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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Automotive Engineers
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Journal DOI :
The Korean Society of Automotive Engineers
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Volume & Issues
Volume 16, Issue 6 - Nov 2008
Volume 16, Issue 5 - Sep 2008
Volume 16, Issue 4 - Jul 2008
Volume 16, Issue 3 - May 2008
Volume 16, Issue 2 - Mar 2008
Volume 16, Issue 1 - Feb 2008
Selecting the target year
Unsteady Flow Analysis of Oil Jet for Cooling the Piston
Kwon, Ji-Hyuk ; Lee, Yeon-Won ; Kim, Jae-Wan ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 1~7
In order to enhance the performance of an automotive engine, many researchers have been carried out. An oil jet cooling a piston is one of important parts for engine performance. Therefore, the efficient cooling system of an oil jet is needed. In this paper, unsteady flow analysis of the oil jet which consists of a check valve and a nozzle has been accomplished. And the reaction between mass flow rate and ball movement was also investigated.
Model Based Design and Validation of Control Systems using Real-time Operating System
Youn, Jea-Myoung ; Ma, Joo-Young ; SunWoo, Myoung-Ho ; Lee, Woo-Taik ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 8~17
This paper presents the Matlab/Simulink-based software-in-the-loop simulation(SILS) environment which is the co-simulator for temporal and functional simulations of control systems. The temporal behavior of a control system is strongly dependent on the implemented software and hardware such as the real-time operating system, the target CPU, and the communication protocol. The proposed SILS abstracts the system with tasks, task executions, real-time schedulers, and real-time networks close to the implementation. Methods to realize these components in graphical block representations are investigated with Matlab/Simulink, which is most commonly used tool for designing and simulating control algorithms in control engineering. In order to achieve a seamless development from SILS to rapid control prototyping (RCP), the SILS block-set is designed to support automatic code generation without tool changes and block modifications.
Noise Source Localization by Applying MUSIC with Wavelet Transformation
Cho, Tae-Hwan ; Ko, Byeong-Sik ; Lim, Jong-Myung ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 18~28
In inverse acoustic problem with nearfield sources, it is important to separate multiple acoustic sources and to measure the position of each target. This paper proposes a new algorithm by applying MUSIC(Multiple Signal Classification) to the outputs of discrete wavelet transformation with sub-band selection based on the entropy threshold, Some numerical experiments show that the proposed method can estimate the more precise positions than a conventional MUSIC algorithm under moderately correlated signal and relatively low signal-to-noise ratio case.
The Effect of Compress Residual Stress on Corrosion of the Shot Peened Spring Steel
Park, Sung-Mo ; Moon, Kwang-Seok ; Park, Keyong-Dong ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 35~42
The compressive residual stress due to shot peening process can increase the intrinsic fatigue strength of surface and therefore would be beneficial in reducing the probability of fatigue damage. However, it was not known that the effect of shot peening on corrosion environment. In this study, the influence of shot peening and corrosion condition on corrosion property was investigated on immersed in 3.5% NaCl, 10%
+3% HF, 6%
. The immersion test was performed with two kind of specimens. The immersion test periods were carried out on performed 360days. Corrosion potential and weight loss were investigated from experimental results. From these results, the effect of shot peening on the corrosion characteristics was evaluated.
A Study on Emission Charncteristics and EGR Application of Blending Fuels with Biodiesel Fuel and Oxygenate Component in a D.I. Diesel Engine
Choi, Seung-Hun ; Oh, Young-Taig ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 43~48
The exhaust emissions of diesel engine are recognized as a major cause influencing environment strongly. In this study, the possibility of biodiesel fuel and oxygenated fuel(dimethoxy methane; DMM) was investigated as an alternative fuel for a naturally aspirated direct injection diesel engine. The smoke emission of blending fuel(biodiesel fuel 90vol-%+DMM 10vol-%) was reduced approximately 70% at 2500rpm, full load, in comparison with the diesel fuel. But, power, torque and brake specific energy consumption showed no significant differences. But, NOx emission of biodiesel fuel and DMM blended fuel increased compared with commercial diesel fuel due to the oxygen component in the fuel. It was needed a NOx reduction counterplan that EGR method was used as a countermeasure for NOx reduction. It was found that simultaneous reduction of smoke and NOx emission was achieved with BDF(95 vol-%) and DMM(5 vol-%) blended fuel and cooled EGR method(15%).
