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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 13, Issue 6 - Nov 2005
Volume 13, Issue 5 - Sep 2005
Volume 13, Issue 4 - Jul 2005
Volume 13, Issue 3 - May 2005
Volume 13, Issue 2 - Mar 2005
Volume 13, Issue 1 - Jan 2005
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Spray Characteristics of High Pressure Gasoline Swirl Injector with Various Cross-flow Speeds
Choi Jaejoon ; Lee Youngseok ; Choi Wook ; Bae Choongsik ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 1~8
The spray prepared for direct fuel injection into cylinder is of great importance in a DISI(Direct Injection Spark Ignition) engine. The interaction between air flow and fuel spray was investigated in a steady flow system embodied in a wind tunnel to simulate the variety of in-cylinder flow conditions in the DISI engine. The Mie-scattering images presented the macroscopic view of the liquid spray fields interacting with cross-flow Particle sizes of fuel droplets were measured with phase Doppler anemometer(PDA) system. A faster cross-flow field made SMD larger and
smaller. The atomization and evaporation processes with a DISI injector were observed and consequently utilized to construct the database on the spray and fuel-air mixing mechanism as a function of the flow characteristics.
An Experimental Study on the Flow Characteristics and the Stratification Effects in Visualization Engine Using the DPIV and the Entropy Analysis
Lee Changhee ; Lee Kihyung ; Lee Changsik ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 9~18
The objective of this study is to analyse the spray characteristics according to the injection duration under the ambient pressure condition, and the injection timing in the visualization engine. In order to investigate the spray behavior, we obtained the spray velocity using the PIV method that has been an useful optical diagnostics technology, and calculated the vorticity from spray velocity component. These results elucidated the relationship between vorticity and entropy which play an important role in the diffusion process for the early injection case and the stratification process for the late injection case. In addition, we quantified the homogeneous diffusion rate of spray using the entropy analysis based on the Boltzmann's statistical thermodynamics. Using these method, it was found that the concentration of spray droplets caused by the increase of injection duration is more effective than the increase of momentum dissipation. We also found that the homogeneous diffusion rate increased as the injection timing moved to the early intake stroke process and BTDC
was the most efficient injection timing for the stratified mixture formation during the compression stroke.
An Experimental Study on the Spray Behaviors of Swirl and Slit Injector to Direct Injection Spark Injection Engine
Lee Changhee ; Lee Kihyung ; Choi Youngjong ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 19~27
The spray characteristics of DISI injector has a great role in engine efficiency and emission. Thus, many researchers have been studied to investigate the spray characteristics of hollow cone type and slit type injector which are used in DISI engine. In this study, we tried to provide spray parameters which effect on the spray characteristics such as injection pressure, ambient pressure and ambient temperature. In addition, we calculated
to investigate the break up mechanism of test injectors and also obtained
to evaluate the spray characteristics. From this study, As the ambient pressure increases in case of slit injector,
Various Injection Conditions and Fuel Control of an LPG Liquid Injection Engine
Sim Hansub ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 28~35
Fuel injection rate of an injector is affected by various injection conditions such as injection duration, fuel temperature, injection pressure, and voltage in LPG liquid injection systems for either a port-fuel-injection(PFI) or a direct injection(DI) in a cylinder. Even fuel injection conditions are changed, the air-fuel ratio should be accurately controlled to educe exhaust emissions. In this study, correction factor for the fuel injection rate of an injector is derived from the density ratio and the pressure difference ratio. A voltage correction factor is researched from injection test results on an LPG liquid injection engine. A compensation method of the fuel injection rate is proposed for a fuel injection control system. The experimental results for the LPG liquid injection system in a SI-engine show that this system works well on experimental range of engine speed and load conditions. And the fuel injection rate is accurately controlled by the proposed compensation method.
