• Journal of the Society of Naval Architects of Korea
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• v.58 no.6
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• pp.391-399
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• 2021

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.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2017.11a
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• pp.1323-1342
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• 2017

4차 산업혁명 시대에는 산업간 경계를 뛰어넘는 혁신적 융합기술 기반 신산업 창출 및 성장동력 확보의 필요성이 제기되고 있으며, 이를 위해 관련 규제 개혁을 통한 창의적 기업활동 생태계 조성이 선행되어야 한다. 그동안 규제 개선을 위해 다양한 시책들이 추진되었으나 기술 발전의 속도를 따라잡지 못하고 있으며, 상대적으로 타 국가에 비해 과도한 규제로 인해 4차 산업혁명 대응에 있어 보다 혁신적인 변화가 요구된다. 이에 네거티브 규제 방식, 규제 샌드박스 등에 대한 검토를 통해 4차 산업혁명 시대에 적합한 규제 패러다임의 변화에 대해 분석하고자 한다.