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- 저자 : 이호훈(Ho-Hoon Lee) (검색결과 5 건)
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이호훈,조성근,Lee, Ho-Hoon,Cho, Sung-Kun 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.10
In this paper, a new nonlinear dynamic model is derived for a 2-dimensional overhead crane based on a new definition of 2-degree-of-freedom swing angle, and a new anti-swing control law is proposed for the crane. The dynamic model and control law take simultaneous travel and traverse motions of the crane into consideration. The model is first linearized for small motions of the crane load about the vertical stable equilibrium. Then the model becomes decoupled and symmetric with respect to the travel and traverse axes of the crane. From this result, a decoupled anti-swing control law is proposed based on the linearized model via the loop shaping and root locus methods. This decoupled method guarantees not only fast damping of load-swing but also zero steady state position error with optimal transient response for the 2-dimensional motion of the crane. Finally, the proposed control method is evaluated by controlling the simultaneous travel and traverse motions of a 2-dimensional prototype overhead crane. The effectiveness of the proposed control method is then proven by the experimental results.
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이호훈,Lee, Ho-Hoon 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.6
This paper describes a new 14-CPU real-time distributed automatic gauge control (AGC) system for POSCO's No. 2 Hot Strip Mill at Pohang Works. The new AGC system has adopted gaugemeter AGC, Monitor AGC, and roll gap disturbance compensators. The computer system for the new AGC system has been developed based on VMEbus computer systems and a commercial real-time operating system. A VMEbus computer system is also used for the position servo control of hydraulic cylinders. All the application programs and input/output signals have been reasonably distributed over the control computer systems for the maximum reliability and effectiveness of the system. The new AGC system has been successfully used for the No. 2 Hot Strip Mill.
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이호훈,조성근,Lee, Ho-Hoon,Cho, Sung-Kun 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.2
This paper presents a systematic design method of an anti-swing control law for overhead cranes. A velocity servo system for the trolley of a crane is designed based on the dynamics of the trolley and its load. The velocity servo system compensates for the effects of load swing on the trolley dynamics so that the velocity servo is independent of load swing. The velocity servo system is used for the design of a position servo system for the trolley via the loop shaping method. The position servo system and the swing dynamics of the load are then used to design an angle control system for load swing based on the root locus method. The combined position servo and the angle control systems constitute the overall control system. In the presence of low frequency disturbances, the proposed control law guarantees accurate position control for the trolley and fast damping for load swing. Furthermore, the performance of the proposed control law is independent of the mass of the load. Experimental results on a prototype crane show the effectiveness of the proposed anti-swing control law.
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이호훈,김홍열,고희종,류수노,Lee, Ho-Hoon,Kim, Hong-Yeol,Koh, Hee-Jong,Ryu, Su-Noh 한국작물학회 2006 Korean journal of crop science Vol.51 No.suppl1
유색미의 이화학적 특성을 구명하고자 현미 색깔이 서로 다른 품종을 재배하여 색도, 일반성분, 지방산, 무기질, 비타민, 식이섬유 등 주요 화학성분을 비교 분석하였다. 그 결과 현미의 색도 L값은 흰색 > 녹색 > 적갈색 > 흑자색의 순으로 낮았고, a값은 적갈색 > 흑자색 > 흰색 > 녹색의 순이었다. 단백질함량은 $7.01{\sim}10.74%$의 범위를 나타내어 현미색에 따른 차이가 컸고 그 중 흑자색인 C3GHi계통이 가장 높았다. 지방함량은 $2.6{\sim}3.3%$의 범위로 큰 차이가 없었다. 비타민 $B_1,\;B_2$ 함량과 식이섬유함량은 흰색에 비하여 녹색에서 현저하게 높은 값을 나타내었다. 지방산조성을 분석한 결과 흰색은 올레산과 레놀레산의 지방산 조성비율이 비슷하였으나 흑자색은 올레산보다는 리놀레산의 비율이 높았고, 적갈색은 반대로 리놀레산 보다 올레산의 조성비율이 더 높게 나타났다. Fe, Zn, Mn을 제외한 대부분의 무기질 함량은 유색미가 흰색 보다 높은 값을 보였고 그 중에서도 녹색이 가장 높았다. The composition of fatty acids, minerals, total dietary fiber and vitamin $B_1,\;B_2$, in pigmented rice varieties were determined. Proximate composition and color were also compared among pigmented rice varieties. Crude protein contents of black rice were higher than those of red and white rice, especially, C3GHi line had the highest protein content. There were no significant differences in lipid and crude ash contents between pigmented and white rice. Black rice showed lower Hunter value L and b value compared with red, green and white rice. But, Green rice showed lower Hunter value a compared with black rice. Green rice showed the higher contents in total dietary fiber, vitamin $B_1\;and\;B_2$ compared with white and black rice. The major fatty acids of pigmented rice were palmitic acid, oleic acid and linoleic acid. The contents of oleic acid was similar to that of linoleic acid in white rice. Oleic acid contents was lower than linoleic acid in black rice, but higher in red rice. Most mineral contents of pigmented rice except Fe, Zn and Mn were higher than those of white rice. Especially, Green rice had the highest mineral content.
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李縞勳 水原大學校 1997 論文集 Vol.15 No.-
The paper presents a new design method of an anti-swing control law for overhead cranes with hoisting of loads. The velocity servo system of the trolley of a crane is modeled based on experiments. The model of the velocity servo system is then used for the design of a trolley position servo loop and an angle feedback loop for constant rope length via the loop shaping and root locus methods. The combined trolley position servo and angle feedback loops constitute the anti-swing control law. Finally, a method of adjusting the angle control gains is proposed for variable rope length. Experimental results on a prototype crane show the effectiveness of the proposed anti-swing control method.
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