A Study on the Injury Criteria of the Occupant Protection Performance of Crush Cushions
Lim, Jae-Moon ; Jung, Geun-Seup ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 49~57
The performance of crash cushion systems is certified through the full scale crash tests by the standard for installation and maintenance guidelines for roadside safety appurtenance. The impact severities of impacting vehicles in collision with crash cushion systems are rated by indices THIV and PHD. Crash test results are considered to study the performance of three crash cushion systems. In case of the frontal impact or the offset frontal impact, the results show that THIV values of three systems are very close to the threshold limit for the occupant protection. Also, the results show that PHD would be improper for the occupant protection performance index. In order to improve the occupant protection performance of crash cushions, ASI needs to be included in the impact severity index.
Development of Multi-body Data Conversion Program for Torque Converter Analysis
Lee, Jae-Chul ; Chun, Doo-Man ; Ahn, Sung-Hoon ; Yeo, Jun-Cheol ; Jang, Jae-Duk ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 58~65
The finite element programs have been developed for structure, collision, flow, dynamics, heat transfer, acoustics, electromagnetism, MEMS (Micro Electro Mechanical Systems), and etc. These programs can be classified as either "package" program or "single purpose" program. Single purpose programs usually have convenient and powerful functions, but these programs have limited expandability to different fields of analysis. Therefore, the method to converter the analysis results of single purpose program to other programs is needed. In the research, multi-body data conversion methods of 1) finite element model and 2) solid model were created to convert fluid analysis result of CFD-ACE+ to ANSYS data structure. Automatic boundary condition algorithms were developed for blade, and finite element model was compared with solid model. It is expected that, by sealess data transfer, the Multi-body Data Conversion Program could reduce the development period of torque converters.
Comer Detection of Parking Lot Using Multiple Echo Ultrasonic
Kim, Byung-Sung ; Park, Wan-Joo ; Seo, Dong-Eun ; Lee, Kwae-Hi ; Kim, Dong-Suk ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 66~73
In this paper, ultrasonic range system which detects parking lot in parking area is studied. The important part for detecting parking lot accurately is to detect the first and second corners of possible parking lot, and for that, new method using multiple echo function is introduced in this paper. Many probabilistic methods have been used to reduce uncertainties of ultrasonic sensor for distance and location of objects. Method using multiple echo, however, gives accurates results as well as simple algorithm. For experiments in parking space, ultrasonic range system was attached to a Pioneer AT-2 and final parking space map was created in a fusion with position information from wheels of a Pioneer AT-2. We will show the results are compared with error of another methods.
Strength Analysis of Cross Groove Type Constant Velocity Joint Cage for Propeller Shaft
Oh, Byung-Ki ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 74~79
The fracture strength of cross groove type constant velocity joint is largely determined by the fracture strength of the cage having window-like pockets for retaining the torque transmitting balls. A stress distribution acting on the cage is influenced by rigidities of the rim portion and of the column members, therefore requires a calculation such as FEA. To analyze fracture strength of cage, a 3-D elasto-plastic finite element analysis and a submodeling technique are used to achieve both computational efficiency and accuracy. The results are in reasonably good agreement with experiment.
Uncontrolled Regeneration Characteristics of SiC DPFs using DPF Test Rig
Oh, Kwang-Chul ; Lee, Chun-Hwan ; Cho, Taik-Dong ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 80~86
Uncontrolled regeneration characteristics of two different type SiC DPFs(diesel particulate filters) were investigated by DPF test rig devised to facilitate DPF evaluation, especially for regeneration and MSL(maximum soot loading) test similar to engine dynamometer test. In order to estimate the limits of maximum filter temperature and temperature gradient causing filter fracture, such as crack or whitening, the temperature distributions inside the filter were measured by thermocouples. The maximum filter temperature was observed near the rear plane of central filter region due to heat accumulation by exothermic reaction of PM but the maximum temperature gradient occurred at the boundary of high filter temperature. These two parameters induced the different SiC DPFs to fracture with different modes, whitening and crack.
