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백일현(Ilhyun Baek),김지홍(Jihong Kim),조인성(Ihnsung Cho),정재연(Jaeyoun Jung),오석형(Seokhung Oh) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.11
Recently, restrictions of performance, environment and noise on the oil hydraulic system of the heavy construction equipment have been reinforced continuously, so in order to solve these problems, studies on compactness of the ystem, operation under high rotating speeds and pressure, electronic control, substitute oil, and noise reduction have progressed briskly. Of these recent studies, the operation of the system under high pressure has been studied continuously; however, the realization of it is very difficult due to mechanical limitations. For the operation of the hydraulic pump under high pressure, design techniques, manufacturing techniques, and improvement of lubrication performance of the working oil are required. In this study, in order to respond to this demand for high pressure, the stress distribution and optimum design factors under the Max. pressure were discussed through stress analysis of the valve plate of the hydraulic axial piston pump, which is one of the most important relative sliding regions.
대형차량용 HILS기반 능동형 공기현가 시스템의 제어로직 평가기술개발에 관한 연구
고영진(Youngjin Ko),백일현(Ilhyun Baek),박경민(Kyungmin Park),노윤식(Yunsik Ro),정환욱(Hwanwook Chung),김상우(Sangwoo Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
In this study, it was achieved vehicle test for pneumatic system and characteristic test for air spring to construct development environment based on HILS for Active Air Suspension System. SILS environment was developed through emulation and modeling of air spring for pressure & height sensors on the basis of test result. Purpose of this study is utilized virtual environment and vehicles model to develop a controller in laboratory, escaping in existing development environment that use real vehicle test. We will propose development environment of Active Electric Control Air Suspension System applying HILS system for improving the traditional method at a great expense. Also, we studied estimation technology for control algorithm development and verification.
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.
자동차용 유압베인펌프의 고속에서 베인과 캠링간의 이간현상
조인성(IhnSung Cho),백일현(IlHyun Baek),정재연(JaeYoun Jung) 한국트라이볼로지학회 2010 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.26 No.2
In an oil hydraulic vane pump for an automobile, it is very important that the vane doesn’t separate from the camring inner race during the operation of the vane pump. The vane generally has not only the oil hydraulic force acting on the bottom face to contact to camring inner race but there is also an 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 sufficient. However, the contact state between the vane tip and the camring inner race is only affected by the inertial and viscous forces during the delivery of the vane pump, because the oil hydraulic force acting on the vane is in equilibrium. If the inertial force is larger than the viscous force, which happens when the vane is separated from the camring inner race, the delivery of the vane pump can become unstable or the volume efficiency can become decrease rapidly. 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.
상용차용 열전소자 방식 무시동 냉난방시스템의 성능에 관한 연구
양동욱(Donguk Yang),백일현(Ilhyun Baek),박경민(Kyoungmin Park),노윤식(Younsik Ro),김무성(Moosung Kim),김상우(Sangwoo Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Independent air-conditioning and heating system for commercial vehicles is possible an cooling and heating environment by battery power without mechanical elements and has the important advantages which reduced fuel-price, minimized environmental pollution caused by emissions. In this study, the voltage and current of thermoelectric module, inside & outside temperature of cabin and internal & external temperature of cooling and heating system were measured after setting up anti-start air conditioning system using the thermoelectric element in the real operating condition. In experimental results, when it is measured and analyzed output voltage and current up to cutoff voltage, it is shown that the capacity of battery power is required approximately two times.
