Seung-Keon Lee - Academia.edu (original) (raw)
Papers by Seung-Keon Lee
Journal of Korean navigation and port research, 2005
Journal of Korean navigation and port research, 2005
Journal of Korean navigation and port research, 2005
OCEANS 2008, 2008
In the present paper, based on modular modeling concept, a mathematical model for the coupled non... more In the present paper, based on modular modeling concept, a mathematical model for the coupled nonlinear 6-DOF motions of underwater gliders is developed, and applied to investigate the characteristics of vertical and lateral motions of an autonomous underwater glider under development at National Taiwan University. In the proposed modular model, the component forces of main hull, wings, stern vertical fin
Journal of Marine Science and Technology, 2011
With a recent increase in ship capacity and propulsion performance, a wide-beam ship fitted with ... more With a recent increase in ship capacity and propulsion performance, a wide-beam ship fitted with a twin-rudder system has been adopted in many cases. However, to improve ship manoeuvring, it is still necessary to have a better understanding of rudder-hull interactions in twin-rudder ships. Captive model tests (oblique towing and circular motion test) as well as free-running tests with a single-propeller twin-rudder ship and a twin-propeller twin-rudder ship are carried out. The effect of drift angle on the rudder forces and some peculiar phenomena concerning rudder normal force for twin-rudder ships are evaluated. A method for estimating the hull-rudder interaction coefficients based on free-running experimental results is proposed.
Korean Journal of Anesthesiology, 1999
2011 IEEE Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies, 2011
ABSTRACT Ahstract- This paper describes the mathematical modeling, control algorithm, system desi... more ABSTRACT Ahstract- This paper describes the mathematical modeling, control algorithm, system design, hardware implementation and experimental test of a Manta-type Unmanned Underwater Vehicle (MUUV). The vehicle has one thruster for longitudinal propulsion, one rudder for heading angle control and two elevators for depth control. It is equipped with a pressure sensor for measuring water depth and Doppler Velocity Log for measuring position and angle. The vehicle is controlled by an on-board PC, which runs with the Windows XP operating system. The dynamic model of 6DOF is derived including hydrodynamic forces and moments acting on the vehicle, while the hydrodynamic coefficients related to the forces and moments are obtained from experiments or estimated numerically. We also utilized the values obtained from PMM (Planar Motion Mechanism) tests found in the previous publications for numerical simulations. Various controllers such as PID, Sliding mode, Fuzzy and Hen controllers are designed for depth and heading angle control in order to compare the performance of each controller based on simulation. In addition, experimental tests are carried out in towing tank for depth keeping and heading angle tracking.
29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 2, 2010
Journal of Ocean Engineering and Technology, 2014
Journal of Fluid Machinery, 2015
2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies, 2007
This paper describes the design and development of a hovering AUV constructed at Cheju National U... more This paper describes the design and development of a hovering AUV constructed at Cheju National University and analyses the dynamic performance of the vehicle using simulation program. The main purpose of this AUV is to carry out fundamental tests on its station keeping, attitude control, and desired position tracking. Its configuration is similar to the general ROV appearance for underwater works and its dimensions are 0.75 m times 0.5 m times 0.5 m. It has 4 thrusters of 450 watts for longitudinal/lateral/vertical propulsion and is equipped with a pressure sensor for measuring water depth and a magnetic compass for measuring heading angle. The navigation of the vehicle is controlled by an on-board Pentium III-class computer, which runs with the help of the Windows XP operating system. These give us an ideal environment for developing various algorithms needed for developing and advancing hovering AUV.
