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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
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
Experimental Study to Improve the Performance of the Pretensioner for a Passenger Vehicle
Jung, Sung-Pil ; Park, Tae-Won ; Song, Taeck-Rim ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 1~6
This study presents the practical design modification to improve the retracting performance of the pyro-typed high power pretensioner. 3 components of the pretensioner are redesigned and the usefulness of the design modification is verified by the experiment. During the pretensioning process, the gas blast generated from the gunpowder is transferred to the rack-pinion gear through the manifold. The rack-pinion gear is connected with the spool where the webbing is rolled up. According to the rotation of the pinion, the spool is turned and the webbing is winded. To help the gas blast flow well, the shape of the inner cross section of the manifold is changed. The spur gear design program is developed and used to find the best combination of the rack-pinion gear pair to increase the power transmission efficiency. The pinion guide is installed on the spool to prevent the vibration of the pinion. As a result of the experiment, the amount of the web retraction length is increased when every single design modification is applied. Therefore, the retracting performance of the pretensioner is considered to be improved if the presented design modifications are applied.
Numerical Analysis for Prediction of the Residual Gas Fraction, Volumetric Efficiency and Pumping Loss with Continuous Variable Valve Lift System in an SI Engine
Cho, Yong-Seok ; Lee, Seang-Wock ; Jang, Ik-Kyoo ; Park, Jung-kwon ; Yoon, Yu-Bin ; Park, Young-Joon ; Kim, Hyun-Chul ; Na, Byung-Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 7~13
To satisfy the needs on fuel economy and engine performance, continuous variable valve lift systems are applying to engines. In the CVVL system, fuel economy can be improved by reducing pumping loss during the induction process, and engine performance can be also improved by controlling volumetric efficiency and the residual gas fraction. Because the residual gas fraction directly affects volumetric efficiency, engine performance, combustion efficiency and emissions in SI engines, controlling residual gas fraction is one of the important things in engine development process. This analysis investigates the residual gas fraction and volumetric efficiency with changes of intake valve lifts and intake valve timings. In this study, unsteady state solutions were solved during exhaust and induction processes. Results show variation of the residual gas fraction and volumetric efficiency by changing intake valve timing and lift. Decreasing intake valve lift leads to increase the residual gas fraction and to decrease volumetric efficiency.
Brake Performance Analysis of Sliding Mode Controller by Comparing with a Commercial Anti-lock Brake System
Yun, Duk-Sun ; Baek, Seung-Hwan ; Kim, Heung-Sup ; Song, Jung-Hoon ; Boo, Kwang-Suck ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 14~23
This paper analyzes braking performance of ABS with Sliding Mode Controller, which is designed in this research and compared with that of a commercial ABS-ECU only. HILS system for this paper has an existing hydraulic brake line with an ECU of commercial passenger vehicle and it is designed to be cooperated with Sliding Mode Controller and hydraulic line. This paper shows the simulation results to meet the target slip ratio on the various road conditions and displays the performance with Sliding Mode Controller has an improvement than a commercial ABS.
Numerical Modeling of Vanadia-based Commercial Urea-SCR plus DOC Systems for Heavy-duty Diesel Exhaust Aftertreatment Systems
Yun, Byoung-Kyu ; Kim, Chong-Min ; Kim, Man-Young ; Cho, Gyu-Baek ; Kim, Hong-Suk ; Jeong, Young-Il ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 24~30
In this study, numerical experiments were carried out to estimate the SCR De-NOx performance in DOC plus SCR systems. The SCR De-NOx phenomena are described by Langmuir-Hinshelwood reaction scheme. After validating the present approach by comparing the present results with the experimental results, such various parameters as space velocity,
/NOx ratio and relative volume of DOC are explored to increase the SCR De-NOx performance. The results indicate that SCR De-NOx performance largely depends on space velocity and
/NOx ratio, especially below
. SCR De-NOx performance is seriously affected by relative volume of DOC with SCR due to increasing in
/NOx ratio at below
A Study for Developing Process of a Bus Body Structure for the Rollover Safety
Park, Jae-Woo ; Park, Jong-Chan ; Yoo, Seung-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 31~38
Bus manufacturers have tested and studied the dynamic collapse behavior of a bus body structure in rollover since UN ECE established ECE Regulation 66 to provide the requirement for the strength of bus structure. In spite of the costly cycles of practical tests, however, it is still a hard task to meet the rollover regulation by means of local reinforcements in the bus structure. Therefore it is necessary to develop a well designed strategy for the rollover strength implemented in the early stage of vehicle development. In this study, the suitable development method for each design stage from a component to complete body structure was considered to make a well-established development process of a bus body structure for rollover safety. For the efficient approach of the concept design stage, a numerical model based on the plastic hinge theory was used instead of detailed shell models. After setting up the concept design for the component size and geometry, the shell model was used to confirm and optimize the whole structure composition. The process developed in this study was practically used as an effective method to predict the rollover behavior of a new bus body structure.