The Effect of Cross-flow on Liquid Atomization
Kim, Jong-Hyun ; Cho, Woo-Jin ; Lee, In-Chul ; Lee, Bong-Soo ; Koo, Ja-Ye ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 87~92
The breakup processes and spray plume characteristics of liquid jets injected in subsonic air cross-flows were experimentally studied. The behaviors of column, penetration, breakup of plain liquid jet and droplet sizes, velocities have been studied in non-swirling cross-flow of air. Nozzle has a 1.0 mm diameter and Lid ratio=5. Experimental results indicate that the breakup point is delayed by increasing air momentum, the penetration decreases by increasing Weber number and the split angle is increased by increasing air velocity or decreasing injection velocity. SMD increases according as increasing height or decreases in accordance with increasing air velocity. This phenomenon is related to the momentum exchange between column waves and cross-flow stream. Droplet vector velocities were varied from 11.5 to 33 m/s. A higher-velocity region can be identified in down edge region at Z/d=40, 70 and 100. Lower-velocity region were observed on bottom position of the spray plume.
Investigation on the Liquid Water Droplet Instability in a Simulated Flow Channel of PEMFC
Kim, Bo-Kyung ; Kim, Han-Sang ; Min, Kyung-Doug ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 93~98
To investigate the characteristics of water droplet on the gas diffusion layer from both top-view and side-view of the flow channel, a rig test apparatus was designed and fabricated with prism attached plate. This experimental device is used to simulate the growth of single liquid water droplet and its transport process with various air flow velocity and channel height. The contact angle hysteresis and height of water droplet are measured and analyzed. It is found that droplet tends towards to be instable by decreasing channel height, increasing flow velocity or making GDL more hydrophobic. Also, the simplified force balance model matches with experimental data only in a restricted range of operating conditions and shows discrepancy as the air flow velocity and channel height increases.
Hysteretic Characteristics of Leaf Springs in Commercial Vehicles
Moon, Won-Ki ; Song, Chul-Ki ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 99~105
Multi-leaf springs are widely used for a major suspension component in many commercial vehicles. The modeling technique of multi-leaf springs is one of the most difficult problems in suspension modeling as the elements have complicated nonlinear characteristics such as a hysteresis behavior due to the friction. In this paper, hysteretic characteristics with the static and dynamic test are modeled and are simulated with three links and joints in MSC.ADAMS. Simulation results showed good agreements with test results. Using this methodology, it is expected that dynamic characteristics of suspension system with multi-leaf spring can be more accurately evaluated in vehicle dynamics.
Crash FE Analysis of Front Side Assembly of Passenger Cars for Management of Collapse Shape Via Variation of Thickness with Reverse Engineering
Kim, Yong-Woo ; Kim, Jeong-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 106~113
The goal of crashworthiness is an optimized vehicle structure that can absorb the crash energy by controlled vehicle deformations while maintaining adequate space so that the residual crash energy can be managed by the restraint systems to minimize crash loads transfer to the vehicle occupants. Front side assembly is one of the most important energy absorbing components in relating to the crashworthiness design of vehicle. The structure and shape of the front side assemblies are different depending on auto-makers and size of vehicles. Thus, it is not easy to grab an insight on designer's intention when you glance at a new front side member without experiences. In this paper, we have performed the explicit nonlinear dynamic finite element analysis on the front side assembly of a passenger car to investigate the effect of thickness distribution of the front side assembly on the collapse shape, which is important in the aspect of controlling deformation to maintain adequate space, from the viewpoint of reverse engineering. To do this, we have performed crash FE analysis for the assembly by varying the thickness distribution of the assembly.
Analysis of Buckling Characteristics for Hat Section Member Using Structural Foam and Plastic Reinforcement
Lee, Tae-Hyun ; Shin, Shoung-Gi ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 114~119
The modern automotive industry develops innovative vehicle designs to meet increasing stability of car and performance demands of their customers. The improvement of frame rigidity by the structural foam is thought to be an effective means to improve the performance because of high applicability and minimum weight. The object of this paper is to examine the use of structural foam in a hat section as an optimum reinforcing means, to compare the reinforcing performance of structural foam versus a plastic reinforcement. The result of this paper indicated that reinforcing efficiencies are achieved by structural foam and plastic reinforcement shape.
