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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 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
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Multi-body Dynamic Analysis for Tripod Constant Velocity Joint
Song, Myung-Eui ; Lim, Young-Hun ; Cho, Hui-Je ; Bae, Dae-Sung ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 1~7
The paper proposes a multi-body dynamic simulation to numerically evaluate the generated axial force(G.A.F) and plunging resistant force(P.R.F) practically related to the shudder and idling vibration of an automobile. A numerical analysis of two plunging types of CV joints, tripod joint(TJ) and very low axial tripod joint(VTJ), is conducted using the commercial program DAFUL. User-defined subroutines of a friction model illustrating the contacted parts of the outboard and inboard joint are subsequently developed to overcome the numerical instability and improve the solution performance. The Coulomb friction effect is applied to describe the contact models of the lubricated parts in the rolling and sliding mechanisms. The numerical results, in accordance with the joint articulation angle variation, are validated with experimentation. The offset between spider and tulip housing is demonstrated to be the critical role in producing the 3rd order component of the axial force that potentially causes the noise and vibration in vehicle. The VTJ shows an excellent behavior for the shudder when compared with TJ. In addition, a flexible nonlinear contact analysis coupled with rigid multi-body dynamics is also performed to show the dynamic strength characteristics of the rollers, housing, and spider.
An Experimental Study of Tire Safety & Economical Efficiency with Respect to Inflation Pressure
Hong, Seung-Jun ; Lee, Ho-Guen ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 8~13
Many vehicles have significantly under-inflated tires, primarily because drivers infrequently check their vehicles' tire pressure. When a tire is used while significantly under-inflated, its sidewalls flex more and the tire temperature increases, increasing stress and the risk of failure. In this study we evaluated tire safety and economical efficiency at various inflation pressure. For tire safety we performed FMVSS indoor durability test, measurement of rolling tire temperature, braking performance at dry/wet road condition, and rolling resistance test for economical efficiency. Results show that low pressure decreases tire durability of both speed-increase condition and load-increase condition. Heat temperature of rolling tire increases as pressure decreases and significantly under-inflated tires cause increase of vehicle's stopping distance at wet road condition. Also Under-inflation increases the rolling resistance of a tire and, correspondingly, decreases vehicle's fuel economy.
Development and Optimization of Engine Module for Hybrid System Simulator
Jeon, Dae-Il ; Gong, Ho-Jeong ; Hwang, In-Goo ; Myung, Cha-Lee ; Park, Sim-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 14~22
Hybrid Electronic Vehicle (HEV) is one of the solutions of high oil price and environment problem. Recently, study of HEV is important for automobile industry. However HEV has a lot of components and there are many cases for assembling, it's impossible to test results from assembling by using real vehicles. To solve this problem, hybrid system simulator is required. The purpose of this study is to develop and optimize of engine module for hybrid system simulator. The commercial 1-D engine simulation program, WAVE is used to get the engine capacity and performance data and 1-D simulation model of base engine is compared with engine experiment results. Using the data, the engine module is developed based on the MATLAB Simulink. There are blocks of base engine, Single-CVVT engine and Dual-CVVT engine. The effect of acceleration and deceleration is applied to each engine block. In addition, the control and processing logics for CIS technology are developed. Finally the simulator operates FTP-72 mode test.
The Performance and Emission Characteristics on Operating Condition for the SI Engine Fuel with Gasoline-Ethanol and Hydrogen Enriched Gas
Park, Cheol-Woong ; Kim, Chang-Gi ; Choi, Young ; Oh, Seung-Mook ; Lim, Gi-Hun ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 23~30
Trends of the automotive market require the application of new engine technologies, which allows for the use of different types of fuel. Since ethanol is a renewable source of energy and it contributes to lower
emissions, ethanol produced from biomass is expected to increase in use as an alternative fuel. It is recognized that for spark ignition (SI) engines ethanol has advantages of high octane number and high combustion speed. In spite of the advantages of ethanol, fuel supply system might be affected by fuel blends with ethanol like a wear and corrosion of electric fuel pumps. So the on-board hydrogen production out of ethanol reforming can be considered as an alternative plan. This paper investigates the influence of ethanol fuel on SI engine performance, thermal efficiency and emissions. The results obtained from experiments have shown that specific fuel consumption has increased by increasing ethanol amount in the blend whereas decreased by the use of hydrogen-enriched gas. The combustion characteristics with hydrogen-enriched gaseous fuel from ethanol reforming are also examined.