Estimation of the Rubber Material Property by Successive Zooming Genetic Algorithm
Kwon Youngdoo ; Kim Jaeyong ; Lee Jaekwan ; Kwon Hyunwook ; Han Insik ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 36~44
Nowadays, various kind of rubber-like materials are used in industry. These are usually installed in automobiles, trains, etc. They work as dampers or important parts in the system, and the applications for rubber-like materials are increasing. In the past days, rubber engineers and designers predicted rubber material behaviors by the analytic method for limited problems. With the progress of digital computers, Finite Element Methods is widely used for analyzing the rubber-like materials. The popular methods predicting rubber material property are curve fitting and least square method, but there are some problems such as low precision and tedious solving process. Here, we introduce a method estimating rubber material property by successive zooming genetic algorithm(SZGA). The proposed algorithm offers more precise rubber property. To demonstrate the effectiveness of the proposed algorithm, we compared this method with Haines & Wilson's method, MARC, ABAQUS.
Contact Stress Analysis of Stick Type Ignition Coil Jacket PBT
Kim Yangsul ; Kim Namsu ; Lee Jongseok ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 45~50
Stick type ignition coil(called a Cigar coil) is a kind of transformer for an automobile modulaized of distributer and electric cable. A material of cigar coil is PBT
resin. This is an excellent engineering plastic with both mechanical and electrical properties. When we insert an HV terminal into the PBT
resin jacket, it breaks the jacket, because the HV terminal is bigger than the jacket. It is a fatal on durability of a part. In this study, We used ANSYS FEM tool in order to stress analysis by contact. In order to automatically estimate possible maximum diameter of an HV terminal, we used an APDL. In the contact part, we considered the relation of the HV terminal's diameter with the amount of stress that occurred. This relation is able to be applied, in part, to the dimensions of the part design.
A Study on the Co-flow Diffusion Flame Temperature Measurement at Various Fuel Flows Rate Using the Rapid Insertion Technique
Han Yongtaek ; Lee Kihyung ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 51~59
Co-flow laminar diffusion flames' temperature has been studied experimentally for ethylene
using a co-flow burner in order to investigate the characteristics of diffusion flame's temperature distribution. The temperature distributions in the flame were measured by rapid insertion of a R-type thermocouple. The measurement area was divided into three zones. 1st area was expect to created PAH zone, Il nd area was expect to form soot zone, which is known to generate most soot volume fraction, and III rd area was expect to from soot oxidization zone. Also The temperature along the flame y-axis as a fuel quantity was measured. As a results, we have measured temperature neglecting the effect of soot particles attached to the thermocouple junction, which is close to the nozzle and upstream zone has a unstable flow in co-flow diffusion flame and acquires that the flame y-axis temperature has a uniform temperature in the generated soot volume fraction zone(II nd).
A Study on Characteristics of Mild Combustion using the Radiative Flamelet Model
Kim Gunhong ; Kim Yongmo ; Ahn Kookyoung ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 60~67
Mild combustion or Flameless oxidation(FLOX) have been considered as one of the most prospective clean-combustion technologies to meet both the targets of high process efficiency and low pollutant emissions. A mild combustor with high air preheating and strong internal exhaust gas recirculation is characterized by relatively low flame temperature, low NOx emissions, no visible flame and no sound. In this study, the Steady Flamelet Approach has been applied to numerically analyze the combustion processes and NOx formation in the mild combustor. The detailed discussion has been made f3r the basic characteristics of mild combustor, numerical results and limitation of the present combustion modeling.
Flamelet Modelling of Soot Formation and Oxidation in a Laminar
Kim Gunhong ; Kim Hoojoong ; Kim Yongmo ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 68~75
By utilizing a semi-empirical soot model, the applicability of the laminar flamelet concept fur simulating the formation and oxidation of soot in the laminar diffusion flame has been studied. The source terms for two transport equations of the soot formation and oxidation are calculated in the mixture fraction/scalar dissipation rate space for laminar flamelets and stored in a library. In this study, emphasis is given to the interaction associated with radiation and soot formation. The radiative heat loss is obtained by solving the radiative transfer equation using the unstructured grid finite volume method with the WSGGM. The calculated temperatures and soot volume fractions agree relatively well with the experimental data and the previous numerical results of Kaplan et al. using the detailed chemistry.