Journal of Korean navigation and port research, 2008
Journal of Korean navigation and port research, 2008
Journal of the Society of Naval Architects of Korea
ABSTRACT
Journal of Ocean Engineering and Technology, 2014
Journal of the Society of Naval Architects of Japan, 1988
Journal of Ocean Engineering and Technology, 2014
Journal of Ocean Engineering and Technology, 2011
Journal of the Society of Naval Architects of Korea, 2012
ABSTRACT
Journal of Korean navigation and port research, 2005
Journal of Korean navigation and port research, 2005
Journal of Korean navigation and port research, 2005
OCEANS 2008, 2008
In the present paper, based on modular modeling concept, a mathematical model for the coupled non... more In the present paper, based on modular modeling concept, a mathematical model for the coupled nonlinear 6-DOF motions of underwater gliders is developed, and applied to investigate the characteristics of vertical and lateral motions of an autonomous underwater glider under development at National Taiwan University. In the proposed modular model, the component forces of main hull, wings, stern vertical fin
Journal of Marine Science and Technology, 2011
With a recent increase in ship capacity and propulsion performance, a wide-beam ship fitted with ... more With a recent increase in ship capacity and propulsion performance, a wide-beam ship fitted with a twin-rudder system has been adopted in many cases. However, to improve ship manoeuvring, it is still necessary to have a better understanding of rudder-hull interactions in twin-rudder ships. Captive model tests (oblique towing and circular motion test) as well as free-running tests with a single-propeller twin-rudder ship and a twin-propeller twin-rudder ship are carried out. The effect of drift angle on the rudder forces and some peculiar phenomena concerning rudder normal force for twin-rudder ships are evaluated. A method for estimating the hull-rudder interaction coefficients based on free-running experimental results is proposed.
Korean Journal of Anesthesiology, 1999
2011 IEEE Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies, 2011
ABSTRACT Ahstract- This paper describes the mathematical modeling, control algorithm, system desi... more ABSTRACT Ahstract- This paper describes the mathematical modeling, control algorithm, system design, hardware implementation and experimental test of a Manta-type Unmanned Underwater Vehicle (MUUV). The vehicle has one thruster for longitudinal propulsion, one rudder for heading angle control and two elevators for depth control. It is equipped with a pressure sensor for measuring water depth and Doppler Velocity Log for measuring position and angle. The vehicle is controlled by an on-board PC, which runs with the Windows XP operating system. The dynamic model of 6DOF is derived including hydrodynamic forces and moments acting on the vehicle, while the hydrodynamic coefficients related to the forces and moments are obtained from experiments or estimated numerically. We also utilized the values obtained from PMM (Planar Motion Mechanism) tests found in the previous publications for numerical simulations. Various controllers such as PID, Sliding mode, Fuzzy and Hen controllers are designed for depth and heading angle control in order to compare the performance of each controller based on simulation. In addition, experimental tests are carried out in towing tank for depth keeping and heading angle tracking.
29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 2, 2010
Journal of Ocean Engineering and Technology, 2014
Journal of Fluid Machinery, 2015
2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies, 2007
This paper describes the design and development of a hovering AUV constructed at Cheju National U... more This paper describes the design and development of a hovering AUV constructed at Cheju National University and analyses the dynamic performance of the vehicle using simulation program. The main purpose of this AUV is to carry out fundamental tests on its station keeping, attitude control, and desired position tracking. Its configuration is similar to the general ROV appearance for underwater works and its dimensions are 0.75 m times 0.5 m times 0.5 m. It has 4 thrusters of 450 watts for longitudinal/lateral/vertical propulsion and is equipped with a pressure sensor for measuring water depth and a magnetic compass for measuring heading angle. The navigation of the vehicle is controlled by an on-board Pentium III-class computer, which runs with the help of the Windows XP operating system. These give us an ideal environment for developing various algorithms needed for developing and advancing hovering AUV.
Journal of Korean navigation and port research, 2008
Journal of Korean navigation and port research, 2008
Journal of the Society of Naval Architects of Korea
ABSTRACT
Journal of Ocean Engineering and Technology, 2014
Journal of the Society of Naval Architects of Japan, 1988
Journal of Ocean Engineering and Technology, 2014
Journal of Ocean Engineering and Technology, 2011
Journal of the Society of Naval Architects of Korea, 2012
ABSTRACT