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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Transactions of the Korean Society of Automotive Engineers
Journal Basic Information
Journal DOI :
The Korean Society of Automotive Engineers
Editor in Chief :
Volume & Issues
Volume 18, Issue 6 - Nov 2010
Volume 18, Issue 5 - Sep 2010
Volume 18, Issue 4 - Jul 2010
Volume 18, Issue 3 - May 2010
Volume 18, Issue 2 - Mar 2010
Volume 18, Issue 1 - Jan 2010
Selecting the target year
An Investigation of a Stratified Charge Mixture's HCCI Combustion Processes Using a Rapid Compression Machine
Lim, Ock-Taeck ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 1~8
The introduction of mixture heterogeneity has been considered to be one of the ways to avoid knocking, as it reduces the pressure rise rate in HCCI Combustion. The purpose of this research was to investigate the effects of heterogeneity, in particular thermal stratification and fuel strength stratification, on HCCI Combustion fueled with DME and n-Butane. Thermal stratification is formed in the Combustion Chamber of a Rapid Compression Machine with three kinds of pre-mixture, each with different properties. The stratified charge mixture was adiabatically compressed, throughout which cylinder gas pressure and two-dimensional chemiluminescence images were measured and analyzed.
Concept Car Development using Personal Digital Design Process based on Engineering Technology
Maeng, Joo-Won ; Cho, Chong-Du ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 9~19
Every car manufacturer desires to reduce the new car development time spent in improving the safety, NVH, lightweight, reliability and environment friendly features of the car. Other considerations such as planning, exterior and interior styling, packaging, color, and material selection increase the complexity of the car design process. This paper proposes a personal DDP (Digital Design Process) to utilize the engineering analysis and design/styling software for car design. DDP can be efficiently used by a team of car research center or a studio with small number of engineers, helping ordinary engineers becoming ambidextrous in design as well as engineering applications. The concept model starts from idea sketch, rendering, and 3D surface model with CAS (Computer Aided Styling) to the final safety estimation by using proposed DDP based on engineering technology (CAD, CAE). The concept model proposed a hydrogen fuel cell sports coupe which could be available within next 10 years. The proposed DDP can not only reduce the new car development time but also be adapted into designing of varied products such as aircraft, yacht, electrical equipment and sports gear.
A Study on Influence of the Head Restraint Position on Neck Injury in Rear End Collision
Choi, Dong-Won ; Chun, Young-Bum ; Park, In-Song ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 20~24
The position of the automobile's head restraint is very important for the neck injury in rear end collision. This study is about influence of the head restraint height and distance on neck injury during rear end collision. The effects of the position have been evaluated experimentally. The neck injuries are calculated by the relative acceleration between the upper and lower neck. As a result, It is found that the head restraint should be close enough to the back of the head and high enough to the top of the head.
A Study on the Corrosion Resistance of Hot Stamped Automotive Parts
Yoo, Ji-Hong ; Nam, Seung-Man ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 25~30
The authors have studied on the corrosion resistance of the hot stamped steel sheets for the application to automotive parts. Recently automotive companies have focused on the hot stamped parts to meet the light weighting needs and the safe reason. Because of the cost reduction of the hot stamped parts, automotive companies increase the usage of the coated steel sheets, especially Al-Si coated steel sheets. The coated layer of Al-Si coated steel sheets contains up to 50% of Fe, which was diffused from the steel sheet, after hot stamping. The hot stamped steel sheet was not phosphated due to the oxidation layer of the coating, however, the result of the water resistance test is similar to that of the conventional GA steel sheets. The pitting depth and the weight reduction of the coated layer of hot stamped steel sheets are less than those of GA steel.
CFD Analysis on the Fresh Air Distribution in the Catalytic Converter Varying Secondary Air Injector Position
Yun, Jeong-Eui ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 31~36
SAI(Secondary Air Injection) system has been studied widely as one of the promising countermeasure for reducing HC emission at cold start. In this paper, in order to find out the optimal position of SAI, computational thermal fluid analysis on exhaust system adapted SAI system is performed using commercial 3-D CFD code, CFX. The present results showed that SAI position strongly affected the uniformity of air distribution in front of catalyst. And also through the decision process of optimal position of SAI, new index, uniformity of air distribution(
) is proposed to define it quantitively. Because
is very simple equation and similar with flow uniformity, it is very easy to figure out the physical meaning and to apply it to practices. Finally, we applied the index
to the decision process of the optimal position of SAI, so that we could get the clear comparison results.