Validation of Driver Steering Model with Vehicle Test
Chung Taeyoung ; Lee Gunbok ; Yi Kyongsu ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 76~82
In this paper, validation of Driver Steering Model has been conducted. The comparison between the simulation model and vehicle test results shows that the model is very feasible for describing combined human driver and actual vehicle dynamic behaviors. The 3D vehicle model is consisted of 6-DOF sprung mass and 4-quarter car model for vehicle body dynamics. Powertrain model including differential gear and Pacejka tire model are applied. The driver steering model is also validated with vehicle test result. The driver steering model is based on angle and displacement error from the desired path, recognized by driver.
Design of Vehicle Stability Control Algorithm Based on 3-DOF Vehicle Model
Chung Taeyoung ; Yi Kyongsu ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 83~89
This paper presents vehicle stability control algorithm based on 3-DOF vehicle model. The brake control inputs have been directly derived from the sliding control law based on a three degree of freedom plane vehicle model with differential braking. The simulation has performed using a full nonlinear 3-dimensional vehicle model and the performance of the controller has been compared to that of a direct yaw moment controller. Simulation results show that the proposed controller can provide a vehicle with better performance than conventional controller with respect to brake actuation without compromising stability at critical driving conditions.
Performance and Transmission Efficiency Analysis of 2-Mode Hydro Mechanical Transmission
Jung Gyuhong ; Kim Hyoungeui ; Kim Jongki ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 90~98
HMT is a type of continuously variable transmission which has split power flow path characteristics with gear train and hydro static unit. The benefit of improved fuel economy and high power capacity enables it to be a promising application fur large vehicles. This paper presents the analysis results including velocity, static torque, transmission efficiency and dynamic model of the HMT that is developed for city buses. The speeds or gear shafts, the static clutch torque and split power ratio for each mode are detailed here. From the analysis of HMT transmission efficiency considering the power loss in meshed gear and hydraulic unit, we can conclude that minimization of hydraulic power is necessary for improved fuel economy design. Also, the dynamic simulation result for mode shift characteristics shows that little shift shock is observed because of the synchronized rotation speed in clutch.
Development of an Efficient Vehicle Dynamics Model Using Massless Link of a Suspension
Jung Hongkyu ; Kim Sangsup ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 99~108
This paper represents an efficient modeling method of a suspension system for the vehicle dynamic simulation. The suspension links are modeled as composite joints. The motion of wheel is defined as relative one degree of freedom motion with respect to car body. The unique relative kinematic constraint formulation between the car body and wheel enables to derive equations of motion in terms of wheel vertical motion. Thus, vehicle model has ten degrees of freedom. By using velocity transformation method, the equations of motion of the vehicle is systematically derived without kinematic constraints. Various vehicle simulation such as J-turn, slowly increasing steer, sinusoidal sweep steer and bump run has been performed to verify the validity of the suggested vehicle model.
Vehicle Dynamics Modeling and Correlation Using the Kinematic and Compliance Test of the Suspension
Kim Sangsup ; Jung Hongkyu ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 109~118
A functional suspension model is proposed as a kinematic describing function of the suspension that represents the relative wheel displacement in polynomial form in terms of the vertical displacement of the wheel center and steering rack displacement. The relative velocity and acceleration of the wheel is represented in terms of first and second derivatives of the kinematic describing function. The system equations of motion for the full vehicle dynamic model are systematically derived by using velocity transformation method of multi-body dynamics. The comparison of field test results and simulation results of the ADAMS/Car demonstrates the validity of the proposed functional suspension modeling method. This model is suitable for real-time vehicle dynamics analysis.
