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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.
박진길(J.G.Park),정주윤(J.Y.Chung),강창남(C.N.Kang),박재식(J.S.Park),김항배(H.B.Kim) 한국해양대학교 해사산업연구소 1993 海事産業硏究所論文集 Vol.3 No.-
The application of A.C. motor as'servomotor is rapidly increased with the recent advance of power electronics and digital control methods. The induction motor which has a simple structure and needs less maintenance is used in the industrial field for the variable speed and position control. In this paper. the current characteristics of the system composed of R.L.C. load and series bridge inverter is investigated through the results of computer simulation and experiment to look for the good properties of A.C. motor driven by the above inverter. The time schedule of conventional bridge inverter and the parameters such as resistance and damping coefficient of load is changed for good results. It is possible to get the load current of similar sine wave under various conditions.