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Dual-PDA를 이용한 절삭유 에어로졸 특성분석에 관한 연구(II) - 선삭공정의 절삭유 에어로졸 예측
정의식,황덕철,우창기,황준,Chung, E.S.,Hwang, D.C.,Woo, C.K.,Hwang, J. 한국액체미립화학회 2005 한국액체미립화학회지 Vol.10 No.2
This paper presents the analytical approaches to predict cutting fluid aerosol formation characteristics in machining process. The prediction model which is based on the rotary atomization theory analyzes aerosol behaviors in terms of size and concentration. Experiments were tarried out to verify the aerosol formation prediction model under various operational conditions. The experimental results which are obtained by Dual-PDA measurement show resonable agreement with prediction results of aerosol concentration. This study can be provided as a basis to estimate and control the hazardous cutting fluid aerosol in machining process in view of environmental consciousness.
초음파 진동계에서 나사결합형 Stepped Horn의 특성에 관한 연구
정의식 大田開放大學 1984 論文集 Vol.1 No.-
In order to investigate the characteristics of vibration about stepped horn which was jointed with thread, the experiments of the solid type and threaded type were carried out. In experiments, their characteristics of resonant frequency were compared with solid and threaded type, the characteristics of the threaded parts. As the experimental results , the resonant frequency of threaded type was larger than solid type and the resonant frequency was decreased with increased the contacts length.