A Study on a Reliability Prognosis based on Censored Failure Data
Baek, Jae-Jin ; Rhie, Kwang-Won ; Meyna, Arno ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 31~36
Collecting all failures during life cycle of vehicle is not easy way because its life cycle is normally over 10 years. Warranty period can help gathering failures data because most customers try to repair its failures during warranty period even though small failures. This warranty data, which means failures during warranty period, can be a good resource to predict initial reliability and permanence reliability. However uncertainty regarding reliability prediction remains because this data is censored. University of Wuppertal and major auto supplier developed the reliability prognosis model considering censored data and this model introduce to predict reliability estimate further "failure candidate". This paper predicts reliability of telecommunications system in vehicle using the model and describes data structure for reliability prediction.
Effect of Air-fuel Ratio on Combustion and Emission Characteristics in a Spark Ignition Engine Fueled with Bio-ethanol
Kim, Dae-Sung ; Yoon, Seung-Hyun ; Lee, Chang-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 37~43
The purpose of this paper is to investigate the effect of air-fuel ratio on the combustion and emissions characteristics of spark ignition (SI) gasoline engine fueled with bio-ethanol. A 1.6L SI engine with 4 cylinders was tested on EC dynamometer. In addition, lambda sensor and lambda meter were connected with universal ECU to control the lambda value which is varied from 0.7 to 1.3. The engine performance and combustion characteristics of bio-ethanol fuel were compared to those obtained by pure gasoline. Furthermore, the exhaust emissions such as carbon monoxide (CO), unburned hydrocarbon (HC), oxides of nitrogen (
) and carbon dioxide (
) were measured by emission analyzers. The results showed that the brake torque and cylinder pressure of bio-ethanol fuel were slightly higher than those of gasoline fuel. Brake specific fuel consumption (BSFC) of bio-ethanol was increased while brake specific energy consumption (BSEC) was decreased. The exhaust emissions of bio-ethanol fuel were lower than those of gasoline fuel under overall experimental conditions. However, the specific emission characteristics of the engine with bio-ethanol fuel were influenced by air-fuel ratio.
Durability Performance Evaluation of an Aluminum Knuckle using Virtual Testing Method
Ko, Han-Young ; Choi, Gyoo-Jae ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 44~50
Durability performance evaluation technology using Virtual Testing Method is a new concept of a vehicle design, which can reduce the automotive components design period and cost. In this paper, the fatigue life of an aluminum knuckle of a passenger car is evaluated using virtual testing method. The flexible multibody dynamic model of a front half car module is generated and solved with service loads which are measured from Belgian roads. Using a multibody dynamic analysis software, the flexible multibody dynamic simulation of a half car model is carried out and the dynamic stress profile of an aluminum knuckle is acquired. The stress profile is exported to a fatigue analysis software and durability performance of an aluminum knuckle is evaluated.
Comparison Head-Neck Movement and Neck Injury Criteria of BiRIDII in Rear-impact Sled Test
Kim, Si-Woo ; Shim, So-Jung ; Suh, Myung-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 51~57
In recent years, a large number of study for rear impact has been conducted and as a result of study, researchers proposed the neck injury criteria and test procedures. But many questions, related to injury criteria and dummy biomechanical levels, remain unresolved. In recently reports, rear impact motions of BioRIDIIg is not humanlike but better than other dummy(HybridIII, RID3d). So, in this paper, 4 times sled test would be done to find the substitutable neck injury criteria in BioRIDIIg. To review corelation trend with neck injury critera and head-neck movement, we compared with recently announced neck injury criteria(NIC, Nkm, T1 ect.) and head-neck X-direction movement in BioRIDIIg. Finally, we find the head-neck X-direction movement on head C.G to T1 point may be considerable as the additional neck injury criteria.