Implementation of FlexRay Network System using Node-based Scheduling Method
Kim, Man-Ho ; Ha, Kyoung-Nam ; Lee, Suk ; Lee, Kyung-Chang ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 39~47
As vehicles become intelligent for convenience and safety of drivers, in-vehicle networking (IVN) systems are essential components of intelligent vehicles. Recently, the chassis networking system which require increased network capacity and real-time capability is being developed to expand the application area of IVN systems. Also, FlexRay has been developed for the chassis networking system. However, FlexRay needs a complex scheduling method of static segment, which is a barrier for implementing the chassis networking system. Especially, if we want to migrate from CAN network to FlexRay network using CAN message database that was well constructed for the chassis networking system by automotive vendors, a novel scheduling method is necessary to be able to reduce design complexity. This paper presents a node-based scheduling method for FlexRay network system. And, in order to demonstrate the method's feasibility, its performance is evaluated through an experimental testbed.
A Study on the Characteristics of Steering Angle Sensor using Magnetic Induction
Kim, Byeong-Woo ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 48~55
We have development the steering angle sensor using not only detecting parts but also integrating technique with semiconductors for automobile applications. The performance design and analysis of the steering angle sensor for intelligent vehicles is complicated due to variety of parameters. In this study, the performance characteristics of the angle sensor were analyzed using test rig. By means of magnetic induction technique, these new the steering angle sensors showed excellent magnetic characteristics. The detection range of steering angle sensor obtained was
, the maximum non-linearity is 0.744% Full Span and the temperature range was
. With this conclusive, the inductive angle sensor was quite satisfactory for many applications in intelligent vehicles.
Construction of Modified Yield Loci with Respect to the Strain Rates using Hill48 Quadratic Yield Function
Lee, Chang-Soo ; Bae, Gi-Hyun ; Kim, Seok-Bong ; Huh, Hoon ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 56~60
Since the forming process involves the strain rate effect, a yield function considering the strain rate is indispensible to predict the accurate final blank shape in the forming simulation. One of the most widely used in the forming analysis is the Hill48 quadratic yield function due to its simplicity and low computing cost. In this paper, static and dynamic uni-axial tensile tests according to the loading direction have been carried out in order to measure the yield stress and the r-value. Based on the measured results, the Hill48 yield loci have been constructed, and their performance to describe the plastic anisotropy has been quantitatively evaluated. The Hill48 quadratic yield function has been modified using convex combination in order to achieve accurate approximation of anisotropy at the rolling and transverse direction.
Application and Verification of Virtual Manufacturing to Hot Press Forming Process with Boron Steel
Suh, Yeong-Sung ; Ji, Min-Wook ; Lee, Kyung-Hoon ; Kim, Young-Suk ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 61~66
A virtual manufacturing system that is composed of JMatPro, a material modeler and
-HT, a finite element package is applied to the hot press forming process: high temperature material properties for each phase such as flow stress, elastic modulus, Poisson's ratio, thermal expansion coefficient, in addition to TTT curve are predicted by JMatPro and taken into
-HT to predict the material behavior considering phase transformation and heat transfer simultaneously. In order to verify the accuracy of computation, the residual stress and the springback were compared with the experimental measurements. Both the predicted and measured principal residual stresses and amount of springback were in good agreement. It was also found that the residual stresses generated from hot press forming are not negligible as it has been generally assumed, although the springback deformation is quite small.
Analysis of Vehicle Handling Performance due to Camber Angle Change of Rear Wheel
Park, Seong-Jun ; Sohn, Jeong-Hyun ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 67~73
In this study, a camber angle generating mechanism for rear suspension is suggested. An experimental device is implemented and tested. A full vehicle model with camber angle generating device by using ADAMS/Car is modeled. Rear left wheel and rear right wheel have 5 different camber angles in the simulations, respectively. Step steer and pulse steer simulations are carried out for investigating the effects of vehicle handling performance due to camber angle control of rear suspension. According to the results, the camber angle of rear suspension affects the vehicle handling performance during both simulations. Therefore, when the vehicle makes the right turn or left turn, left and right wheel should have the proper orientation for improving the handling performance, respectively.
