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암석발파시 순발뇌관과 지발뇌관이 발파진동에 미치는 영향
안도원,강추원,강대우 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.1
Most of the good construction sites have already been developed. Therefore, more and more developers are looking for hills and mountains to build housing complexes as well as commercial buildings. A blasting is necessary for that purpose. But a major concern with blasting in urban area is possible ground vibrations and their harmful effects on nearby structures. Therefore blasting in the developed area must be cautious. Because blasting goes along with vibrations, it is important to decrease the level vibrations. The purpose of this study is to obtain a way to decrease vibrations by controlling detonators. Many blasts were instrumented and monitored at two construction sites in Pusan. The data were analyzed for peak values of vibration and frequency content. Vibrations were analyzed and differences between instantaneous and delay detonators were measured. Conclusions of this study are summarized as follows : ① Vertical component of the peak velocity was the largest among three components. ② Deci-second detonator resulted in the lowest peak velocity. ③ In order to reduce vibrations, DS detonators can be recommended for rock blasting.
상자식 농수산물 건조기의 열풍 균일분배구조 실현을 위한 유동해석
엄용균,안도원,천성국,서태원 대한설비공학회 2006 설비공학 논문집 Vol.18 No.1
Both the computational and experimental analysis have been conducted in this study to develop the high efficiency agriculture products dryer by the uniform thermal flow distribution in the drying room. It has been developed based on the results of the computation and experiment in the conventional dryer to improve the thermal flow distribution in drying room. The developed dryer can be prevented the local concentration of the heated wind and achieved the uniform flow distribution using the installation of vertical branch ducts, ribs, guide vanes and porous plates. As a result, the developed dryer reduced the fuel consumption up to 15% and the electricity consumption up to 31.5% compared with the conventional dryer.