Analytic Study on the Axial Forces of a Double Offset Constant Velocity Joints in Consideration of Friction Effect
Bae, Byoung-Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 120~127
The constant velocity joint(CVJ) used for transmitting torque to the front wheels is an important part in automotive drive system. There are several types of constant velocity joints. Typically, they are classified by fixed and plunging constant velocity joints. The axial force generated in plunging constant velocity joints influences significantly the noise, vibration and harshness. For heaps of time, many constant velocity joint markers have been studying and developing a valid method to reduce the axial force and extensive tests have been carried out on rigs. This paper presents the analysis method to predict the axial force of a double offset constant velocity joint(DOJ), a kind of plunging constant velocity joint, and the influence of ball-cage dimension tolerance on the axial force.
Study on Fuel Consumption Improvement in SI Engine with EGR for Hybrid Electric Vehicle
Park, Cheol-Woong ; Choi, Young ; Kim, Chang-Gi ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 128~135
EGR(exhaust gas recirculation) is considered as a most effective method to reduce the NOx emissions. But high EGR tolerance is always pursued not only for its advantages of the pumping loss reduction and fuel economy benefit in Gasoline-Hybrid engine. However, the occurrence of excessive cyclic variation with high EGR normally prevents substantial fuel economy improvements from being achieved in practice. Therefore, the optimum EGR rate should be carefully determined in order to achieve low fuel consumption and low exhaust emission. In this study, 2 liters gasoline engine with E-EGR system was used to investigate the effects of EGR on fuel efficiency, combustion stability, engine performance and exhaust emissions. With optimal EGR rates, the fuel consumption was improved by 4%. This improvement was achieved while a reduction in NOx emissions of 75% was accomplished. Increase of EGR gas temperature causes the charge air temperature to affect the knock phenomenon and moreover, the EGR valve lift changes for the same control signal.
A Study of the Improvement of Thermal Performance of a Junction Box of a Passenger Car
Lee, Young-Lim ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 136~142
Thermal management of a junction box of a passenger car has recently become more challenging due to its smaller size and larger current capacity. Thus, it is essential to perform the thermal optimization of a junction box in its design on an early stage of vehicle design. In this study, 3 dimensional CFD simulation with experimental measurement has been done to study for better thermal management of the junction box. First, the study of thermal characteristics of electric relays in the junction box has revealed that each surface of the relay has very different thermal resistance. In addition, an idea to install a cooling fan on the junction box has been studied and it was found that the forced cooling method was not effective on the system to keep the thermal resistance to the reasonable level of the junction box. Finally, the effect of external flows around the junction box on the temperatures of the relays, fuses, etc. has been studied and the result shows that the installation of the junction box at the proper place in an engine room can avoid any unnecessary overdesign in thermal management.
Numerical Studies on Combustion Characteristics of Diesel Engines using DME Fuel
Yu, Yong-Wook ; Lee, Jeong-Won ; Kim, Yong-Mo ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 143~149
The present study is mainly motivated to investigate the vaporization, auto-ignition and spray combustion processes in DI diesel engine using DME and n-heptane. In order to realistically simulate the dimethyl ether (DME) spray dynamics and vaporization characteristics in high-pressure and high-temperature environment, the high-pressure vaporization model has been utilized. The interaction between chemistry and turbulence is treated by employing the Representative Interaction Flamelet (RIF) model. The detailed chemistry of 336 elementary steps and 78 chemical species is used for the DME/air reaction. Based on numerical results, the detailed discussion has been made for the distinctly different combustion characteristics of DME diesel engine in term of vaporization, ignition delay, pollutant formation, and heat release rate.
Studies on the Performance Characteristics of an Electronically Controlled
Air Conditioning System for Fuel Cell Electric Vehicles
Kim, Sung-Chul ; Lee, Dong-Hyuk ; Lee, Ho-Seong ; Won, Jong-Phil ; Lee, Dae-Woong ; Lee, Won-Suk ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 150~157
The main objective of this paper is to investigate the performance characteristics of a
air conditioning system for fuel cell electric vehicles (FCEV). The present air conditioning system for FCEV uses the electrically driven compressor and electrically controlled expansion valve for
as a working fluid. The experimental work has been done with various operating conditions, which are quite matching the actual vehicle's driving conditions such as different compressor speed and high pressure to identify the characteristics of the system. Experimental results show that the cooling capacity and coefficient of performance (COP) were up to 6.3kW and 2.5, respectively. This paper also deals with the development of optimum high pressure control algorithm for the transcritical
cycle to achieve the maximum COP.