The Evaluation of Fretting Fatigue Behavior on Rotary Bending Fatigue for Railway Axle Material
Choi, Sung-Jong ; Kwon, Jong-Wan ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 74~82
Fretting damage can be observed in automobile and railway vehicle, fossil and nuclear power plant, aircraft etc. In the present study, railway axle material RSA1 used for evaluation of fretting fatigue life. Plain and fretting fatigue tests were carried out using rotary bending fatigue tester with proving ring and bridge type contact pad. Through these test, the following results are obtained: 1) it is found that the fretting fatigue limit of standard specimen decreased about 37% compared to the plain fatigue limit. 2) The early crack of Shinkansen type specimens initiated in contact area and final fractured below samp=214 MPa. 3) The early crack of all TGV type specimens initiated in rounded area and fractured. 4) Tire tracks and rubbed scars were observed in the oblique crack region and fatigue crack growth region of fracture surface. 5) The wear debris is observed on the contact surface, and oblique cracks at an earlier stage are initiated in contact area. These results can be used as useful data in a structural integrity evaluation of railway axle.
An Analysis about the Behavior of the Wiper Blade Including Incompressibility
Chung, Won-Sun ; Song, Hyun-Seok ; Park, Tae-Won ; Jung, Sung-Pil ; Kim, Wook-Hyeon ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 83~90
The windshield wiper consists of 4 parts: a blade, an arm, a linkage and a motor. The wiper blade makes contact with the windshield and is designed to be operated normally at an angle of 30~50 degrees to the front glass. If the contact pressure between the wiper blade and windshield surface is too high, noise and wear of the rubber will result. On the other hand, if the contact pressure is too low, the performance will do badly, since foreign substances such as dust and stains will not be removed well. The pressure and friction of the wiper blade has a great influence on its effectiveness in cleaning the front window. This is due to the contact of the rubber with the window. This paper presents the dynamic analysis method to estimate the performance of the flat type blade of the wiper system. The blade has a nonlinear characteristic since the rubber is an incompressible hyper-elastic and visco-elastic material. Thus, Structural dynamic analysis using a complex contact model for the blade is performed to find the characteristics of the blade. The flexible multi-body dynamic model is verified by the comparison between test and analysis result. Also, the optimization using the central composite design table is performed.
Optimum Shape Design of the Spring to Improve the Loose-proof Performance of the Lock Nut
Song, Hyun-Seok ; Chung, Won-Sun ; Jung, Do-Hyun ; Seo, Young-Kyo ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 91~96
The combination of a bolt and nut is the element most widely used for connecting machines and structures. When a load is repetitively applied in the direction right angle to the bolt axis after the bolt and nut is fastened, the nut gradually becomes loose. To solve this problem, in this study, a new type of the loose-proof nut, called a lock nut, is developed. The lock nut is equipped with a spring, and the spring increases the axial force of the bolt. Then, the connection force between the bolt and nut is also augmented. Three dimensional finite element models for the bolt and spring are generated, and the change of the axial force of the bolt while the bolt is being inserted into the spring is analyzed using MSC/Marc, a commercial finite element program. Finally, the optimum shape of the spring is found according to the response surface analysis methodology. The optimization result is verified by comparing the variation of the axial force of the bolt when the bolt is inserted to the initial and optimized spring.
Some Considerations of the Ignition Delay Period in D.I Diesel Engine
Bang, Joong-Cheol ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 97~103
The four combustion stages in a diesel engine have close correlation among them. Especially, the ignition delay period has significant effect on the following combustion stage. And the period is also one of inevitable combustion processes in the diesel engine. For example, the diesel knocking is a well-known phenomenon due to the long ignition delay period. The interval of the ignition delay period is affected by the mixture formation process in the cylinder. However, in the case of the D.I. diesel engine, the available duration to make the mixture formation of air-fuel is very short. In addition, the means of the mixture formation mainly depends on the injection characteristics and properties of the fuel. It is difficult to make complete mixture. Therefore, an early stage of combustion is violent, which leads to the weakness of noise and vibration. In this study, using the visible engine, we measured the ignition delay period by photo sensor which detect occurrence of flame and presented the factors of the injection characteristics such as kinds of injection system, the injection pressure and the injection timing. The relation between the ignition delay period and cylinder pressure diagram which was concurrently obtained was also estimated.
The Accident and Injury Characteristics of Elderly Drivers on Lateral Impact
Hong, Seung-Jun ; Park, Won-Pil ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 104~113
Domestic insurance claims were statistically investigated to analyze the elderly driver's accident patterns and injury types in side impact crashes. Medical treatment records and accident vehicle damage photos have been surveyed for 5,419 cases. The results of our statistical analysis showed that the thorax injury risk of the elderly drive group is 8.8 and 4.0 times higher than that of the young and middle age group respectively. Diagnosis showed that most thorax injuries were caused by rib fracture. The head injury risk of the elderly female driver group seemed to be higher than that of the younger female driver group, however, statistical test has not been conducted because of the lack of number of samples for elderly female accident.
