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한문식(Moon-Sik Han),조재웅(Jae-Ung Cho) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.1
This study investigates the durability of the radiator and cooler of a laptop through a thermal analysis. In the result of this study, the maximum deformation happened at the part holding up the support stand at the radiator and cooler. The maximum thermal stress of the cooler was 60.939 ㎫, as low as that of the radiator. In addition, the safety factor of the cooler was 1.64 times as high as that of the radiator. The radiator of the laptop was less durable than the cooler. The result of this study could help with designing a laptop model with a durable radiator and cooler.
한문식(Moon-Sik Han),조재웅(Jae-Ung Cho) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.6
This study analyzes stress, fatigue and vibration on main rotor and body of helicopter. The maximum stress is shown on adjoint part between body and main rotor at the lower position of main rotor. As the maximum displacement amplitude is happened at 4000Hz, there is no resonance and the state of helicopter becomes safe at hovering without the abnormal air current and the disabled rotor. Among the cases of nonuniform fatigue loads, "SAE bracket history" with the severest change of load becomes most unstable but "Sample history" becomes most stable. In case of "Sample History" with the average stress of 0MPa to -105MPa and the amplitude stress of 0MPa to 8.539×105MPa, the possibility of maximum damage becomes 3%. This stress state can be shown with 5 times more than the damage possibility of "SAE bracket history" or "SAE transmission". The structural result of this study by using the analysis of vibration and fatigue can be effectively utilized for safe and durable design of helicopter.
A Study of Strength Property and Durability on Automotive Front Bumper Guard by Configuration
Moon-Sik Han(한문식),Jae-Ung Cho(조재웅) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.3
The automotive front bumper guard is the most important part of the vehicle for protecting the life of driver when a traffic accident happens. In order to ensure safe driving, this part must possess sufficient strength and durability. This study was carried out with structural and fatigue analyses by designing front bumper guard models. After the lowest value for maximum total deformation and equivalent stress was found through structural analysis and the highest value for fatigue life was found for all three models, it was shown that the type C front bumper guard model was the most suitable for application to a real car. The strength property and durability of the optimum design were determined through this study"s results.
한문식(Moon-Sik Han),조재웅(Jae-Ung Cho) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.2
This study analyzes about poclain bucket through fatigue durability analysis. Maximum equivalent stress and total deformation are shown at the lower of bucket and edge part respectively. Among the cases of nonuniform fatigue loads, "SAE bracket history" with the severest change of load becomes most unstable but "Sample history" becomes most stable. In case of "Sample history" with the average stress of -10000Pa to 5000MPa and the amplitude stress of 0 to 6000MPa, the possibility of maximum damage becomes 3%. This stress state can be shown with 5 or 6 times more than the damage possibility of "SAE bracket history" or "SAE transmission". The structural result of this study can be effectively utilized with the design of poclain bucket by investigating prevention and durability against fatigue damage.
한문식(Moon-Sik Han),조재웅(Jae-Ung Cho) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.6
This study investigates stress and deformation due to static and dynamic vibration analysis about various types of bike handles installed with smart phone depositories. When force is applied on the side of handle at the models of type 1, 2, 3 and 4, the maximum equivalent stress is highest at type 2. The stress or deformation becomes lowest among these 4 model types. At vibration analysis, type 1 becomes safest within the range of 500Hz and type 3 becomes stable within the range of 100Hz. The result of this study can be applied with the design of bike handle installed with smart phone depository. The damage or deformation due to vibration can be prevented when the bike falls down. This result can be widely utilized to investigate and predict the durability.
한문식(Moon-Sik Han),조재웅(Jae-Ung Cho) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.1
In this study, the thermal performance of disk can be compared with disk and disk with holes through numerical analysis. The capacity of thermal emission on general disk becomes more than on disk with holes at the distribution of temperature at first and the magnitude of equivalent stress on general disk becomes less than on disk with holes at the distribution of stress. The capacity of thermal emission or the magnitude of thermal deformation on disk with holes becomes less than that on general disk 30 minutes later. The disk with holes is worn less and more durable than general disk. The performance of cooling and braking force at disk and pad can be improved by installing the disk with holes.
한문식(Moon-Sik Han),조재웅(Jae-Ung Cho) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
This study analyzes flywheel through the analyses of stress, fatigue and vibration. Maximum equivalent stress is 15.271MPa at the mid round shape and maximum deformation is 0.02264mm at the outer teeth. Among the cases of nonuniform fatigue loads, "SAE bracket history" with the severest change of load becomes most unstable but "Sample history" becomes most stable. In case of "Sample history" with the average stress of -104MPa and the amplitude stress of 1000 to 2900MPa, the possibility of maximum damage becomes 30%. This stress state can be 20 times greater than the damage possibility of "SAE bracket history" or "SAE transmission". The range of natural frequencies becomes 200 to 820Hz and the values of these deformations are not more than 10mm. The structural result of this study can be effectively utilized with the design of flywheel by investigating prevention and durability against its damage.
한문식(Moon-Sik Han),조재웅(Jae-Ung Cho) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.1
This study aims at structural analysis with fatigue on the shock absorber mount of automobile. Two kinds of mount as original model 1 and reinforced model 2 are applied. Among the cases of nonuniform fatigue loads at both models, ‘SAE bracket history’ with the severest change of load becomes most unstable but ‘Sample history’ becomes most stable. In case of ‘SAE bracket history’ or ‘SAE transmission’, the maximum fatigue life at model 2 is 5 to 6 times as much as model 1 and the minimum damage at model 2 is decreased 5 to 6 times as much as model 1. In case of ‘Sample history’ as slow fatigue loading history, the minimum damage at model 2 becomes same as model 1 but the maximum fatigue life at model 2 is decreased more than 17 times as much as model 1. In case of ‘Sample History’ with the average stress of -104MPa to 104MPa and the amplitude stress of 0MPa to 104MPa, the possibility of maximum damage becomes 3%. This stress state can be shown with 5 times more than the damage possibility of ‘SAE bracket history’ or ‘SAE transmission’. Safe and durable design of shock absorber can be effectively improved by using this study result on mount frame.