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http://dx.doi.org/10.7776/ASK.2011.30.2.063

Measurement System for Performance Evaluation of Acoustic Materials in a Small Water Tank  

Shin, Mi-Ru (한국해양대학교 해양공학과)
Cho, Jung-Hong (한국해양대학교 해양공학과)
Lee, Kyung-Teak (한국해양대학교 해양공학과)
Kim, Jea-Soo (한국해양대학교 해양공학과)
Jeon, Jae-Jin (국방과학연구소)
Ham, Il-Bea (국방과학연구소)
Kang, Chang-Gi ((주)화승알앤에이)
Publication Information
The Journal of the Acoustical Society of Korea / v.30, no.2, 2011 , pp. 63-72 More about this Journal
Abstract
Since the detection probability is critically dependent on the target strength (TS) in active sonar and on the radiated noise level (RNL) in passive sonar, the acoustic materials for echo reduction (ER) and transmission loss (TL) are widely used for the stealth of underwater targets. In this paper, a measurement system based on the small water tank, for the frequency range of greater than 30 kHz, is developed and verified using reference targets. In order to design the water tank and the geometry of test samples, a program is developed to calculate the arrival time of interfering signals due to the reflection from water tank walls and also due to the diffraction from the edge of the test samples. Considering all the interfering signals, an optimal experimental configuration for water tank and test samples is designed and used throughout the experiment. Next, the signal processing algorithms to estimate ER and TL are developed based on the measured propagation loss reflecting the geometric spreading characteristics of the transducer. Finally, a set of reference targets such as aluminium plate and perfectly reflecting plate are used in a small water tank to verify the developed measurement system.
Keywords
Echo Reduction; Transmission Loss;
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Times Cited By KSCI : 1  (Citation Analysis)
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