Vibration Isolation System for Driver's Seats with Negative Stiffness
Park, Sung-Tae ; Lee, Sang-Joo ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 114~121
As a vehicle speed increases, more vibration energy is transmitted from chassis to a driver. Current isolation system for the driver's seat by damping control can reduce the transmitted vibration energy near resonance area. But in higher frequency region than natural frequency multiplied by
, the vibration energy transmitted to the driver has a tendency to be increased. Therefore, the method by natural frequency reduction of the system is preferred to increase the effectiveness of the anti-vibration. However, the natural frequency could not be freely reduced due to the nature of the isolation system structure. A new passive suspension system to reduce the natural frequency is proposed. The theoretical analysis and experimental results show better vibration attenuation compared with the current isolation system.
Study on the Performance Characteristics of Urea-SCR System in the ETC Test
Ham, Yun-Young ; Choi, Dong-Seok ; Park, Yong-Sung ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 122~128
To meet the NOx limit without a penalty of fuel consumption, urea-SCR system is currently regarded as promising NOx reduction technology for diesel engines. SCR system has to achieve maximal NOx conversion in combination with minimal
slip. In this study, the performance characteristics of urea-SCR system with open loop control were assessed in the European Transient Cycle(ETC) for heavy duty diesel engine. The SCR inlet temperaure varied in the range of 200 to
in the ETC cycle. Open loop control calculated the urea flow rate based on the NOx and NSR map which gave for each combination of SCR inlet temperature and space velocity the normalized
to NOx stoichiometric ratio which resulted in a steady-state
slip of 20ppm. During the ETC cycle, the open loop control with the optimized NSR offset achieved NOx reduction of 80% while keeping the average
slip below 10ppm and maximum 20ppm. It was also found that NOx sensor was cross-sensitive to
and a control strategy for cross-sensitivity compensation was required in order to use a NOx sensor as feedback device.
Simulation-based Optimum Allocation of a Resonator for Reducing the Blow Noise of a Turbocharger in a Diesel Engine
Kang, Yong-Hun ; Choi, Dong-Hoon ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 129~134
A diesel engine is equipped with a turbocharger for providing more power at a low engine speed region by supplying charge air to combustion chambers. The turbocharger makes it possible to satisfy stringent emission regulations and customers' demand of enjoying the fun to drive by increasing engine performance. However, the turbocharger has the disadvantage of making BPF(Blade Passing Frequency), hissing, surge, whistle, and blow noises. Among them, reducing the blow noise, a narrow-band noise(a general range : 1800~2000Hz), is possible by using a resonator that controls the narrow frequency band governing the resonance in the intake system. In this study, the optimum location of the resonator is found by employing Boost as a CAE(Computer Aided Engineering) tool and is confirmed by experiments of an engine dynamo test and a real vehicle test.
Effects of Pitch Length of Stack-type EGR Cooler on Heat Exchange Characteristics in a Diesel Engine
Hwang, Se-Joon ; Kim, Min-Chol ; Jang, Sang-Hoon ; Kim, Hyung-Man ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 135~140
An important goal in diesel engine research is the development of a means to reduce the emissions of nitrogen oxides (NOX). The use of a cooled exhaust gas recirculation (EGR) system is one of the most effective techniques currently available for reducing nitrogen oxides. Since Particular Matter (PM) fouling reduces the efficiency of an EGR cooler, a trade-off exists between the amount of NOX and PM emissions, especially at high engine loads. In the present study, engine dynamometer experiments have been performed to investigate the heat exchange characteristics of the stack-type EGR coolers with wave fin pitches of 3.6 and 4.6 mm. The results show that the heat exchange effectiveness is decreased as surface area decrease with pitch of 4.6 mm due to PM fouling. As surface area increase at pitch of 3.6 mm, super-cooling happens in the recirculated exhaust gas.
Vibration Analysis of Body Mount System on Chassis Frame
Lee, Chang-Ro ; Ryu, Bong-Jo ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 2, 2010, Pages 141~146
This paper describes the static and dynamic characteristics of body mount system which are to be considered in the early design stage. At every location of body mount the static load and dynamic response to road input were calculated using the half car model. Normal mode analysis for the half car model was also performed. In the analysis the design parameters such as the stiffness of mount rubbers and their distribution on mount location were examined for improving ride comfort especially in the lower frequency range.