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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 17, Issue 6 - Nov 2009
Volume 17, Issue 5 - Sep 2009
Volume 17, Issue 4 - Jul 2009
Volume 17, Issue 3 - May 2009
Volume 17, Issue 2 - Mar 2009
Volume 17, Issue 1 - Jan 2009
Selecting the target year
Comparison and Analysis for Evaluation of Ride and SEAT Index through Theoretical Seat-Human Body Model and Vehicle Test
Son, In-Suk ; Kim, Jung-Hoon ; Kang, Yeon-June ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 1~9
A simplified model of seat-human body is presented to analyze vibrations of human body on a seat of vehicle. The theoretical model having seven degrees-of-freedom is composed of the inter-connected masses, springs and dampers. Until now, evaluation of ride comfort has been usually performed only through vehicle tests. This study aims to complement shortcomings of conventional vehicle tests in evaluation of ride comfort by using the theoretical model. The acceleration values of the human body are obtained from frequency response functions of the theoretical model. Thereafter, Ride and SEAT indexes are acquired by considering response characteristics of the human body for the 12 axes that are presented in BS 6841. A vehicle test is carried out to measure the acceleration values for the three parts of the human body such as upper body, hip and foot. Ride and SEAT indexes of the vehicle test are also obtained by considering the response characteristics of the human body, of which results are compared with the values from the theoretical model. It is found that the theoretical results are in good agreement with the experimental results.
Study on the Characteristics of Carbon Dioxide Emissions Factors from Passenger Cars
Yoo, Jeong-Ho ; Kim, Dae-Wook ; Yoo, Young-Sook ; Eum, Myung-Do ; Kim, Jong-Choon ; Lee, Sung-Wook ; Baik, Doo-Sung ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 10~15
Emission regulations on greenhouse gas(GHG) in automobiles have been stringent because of global warming effect. Over 90% of total GHG emission are carbon dioxides and about 20% of this
emission are emitted from automobiles. In this study, 110 vehicles were tested on a chassis dynamometer and
emissions and fuel economy were measured in order to investigate the characteristics of
emission factor from passenger vehicles which are the most dominant vehicle type in Korea. The characteristics of emissions in accordance with displacements, gross vehicle weight, NIER and CVS-75 speed mode were discussed. It was found that vehicles having larger displacement, heavier gross vehicle weight, automatic transmission and specially at cold start emitted more
emissions. From these results, correlation between
emission and fuel economy was also obtained. This study may contribute to evaluate domestic greenhouse gas emissions and establish national policies on climate changes in future.
Development of a Driving Simulator for Telematics Human-Machine Interface Studies
Koo, Tae-Yun ; Kim, Bae-Young ; Shin, Hee-Jong ; Son, Young-Tak ; Suh, Myung-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 16~23
Driving simulators are useful tools not only to test the components of future cars but also to evaluate the telematics service and HMI (Human-Machine Interface). However driving simulators cannot be implemented to test and evaluate the telematics service system because the GPS (Global Positioning System) which contains basic functional support for the telematics module do not work in the VR (virtual reality) environment. This paper presents a method to implement telematics service to a driving simulator by developing the GPS simulator which is able to emulate GPS satellite signals consist of NMEA-0183 protocol and RS232C communication standards. It is expected that the driving simulator with the GPS simulator can be used to study HMI and human-factor evaluations of the commercial telematics system to realize the HiLES (Human-in-the-Loop Evaluation System).
Exhaust System Design for the Integrated Automotive Muffler
Jeong, Soo-Jin ; Kang, Woo ; Lee, Jeom-Joo ; Kim, Tae-Hun ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 24~31
This paper has been focused on the development of integrated automotive muffler system to meet getting more stringent sound quality target. Typically, muffler system consists of resonator and main muffler. The many varieties in exhaust pipe routing and the flexibility in muffler design make it possible to design an exhaust system to deliver tailpipe sound for specific sound quality requirement. In recent, it is strongly recommended that the function of resonator be merged into that of main muffler due to severe space limitation of underbody. The main objective of the paper is to study the effects of various geometrical parameters on the muffler performance. This work has succeeded in eliminating resonator without loss of muffler performance. This work has also investigated the effect of diameter of hole, geometries of pipes and location of muffler on the sound quality.
