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조재천(Jaecheon Jo),사정환(Junghwan Sa),이강훈(Kanghun Lee),이윤권(Yoonkwon Lee),이기주(Kiju Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Failure of the exhaust pipe can cause air pollution by reducing ability of exhaust gas purification and can cause noise pollution and ride quality degradation by reducing ability of noise isolation. Therefore, it should ensure high reliability of the product to meet the growing environmental regulations and the needs of consumers. However, under actual conditions of use, it spends a lot of time and cost in order to develop products of high reliability. Therefore, accelerated life test to estimate the relationship between stress and life is performed to predict the actual life from the observed data through tests of the product by promoting the failure of products in severe conditions than real use conditions. The purpose of this study is estimating lifetime of exhaust pipes through statistical analysis and to evaluate average life in short term. This study was applied by the statistical analysis method of ASTM E739.
조재천(Jaecheon Jo),문남수(Namsu Mun),이기주(Kiju Lee),한인수(Insu Han),김종일(Jongil Kim),김희진(Heejin Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Failure of the exhaust pipe can cause air pollution by reducing ability of exhaust gas purification and can cause noise pollution and ride degradation by reducing ability of noise isolation. Therefore, it should ensure high reliability of the product to meet the growing environmental regulations and the needs of consumers. However, under actual conditions of use, it spends a lot of time and cost in order to develop products of high reliability. Therefore, accelerated life test to estimate the relationship between stress and life is performed to predict the actual life from the observed data through tests of the product by promoting the failure of products in severe conditions than real use conditions. The purpose of this study is estimating lifetime of exhaust pipes through accelerated life test and to evaluate average life, failure rate and etc. in short term.
Lubrication characteristics of dual piston ring in bent-axis type piston pumps
조인성,백일현,JaeCheon Jo,박주미,오석형,정재연 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.6
The bent-axis type of piston pump driven by the piston rod works by the piston rod driving the cylinder block; because of this the taper angle of the piston rod and the swivel angle between the cylinder block and the shaft are important design factors. If these factors cannot satisfy the conditions for optimum design, the friction loss between the cylinder bore and the piston increases, and the pump can fail to work under conditions of severe friction and wear. Since the piston reciprocates in the cylinder bore with high velocity, at the same time rotating on its own axis and revolving on the center of the cylinder block, a decrease of the volume efficiency is generated because of the leakage between the cylinder bore and the piston. Therefore, to prevent this, the piston ring is designed to be at the end of the piston, and the friction characteristics between the piston ring and the cylinder bore require further research due to their great influence on the performance of the piston pump. Thus, in this paper, the elastohydrodynamic lubrication (EHL) analysis of the film thickness, the pressure distribution, and the friction force, have been studied between the piston ring and the cylinder bore in the bent-axis type of piston pump. The analyzed results show that the friction force is influenced by the rotating speed and the discharge pressure.
상용차용 디스크 브레이크 제동시 열적거동 및 응력해석에 관한 연구
임강현(Kanghyoun Yim),백일현(Ilhyun Baek),조재천(Jaecheon Jo),문남수(Namsoo Moon),전남진(Namjin Jeon) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Disc brake fixed to the axle with disc brakes and brake lining is a part of braking systems in commercial vehicle and is a tool to stop rotating squeezed. Specifications of the vehicle brake system, brake conditions, environmental conditions and the geometry of the disk and the pad, material properties and cooling conditions, etc. are made in the form of very complex. So there are many constraints on the theoretical approach. In addition, the actual analysis to verify these systems caused by a lot of trial and error must occur is difficult . The purpose of this study is to grasp the parameter affected to design of disc brake through analysis of heat stress applied to the temperature distribution, direction and scale of heat flow, analysis of heat trasnfer.
박종호(Jongho Park),조태영(Taeyeong Jo),김차식(Chasik Kim),문덕수(Deoksu Mun),이재천(Jaecheon LEE) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This study evaluated features of existing circuits through the simulation experiment of the ARS (Active Roll Stabilizer) oil pressure circuit and suggested a possibility to replace it with a new circuit. Because the exisitng anti-roll method which adopted a stabilizer bar and an active susppension system of the pressed oil type provides poor comfortness on riding and causes excessive energy loss, ARS system is becoming more frequently applied. We did a modelling for the ARS oil pressure circuit of the currently generalized HYDAC model using the AMESim program, and proceed vehicle dynamic modelling with the Matlab. When we simulated this constructed ARS oil pressure circuit system and performed a practical car test, we could achieve a similar result. In addition, we also suggested a replace circuit in which a proportional reduction valve was used in order to enhance the loalization of the HYDAC model. The simulation results proved that the newly proposed system was sufficiently comparable to the existing products.
자동차용 유압 베인 펌프의 기동 시 베인과 캠링의 이간
정재연(JaeYoun Jung),조인성(IhnSung Cho),백일현(IlHyun Beak),조재천(JaeCheon Jo),송규근(KyuKeun Song),오석형(SeokHyung Oh) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
In an oil hydraulic vane pump for automobile, it is very important that the vane doesn't have to be separated from the camring inner race in operation of the vane pump. Generally, the vane has not only the oil hydraulic force acting on the bottom face to contact camring inner race but also inertial force and viscous force. Because the oil hydraulic force is much larger than the other forces, the contact state between the vane tip and the camring inner race is good. However, in the starting of the vane pump, because the oil hydraulic force acting on the vane is zero, the contact state between the vane tip and the camring inner race is affected with only the other forces. If the viscous force larger than the inertial force, because the vane is separated from the camring inner race, the suction and delivery of the vane pump can be unstable or impossible. Therefore, in this paper, the state of the contact between the vane and the camring is considered. The results show that the rotating speed of the shaft, the operating temperature of the oil, the clearance between the vane and the rotor and the mass of the vane exert a great influence on the state of the contact between the vane and the camring.