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Hanwook Jeon(전한욱),Taewook Lee(이태욱),Chansun Lim(임찬선) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Simple and efficient algorithm is developed to identify the unbalance distribution of rigid rotor supported by active magnetic bearings (AMB). The complex unbalances are obtained by solving the simultaneous equations formulated with influence coefficient matrices associated with bearing stiffness and damping matrices. The algorithm takes advantage of AMB’s ability to adjust the bearing stiffness and damping through feedback control. The algorithm is applied to a rigid rotor-AMB system and its validity is demonstrated numerically.
메탄계 가스의 Two-Phase Flow 현상에 따른 가스 익스팬더 성능 및 유동 특성 분석
신봉근(Bong Gun Shin),조연화(Yeonhwa Cho),임찬선(Chansun Lim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
In recent, the use of expander at a re-liquefaction system installed at LNG Ships is continuously increasing in order to improve the system performance. Expander used at the reliquefaction system can drop the temperature of the working fluid at the system exit to a lower level than JT valve and can reduce the power consumption of the system by using the energy generated during expansion process. The performance of the re-liquefaction system improves as the expander expansion ratio increases, which results in a two phase flow of working gas inside the expander. This working gas two phase flow reduces the expander’s aerodynamic performance and deteriorates the structure / dynamic characteristics. Therefore, it is very important to analyze the influence of the two phase flow on flow and performance characteristics of the expander. However, it is very difficult to investigate the effect by using previous the numerical methodologies due to complicated numerical models and high computation costs. In this study, the influence of the two phase flow on the flow and performance characteristics of expander using methane-based mixed gas as working gas were analyzed. Next, the new numerical methodology was suggested in order to reduce the computational cost and to improve the accuracy.