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정상현(S. H. Jeong),김용진(Y. J. Kim),이성범(S. B. Lee),김택중(T. J. Kim),전재모(J. M. Jun),이상기(S. K. Lee),정해동(H. D. Jeong),홍영기(Y. K. Hong),송인희(I. H. Song),류정인(J. I. Ryu) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
The main feature of electret is their ability to remove particulate matter from polluted air by strong electrostatic forces generated by the electret fibers from which they are made. High voltage corona discharge methode were used to made electret filter, and the performance characteristics of electret filter were measured by Filter Tester(TSI, Model 8130). Tests against various conditions shown that electret filters capture fine dust particles very effectively, while offering minimum of flow resistance.
다공형상이 존재하는 가압기의 피로수명평가 및 응력분류선 유효성 분석
최신범(S.B. Choi),박영재(Y.J. Park),장윤석(Y.S. Chang),최재붕(J.B. Choi),김영진(Y.J. Kim),이진호(J.H. Lee),정해동(H.D. Jeong),설광원(K.W. Seul) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The present research deals with stress analyses and fatigue life evaluation of a new complex pressurizer that includes perforated parts due to various piping and subcomponents. At first, preliminary two- and three-dimensional finite element analyses were carried out to assess the feasibility of an effective elastic modulus. Then, the appropriateness of stress classification line prescribed in ASME Sec. Ⅲ & Ⅷ and WRC Bulletin 429 as non-mandatory appendices was reviewed. Finally, after categorizing stress components, the stress intensities and cumulative usage factors at critical points of pressurizer were calculated through main analyses and compared with corresponding allowable design criteria in ASME code.