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김효겸(Hyo-Gyeum Kim),김현수(Hyun-Su Kim),성장현(Jang-Hyun Seong),박준홍(Joon-Hong Park),김형준(Hyoung-jun Kim),이재섭(Jae-Seob Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Cooling tower is a kind of heat exchanger that be widely used in plant or air conditioning apparatus of a large size building. It is fixed above the concrete structure by H-beam support part. Cooling tower support part is designed by according to the spot experience without design plan. In this study, strength evaluation of cooling tower support part is used to finite element analysis. Design factor is selected cross section dimension of beam. It investigated the propriety of the analysis result which uses the solid element and the beam element. Therefore, various cross section dimension of beams show that the volume and the stress decreases.
김형준(Hyoung Jun Kim),박준홍(Joon Hong Park),김현수(Hyun Su Kim),김효겸(Hyo Gyeum Kim),이재섭(Jae Sup Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The mechanical properties of bellows, such as the extensibility and the strength can be changed depending on the shape. For the shipbuilding material, it is desirable that the fatigue life is long due to the elastic property and the reduction of stress in piping system. Nowadays, the domestic production and design of bellows are based on the E.J.M.A. code. However, the design plan is in need because of much errors and lack of detailed analysis. In this study, it is attempted to find out life improvement of U-type bellows using the finite element analysis. Among the design factors, focus on height of convolutions because bellows failure happens first convolution. The results show that as height of first convolutions, the volume and the stress decreases.
통계적 방법을 이용한 선박용 벨로우즈의 형상 최적 설계
김현수(HYUN-SU KIM),김형준(HYOUNG-JUN KIM),김효겸(HYO-GYEUM KIM),이재섭(JAE-SUB LEE) 한국해양공학회 2007 韓國海洋工學會誌 Vol.21 No.5
Bellows are mechanical components which prevent the damage of system by absorption of the vibration and the displacement of axle and radial direction. Thermal piping system is expanded by the fluid of the high temperature from the heat engine inside. At this time, bellows prevent the damage of the piping due to the thermal expansion. Recently, design of bellows is required to fit some other operational environments which are not suggested in the E.J.M.A code book. And it is difficult to produce and to maintain bellows of high temperature and high pressure because of its complicated shape and this causes the manufacturing cost to rise. The objective of this study is to determine optimum shape of bellows which can endure in the high temperature and high pressure. The maximum stress has an effect on the fatigue life of bellows, therefore it needs to be minimized. This study attempts to find a shape which minimizes the stress occurring in the bellows by the design of experiment. The model used in this study is not presented in the E.J.M.A code book, therefore, from the result of design of experiment we find the factors which give effects on the characteristic value and we presents the recession model using the RSM, which can predict the characteristic values depending on the change of factor values.