Estimation of Subjective Evaluations for Impact Sound and Analysis of the Effects for Parts of a Car
Park, Sang-Won ; Lee, Sang-Kwon ; Bae, Byung-Kuk ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 37~44
Impact noise is induced in a car when it is driven on a harsh road or over some bumps. This noise occurs with the very high level of sound, which affects passengers in some way or other. Although it is impossible to clearly remove such noise, it is necessary to research an improvement in sound quality for impact noise. A new sound metric for impact sound is presented. This metric is verified by comparison between mean subjective ratings and several sound metrics. In this paper, more objective attributes are considered, which the attributes are expressing the level and modulation of sound. Three sound metrics are employed to get impact sound indexes for each course by the method of multiple linear regressions. The indexes are verified by considering the correlation between the estimated values from the multiple linear regressions and the mean subjective ratings by evaluators. Also, the subjective ratings on the indexes are estimated for the case in which some parts of suspension system are changed. The estimated ratings represent more reasonable or acceptable ratings. Thus, such indexes can be used for modification of the parts of suspension system under considering a good sound quality.
Hydro-forming Process Development of Automotive AA6061 Rear Sub-frame Side Member by Computer Aided Engineering (CAE)
Kim, Kee-Joo ; Kim, Jae-Hyun ; Choi, Byung-Ik ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 45~49
The automotive industry has shown a growing interest in tube hydroforming during the past years. The advantages of hydroforming (less thinning, a more efficient manufacturing process, etc.) can, for instance, be combined with the high strength of extra high strength steels, which are usually less formable, to produce structural automotive components which exhibit lower weight and improved service performance. Design and production of tubular components require knowledge about tube material and forming behavior during hydroforming and how the hydroforming operation itself should be controlled. These issues are studied analytically in the present paper. In this study, the whole process of rear sub-frame parts development by tube hydroforming using AA6061 material is presented. At the part design stage, it requires feasibility study and process design aided by CAE (Computer Aided Engineering) to confirm hydroformability in details. Effects of parameters such as internal pressure, axial feeding and geometry shape in automotive rear sub-frame by hydroforming process were carefully investigated. Overall possibility of hydroformable rear sub-frame parts could be examined by cross sectional analyses. Moreover, it is essential to ensure the formability of tube material on every forming step such as pre-bending and hydroforming. In addition, all the components of prototyping tool are designed and interference with press is examined from the point of geometry and thinning.
A Study on the Vibratory Characteristics of the Stack in Fuel Cell Vehicle at Driving Condition
Ju, Hyung-Jun ; Kim, Gi-Hoon ; Park, Jae-Yong ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 50~55
In recent years, the development of fuel cell vehicles has further accelerated because of environmental problem and petroleum resources shortage. The fuel cell vehicles have the stack which converts fuel to electricity. The stack is usually mounted by bush to isolate the vibration of chassis and body. This paper analyzed the vibratory characteristics of stack and chassis, body system. The wheel forces of fuel cell vehicle are measured to estimate the road load data. And the paths of vibration from wheel to stack are analyzed by CAE. According to the test and CAE results, the improvement of stack vibration are evaluated.
Verification and Validation of Dynamic Clearance in Digital Mockup Using Engine Movement Roll Data
Kim, Yong-Suk ; Jang, Dong-Young ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 56~61
This paper presents dynamic clearance verification considering engine movement for vehicle engine room package and validates through physical vehicle test. Traditionally, static clearance guide has been used for engine room package, but it's only 2-dimension criteria that results in requiring unnecessary space and it's not possible to conduct engine movement with real driving conditions. Thus, the dynamic DMU considers engine movement based on 28 load cases that are Roll Data analyzed by CAE for maximum engine movement and visualizes part-to-part dynamic clearance into virtual space. The dynamic DMU enables to develop compact engine room package without unnecessary space. The result of comparison between simulation and physical test has 0.892 correlation coefficient.
