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장성철(Sung-Cheol Jang),김재웅(Jae-Woong Kim),윤소남(So-Nam Yoon),박중호(Joong-Ho Park),함영복(Young-Bok Ham),김정식(Jung-Sik Kim),김당주(Dang-Joo Kim),최영환(Young-Hwan Choi) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
This study have goal with conceptual design for offshore Structures of high pressure drop control valve for localization. Numerical simulation using CFD(Computational Fluid Dynamic) in order to predict a mass flow rate and a flow coefficient form flow dynamic point of view. The working fluid assumed the glycerin(C3H8O3). Relation with flow and flow coefficient can not be proportional according to inlet pressure when compare with mass flow rate. Because flow coefficient have influence in flow and pressure difference. The structural analysis used ANSYS which is a commercial code. Stress analysis result of internal pressure in valve showed lower than yield strength. This is expect to need more detail design and verification for stem and seat structure.
변위 가정을 이용한 조화맥동 유체력에 의한 배관의 정상상태 진동해석
이성현(Seong Hyeon Lee),정의봉(Weui Bong Jeong),김당주(Dang Joo Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this research, steady state vibration of pipe system caused by fluid force is considered when this system conveys harmonically pulsating fluid. The harmonically pulsating fluid causes stiffness varying frequency of this pipe system becomes to the frequency of fluid pulsating. In case of steady state, the displacement of the pipe system becomes to have strong value at frequency of harmonic pulsating. Time analysis of simple I-DOF(degree of freedom) model is conducted by using displacement assumption. The results of this method is compared with general differential equation solving method.