• Transactions of the Korean Society of Mechanical Engineers A
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• v.40 no.11
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• pp.963-970
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• 2016

This research deals with design and performance validation of eco-pedals that generate tactile pedal force to guide fuel saving driving behavior. For eco-pedal control logic, allowable fuel consumption at given driving speed is calculated based on pre-defined "allowable acceleration", and if the actual fuel consumption exceeds the allowable fuel consumption, then pedal force is activated. Pedal force should be recognizable to driver while not causing unpleasantness, and should not interfere with normal operation of pedal. Reaction forces that increase pedal stiffness abruptly, such as step and ramp shape, turn out to be not suitable due to pedal overshoot after release of reaction force. With this regards, vibration type reaction force is adopted, and its optimal frequency, magnitude and duration is determined through subjective evaluation with consideration to effect to fuel efficiency. Though highway and city driving test, it is demonstrated that fuel efficiency increase of 13% for highway and 15% for city is achieved.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.25 no.2
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• pp.70-74
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• 1989

This paper, described on the maneuverabilities of M.S. Cheju 402, the stern trawler (159 G.T.), training ship of Cheju National University which carried out the turning circle tests at helm angle 35$^{\circ}$ and 10$^{\circ}$, 20$^{\circ}$, 30$^{\circ}$Ztests of her. The results obtained were as follows; 1. The advances of the starboard and port turning circles were 79.1m, about 2.6 times of the length of the ship, and 81.4m, about 2.7 times of it, respectively. 2. The rates of speed reduction were about 0.49 together, and mean values of turning angular velocity of her at helm angle 35$^{\circ}$ into the starboard and port sides were 4.3$^{\circ}$/sec and 4$^{\circ}$/sec during the turning movement. 3. Overshoot angles of starboard side werelarger than those of port side at all Z tests, and mean values of them of the starboard and port sides at 10$^{\circ}$, 20$^{\circ}$, 30$^{\circ}$Z tests were 110.5$^{\circ}$ 20.5$^{\circ}$, 28.5$^{\circ}$ respectively. 4. The maneuvering indices K and T of experimental ship at 10$^{\circ}$, 20$^{\circ}$, 30$^{\circ}$, Z tests were 0.755 and 3.468, 0.566, and 1.621, and 0.481 and 1.547 respectively. Consequently, the experimental ship showed that her turning ability was more in effective as the helm angle was becomed larger and her obeying ability was more effective as it was becomed larger.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.506-510
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• 2004

A torque transmission system composed of several gears and couplings is flexible. In order to get an exact response of motor, the torsional vibration due to an unexpected change of motor speed must be suppressed. Therefore, it is very important that motor control suppress vibration. Various methods to control it including dual inertia system are proposed. Specially, the method of vibration suppression is that vibration can be suppressed to fee㏈ack the estimated torsion torque via the disturbance observer filter being of normal filter. The suitable Proportional controller and coefficient parameter can be designed using CDM and the torsional vibration also be suppressed, but it has a low degree of adaptability to disturbance. The PID controller can be designed easily, but makes the excessive overshoot and oscillation for system response in the early period. To resolve these problems, simple and practical PID controller with two degree of freedom is proposed recently that it ran improve performance of obeying the reference unconcerned in any disturbance by changing the proportional gain by two degree of freedom parameter. But it has also the defect that parameter a must be changed to obtain the ideal Proportional parameter. On this paper, we design the controller which automatically adjusts parameter u using fuzzy Algorithm to overcome such defects. Also, we compare the proposed method with established one and evaluate them to confirm performance of the designed controller.