Simulation-based Intake Manifold Runner Length Optimization for Improving Performance, Fuel Consumption and Emission of a Gasoline Engine
Kang, Yong-Hun ; Choi, Dong-Hoon ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 62~67
Exhausting fossil fuel and increasing concern of air pollution have brought on the change of the focus of developing new vehicles from performance to fuel economy and emission. The gasoline engines adopting the naturally aspirated way use the throttle-body for engine load control. Therefore, its pumping loss increases more than that of the diesel engine, and also mostly operating in a partial load condition has bad influence on fuel economy and emission. In these days, the continuous variable valve timing system and variable induction system are adopted in order to improve fuel consumption and emission. In this study, we optimize the runner length and operate region of variable induction system to simulataneously improve the performance, fuel economy, and emission of gasoline engine with employing GT-Power as a CAE tool for engine analysis and PIAnO as PIDO tool for process integration and design optimization.
Assembly Analysis for Evaluation of Sealing in PEMFC Stack
Kim, Dae-Young ; Kim, Jung-Min ; Kim, Heon-Young ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 68~75
The one of the major problems in the development of PEMFC was regarding to the assurance of sealing on stack. The failure on the sealing creates the problems of fuel leakage, mixing, internal combustion, damage on parts and can be a direct reason for the degrading the efficiency of fuel cell. This paper studies on the analytical approach for improving the contacting pressure distribution on the gasket at the evaluation on the sealing of fuel cell stack. So, the assembly analysis on multi layered fuel cell stack was performed. The research on the simplification of finite element model was performed for three dimensional analysis at the multi layered state. The improved contact pressure distribution was obtained through the case studies on gasket for better sealing. In addition, the number of the cell was determined for the effective analysis and the structural characteristics were evaluated based on this research.
A Study on the Spray and Combustion Characteristics of Diesel-ethanol-biodiesel Blended Fuels in a Diesel Engine
Park, Su-Han ; Youn, In-Mo ; Lee, Chang-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 76~84
The aim of this study is to analyze the effect of the ethanol blending in diesel-ethanol blended fuels on the spray and combustion characteristics in a common-rail four-cylinder diesel engine. For the analysis of the spray characteristics, the spray images were obtained using a high speed camera with metal-halide lamps. From these spray images, the macroscopic spray characteristics such as the spray tip penetration and spray cone angle were investigated. Also, the combustion characteristics including the combustion pressure and the rate of heat release were studied with the analysis of the exhaust emissions in diesel-ethanol blended fuel driven diesel engine. It can be confirmed from the experiment on spray characteristics of diesel-ethanol blended fuels that the increased ethanol blending ratio induced the decrease of the spray tip penetration after the end of the injection. The spray cone angle slightly increased by the blending of ethanol fuel. In the experiment on atomization characteristics, the ethanol blending caused the improvement of the diesel atomization performance. On the other hand, at the same engine load condition, the increase of the ethanol blending ratio lead to lengthen the ignition delays, and to decrease the peak combustion pressure and the rate of heat release. Totally, the combustion and emission characteristics of ULSD and DE10 showed similar characteristics. However, in the case of DE20, CO and HC rapidly increased, and
decreased. It can be believed that 20% ethanol disturbed the combustion of diesel-ethanol blended fuel due to the low cetane number and evaporation.
An Experimental Study on
Reduction Efficiency and
Conversion Efficiency under Various Conditions of Reductant Injection on SCR and AOC
Dong, Yoon-Hee ; Choi, Jung-Hwang ; Cho, Yong-Seok ; Lee, Seang-Wock ; Lee, Seong-Ho ; Oh, Sang-Ki ; Park, Hyun-Dae ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 85~90
As the environmental regulation of vehicle emission is strengthened, investigations for
and PM reduction strategies are popularly conducted. Two current available technologies for continuous
reduction onboard diesel vehicles are Selective Catalytic Reduction (SCR) using aqueous urea and lean
trap (LNT) catalysts. The experiments were conducted to investigate the
reduction performance of SCR system which can control the ratio of
, temperature and SV(space velocity), and the model gas was used which is similar to a diesel exhaust gas. The maximum reduction efficiency is indicated when the
ratio is 1:1 and the SV is 30,000
. Generally, ammonia slip from SCR reactors are rooted to incomplete conversion of
over the SCR. In this research, slip was occurred in 6cases (except low SV and
ratio is 1:1) after SCR. Among 6 case of slip occurrence, the maximum conversion efficiency is observed when SV is 60,000
A Experimental Study on the Measurement and Estimation of Vehicle Center of Gravity
Lee, Myung-Su ; Kim, Sang-Sup ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 91~99
The center of gravity on vehicle is a fundamentally important point for assessing and measuring the characteristics of vehicle dynamics. Especially, the center of gravity height on vehicles is the closest factor with respect to rollover accidents in a social issue nowadays. In this paper, the center of gravity height in conjunction with vehicle parameters of vehicle weight, driving axle and roof height after measured by vehicle weight and loading location by means of VCGM developed by KATRI with good performance that the accuracy was less than 0.6% and repeatability 0.3% for vehicles being used in the whole world was observed. As a result of study, the location of center of gravity height on vehicle was able to be estimated with only roof height on vehicle.
