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박진길(J.G.Park),한봉주(B.J.Han),정주윤(J.Y.Chung),유기선(K.S.Yu),김항배(H.B.Kim) 한국해양대학교 해사산업연구소 1992 海事産業硏究所論文集 Vol.2 No.-
The propulsion marine diesel engine have been widely applied with a mechanical-hydraulic governor to control the ship speed for long time. Recently, it was very difficult for the mechanical-hydraulic governor to control the speed of engine under the condition of long stroke, low speed and a few cylinder because of jiggling and hunting. In order to remove these difficulties the digital governor system is adapted for the speed control of a low speed marine diesel engine. But there is the problem of confidence in digital governor systems due to low reliability of electronic parts under the bad condition such as high temperature, salty, watery air and intensive viberation in engine room. To solve the these problems of control system, the performance improvement of mechanical-hydraulic governor is required. In this paper, it is analyzed how much influence is given by a parameter variation of mechanical hydraulic governor for the speed control system by utilizing the Nichols chart, and the optimal parameters are investigated through the computer simulations. The performance improvement of a conventional mechanical hydraulic governor is confirmed to be possible by the above studies.
직렬 브리지형 인버터에 의한 단상 유도전동기의 속도제어에 관한 연구
박진길(J.G.Park),정병건(B.G.Jung),한봉주(B.J.Han),정주윤(J.Y.Chung),정삼식(S.S.Jung) 한국해양대학교 해사산업연구소 1993 海事産業硏究所論文集 Vol.3 No.-
The application of A.C. motor to servomotor is rapidly increased according to the recent advance of power electronics and digital control techniques. The induction motor is widely used in the industrial field for the variable speed and position control because of its simple structure and easy maintenance. In this paper, the speed of single phase induction motor driven by full bridge inverter is controlled by a PID controller under the condition of stepwise disturbance load changes, and the current characteristics of the system is investigated to look for the good properties of A.C. motor torque through the experiment. From the experimental results. it is confirmed that the speed of single phase induction motor driven by full bridge series inverter can be smoothly controlled by an analog PID controller.