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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 24, Issue 5 - Sep 2016
Volume 24, Issue 4 - Jul 2016
Volume 24, Issue 3 - May 2016
Volume 24, Issue 2 - Mar 2016
Volume 24, Issue 1 - Jan 2016
Selecting the target year
Optimization of an Automotive Disc Brake Cross-section with Least Thermal Deformation by Taguchi Method
Kim, Cheol ; Ha, Tae-jun ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 1~9
DOI : 10.7467/KSAE.2016.24.1.001
Optimum cross-sectional shape of an automotive disc brake was developed based on FEM thermal analyses and the Taguchi method. Frictional heat flux and convection heat transfer coefficients were first calculated using equations and applied to the disc to calculate accurate temperature distribution and thermal deformations under realistic braking conditions. Maximum stress was generated in an area with highest temperature under pads and near the hat of ventilated disc and vanes. The SN ratio from Taguchi method and MINITAB was applied to obtain the optimum cross-sectional design of a disc brake on the basis of thermal deformations. The optimum cross-section of a disc can reduce thermal deformation by 15.2 % compared to the initial design.
Structural Analysis of Pump Gear of Urea-SCR System for Diesel Engine
Lee, Hongyoon ; Park, Chungyeol ; Kim, Hyungmin ; Kim, Sejin ; Choi, Dooseuk ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 10~15
DOI : 10.7467/KSAE.2016.24.1.010
This research was conducted structural analysis in order to analyze the impact of the gear in Urea pump when the water is frozen. Subject of study, gear was designed nine models, this gear is a spur gear, located in pump. Contact conditions and rotation conditions were set the gear's condition of restriction. Given 136 MPa pressure to external gear by water was set to the applied stress. The performing result of structural analysis, maximum stress and strain are appeared between two gears. At the same diameter, strain and stress are decreased gradually thicker. Because of the little part in crevice between gears, this parts of gears could be obtained conclusion to be generated maximum stress and strain.
A Study on the Clamping Force Estimation and Failsafe Control Algorithm Design of the Electronic Wedge Brake System
Chung, Seunghwan ; Lee, Hyeongcheol ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 16~23
DOI : 10.7467/KSAE.2016.24.1.016
The EWB(electronic wedge brake) is one in which the braking force is developed in a wedge and caliper system and applied to a disk and wedge mechanism. The advantage of the wedge structure is that it produces self-reinforcing effect and hence, utilizes minimal motor power, resulting in reduced gear and current. The extent of use of clamping force sensors and protection from failure of the EWB system directly depends on the level of vehicle mass production. This study investigated the mathematical equations, simulation modeling, and failsafe control algorithm for the clamping force sensor of the EWB and validated the simulations. As this EWB system modeling can be applied to motor inductance, resistance, screw inertia, stiffness, and wedge mass and angle, this study could improve the accuracy of simulation of the EWB. The simulation results demonstrated the braking force, motor speed, and current of the EWB system when the driver desired to the step and pulse the brake force inputs. Moreover, this paper demonstrated that the proposed failsafe control algorithm accurately detects faults in the clamping force sensor, if any.
Pedestrian Protection System Design for SUV Using the Design of Experiments
Lee, Youngmyung ; Choe, Wonseok ; Park, Gyung-Jin ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 24~32
DOI : 10.7467/KSAE.2016.24.1.024
The mortality rate of car-pedestrian accidents is quite high, compared to the frequency of accidents. Researches on pedestrian protection are being actively performed worldwide. The A-pillar and lower part of the wind shield cause the most serious damage to the pedestrians. Typical devises to protect the pedestrians are the hood lift system and pedestrian airbag. The design of such devices for an sport utility vehicle is performed based on a design process using design of experiments (DOE). The design results are obtained by an orthogonal array (OA), analysis of mean (ANOM) and analysis of variance (ANOVA). A metamodel is also used in the design process.
Measurement of Inertia of Turbocharger Rotor in a Passenger Vehicle
Chung, Jin Eun ; Lee, Sangwoon ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 33~38
DOI : 10.7467/KSAE.2016.24.1.033
The turbocharger is an essential component to realize the engine down-sizing. The moment of inertia of turbocharger rotor is an important parameter with respect to acceleration performance of the vehicle. It can be calculated from the CAD software based the geometry data and the material properties. But the accurate value of the inertia of turbocharger rotor must be measured through the experimental method. In this study, the measurement of moment of inertia of turbocharger rotor for 2.0 L spark-ignition engine was carried out. First, an experimental equipment using a trifilar method was designed and fabricated. Some optical devices, that is, photo sensor, counter, convex lens, etc, were used to increase the accuracy of the measurement. Second, error sensitivity for the equipment was analyzed. The error of period time and the radius can give big affects to the accuracy of the moment of inertia. When the amount of error of these two were each 1.0 %, maximum error of the moment of inertia was under 3.0 %. Third, the calibration for the equipment was performed using a calibration rotor which has similar shape to turbine rotor but simple. Calculated value from CAD software and measured one for the calibration rotor were compared. The total error of the equipment and the measurement is about 1.3 %. This result shows that the equipment can give the good result with resonable accuracy. Finally the moment of inertia of the turbine rotor and compressor wheel were measured. The coefficient of variations, the ratio of standard deviation to mean value, were reasonably small at 0.57 % and 0.73 % respectively. Therefore this equipment is suitable for the measurement of the moment of inertia of the turbine rotor and compressor wheel.
