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동시최적화 설계기법을 이용한 항만용 크레인의 흔들림 제어계 설계
김영복(YOUNG-BOK KIM),문덕홍(DUK-HONG MOON),양주호(JOO-HO YANG),채규훈(GYU-HOON CHAE) 한국해양공학회 2005 韓國海洋工學會誌 Vol.19 No.3
The sway motion control problem of a container hanging on the trolley is considered in this paper. In the container crane control problem, the main issue involves suppressing the residual swing motion of the container at the end of acceleration, during deceleration, or for an unexpected disturbance input. For this problem, in general, many trolley motion control strategies are introduced and applied. In this paper, we introduce and synthesize a swing motion control system, in which a small auxiliary mass is installed on the spreader. In this control system, the actuator reacting against the auxiliary mass applies inertial control forces to the container to reduce the swing motion in the desired manner. In many studies, the controllers used to suppress the vibration have been synthesized for the given mathematical model of plants. In many cases, the designers have not been able to utilize the degree of freedom to adjust the structural parameters for the control object. To overcome this problem, so called "Structure/Control Simultaneous Method" is used. From this, in this paper the simultaneous design method is used to achieve optimal system performance. And the experimental result shows that the proposed control strategy is useful, to the case of that the controlled system is exposed to the uncertainties and, robust to disturbances like wind.
직접분사식 디젤기관에 있어 흡입공기가 그 성능에 미치는 영향
문덕홍 한국수산학회 1978 한국수산과학회지 Vol.11 No.3
直接噴射式 디젤機關에 있어 燃料噴射量 일정인 狀態에서 負荷를 增加시킬때 吸入空氣가 機關性能에 미치는 영향을 實驗한 結果는 다음과 같다. 1. 負荷가 增加할 수록 吸入期間中 P_g/P_a는 높아진다. 2. 負荷增加에 따라 吸入空氣量은 300rpm에서 약 11% 250rpm에서 약 23%의 增加를 초래한다. 3. 250rpm에서와 같은 심한 負荷增加는 발화늦음이 더욱 길어지게 되고 따라서 圖示馬力은 약 35% 감소한다. With the direct injection diesel engine, the author carried out experiment by oscilloscope indicator, to investigate the effects of suction period, P_g and ΔG on the engine performance as varing the load under same fuel injection. Results obtained were summarized as follow; 1) The increase of engine load makes P_g/P_a raise in the suction period. 2) The variation of engine load has brought out about 11% increase of suction air weight in r. p. m. 300 and 23% increase in r. p. m. 250 comparing to the normal operation revolution. 3) The more increase of the load under same fuel consumption, the longer ignition lag is, and therefore I. H. P. is decreased about 35% in r. p. m. 250.