Shape Optimization of the Lower Control Arm using the Characteristic Function and the Fatigue Analysis
Park Youngchul ; Lee Donghwa ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 119~125
The current automotive is seeking the improvement of performance, the prevention of environmental pollution and the saving of energy resources according to miniaturization and lightweight of the components. And the variance analysis on the basis of structure analysis and DOE is applied to the lower control am. We have proposed a statistical design model to evaluate the effect of structural modification by performing the practical multi-objective optimization considering weight, stress and fatigue lift. The lower control arm is performed the fatigue analysis using the load history of real road test. The design model is determined using the optimization of acquired load history with the fatigue characteristic. The characteristic function is made use of the optimization according to fatigue characteristics to consider constrained function in the optimization of DOE. The structure optimization of a lower control arm according to fatigue characteristics is performed. And the optimized design variable is D=47 m, T=36mm, W=12 mm. In the real engineering problem of considering many objective functions, the multi-objective optimization process using the mathematical programming and the characteristic function is derived an useful design solution.
Fault Detection Analysis by Using a Machinery Fault Simulator
Bae Taehan ; Jang Sukdong ; Song Chul Ki ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 126~131
This paper presents experimental results by using the machinery fault simulator which is monitoring its conditions with an acceleration signal. Components of the machinery, for example, motor, belt pulley, belt, bearing, and gear, with artificial defects were used for the experiment.
A Biomechanical Analysis in the Neck Injury according to the Position of Read Restraint During Low Speed Rear-End Impacts
Jo Huichang ; Kim Youngeun ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 132~139
The driving position of head restraints and the relative risk of neck injury were studied in the computer simulation. MADYMO human model with the detail neck model was used to define the magnitude and direction of internal forces acting on the cervical spine during rear-end impact and to determine the effect of the initial position of the occupant's head with respect to the head restraints. Maximum reaction forces were generated during the head contact to the restraint and relatively large forces were generated at each spinal components in lower cervical spine in proportion to backset and height distance increasement.
Evaluation of Static/Dynamic Structural Strength for Automotive Round Recliner
Lee Dongjae ; Park Changsoo ; Lee Kyoungteak ; Kim Sangbum ; Kim Heonyoung ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 140~146
This study presents the development of a round recliner using the finite element method. That reduces the number of test repeating times and gives an information about stiffness. A simulation model of round recliner mounting seat module and tooth strength simulation are established using a PAM-CRASH and ABAQUS. With the optimization of gear profile, structural strength design of round recliner was achieved. The round recliner seat module simulation, structure strength simulation and a crash safety are requested by FMVSS test. Solution of round recliner optimum variable study and design problem are searched for round recliner stress, deformation and application. Also an examination of safety is made.
Fatigue Durability Analysis and Evaluation for Straighted Type Exhaust System of Automobile
Park Sejong ; Suh Hocheol ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 147~152
The exhaust system of automobile is faced with random or spectrum types of fatigue loads during usage life and so needs to be closely estimated for quality and performance to have enough certainty on design endurance lift during preliminary design process. Structural operation conditions, operation load history, property of material and manufacturing process etc. should be considered by performing experiment approach. Using the software program for predicting fatigue life quickly and exactly in preliminary design stage saves plenty of time and cost generated by fatigue tests. In this paper, fatigue life prediction was performed on the basis of fatigue analysis using MSC/FATIGUE and load data from field test and the life of development items was estimated and compared through the results.
Creep Behaviour of Solution Treated Alpha Titanium Alloy for Automotive Parts
Hwang Kyungchoong ; Yoon Jongho ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 153~158
Titanium alloy has widely been used as material for automotive parts because it has high specific strength. It is also light and harmless to human body. But, we have little design data about the creep behaviors of the alloy. Therefore, in this study, creep tests under four constant stress conditions have been conducted with low different temperature conditions. A series of creep tests had been performed to get the basic design data and life prediction of titanium products and we have gotten the fallowing results. First, the stress exponents decrease as the test temperatures increased. Secondly, the creep activation energy gradually decrease as the stresses became bigger. Thirdly, the constant of Larson-Miller parameter on this alloy was estimated as about 7.5. And for the last, the fractographs at the creep rupture showed the ductile fracture due to the intergranullar rupture.
