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http://dx.doi.org/10.3744/SNAK.2021.58.3.167

An Experimental Study on the Frequency Characteristics of Cloud Cavitation on Naval Ship Rudder  

Paik, Bu-Geun (Korea Research Institute of Ships & Ocean Engineering)
Ahn, Jong-Woo (Korea Research Institute of Ships & Ocean Engineering)
Jeong, Hongseok (Korea Research Institute of Ships & Ocean Engineering)
Seol, Hanshin (Korea Research Institute of Ships & Ocean Engineering)
Song, Jae-Yeol (Department of Mechatronics Engineering)
Ko, Yoon-Ho (Department of Mechatronics Engineering)
Publication Information
Journal of the Society of Naval Architects of Korea / v.58, no.3, 2021 , pp. 167-174 More about this Journal
Abstract
In this study, the amount and frequency characteristics of cloud cavitation formed on a navy ship rudder were investigated through cavitation image processing technique and cavitation noise analysis. A high-speed camera with high time resolution was used to observe the cavitation on a full-spade rudder. The deflection angle range of the full-spade rudder was set to 8 to 15 degrees so that cloud cavitation was generated on the rudder surface. For images taken at 104 fps (frame per second), reference values for detecting cavitation were defined and detected in Red, Green, Blue and Hue, Saturation, Lightness color spaces to quantitatively analyze the amount of cavitation. Intrinsic frequency characteristics of cloud cavitation were detected from the time series data of the amount of cavitation. The frequency characteristics of cloud cavitation obtained by using the image processing technique were found to be the same through the analysis of the noise signal measured by the hydrophone installed on the hull above the rudder, and its peak value was in the frequency band of 30~60Hz.
Keywords
Rudder cavitation; Image analysis; High-speed camera; cavitation noise; Frequency characteristics; Navy ship;
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Times Cited By KSCI : 8  (Citation Analysis)
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