An Analysis of Dent Formation by Dynamic Finite Element Method
Cha, Sung-Hoon ; Shin, Myoung-Soo ; Kim, Jong-Bong ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 58~65
For the improvement of fuel consumption, the study on the use of lightweight material or thinner sheet have been carried out in automotive industry. With the need for the use of thinner sheet, the dent resistance became one of the major concern in th design of exterior panels in automotive industry. Many studies have been carried out for the dent resistance by experiment or quasi-static numerical simulation. In this study, the dent formation behavior is investigated by dynamic finite element analysis using ABAQUS. Dent formation may be affected by many factors such as sheet thickness, material properties, pre-strain, and sheet curvature. The effect of these factors on dent resistance is investigated. From the analysis following three conclusions are derived. First, dent resistance become hard as the sheet curvature radius increases. Second, dynamic dent resistance is mainly affected by bending stress rather than tensile stress. Third, the pre-strain itself do not give any guidance for dynamic dent resistance and dynamic dent resistance have to be decided considering the strain hardening and thickness reduction together. The results are considered to be reliable and useful to improve the dent damage of automotive panels.
Study on the Material Parameter Extraction of the Overlay Model for the Low Cycle Fatigue(LCF) Analysis
Kim, Sang-Ho ; Kabir, S.M. Humayun ; Yeo, Tae-In ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 66~73
This work was focused on the material parameter extraction for the isothermal cyclic deformation analysis for which Chaboche(Combined Nonlinear Isotropic and Kinematic Hardening) and Overlay(Multi Linear Hardening) models are normally used. In this study all the parameters were driven especially based on Overlay theories. A simple method is suggested to find out best material parameters for the cyclic deformation analysis prior to the isothermal LCF(Low Cycle Fatigue) analysis. The parameter extraction was done using 400 series stainless steel data which were published in the reference papers. For simple and quick review of the parameters extracted by suggested method, 1D FORTRAN program was developed, and this program could reduce the time for checking the material data tremendously. For the application to FE code ABAQUS user subroutine for the material models was developed by means of UMAT(User Material Subroutine), and the stabilized hysteresis loops obtained by the numerical analysis were in good harmony with test results.
A Study of the Optimization of the Compounded PP Using the DOE
Park, Sung-Ho ; Lim, Dong-Cheol ; Kim, Ki-Sung ; Bae, Jong-Rak ; Jeon, Oh-Hwan ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 74~85
In order to formulate the compounded polypropylene(C-PP) which is suitable to an automotive door trim panel, 9 sorts of properties were measured after manufacturing the C-PP using an extruder and an injection machine with polypropylene(PP), ethylene-octene rubber(EOR) and talc. Mixture design, especially extreme vertices design, in DOE with MINITAB - commercial software was used to analyze the data. The relations between each property and each component, for example,
for specific gravity, were found out by the regression analysis and the variance analysis. The optimized formulation of the C-PP for an automotive door trim panel was acquired at PP(77.6962), EOR(11.0238) and talc(10.2800) by use of the response optimizer(mixture) in MINITAB.
