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http://dx.doi.org/10.3744/SNAK.2021.58.6.391

Experimental Study of the Flat & Twisted Rudder Characteristics Using Rudder Dynamometer in LCT  

Ahn, Jong-Woo (Korea Research Institute of Ships & Ocean Engineering)
Paik, Bu-Geun (Korea Research Institute of Ships & Ocean Engineering)
Park, Young-Ha (Korea Research Institute of Ships & Ocean Engineering)
Seol, Han-Shin (Korea Research Institute of Ships & Ocean Engineering)
Publication Information
Journal of the Society of Naval Architects of Korea / v.58, no.6, 2021 , pp. 391-399 More about this Journal
Abstract
In order to investigate force and cavitation characteristics for the flat & twisted rudders in the Large Cavitation Tunnel (LCT), the rudder dynamometer was designed and manufactured. The measuring capacities of lift, drag and moment are ±1000 N, ±2000 N, and ±150 N-m, respectively. The present dynamometer uses the actuator with a harmonic drive to control the rudder angle without backlash. As the target ship is a military ship with twin shaft, each dynamometer was installed above the port & starboard rudders. After the installation of the model ship with all appendages, the model test composed of rudder force measurement and cavitation observation was conducted for the existing flat rudder & the designed twisted rudder. While the flat rudder showed the big difference of lift & moment between port & starboard, the twisted rudder presented a similar trend. The cavitation of the twisted rudder showed better characteristics than that of the flat rudder. Another set of model tests were conducted to investigate rudder performance by the change of the design propeller. There was little difference in rudder performance for the design propellers with slight geometric change. Through the model test, the characteristics of the flat & twisted rudders were grasped. On the basis of the present study, it is thought that the rudder with better performance would be developed.
Keywords
Rudder dynamometer; Rudder force; Rudder cavitation; Twisted rudder; Large Cavitation Tunnel(LCT);
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Times Cited By KSCI : 1  (Citation Analysis)
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