Effect of Thermal Stratification for Reducing Pressure Rise Rate in HCCI Combustion Based on Multi-zone Modeling
Kwon, O-Seok ; Lim, Ock-Taeck ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 32~39
The HCCI engine is a next generation engine, with high efficiency and low emissions. The engine may be an alternative to SI and DI engines; however, HCCI's operating range is limited by an excessive rate of pressure rise during combustion and the resulting engine knock in high-load. The purpose of this study was to gain a understanding of the effect of only initial temperature and thermal stratification for reducing the pressure-rise rate in HCCI combustion. And we confirmed characteristics of combustion, knocking and emissions. The engine was fueled with Di-Methyl Ether. The computations were conducted using both a single-zone model and a multi-zone model by CHEMKIN and modified SENKIN.
Development of the Virtual Test Technology for Evaluating Thermal Performance of Disc Brake
Choi, Bong-Keun ; Park, Jong-Hyun ; Kim, Mi-Ro ; Ahn, Byung-Jae ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 40~47
There are many kinds of simplifications and limitations in evaluating thermal performance of disc brake using the analytic technologies which were established before. But now new virtual test technology with several advanced analytic techniques is developed to evaluate the thermal performance without any possibility of great errors that used to happen for the time-consuming analysis. As a result, it was estimated that the virtual test technology could afford to replace the physical dynamo test since the reliability of virtual test technology was reasonably verified with the existing data measured in dynamo test.
Study on the Development of 340MPa Grade Super Formable High Strength Steel Sheets
Kim, Yong-Hee ; Lee, Young-Soo ; Lee, Oh-Yeon ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 48~54
The demand for formable high-strength steel (HSS) sheets has recently increased to reduce the weight of automotive bodies. The 340MPa (Tensile Strength) grade steel sheets are widely used for body inner and outer panels. Especially, super formable 340MPa grade steel sheets with high r-value have an excellent deep drawability compared with the other 340MPa grade steel sheets. It is very available for a part such as rear floor, center floor and dash panels used conventional mild steels up to now. We developed a super formable HSS by optimization of chemical composition, texture control and heat treatment control. It has good mechanical properties with excellent formability (tensile strength: 343MPa, elongation: 41.1% and
Emission Characteristics of Nano-sized Particles in Bio-ethanol Fuelled Engine with Different Injection Type
Lee, Jin-Wook ; Patel, Rishin ; Ladommatos, Nicos ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 55~62
As an experiment investigation, the effects of ethanol blended gasoline fuel with different injection method on nano-sized particle emission characteristics were examined in a 0.5L spark-ignited single-cylinder engine with a compression ratio of 10. Because this engine nano-particles are currently attracting interest due to its adverse health effects and their impact on the environments. So a pure gasoline and an ethanol blended gasoline fuels, namely E85 fuel, used for this study. And, as a particle measuring instrument, a fast-response particle spectrometer (DMS 500) with heated sample line was used for continuous measurement of the particle size and number distribution in the size range of 5 to 1000nm (aerodynamic diameter). As this research results, we found that the effect of ethanol blending gasoline caused drastic decrease of nano-particle emissions when port fuel injection was used for making better air-fuel mixture than direct fuel injection. Also injection timing, specially direct fuel injection, could be a dominant factor in controlling the exhaust particle emissions.
Analysis of Valvetrain Dynamics of an Internal Combustion Engine with Elastic Deformation of the Components
Lee, Ki-Su ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 63~71
The elastic effects of the valve train components are analyzed by using the finite element models of the rocker arm and valve. The whole equations of motion of the valvetrain of an internal combustion engine formulated by finite element techniques are solved by imposing the contact conditions with the augmented Lagrange multiplier method. The velocity and acceleration constraints as well as the displacement constraints are imposed on the contact points. The numerical simulations show that, even if the magnitude of the elastic deformation of the components is very small, it may have large effects on the valvetrain dynamics of a high-speed engine.