An Experimental Study on Reduction of
Exhausted Emission by using Fuel-cut Function of Vehicles
Ko, Kwang-Ho ; Jeong, Seung-Hyun ; Yoo, In-Kyoon ; Lee, Soo-Hyung ; Kim, Je-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 86~92
The fuel is not injected when the driver doesn't push acceleration pedal of a vehicle with engine speed higher than about 1,500rpm above mid vehicle speed range. This is called "fuel-cut function" and almost every modern vehicle is equipped with this function. This is activated on downhill part of a highway most often. Therefore the vehicle-exhausted
can be zero in this downhill part if the driver could recognize this part of highway. We compared the vehicle-exhausted
emission when using fuel-cut function with the
mass when without using this function in this study. We found that the
emission reduced with fuel-cut function and measured the reduction rate of vehicle-exhausted
mass with this test results. The exhausted
mass of a passenger car(2,000cc engine volume) is reduced by 4% with this function used. This
reduction effect can be achieved if the downhill part of a highway is painted with a specific color. And this road painting can be included in the highway road rehabilitation policy.
An Experimental Study on Characteristics of Temperature Separation in a Vortex Tube for Diesel Engine Exhaust Gas
Jung, Young-Chul ; Choi, Doo-Seuk ; Im, Seok-Yeon ; Kim, Hong-Ju ; Ryu, Jeong-In ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 93~98
An object of this study is to confirm the opening amount of the throttle valve that is begun the temperature separation of vortex tube for various engine speed and load condition in a common rail diesel engine. The vortex tube located at downstream of the exhaust manifold is a device separating the incoming exhaust gas to hot and cold stream. To find optimum separation efficiency of vortex tube, the opening amount of throttle valve has been investigated for various engine speed and load conditions. Engine speed was found that the influence of engine speed was dominant compared with that of engine load. As engine speed was increased, the throttle opening amount starting temperature separation was reduced.
The Effect of Bumper Mismatch on Vehicle Repair Cost
Choi, Dong-Won ; Park, In-Song ; Hong, Seung-Jun ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 99~104
It is a frequent occurrence in urban traffic - a low-speed collision in which one vehicle hits the back of another. The vehicles often sustain expensive damage. Bumpers can reduce this damage, but only line up so the initial contact in an impact is bumper to bumper. Then the bumpers on the colliding vehicles have to absorb the crash energy, keeping damage away from expensive sheet metal, lights, and other components. In real world accidents, Bumper mismatches in crashes are increasing, and the resulting repair costs from low-speed collisions are escalating. In this study, we investigated the bumper rail height and analyzed their effects on repair cost. Futhermore, Our 16kph front-into-rear crash tests demonstrates bumper mismatch problem.
Analysis of Equal Sensation Curves for the Korean People about Vertical Whole-Body Vibration
Kim, Kun-Woo ; Kim, Min-Seok ; Yoo, Wan-Suk ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 105~111
In the field of 'Human Vibration', it has been interested subjects to make equal sensation curves related to translational and rotational direction of whole-body, hand-transmitted and head-transmitted vibration, etc. When we consider the vibration of a vehicle, the main factor is vertical whole-body vibration. Until now, most of equal sensation curves used to derive frequency weighting function had been made using Western people. However, because of the inherent differences (for example, characteristic and shape of body parts, muscular and cellular tissue) between the Western people and the Oriental people, equal sensation curves based on Oriental people might be required. Also, the weight differences between the samples which consist of average-weighted and over-weighted group might cause the difference of equal sensation curves. So, in this study, 20 male Korean people were used to find equal sensation curves subject to vertical whole-body vibration on seated posture. Among 20 males, an over weighted group consisted of 10 male persons and an average weighted group was the others. Integrating and analyzing the data of two groups, some of non-parametric tests such as 'The Wilcoxon Signed Rank Test' and 'The Mann Whitney U test' were used.
Effect of DLC Coating-layer on Engine Wear Characteristics for Improving Fuel Consumption of Automotive Engine
Kim, Kee-Joo ; Yoo, Seok-Jong ; Choi, Byung-Ik ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 112~119
Recently, as the matters of environmental pollution, the energy exhaustion and alternative energy source have become more important issues, around industrial countries and the effort to improve fuel consumption is progressed continuously for decrease of air pollution. In an effort to improve fuel consumption for passenger cars, the study of DLC (Diamond Like Carbon) coating which is widely known to good wear characteristics come to the forefront. Therefore, in present study, it was investigated to the influence of DLC coating layer for wear characteristics with the piston ring material and then suggested to the development process for advanced automotive engine parts that showed improved wear characteristics. From these results, Finally, it will be contributed to improve the fuel consumption for passenger vehicles.
