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조재웅,민병상,한문식,Cho, Jae-Ung,Min, Byoung-Sang,Han, Moon-Sik 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.1
This study analyzes the result with dynamic simulation about deformation according to time when a car impacts bollard. These results are shown as followings. The maximum deformation is shown at the lower part of front grass in case of the impact of front or passenger seat but this deformation is shown at the lower part of rear bumper in case of double impact. The maximum equivalent stress is shown at the upper part by the side grass of driver seat at the elapsed time of 0.00075 second after impact in case of the impact of front or passenger seat but this deformation is shown at the front bonnet at the elapsed time of 0.004 second after the additional impact in case of double impact. The maximum total deformation or equivalent stress is shown nearly same in case of the impact of front or passenger seat. But the value of this deformation or equivalent stress in case of the impact of front or passenger seat is shown with 2 times or more than 17% respectively as this value in case of double impact.
조재웅,한문식,Cho, Jae-Ung,Han, Moon-Sik 한국생산제조학회 2010 한국생산제조학회지 Vol.10 No.6
The capability of automotive suspension system depends on steering safety of knuckle and lower control arm. In this study, light weight is applied with lower arm by the material of aluminium alloy. Distributed stress, fatigue life and proper vibration are analyzed with multiple loads happened by automobile. The durability of lower arm can be verified by the result of structural analysis.
조재웅,한문식,Cho, Jae-Ung,Han, Moon-Sik 한국생산제조학회 2010 한국생산제조학회지 Vol.10 No.6
This study analyzes the results with the simulation of heat transfer, structural stress, fatigue and vibration on main parts of engine. The maximum temperature is shown by $300.73^{\circ}C$ on the upper part of piston with the heat transfer. Maximum total deformation or equivalent stress is shown by 65.31mm or 21364MPa respectively at the upper plane of piston with the structural analysis inclusive of heat transfer. The minimum life is shown by the cycle less than $10^7$ at the part of crankshaft with the fatigue analysis. The frequency with the maximum amplitude of deformation is shown by 14Hz. Maximum total deformation or equivalent stress is shown respectively by 93.99mm on the upper plane of piston or 42625MPa at the part connected with crack shaft and connecting rod at 14Hz. The durability of engine design can be verified by using the analysed result of this study.
조재웅,한문식,Cho, Jae-Ung,Han, Moon-Sik 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.1
The variable fatigue load is simulated in this study. The stability and the life of the material are analyzed theoretically by Ansys program. These results are successfully applied to the practical wheel to predict the prevention of fracture and the endurance. The life and the damage on the every part of the fatigue specimen can be predicted. As the available lives are compared for every loading variation, the rain flow and damage matrix results can be helpful in determining the effects of small stress cycles in any loading history. The rainbow and damage matrices illustrate the possible effects of infinite life. The safety and stability of wheel and the other practical structures according to the variable load can be estimated by using the results of this study.
조재웅,한문식,Cho, Jae-Ung,Han, Moon-Sik 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.4
This study investigates the stress at gear by modelling differential gear and using FEM. When gear is driven under power, high equivalent stress of 1596.2MPa is occurred at the stationary shaft. Maximum equivalent stress of 1596.2MPa is also occurred at the bottom and root of tooth and its fatigue life becomes 12.4 as the shortest cycle. As much as it becomes away from the center of gear, the maximum deformation becomes occurred. As exact power is delivered with the precise design of gear, the loss of power energy can be decreased.
조재웅,권오범,한문식,Cho, Jae-Ung,Kwon, Oh-Beom,Han, Moon-Sik 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.3
This paper describes the analysis of state when load applies to McPherson strut assembly. Strut assembly except knuckle-arm are created with 3 dimensional modeling program. Stress and structural strength on this model are analyzed by analysis program as load applies on the lower part of assembly modeling. When McPherson suspension is applied with 3000N at Z direction, maximum stress at spring becomes 433MPa and the cycle of minimum life is 4321. The designed modeling suspension at this study has no possibility with resonance.
조재웅(Jae-Ung Cho),한문식(Moon-Sik Han) 한국기계가공학회 2010 한국기계가공학회지 Vol.9 No.6
In this study, the deformation and stress are analyzed through modal and harmonic response analysis at resonance on leaf spring. The displacement range of 7 to 14 ㎜ is shown at natural frequencies as 6 kinds of resonance modes. The maximum deformation is shown as 8.8781㎜ at Mode 2. The maximum displacement and stress at leaf spring are shown as 0.0458 ㎜ and 72.533 MPa respectively on 1200 ㎐. The comfortability of passenger becomes better on leaf spring at suspension system by use of this design model.
조재웅(Jae-Ung Cho),한문식(Moon-Sik Han) 한국기계가공학회 2010 한국기계가공학회지 Vol.9 No.1
The air resistance about automotive body is studied by the flow analysis in this study. Maximum air flow velocity is shown with 28 to 30 ㎧ on the upper roof of automotive body. The air flow becomes most regular at automotive body model 3 but the model of 2 or 3 becomes irregular in comparison with the model 1. The maximum air resistance pressure is shown with 413 to 420 Pa at the front bumper of automotive body. The flow velocity at inlet or middle plane of automotive body is shown as the contour same with the model of 1, 2, or 3. But the velocity at outlet plane at model 1 is shown as the contour different with the model of 2 or 3.
조재웅(Jae-Ung Cho),한문식(Moon-Sik Han) 한국기계가공학회 2010 한국기계가공학회지 Vol.9 No.2
The thickness of original hinge model is changed for structural stability in this study. The front end with the largest deformation of 9.8813 ㎜ or the rear middle part with the largest equivalent stress of 6082.6 ㎫ is respectively shown at door hinge. The lower part of joint pin head with the largest deformation of 0.17499 ㎜ and the largest equivalent stress of 1540.2 ㎫ are shown. The advanced model with more thickness and stability is shown to have smaller displacement in half and smaller equivalent stress by 3 times by comparing with the original model.
조재웅(Jae-Ung Cho),한문식(Moon-Sik Han) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.1
This study is to analyze the internal flow at the inside of computer case which is commonly used. The inner configuration are modelled and simulation analysis is done by ANSYS-CFX. Dead volume is happened according to the positioning of VGA and HDD. The advanced model is suggested by removing this volume and making the smooth cooling flow. This model is formed with the constraint conditions same as the existing model. As compared with the existing model, flow configuration is different and the average temperature becomes lower through flow analysis about the advanced model.