쌍축선의 비대칭 타 토오크를 고려한 최대 허용 보상각 추정에 관한 타당성 검토 연구
A Feasibility Study on the Maximum Allowable Compensation Angle Considering Asymmetric Rudder Torque of Twin-Screw Ships
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In most twin-screw ships, rudders are typically synchronized for ease of rudder design and steering gear capacity decision. However, asymmetric rudder torque was observed during 35° turning tests of a 174K LNGC. Consequently, it was necessary for us to carry out feasibility study to improve turning performance, particularly in relation to the development of an intelligent navigation system. This paper aims to evaluate the maximum allowable compensation angle by considering asymmetric rudder torque. First, a mathematical model for predicting the maneuvering behavior of the 174K LNGC was developed and verified. Second, the empirical formula for rudder torque calculation, as suggested by the IACS, was modified to account for asymmetric inflow speed at the rudders. Third, maximum allowable compensation angles were determined according to rudder deflection angles. Finally, the potential effectiveness of the proposed approach was assessed through zigzag simulations considering the suggested concept.
Abstract
In most twin-screw ships, rudders are typically synchronized for ease of rudder design and steering gear capacity decision. However, asymmetric rudder torque was observed during 35° turning tests of a 174K LNGC. Consequently, it was necessary for us to carry out feasibility study to improve turning performance, particularly in relation to the development of an intelligent navigation system. This paper aims to evaluate the maximum allowable compensation angle by considering asymmetric rudder torque. First, a mathematical model for predicting the maneuvering behavior of the 174K LNGC was developed and verified. Second, the empirical formula for rudder torque calculation, as suggested by the IACS, was modified to account for asymmetric inflow speed at the rudders. Third, maximum allowable compensation angles were determined according to rudder deflection angles. Finally, the potential effectiveness of the proposed approach was assessed through zigzag simulations considering the suggested concept.