The Effect of Compressive Residual Stress of Spring Steel for Vehicle on Corrosion
Park Keyungdong ; An Jaepil ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 159~165
Shot peening can be defined as the process of work hardening of the surface of components by means of propelled stream of spherical shot. Benefits due to shot peening are increase in resistance to fatigue, stress corrosion cracking, fretting, galling, erosion and closing of pores. In this study, the influence of shot peening on the corrosion was investigated on spring steel immersed in
. The immersion test was performed on the two kinds of specimens. Corrosion potential, polarization curve, residual stress and etc. were investigated from experimental results. From test results, the effect of shot peening on the corrosion was evaluated. The important results of the experimental study on the effects of shot peened spring steels on the environment corrosion are as follows; In case of corrosion potential, shot peened specimen shows more activated negative direction as compared with parent metal. Surface of specimen, which is treated with the shot peened, is placed as more activated state against inner base metal. It can cause the anti-corrosion effect on the base metal.
Vehicle Stability Control for a 4WD HEV using Regenerative Braking and Electronic Brake force Distribution
Kim Donghyun ; Kim Hyunsoo ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 166~173
A vehicle stability control logic for 4WD hybrid electric vehicle is proposed using the regenerative braking of the rear motor and electronic brake force distribution module. Performance of the stability control logic is evaluated for J-turn and single lane change. It is found from the simulation results that the regenerative braking at rear motor is able to provide improved stability compared with the vehicle performance without my stability control. Additional improvement can be achieved by applying the regenerative braking plus electronic brake farce distribution control. It is expected that the regenerative braking offers additional improvement of the fuel economy as well as the vehicle stability control.
Optimal Driving Mode Analysis for Reducing Energy Consumption in Electric Multiple Unit
Kim Chi Tae ; Kim Dong Hwan ; Park Young Il ; Han Sung Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 174~183
A train driving requires to n the fixed distance within given time, and it is desirable to consume low energy if necessary. Reducing energy consumption depends on the train operation modes by either manual or automatic operation. In this article, an operation to reduce energy consumption by changing modes of train operation by a driver without changing the train operation requirement is investigated. The powering model, braking model and consumed energy calculation model are developed, then simulated by using a Matlab software. The accuracy of the train dynamic model established by the simulations is verified by comparing with the real experimental data. Several simulations by various operations in the real track are executed, then the desirable pattern of train driving is found.
A Study on Product Data Quality Assurance for Automotive Industry
Yang Jeongsam ; Han Soonhung ; Kang Hyejeong ; Kim Junki ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 184~193
Digital representations of products and parts have largely replaced physical drawings as the form in which product data are stored, analyzed, and communicated among the people contributing to the design of an automobile. Many individuals and companies participate in the design of an increasingly complex automobile; hence, the design process depends critically on team members' ability to share information about essential design elements. These trends have elevated the importance of the quality of product data and its efficient exchange. In this paper, we show state-of-the-art on Product Data Quality(PDQ), and activities of PDQ assurance. And we propose a novel design history-based approach for diagnosis and healing of a CAD model.
Timing Analysis of Distributed Real-time Control System using Response-time Analysis Tool
Choi Jaebum ; Shin Minsuk ; Sunwoo Myoungho ; Han Seogyoung ;
Transactions of the Korean Society of Automotive Engineers, volume 13, issue 1, 2005, Pages 194~203
The process of guaranteeing that a distributed real-time control system will meet its timing constraints, is referred to as schedulability analysis. However, schedulability analysis algorithm cannot be simply used to analyze the system because of complex calculations of algorithm. It is difficult for control engineer to understand the algorithm because it was developed in a software engineer's position. In this paper we introduce a Response-time Analysis Tool(RAT) which provides easy way far system designer to analyze the system by encapsulating calculation complexity. Based on the RAT, control engineer can verify whether all real-time tasks and messages in a system will be completed by their deadline in the system design phase.