LPG-DME Compression Ignition Engine with Intake Variable Valve Timing
Yeom, Ki-Tae ; Bae, Choong-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 158~165
The combustion and exhaust emissions characteristics of a liquefied petroleum gas-di-methyl ether compression ignition engine with a variable valve timing device were investigated under various liquefied petroleum gas injection timing conditions. Liquefied petroleum gas was used as the main fuel and was injected directly into the combustion chamber. Di-methyl ether was used as an ignition promoter and was injected into the intake port. Different liquefied petroleum gas injection timings were tested to verify the effects of the mixture homogeneity on the combustion and exhaust emission characteristics of the liquefied petroleum gas-di-methyl ether compression ignition engine. The average charge temperature was calculated to analyze the emission formation. The ringing intensity was used for analysis of knock characteristics. The combustion and exhaust emission characteristics differed significantly depending on the liquefied petroleum gas injection and intake valve open timings. The CO emission increased as the intake valve open and liquefied petroleum gas injection timings were retarded. However, the particulate matter emission decreased and the nitrogen oxide emission increased as the intake valve open timing was retarded in the diffusion combustion regime. Finally, the combustion efficiency decreased as the intake valve open and liquefied petroleum gas injection timings were retarded.
Numerical Study on Impingement Process and Fuel Film Formation of GDI Spray according to Wall Geometry under High Ambient Temperature
Shim, Young-Sam ; Choi, Gyung-Min ; Kim, Duck-Jool ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 166~174
Numerical study on the impingement process and the fuel film formation of the hollow-cone fuel spray was conducted under vaporization condition, and the effect of the wall cavity angle on spray-wall impingement structure was investigated. A detailed understanding of this phenomena will help in designing injection systems and controlling the strategies to improve engine performance and exhaust emissions of the Gasoline Direct Injection (GDI) engine. The improved Abramzon model was used to model the spray vaporization process and the Gosman model was adopted for modeling of spray-wall impingement process. The calculated results of the spray-wall impingement process were compared with experimental results. The velocity field of the ambient gas, the Sauter Mean Diameter (SMD) and the generated fuel film on the wall, which are difficult to obtain by the experimental method, were also calculated and discussed. It was found that the radial distance after the wall impingement and the SMD decreased with increasing the cavity angle and the temperature.
Performance and Emissions of a SI Engine Operated with LPG-DME Blended Fuel
Lee, Seok-Hwan ; Oh, Seung-Mook ; Kang, Kern-Yong ; Choi, Won-Hak ; Cha, Kyoung-Ok ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 175~182
In this study, a spark ignition engine operated with LPG and DME blended fuel was studied experimentally. Performance and emissions characteristics of a LPG engine fuelled by LPG and DME blended fuel were examined. Results showed that stable engine operation was possible for a wide range of engine loads within 20% mass content of DME fuel. Also, engine output power within 10% mass content of DME fuel was comparable to pure LPG fuel operation. Exhaust emissions measurements showed that hydrocarbon and NOx were increased with the blended fuel at low engine speed. Engine output power was decreased and break specific fuel consumption (BSFC) was severely increased with the blended fuel since the energy content of DME was much lower than that of LPG. Considering the results of engine output power and exhaust emissions, the blended fuel within 20% mass content of DME could be used as an alternative fuel for LPG.
A Study on the Characteristics of Idle Vibration due to the Type of Constant Velocity Joints
Sa, Jong-Sung ; Shin, Yang-Hyun ; Kang, Tae-Won ; Kim, Chan-Mook ;
Transactions of the Korean Society of Automotive Engineers, volume 16, issue 2, 2008, Pages 183~190
This paper deals with the characteristics of idle vibration due to the type of constant velocity joints. Based on the kinematics model of constant velocity joints, a offset between the tripod center and tullip center plays a important role in generating unwelcome forces. Moreover, it induced additional forces in lateral direction of a vehicle movement according to the angle of the spider in idle vibration. The difference of mass for each constant velocity joint types affect the natural frequency of the driveshaft and the powertrain. When the static torque is applied to the constant velocity joints, the natural frequencies of the driveshaft are reduced nearby 50Hz. There will be a big opportunity that the dirveshaft and constant velocity joints would be a transfer path of idle vibration at D or R gear range. Experiments indicate that TJ type is better than SFJ and DOJ in idle vibration.