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선박 유압공급 장치용 사판식 유압 피스톤 펌프의 구조적 안정성에 관한 연구
곽범섭(Beom-Seop Gwak),임종학(Jong-Hak Lim),이인욱(In-Wook Lee),이중섭(Chung-Seob Yi),이호성(Ho Seong Lee),송철기(Chul Ki Song) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.4
In this paper, a structural stability analysis of the swash plate hydraulic piston pump installed on hydraulic supply systems in marine vessels is presented. In order to verify the integrity of the pump design, a standard structural analysis technique based on the finite element method has been applied for various operating and boundary conditions. For the maximum operational torque (223 N·m) at 5°, 10°, and 15° of the swash plate angle, the maximum deformation, equivalent stress and safety factor are evaluated. The analytical results show that under current operating conditions, the structural reliability of the design has been confirmed.
선박 유압공급 장치용 사판식 유압 피스톤 펌프 내부 유동해석에 관한 연구
이중섭(Chung-Seob Yi),이정실(Jeong-Sil Lee),임종학(Jong-hak Lim),곽범섭(Beom-Seop Gwak),이호성(Ho Seong Lee),송철기(Chul Ki Song) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.1
In this paper, a flow analysis of a swash-plate type hydraulic piston pump installed on a hydraulic flow supply system for marine vessels is presented. A model and governing equations for computational fluid dynamics (CFD) analyses of swash-plate type hydraulic piston pumps were built, and simulation results regarding the internal flow field of the pump were obtained. By analyzing the internal flow of the swash-plate type hydraulic piston pump, we can confirm the time-dependent stroke of each piston as the pump rotates. We also verified that by analyzing the pulsating flow against the slope of the swash plate, the simulation results match well with the experimental results. The natural frequency of the system was computed to be approximately 380 Hz by applying and analyzing the fast Fourier transform (FFT) of each swash plate slope evaluated.
승용차 자동변속기용 트랜스퍼 드라이브 기어 베어링의 효율개선 방법에 관한 연구
이인욱(In Wook Lee),한성길(Sung Gil Han),곽범섭(Beom-Seop Gwak),이호성(Ho Sung Lee),송철기(Chul Ki Song) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.3
An automatic transmission of automobiles enables comfortable driving experience with lower transmission shifting jerks. However, the assembly structure is more complicated and requires additional components with lower efficiency than the manual transmission system. Extensive research has been conducted to improve the overall transmission efficiency by optimizing each component of the automatic transmission assembly. This study focuses on enhancing the friction torque of double angular contact ball bearings used in automatic transmission. The friction torque of the bearing varies with the operating conditions such as the operational load and rotating speed. Since reducing the friction torque of the bearing tends to deteriorate the durability of the bearing, it is necessary to design the bearing having a minimum required friction torque by determining the durability life of an automatic transmission assembly, In this study, the theoretical life and friction torque of conventional and newly-developed bearings are calculated. The difference in the friction torque between the new and existing bearings are also evaluated.