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http://dx.doi.org/10.5050/KSNVE.2014.24.12.969

Error Investigation in use of Near-field Acoustic Holography in the Underwater Environment of Reflected Wave  

Yi, Jongju (Agency for Defense Development)
Kang, Myunghwan (Agency for Defense Development)
Han, Seungjin (Agency for Defense Development)
Jeong, Hyunjoo (Agency for Defense Development)
Bae, Sooryong (Agency for Defense Development)
Jung, Woojin (Agency for Defense Development)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.24, no.12, 2014 , pp. 969-976 More about this Journal
Abstract
Nowadays, it is required for naval ships to estimate 3D underwater radiated noise pattern in all direction at peak frequencies of hull vibration for the reduction of being detected and doing the effective operation. For this purpose, the numerical method has to be developed to calculate 3D underwater radiated noise pattern with experimental data. It is very difficult to obtain the experimental data for the real ship. Alternative to get the experimental results is to use NAH(near-field acoustic holography) in acoustic tank with experimental model. Application of NAH in acoustic tank for the experimental model needs some investigation of reflection wave from the wall of the acoustic tank and unmeasured zone of the experimental model due to the supporting structure for it. In this study, the effect of reflection wave in the acoustic tank and unmeasured area of the experimental model when using the NAH was investigated with experiment and numerical model. From these, it is known for the error due to reflection wave can be reduced when the distance between the measurement plane and source is being shorten. Also, unmeasured area of the experimental model gives rise to some error in the estimation of the far-field acoustic pressure.
Keywords
Underwater Radiation Noise Pattern; Far-field Radiated Noise Estimation; Near-field Acoustic Holography;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
연도 인용수 순위
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