Effect of Fuels on
Emission in CVS-75 Mode
Kim, Yong-Tae ; Lee, Ho-Kil ; Kang, Jung-Ho ; Chung, Jae-Woo ; Chung, Yon-Jong ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 72~78
The regulation for
emissions from vehicles have become much more stringent in recent years. These more stringent regulations request vehicle manufacturers to develop alternative fuels to reduce exhaust emissions. In this paper,
emission of gasoline, diesel and LPG vehicles in the CVS-75mode is analyzed. The experimental results indicated that the cold starting acceleration period of
emission was much longer compared to the hot start acceleration period. For example, gasoline vehicle and LPG fuel vehicle had 21% higher
emission and diesel vehicle had 34% higher
Characteristics of Low Temperature Combustion in Single Cylinder Engine by High EGR Rate
Cho, Sang-Hyun ; Oh, Kwang-Chul ; Lee, Chun-Beom ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 79~85
Low temperature combustion regime for the simultaneous reduction of nitrogen oxides (
) and paticulate matter (PM) is demonstrated in single cylinder engine at various operating parameters, such as EGR rate, injection timing, EGR temperature, amount of fuel and swirl rate. Low temperature combustion is accomplished by high exhaust gas recirculation (EGR) rate in this study. Generally, the emission of
almost completely disappears and PM significantly increases in the first decreasing regime of oxygen concentration but after peaking about 10~12% oxygen concentration, PM then decreases regardless of fuel injection quantity. Low temperature combustion regime was extended by low EGR temperature, high injection pressure and low amount of fuel.
A Study on the Optimum Velocity of a Four Wheel Steering Autonomous Robot
Kim, Mi-Ok ; Lee, Jung-Han ; Yoo, Wan-Suk ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 86~92
A driver-vehicle model means the integrated dynamic model that is able to estimate the steering wheel angle from the driver's desired path based on the dynamic characteristics of the driver and vehicle. Autonomous driving robot for factory automation has individual four-wheels which are driven by electronic motors. In this paper, the dynamic characteristics of several four-wheel steering systems with the simultaneously steerable front and rear wheels are investigated and compared by means of the driver-vehicle model. A diver-vehicle model is proposed by using the PID control to velocity and trajectory of control autonomous driving robot. To determine the optimum speed of a autonomous driving robot, steady-state circle simulation is carried out with the ADAMS program and MATLAB control model.
Effect of Valve Lift and Timing on Internal Exhaust Gas Recirculation and Combustion in DME Homogeneous Charge Compression Ignition Engine
Jang, Jin-Young ; Bae, Choong-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 93~100
Intake/exhaust valve timing and exhaust cam lift were changed to control the internal exhaust gas recirculation (IEGR) and combustion phase of homogeneous charge compression ignition (HCCI) engine. To measure the IEGR rate, in-cylinder gas was sampled during from intake valve close to before ignition start. The lower exhaust cam made shorter valve event than higher exhaust cam and made IEGR increase because of trapping the exhaust gas. IEGR rate was more affected by exhaust valve timing than intake valve timing and increased as exhaust valve timing advanced. In-cylinder pressure was increased near top dead center due to early close of exhaust valve. Ignition timing was more affected by intake valve timing than exhaust valve timing in case of exhaust valve lift 8.4 mm, while ignition timing was affected by both intake and exhaust valve timing in case of exhaust valve 2.5 mm. Burn duration with exhaust valve lift 2.5 mm was longer than other case due to higher IEGR rate. The fuel conversion efficiency with higher exhaust valve lift was higher than that with lower exhaust valve lift. The late exhaust and intake maximum open point (MOP) made the fuel conversion efficiency improve.
Experimental Study on the TWSME Characteristics using Compressive Loading Cycles
Yoo, Young-Ik ; Kim, Hyun-Chul ; Lee, Jung-Ju ; Lee, Woo-Yong ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 101~107
Actuators using shape memory alloys use the one-way shape recovery stress. But when external load is applied the accumulated plastic strain induced by repeated deformation is the factor of generation of uncorrect recovery stress and unreliability. To solve this problem, two-way shape memory effect (TWSME) is considered. TWSME induced by plastic deformation have advantages including simple heating cycle without external force and enough recovery force for using actuators. but there is no research on cylinder-type or tube-type shape memory alloy actuators using two-way shape memory effect until now. Therefore in this study, characteristics of two-way shape memory effect is verified through the compression experiments using cylinder-type and tube-type specimens.