Influence of Rotating Wheel and Moving Ground Condition to Aerodynamic Performance of 3-Dimensional Automobile Configuration
Kang, Seung-On ; Jun, Sang-Ook ; Park, Hoon-Il ; Ku, Yo-Cheon ; Kee, Jung-Do ; Hong, Dong-Hee ; Kim, Kyu-Hong ; Lee, Dong-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 100~107
This paper gives new conceptual descriptions of drag reduction mechanism owing to rotating wheel and moving ground condition when dealing with automotive aerodynamics. Using Computational Fluid Dynamics (CFD), flow simulation of three dimensional automobile configuration made by Vehicle Modeling Function (VMF) is performed and the influence of wheel arch, wheels, rotating wheel & moving ground condition to the automotive aerodynamic performance is analyzed. Finally, it is shown that rotating wheel & moving ground condition decreases automotive aerodynamic drag owing to the reduction of the induced drag led by the decrease of COANDA flow intensity of the rear trunk flow.
A Study on Relation of Needle-Nozzle Flow of Piezo-driven Injector by using Eulerian-Lagrangian Multi-phase Method
Lee, Jin-Wook ; Min, Kyoung-Doug ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 108~114
The injection nozzle of an electro-hydraulic injector is being opened and closed by movement of a injector's needle which is balanced by pressure at the nozzle seat and at the needle control chamber, at the opposite end of the needle. In this study, the effects of needle movement in a piezo-driven injector on unsteady cavitating flows behavior inside nozzle were investigated by cavitation numerical model based on the Eulerian-Lagrangian approach. Aimed at simulating the 3-D two-phase flow behavior, the three dimensional geometry model along the central cross-section regarding of one injection hole with real design data of a piezo-driven diesel injector has been used to simulate the cavitating flows for injection time by at fully transient simulation with cavitation model. The cavitation model incorporates many of the fundamental physical processes assumed to take place in cavitating flows. The simulations performed were both fully transient and 'pseudo' steady state, even if under steady state boundary conditions. As this research results, we found that it could analyze the effect the pressure drop to the sudden acceleration of fuel, which is due to the fastest response of needle, on the degree of cavitation existed in piezo-driven injector nozzle.
Numerical Analysis on the Initial Cool-down Performance Inside an Automobile for the Evaluation of Passenger's Thermal Comfort
Kim, Yoon-Kee ; Yang, Jang-Sik ; Baek, Je-Hyun ; Kim, Kyung-Chun ; Ji, Ho-Seong ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 115~123
Cool-down performance after soaking is important because it affects passenger's thermal comfort. The cooling capacity of HVAC system determines initial cool down performance in most cases, the performance is also affected by location, and shape of panel vent, indoor seat arrangement. Therefore, optimal indoor designs are required in developing a new car. In this paper, initial cool down performance is predicted by CFD(computational fluid dynamics) analysis. Experimental time-averaging temperature data are used as inlet boundary condition. For more reliable analysis, real vehicle model and human FE model are used in grid generation procedure. Thermal and aerodynamic characteristics on re-circulation cool vent mode are investigated using CFX 12.0. Thermal comfort represented by PMV(predicted mean vote) is evaluated using acquired numerical data. Temperature and velocity fields show that flow in passenger's compartment after soaking is considerably unstable at the view point of thermodynamics. Volume-averaged temperature is decreased exponentially during overall cool down process. However, temperature monitored at different 16 spots in CFX-Solver shows local variation in head, chest, knee, foot. The cooling speed at the head and chest nearby panel vent are relatively faster than at the knee and foot. Horizontal temperature contour shows asymmetric distribution because of the location of exhaust vent. By evaluating the passenger's thermal comfort, slowest cooling region is found at the driver's seat.
