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Analysis of SLF Interruption Performance in self-blast Gas Circuit Breaker
Jin-gun Park(박진근),Hee-sup Ahn(안희섭),Jongung Choi(최종웅),Younggeun Kim(김영근),Heayong Cho(조해용) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.9
A self-blast type gas circuit breaker has been studied in this study to improve efficiency of interrupting performance of short line fault(SLF). Hot gas flows of gas circuit breaker have been simulated to evaluate interruption performance using CFD. Design parameters such as various types of expansion chamber and nozzles are suggested by using simulation results. Simulated results and experimental ones are compared with previous (ones that of in under development and with capacitor) GCB. Modified new shape of an expansion chamber and nozzle has been suggested to improve the efficiency of gas flow and to provide guidelines for designing self-blast breaker with a higher interruption capability.
박진근(Jin-Gun Park),송현정(Hyun-Jung Song),진다정(Da-Jeong Jin),김지훈(Ji-Hoon Kim),조해용(Hae-Yong Cho) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.5
A pipe is a hollow, long-form part that is primarily used to transport fluids, such as liquids or gases. Pipes are used in a range of applications in different fields from mechanical purposes to architecture and electrical uses. Despite the significance owing to various usability of pipes, few studies have been conducted using the physical property test method. The tensile test is widely used as a method to check the physical properties of the pipe. The existing pipe tension test contains the possibility to cause errors, which are fractures outside the gauge distance and cross-sectional deformation of the pipe. In this study, a novel pipe tension test method using a jig is presented and pipes with various materials are tested. It is expected that the proposed method can reduce errors that occur in conventional pipes and also obtain more accurate values to enable more efficient testing.
신혁수, 김동범, 박진근, 이인환, 조해용 충북대학교 산업과학기술연구소 2013 산업과학기술연구 논문집 Vol.27 No.2
A valve spring retainer is a small disc and located at intake and exhaust valve stem of engine. The retainer supports a valve spring and transmits spring force to a valve. Force is applied to the retainer repeatedly by a rocker arm. Durability of the retainer is an important factor of performance. Weight of retainer affect dynamic performance of engine. Therefore, optimal strength and weight of the retainer design are needed. In this study, stress distribution and fracture load of retainer were analyzed by using FEM to design optimal strength and weight. Static load test was simulated by using commercial FEM code DEFORM-3D. Shapes of the retainer to reduce weight were designed and analyzed to verify validity of it. Simulated results and experimental ones were compared