Rayleigh Method and Ritz Method
Park, Bo-Yong ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 108~117
Leissa claimed in his article that the Rayleigh method is not the same as the Ritz method for determining natural frequencies and its corresponding mode shapes and contended that Rayleigh's name should not be attached to the method. The present article examines the methods in viewpoint of admissible functions and its minimization process, and of the historical developments. It concludes that Leissa's assertion is relevant, although Rayleigh did apply a conceptual theory systematized from the Lagrange method, and given 38 years earlier than Ritz's 'masterly exposition of theory'.
High Strain Rate Compression Behavior of EPP Bumper Foams
Choi, Ki-Sang ; Kang, Woo-Jong ; Kim, Gi-Hoon ; Kim, Seong-Kun ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 118~125
Bumper is designed to protect the automotive frame without damage at low velocity. Expanded polypropylene (EPP) foam is used in the bumper as an energy absorbing material. In order to exactly predict the energy absorbing performance of the foam material under impact loading condition, it is important to use high strain rate material properties. In this study, a new apparatus for dynamic compression tests was developed to investigate the high strain rate behavior of EPP foams. Three kinds of EPP foams which have different expansion ratios were tested to investigate the quasi-static and dynamic compression behavior. Quasi-static compressions were performed at low strain rates of 0.001/s, 0.1/s and 1/s. The dynamic compressions were carried out at high strain rates of 50/s and 100/s with the developed apparatus. It was observed that the EPP foam has significant strain rate effect as compared to quasi-static behavior.
A Study of Dust Effect on Performance of Heat Exchangers with Louver and Wavy Fins
Lee, Young-Lim ; Hwang, Soon-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 126~132
Automotive heat exchangers use louver fins for their high efficiency. However, the efficiency can significantly drop for constructional vehicles or heavy equipments due to dust deposited on the louver fins with narrow slits. Thus it is necessary to develop new fins that lead to less fouling, so that a better performance can be achieved after exposure to a dusty environment over long period of time. New wavy fins were considered in the study and numerically analysed to compare with louver fins in the areas of air-side pressure drop, heat release rate, and particulate deposition. In addition, an experiment was done on the pressure drop and the particulate deposition. The results showed that the wavy fins would be a better choice for long-term use due to the excellent dust-proof performance in comparison to louver fins, in spite of the initial inferior performance of heat release.
Butane Working Capacity Evaluation of HC Adsorption Filter for Evaporative Gas to Satisfy PZEV Regulation
Kim, Deok-Jung ; Lee, Gee-Soo ; Kim, Hyun-Chul ; Heo, Hyung-Seok ; Na, Byung-Chul ; Choi, Seung-Bae ; Ra, Wan-Yong ; Cho, Yong-Seok ;
Transactions of the Korean Society of Automotive Engineers, volume 17, issue 4, 2009, Pages 133~138
The continued rise in the number of automobiles on the roads is prompting air pollution to emerge as a serious problem due to the harmful exhaust gas emissions throughout the world. Specifically, based on the exhaust gas regulation in North America represented by PZEV, the regulation on evaporative emission, which originates from the intake manifold system when the engine is stopped, is substantially being intensified. And the technology that can meet and satisfy these regulations has been needed. This study aimed to analyze and evaluate the butane working capacity (BWC) of HC adsorption filter according to the shape of it, which was developed to reduce evaporative emission, and the effect of HC adsorption filter on the engine performance. As a results, HC adsorption filter of the plate type, which was improved compared to that of the corrugated type and also became thinner, indicates higher absorption performance compared to the corrugated one. The absorption performance of the honeycomb type, derived from improving the shape of plate type, is 33.5% higher than that of the corrugated type. However, there was no significant difference in engine performance in all shapes.