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황종관,윤명균,강대민 釜慶大學校 2002 釜慶大學校 論文集 Vol.7 No.-
This paper describes the energy absorption of a square tube in the cases of two models under axial compression by using PAM-CRASHTM. The first model is the model with various thickness under contant length, and the second model is the model with various length under constant thickness. To verify the energy absorption and the effects of dimensions, the standards were used as related density and specific energy and mean crushing load. The results were discussed by the relationship between crush load vs. deformation, related density vs. specific energy, crush load vs. mean crush load, and the relationship between mean crush load vs. specific energy.
적응제어 이론을 기초로한 영구자석 동기 전동기의 강인성 제어시스템
윤병도,윤명균,김윤호,공상호 중앙대학교 기술과학연구소 1991 기술과학연구소 논문집 Vol.21 No.-
The Permanent Magnet Synchronous Motor (PMSM) is favored in industrial servo application in recent years because of its high efficiency and torque to inertia. Vector-control scheme simplifies the analysis of ac motor characteristics and design of control system. By vector-control method, the control structure of PMSM can be linearized, thus PMSM has the same operating characteristics as separately excited dc motor. The drive system of servo motor is requested to have robustness of disturbance and parameter variation. However, the dynamics of PMSM drive is changed significantly by forced disturbance and parameter variation. Moreover, the state error caused by them should be suppressed completely and rapidly. In this paper, the vactor-control system of PMSM using dual adaptive control loop is investigated. In the proposed system, linear adaptive control loop rapidly recovers the state error caused by both disturbance and parameter variation. In the dual adaptive control loop, the inner loop reduces the system sensitivity of parameter variation and disturbance, and the outer loop suppresses the state error caused by them completely. The proposed servo system is verified through a computer simulations and experimental results.
김상혁,윤용현,민병희,임병근,윤명균,임병시 한국천문학회 2019 天文學論叢 Vol.34 No.3
We study the internal structure under the artificial mountain of Heumkyeonggak-nu, a Korean water-powered clock in the early Joseon dynasty. All the puppets on the artificial mountain are driven by the rotational force generated by the water wheel at their designated time. We design a model that work with three parts of the artificial mountain. At the upper part of the artificial mountain to the east, west, north and south, there are four puppets called the Four Mystical Animal Divinity and four ladies called the Jade Lady respectively. The former rotate a quarter every double hour and the latter rings the bell every hour. In the middle part of this mountain is the timekeeping platform with four puppets; the Timekeeping Official (Hour Jack), the Bell-, Drum-, and Gong-Warriors. The Hour Jack controls time with three warriors each hitting his own bell, drum, and gong, respectively. In the plain there are 12 Jade Lady puppets (the lower ladies) combined with 12 Oriental Animal Deity puppets. In his own time a lady doll pops out of the hole and her animal doll gets up. Two hours later, the animal deity lies down and his lady hides in the artificial plain. These puppets are regularly moved by the signal such as iron balls, bumps, levers, and so on. We can use balls and bumps to explain the concept of the Jujeon system. Iron balls were used to manipulate puppets of the timekeeping mechanism in Borugak-nu, another Korean water-powered clock in Joseon dynasty, which was developed earlier than Heumgyeonggak-nu. According to the North Korea’s previous study (Choi, 1974), it is obvious that bumps were used in the internal structure of Heumgyeonggak-nu. In 1669, The armillary clock made by Song, I-young was also utilized bumps. Finally we presented mock-ups of three timekeeping systems.
A Study on an Analysis and Design of the Internal Structure of Heumgyeonggak-nu
김상혁,윤용현,함선영,민병희,기호철,윤명균 한국우주과학회 2017 Journal of Astronomy and Space Sciences Vol.34 No.2
In this study, the internal structure of a Heumgyeonggak-nu (欽敬閣漏) was designed, and the power transmission mechanism was analyzed. Heumgyeonggak-nu is an automated water clock from the Joseon Dynasty that was installed within Heumgyeonggak (欽敬閣), and it was manufactured in the 20th year of the reign of King Sejong (1438). As descriptions of Heumgyeonggak-nu in ancient literature have mostly focused on its external shape, the study of its internal mechanism has been difficult. A detailed analysis of the literature record on Heumgyeonggak-nu (e.g., The Annals of the Joseon Dynasty) indicates that Heumgyeonggaknu had a three-stage water clock, included a waterfall or tilting vessel (欹器) using the overflowed water, and displayed the time using a ball. In this study, the Cheonhyeong apparatus, water wheel, scoop, and various mechanism wheels were designed so that 16 fixed-type scoops could operate at a constant speed for the water wheel with a diameter of 100 cm. As the scoop can contain 1.25 l of water and the water wheel rotates 61 times a day, a total of 1,220 l of water is required. Also, the power gear wheel was designed as a 366-tooth gear, which supported the operation of the time signal gear wheel. To implement the movement of stars on the celestial sphere, the rotation ratio of the celestial gear wheel to the diurnal motion gear ring was set to 366:365. In addition, to operate the sun movement apparatus on the ecliptic, a gear device was installed on the South Pole axis. It is expected that the results of this study can be used for the manufacture and restoration of the operation model of Heumgyeonggak-nu.