하벼리(Byoeri Ha),장병춘(Byoungchun Chang),백일현(Ilhyun Baek),노윤식(Yunsik Ro),박경훈(Gyounghoon Park),김성훈(Sunghoon Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Air brake system is a type of friction brake for vehicles in which compressed air pressing on a piston is used to apply the pressure to the brake pad needed to stop the vehicle. Air brakes are used in heavy duty vehicles and need high stiffness. Spring guide is device to set position of power spring in brake chamber. It has reliability problems by friction, wear damage and high load from power spring. In this paper, spring guide is designed to apply PA66 material and temporary product is made for design assessment. And shape optimization is performed using taguchi method and finite element analysis. As a result, SN ratio is calculated considering safety factor and weight lightening. Using taguchi method, predicted safety factor is similar to analysis result. Finally, designed optimum model is 28.3% lighter than temporary product and 66.6% lighter than existing steel product.
사축식 피스톤 펌프의 피스톤 링과 실린더 보어간의 윤활특성에 관한 연구
정재연(JaeYoun Jung),조인성(IhnSung Cho),백일현(IlHyun Baek),손소화(ShaoHua Sun),신현일(Hyunil Shin),송규근(KyuKeun song),오석형(SeokHyung Oh) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.6
The bent-axis type piston pump which is driven by the piston rod works on the way that the piston rod drives the cylinder block, so the taper angle of the piston rod and the swivel angle between the cylinder block and the shaft are very important design factors. If the above factors cannot satisfy the conditions of optimum design, the friction loss between the cylinder bore and the piston increases, and the pump can even fail to work under conditions of severe friction and wear. Since the piston reciprocates in the cylinder bore with high velocity, and at the same time it rotates on its own axis and revolves on the center of the cylinder block, the decrease of the volume efficiency generated on account of the leakage between the cylinder bore and the piston. Therefore, to prevent this case, the piston ring is designed at the end of the piston, and the friction characteristics between the piston ring and the cylinder bore are in need of research due to its great influence on the performance of piston pump. Thus, in this paper, the elastic hydraulic oil’s lubrication analyses of the film thickness, the pressure distribution, and the friction force, and so on, have been performed, and the lubrication characteristics between the piston ring and the cylinder bore are explored by the results of the numerical analysis, and it is contributed to realize the higher efficiency and the more advanced performance of the bent-axis type piston pump.
곽재련(Jaeryon Kwag),박경민(Kyungmin Park),백일현(Ilhyun Baek),조이행(Yeehaing Cho),정재연(Jaeyoun Jung) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Directional control valve is a main part of the hydraulic power steering system. It consists of a control spool, a housing and many hydraulic parts. The main roles of a directional control valve is link the working oil to the wanted direction . Flowed working oil through the directional control valve that operate the actuator to the specified direction so, it can makes steer the wheel&tire end of the drive shaft by using small force. Here, the structural characteristics and design parameters that directly affect to the dynamic behavior of the hydraulic system. The goal of this study was to understand the hydraulic fluid flow within directional control valve by using 3-D numerical method and wanted to know the pressure drop characteristics. To improve the convergence and robustness of the simulation model, a grid system was constructed with tetrahedron type grids all around the valve. Through this study we could know the CFD results relatively well matched with the experimental data.
유성기어-체인형 무단변속기의 동역학적 거동에 관한 연구
장병춘(Byoungchun Chang),고영진(Youngjin Ko),정윤식(Yunsik Jeong),백일현(Ilhyun Baek),노윤식(Yunsik Ro) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In the current automotive industry, due to high oil prices, new mechanism of automatic transmission has been studied in order to high fuel efficiency and improve power performance. Stage of AT(Automatic Transmission) is increasing continuously but its structure is more complex. So, CVT(Continuously Variable Transmission) which has infinite stages and freely shifting has emerged s the leading candidate. But, power transmission by friction between belt and pulley is the cause of power loss due to friction. In this paper, to overcome the disadvantage of AT and CVT, PGC(Planetary Gear-Chain) type CVT which delivered power without slip by engagement of the planetary gear and the chain has been studied. The analysis models were selected two types of PGC CVT, and the multi-body dynamics program ADAMS was used for analysis of dynamic behavior characteristics. As a result, B-type model rotated driving and driven part at the same time shows to wide shifting ratio and low average torque.