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남택근(T. K. Nam),노영오(Y. O. Roh),안병원(B. W. Ahn),박영산(Y. S. Park) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper presents the control of an underactuated two-link and three-link acrobat robot. We derived system equations from the nonholonomic acceleration constraints by using the law of conservation of angular momentum. Then we applied zero dynamics to stabilize the two-link and three-link acrobat robot around its uppermost equilibrium point. Simulation results are given to show the effectiveness of the proposed control strategy.
남택근(T. K. Nam),노영오(Y. O. Roh),허광석(G. S. Heo) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this paper, a state steering strategy for high order chained system is presented. High order chained system can be derived from the acceleration constraints that cannot be integrable. Such a system classified as a nonholonomic systems and cannot be controlled to its equilibrium points by continuous and time-invariant controller. Using variable transformation, two sub system can be obtained from the high order chained system. Deadbeat control and iterative state steering methods are proposed to control the systems. Simulation results are given to show the effectiveness of the proposed control strategy.
LC필터를 이용한 3상유도전동기의 전류파형 개선에 관한 연구
박진길(J.G.Park),남택근(T.K.Nam),노영오(Y.O.Roh),정주윤(J.Y.Chung) 한국해양대학교 해사산업연구소 1996 海事産業硏究所論文集 Vol.5 No.-
An AC induction motor of constant speed characteristics has been widely used as power source because of simple structure and low maintenance cost in industrial field. Recently, the variable speed 3Φ induction motor driven by the inverter is utilized as a servo-motor of automatic control device and as a power source of elevator and electric locomotive, etc. The variable frequency AC source made by a conventional inverter which is composed of power semi-conductors and drive systems includes much noises in sine wave current due to high speed switching of direct current. In this paper, the low pass LC Filter for a variable speed induction motor driven by a full bridge inverter is introduced to solve EMI problem originated by much noise current. The modified LC filter based on the 3rd order Butterworth LC filter is used for the computer simulations and real experiments. The characteristics of proposed LC filter are investigated through FFT analysis. From experimental results, it is confirmed that noiseless AC current of sine wave fer a variable speed 30 induction motor can be obtained by the designed LC filter.
AC 전동기 구동용 저역통과 LC필터를 가진 디지탈 인버터의 교류전원 파형 개선
박진길(J.G.Park),강창남(C.N.Kang),정주윤(J.Y.Chung),노영오(Y.O.Roh) 한국해양대학교 해사산업연구소 1996 海事産業硏究所論文集 Vol.5 No.-
Recently, the AC motor which has a simple structure and needs less maintenance has become to be used frequently as a servomotor for position control in the automatic control field. This paper concerns with a method to improve the current waveveforms of the variable speed30 AC motor system driven by the single-pulse PWM, and the current waveforms are analyzed by FFT under various running conditions. The system is composed of a digital bridge inverter, low pass LC filter, and 3Φ AC motor. By the performance anaysis through the computer simulations and experiments , AC source of pseudo sine waveform can be obtained from the modulated alternating square voltage by means of the well designed LC filter.
노영오,안병원,박영산,김현수 木浦海洋大學校 2000 論文集 Vol.8 No.1
This paper presents a developed squirrel cage induction motor for axial flow fan. Nearly all of the induction motors for fan consists of two parts, rotor and stator, and the position of rotor is located inside of stator. This construction restricts the air flow rate, otherwise requires bending duct. But developed squirrel cage induction motor for axial flow fan exchanged the position each other. So, we can reduce the weight and size about 30%, and there are no bending duct to locate the fan motor.
안병원,김현수,박영산,박중순,노영오,배철오 木浦海洋大學校 2001 論文集 Vol.9 No.1
There are many different cards and keys that are used. But the functions or companies are different, so there are many inconvenience to carry and use. Nowadays, It is need to unite of many card functions in one card. Many companies are using card key for access offices instead of key and office going system. So, In this paper, We developed hardware and software that could do many function as one card. We trying to unite the functions of key and card into one card. In this system, it is used by individual credit card. We have no doubt the usefulness of this system for building and offices security system and office going system, etc.