flow noise;
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