Mechanical Properties of Hyper-Eutectic Aluminum Alloys for Automobile Parts
Bae, Chul-Hong ; Kim, Jong-Myung ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 120~126
It was known that the excellent wear resistance of hyper eutectic aluminum alloy is based on the primary Si particles which are distributed in the base metal. When the primary Si volume fraction increases, the smaller size have excellent wear resistance characteristics. However, this trend always does not match. There is no investigation result based on the materials and methods for real using parts. In this study, using the automotive parts manufacturer currently in use hyper eutectic Al alloy tensile test specimen type sample was fabricated by 350Ton high pressure die-casting machine. Then, fluidity, tensile, impact and wear resistance properties were evaluated. If the casting quality, primary Si size, fraction and distribution are similar, mechanical properties and wear resistance are equivalent.
Forming Limit Diagram of DP590 considering the Strain Rate
Kim, Seok-Bong ; Ahn, Kwang-Hyun ; Ha, Ji-Woong ; Lee, Chang-Soo ; Huh, Hoon ; Bok, Hyun-Ho ; Moon, Man-Been ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 127~130
This paper deals with the formability of DP590 steel considering the strain rate. The strain hardening coefficient, elongation and r-value were obtained from the static and dynamic tensile test. As strain rate increases from static to 100/s, the strain hardening coefficient and the uniform elongation decrease and the elongation at fracture and r-value decrease to 0.1/s and increase again to 100/s. The high speed forming limit tests with hemi-spherical punch were carried out using the high speed crash testing machine and high speed forming jig. The high speed forming limit of DP590(order of
/s) decreases compared to the static forming limit(order of
/s) and the forming limit band in high speed forming test is narrower than that in the static forming test. This tendency may be due to the development of brittleness with increase of stain rate.
Study on Transient Analysis for Flow Characteristics in DPF
Shin, Dong-Won ; Yoon, Cheon-Seog ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 131~138
Because real flow of engine exhaust is very hot and highly transient, it may cause thermal and inertial loads on catalyzed filters in DPF. Transient and detailed flow and thermal simulations are necessary in this field. To assess the importance of time dependent phenomena, typical cone-type configuration such as an underbody DPF is selected for steady and transient analysis. User defined functions of FLUENT by sinusoidal inlet velocities are written and integrated with main solver for realistic simulation. Also, 4-cylinder and 6-cylinder engines for 3,000 L class are considered for the dynamic exhaust effect of engine type. Key parameters to understanding of catalyst performance and durability issues such as flow uniformity index and peak velocity are investigated. Also, pressure drop for engine power are considered. From the simulation results for three different cases, proper approach is recommended.
Life Prediction of Automotive Vehicle's W/H System Using Finite Element Analysis
Kim, Byeong-Sam ; Kang, Ki-Jun ; Park, Kyoung-Woo ; Noh, Kwang-Doo ;
Transactions of the Korean Society of Automotive Engineers, volume 18, issue 1, 2010, Pages 139~144
In the automotive electronic industry, the development of vehicle's door wiring harness (W/H) system for new applications is driven continuously for the low-cost and the high strength performance for electronic components. The problem of the fatigue strength estimation for materials and components containing natural defects, inclusions, or inhomogeneities is of great importance both scientifically and industrially. This article gives some insight into the dimensioning process with special focus on the fatigue analysis of wiring harness (W/H) in vehicle's door structures. The results from endurance tests using slim test specimens were compared with the results from FEM for predicted fatigue life. The expectation for the life of components is affected by the microstructural features with complex stress state arising from the combined service loading and residual stresses.