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최병희(B. H. Choi),조예찬(Y. C. Jo),박정현(J. H. Park),최성운(S. W. Choi),조상훈(S. H. Cho),김바다(B. D. Kim),박기협(K. H. Park),김주호(J. H. Kim),이대엽(D. Lee) 유공압건설기계학회 2023 유공압건설기계학회 학술대회논문집 Vol.2023 No.5
In many equipment, including construction machinery that operates with hydraulic oil, it is very important to solve the problem of the generation of fine particles in the hydraulic circuit and the inability to use the equipment due to causes such as damage of parts and repair. In this study, as a base study to solve these problems, a study that can detect the color change of hydraulic oil due to particles mixed in hydraulic oil in real time using machine learning was conducted. Using the k-NN classification algorithm, the color change of hydraulic oil is classified into ten classes so that the color can be recognized in real time. It is planned to carry out the development of the sensor system in the following study.
박정현(J. H. Park),최병희(B. H. Choi),최성운(S. W. Choi),조상훈(S. H. Cho),이재혁(J. H. Lee),이주연(J. Y. Lee),인수환(S. H. Ihn),이대엽(D. Lee) 유공압건설기계학회 2023 유공압건설기계학회 학술대회논문집 Vol.2023 No.5
As the logistics industry continues to grow, the use of unmanned equipment such as unmanned pallet trucks is increasing. In this study, a path control study was conducted using a three-wheeled pallet truck rig with driving power of 1,500 W and steering power of 400 W using MPC (Model Prediction Control) algorithm for path control of a three wheel unmanned pallet truck. Through the analysis, the main control variables of the driving and steering motors were created based on the main path coordinates, and using this, it was confirmed that the driving of the element motion required in the pallet work was possible by following the main coordinates given through the driving experiment. In the future, based on this study, we plan to conduct research that adds dynamics modeling and further enhanced control.
이재혁(J. H. Lee),조예찬(Y. C. Jo),장재원(J. W. Jang),고경주(K. J. Ko),박정현(J. H. Park),최병희(B. H. Choi),최성운(S. W. Choi),조상훈(S. H. Cho),이대엽(D. Lee) 유공압건설기계학회 2023 유공압건설기계학회 학술대회논문집 Vol.2023 No.5
The use for driving robots is increasing in tests of electric construction machinery and automotive using chassis dynamometer that require long hours of operation in order for battery SOC tests. Existing driving robots are not very convenient, such as taking a lot of time to install. Therefore, in this study, basic research was conducted for the development of a driving robot that reduced the installation time and improved the followability of the reference speed profile by using deep learning. In order to follow the speed profile of the standard test cycle according to the regulations, a base study that can control the throttle by using the visual information in real time was conducted using a rig device and deep learning. Based on the results of this study, it is planned to conduct follow-up studies using test vehicle and chassis dynamometer in the next stage.
C200 마르에이징강의 기계적성질에 미치는 Nb 첨가량 및 시효처리의 영향
장경천(K.C. Jang),최병희(B.H. Choi),최병기(B.K. Choi) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
Objective of this study was effects of Nb(Niobium) contents and age hardening conditions on the strength of C200 maraging steel which are commonly using in aircraft, space field, nuclear energy, and vehicle etc. To investigate the effects, steel was manufactured by a VIM (Capacity: 30㎏f, Max Temp. : 1650℃, 10?³? Torr, 45 min/charge) added 0%, 0.03%, and 0.06% niobium with basic chemical compositions. And the steel was hot rolled automatically, solution annealed at 815℃ for I hour, and age hardened with 48%KNO₃+52NaNO₃ at 455℃, 482℃, and 510℃ for 1,2,4, and 8 hours each other. The most excellent condition for elongation was 0.03% Nb material aged at 455℃ for 1 hour having about 97% of base metal. The most excellent aging condition was 8 hours aged at 482℃ with 0.06% Nb content showing that the strength of the specimen increased twice more than that of the base metal.
C200 마르에이징강의 기계적성질에 미치는 Nb 첨가량 및 시효처리의 영향
장경천(K.C. Jang),최병희(B.H. Choi),최병기(B.K. Choi) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.10
Objective of this study was effects of Nb(Niobium) contents and age hardening conditions on the strength of C200 maraging steel which are commonly using in aircraft, space field, nuclear energy, and vehicle etc. To investigate the effects, steel was manufactured by a VIM (Capacity: 30㎏f, Max Temp. : 1650℃, 10?³? Torr, 45 min/charge) added 0%, 0.03%, and 0.06% niobium with basic chemical compositions. And the steel was hot rolled automatically, solution annealed at 815℃ for I hour, and age hardened with 48%KNO₃+52NaNO₃ at 455℃, 482℃, and 510℃ for 1,2,4, and 8 hours each other. The most excellent condition for elongation was 0.03% Nb material aged at 455℃ for 1 hour having about 97% of base metal. The most excellent aging condition was 8 hours aged at 482℃ with 0.06% Nb content showing that the strength of the specimen increased twice more than that of the base metal.
장경천(K.C. Jang),국중민(J.M. Kuk),최병희(B.H. Choi),정재강(J.K. Chung),최병기(B.K. Choi) 한국생산제조학회 2004 한국생산제조시스템학회 학술발표대회 논문집 Vol.2004 No.4
Effects of Nb(Niobium) contents and solution annealing on the strength and fatigue life of 18%Ni maraging steel commonly using in aircraft, space field, nuclear energy, and vehicle etc. were investigated. Also the fatigue life stress intensity factor were compared experiment result and FEA(finite element analysis) result. The more Nb content, the higher or the lower fatigue life on base metal specimens or solution annealed specimens showing that the fatigue life was almost the same. The maximum stresses of X, Y, and Z axis direction showed about 2.12×10²㎫, 4.40×10²㎫ and 1.32×10²㎫ respectively. The Y direction stress showed the highest because of the same direction as the loading direction. The fatigue lives showed about 7% lower FEA result than experiment result showing almost invariable error every analyzed cycle. Stress intensity factor of the FEA result was lower about 3.5~10% than that of the experiment result showing that the longer fatigue crack length, the higher error. It considered that the cause for the difference was the modeled crack tip having always the same shape and condition regardless of the crack growth.
장경천,국중민,최병희,정재강,최병기 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
Effects of Nb(Niobium) contents and solution annealing on the strength and fatigue life of 18%Ni maraging steel commonly using in aircraft, space field, nuclear energy, and vehicle etc. were investigated. Also the fatigue life stress intensity factor were compared experiment result and FEA(finite element analysis) result. The more Nb content, the higher or the lower fatigue life on base metal specimens or solution annealed specimens showing that the fatigue life was almost the same. The maximum stresses of X, Y, and Z axis direction showed about 2.12×10²MPa, 4.40×10²MPa and 1.32x10²MPa respectively. The Y direction stress showed the highest because of the same direction as the loading direction. The fatigue lives showed about 7% lower FEA result than experiment result showing almost invariable error every analyzed cycle. Stress intensity factor of the FEA result was lower about 3.5~10% than that of the experiment result showing that the longer fatigue crack length, the higher error. It considered that the cause for the difference was the modeled crack tip having always the same shape and condition regardless of the crack growth.