Analysis of Performance Characteristics on Diesel Engine with Aftertreatment and EGR System
Park, Cheol-Woong ; Choi, Young ; Lim, Gi-Hun ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 124~129
The direct injection (DI) diesel engine has become a prime candidate for future transportation needs because of its high thermal efficiency. However, nitrogen oxides (NOx) increase in the local high temperature regions and particulate matter (PM) increases in the diffusion flame region within diesel combustion. Therefore, the demand for developing hybrid system consist of exhaust gas recirculation (EGR) and aftertreatment system as well as diesel particulate filter (DPF) or lean NOx trap (LNT) should be applied. The variation of EGR rate due to the malfunction of EGR valve can affect not only the combustion stability of engine but also the performance of aftertreatment system. In this research, 2.0 liter 4-cylinder turbocharged diesel engine was used to investigate the combustion and emission characteristics for various operating conditions with EGR. While the fuel consumption was increased with increase of EGR rate, NOx emission was improved by maximum 90% at low speed, low load operating condition. To achieve combustion stability and reliability of aftertrearment system with minimum penalty in fuel consumption and emissions, the fault diagnosis of EGR malfunction must be employed.
A Study on Suitable the Amount of Consumption of 2K Urethane Paint
You, Chang-Bae ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 130~135
Paint is used as top coat in Automobile Refinishing that is divided into 1K paint of base type and 2K paint of urethane type. after using 1K paint, it can be reusable. However 2K paint is not available that is mixed a certain amount of base with hardner, so 2K paint has to be used all at a time or discarded the rest. This study covered that colored Urethane paint and colorless urethane paint in top coating process of AR. Top coat urethane paint is divided into colored urethane paint and transparent urethane paint like clear coat. Colored urethane paint is used for paint that contains resin, pigment, solvent and additives. It is color such as black and white. While transparent urethane paint is used for paint that contains resin, solvent and additives. Urethane paint has a paint system that cur after several hours of mixing base and hardner. By a paint technician of a field and empirical data, we can also recognize that according to worker's paint style and experience, although he or she paint same car model and area, paint use of one's is different. There aren't guidelines workers refer to about paint use by car models and work scope because ARP works various car models that are in different color, size and area. After using urethane paint, the rest of paint has come, and there are highs and lows in paint use each time he or she works. Therefore, this study suggest a basic guideline to use paint efficiently and regularly by understanding area, the type of work, and paint use that are appropriate for each car model and regardless of workers and work scopes in AR.
Optimization of Diesel Engine Performance with Dual Loop EGR considering Boost Pressure, Back Pressure, Start of Injection and Injection Mass
Park, Jung-Soo ; Lee, Kyo-Seung ; Song, Soon-Ho ; Chun, Kwang-Min ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 5, 2010, Pages 136~144
Exhaust gas recirculation (EGR) is an emission control technology allowing significant NOx emission reduction from light-and heavy duty diesel engines. The future EGR type, dual loop EGR, combining features of high pressure loop EGR and low pressure loop EGR, was developed and optimized by using a commercial engine simulation program, GT-POWER. Some variables were selected to control dual loop EGR system such as VGT (Variable Geometry Turbocharger)performance, especially turbo speed, flap valve opening diameter at the exhaust tail pipe, and EGR valve opening diameter. Applying the dual loop EGR system in the light-duty diesel engine might cause some problems, such as decrease of engine performance and increase of brake specific fuel consumption (BSFC). So proper EGR rate (or mass flow) control would be needed because there are trade-offs of two types of the EGR (HPL and LPL) features. In this study, a diesel engine under dual loop EGR system was optimized by using design of experiment (DoE). Some dominant variables were determined which had effects on torque, BSFC, NOx, and EGR rate. As a result, optimization was performed to compensate the torque and BSFC by controlling start of injection (SOI), injection mass and EGR valves, etc.