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관입시험법에 의한 콘크리트 압축강도 추정식의 제안에 관한 연구
신정식,이성용,권영웅 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
This study concerns the new strength equation of concrete by penetration test. There are not only few estimate strength equations of concrete, but also many problems to apply them because of time, cost, easiness, structural damage, reliability and so on. For this study, there performed a series of test and proposed a equation as follows; fc = 1670 - 106d + 1.81d² here, fc : estimated compressive strength of concrete by kgf/cm² d : Probe exposed of concrete by mm.
Digital PLL을 利用한 誘導電動機 速度 制御 System의 인버어터 出力 波形 改善에 關한 硏究
柳喆魯,李公熙,李星龍 全北大學校 1985 論文集 Vol.27 No.-
The inverter design for improving current waveforms using only reactors and capacitors is described. Some effects of harmonics on induction motor is reduced when the improved inverter applied to digital PLL speed control system. This paper also presented a determinating method of dynamic response and stability of system using microprocessor-based digital filter. Excellent speed regulation was obtained by the improved control system.
入力電流의 高調波 低減을 위한 새로운 다이리스터 整流回路의 개발
柳喆魯,金聖中,李公熙,李星龍,高榮浩 全北大學校 1987 論文集 Vol.29 No.-
The harmonics involved in input AC line currents of thyristor rectifier apparatus have recently been a serious problem in the cause of burning power condenser, mis-action of UFR(protective relay), and trouble of the automatic voltage controller, etc, in the sending or distribution electric power system. As an effective counter-measure for this, the method of having switching taps on the conventional interphase reactor and its artificial utilization have been adapted, as we know. The conventional 3 tap method, however, is not achieved an effect of reducing harmonics under firing angle 15˚. In this paper, a new method of reducing harmonics involved in input AC line currents or output DC voltage of rectifier circuit is presented, which is due mainly to the equipment of the 2-3 switching taps on interphase reactor. Thereofre, main contents of this study are the following three items; 1) optimal number of taps 2) optimal turn ratio of interphase reactor 3) optimal control angle of interphase reactor.