Developing Analysis Model for Evaluation of HCVT Materialization Possibility, and Examining It's Characteristics
Noh, Daekyung ; Jung, Dongsoo ; Jang, Joosup ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 39~46
DOI : 10.7467/KSAE.2016.24.1.039
This paper reviews design validity before manufacturing HCVT prototype through simulation. The component part is being devided, modeled and checked if it works well to an designer's original intent about some active modes. Also, the dynamic characteristic is examined how it changes according to alteration of pressure, friction and leak rate. Finally, HCVT design plan is being confirmed if it could be materialized through those analysis.
Evaluation on a Miller Cam for Improving the Fuel Consumption of a Large Diesel Engine
Song, Changhoon ; Wang, Tae Joong ; Im, Heejun ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 47~52
DOI : 10.7467/KSAE.2016.24.1.047
Miller timing is one of the promising ways which can improve the fuel consumption of internal combustion engines. Indeed, Miller timing employing an early intake valve close is widely applied to large diesel and gas engines to enhance performance and reduce NOx emissions. In this study, performance evaluation is carried out by 1-D cycle simulation in order to estimate the effect of Miller CAM timing before BDC for a 32 L turbocharged diesel engine. To optimize Miller CAM timing, a single stage turbocharger is matched with an early intake valve close since boost pressure is a significant parameter that can control compression work in a turbocharged engine. The engine simulation result shows that there is enough potential to improve fuel consumption rate and also reduce NOx emissions at the same time.Abstract here.
Modeling of Engine Coolant Temperature in Diesel Engines for the Series Hybrid Powertrain System
Kim, Yongrae ; Lee, Yonggyu ; Jeong, Soonkyu ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 53~58
DOI : 10.7467/KSAE.2016.24.1.053
Modeling of engine coolant temperature was conducted for a series hybrid powertrain system. The purpose of this modeling was a simplification of complex heat transfer process inside a engine cooling system in order to apply it to the vehicle powertrain simulation software. A basic modeling concept is based on the energy conservation equation within engine coolant circuit and are composed of heat rejection from engine to coolant, convection heat transfer from an engine surface and a radiator to ambient air. At the final stage, the coolant temperature was summarized as a simple differential equation. Unknown heat transfer coefficients and heat rejection term were defined by theoretical and experimental methods. The calculation result from this modeling showed a reasonable prediction by comparison with the experimental data.
Review on Subjective and Objective Assessments of Ride Comfort, Handling and Steering Feeling
Kim, Hyungjun ; Han, Jihyuck ; Yang, Ji Hyun ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 59~66
DOI : 10.7467/KSAE.2016.24.1.059
The evaluations of ride comfort, handling, and steering feeling have been known as one of the dominant factors for vehicle performance assessment. However, those factors have not been analyzed in-depth in conjunction with general ride and handling design parameters. Thus, we have surveyed some previous studies dealing with subjective parameters and quantitative design parameters. We expect this paper provides some guidance to the future research on the field.
A Study on Wear Characteristics of Cutting Tools in a Titanium Roughing Cut Machining
Bae, Myung-whan ; Jung, Hwa ; Park, Hyeong-yeol ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 67~73
DOI : 10.7467/KSAE.2016.24.1.067
The application of titanium has been gradually rising because the utilizing ranges for low weight and high strength are rapidly increased by the need for improving the fuel economy in production industries such as the aviation and automotive in recent. The purpose in this study is to investigate the appropriate cutting conditions on the life of flat and round end mills by measuring the maximum cutting temperature relative to the machining time, and calculating the wear rates of cutting tool with the spindle speed and feed rate of vertical machining center as a parameter in the titanium roughing cut machining which is widely used in critical parts of aircraft, cars, etc. When the wetted roughing cut machining of titanium with a soluble cutting oil is conducted by the flat and round end mills, the maximum cutting temperatures for a variety of spindle speed and feed rate are measured at ten-minute intervals during 60 minutes by an infrared thermometer, and the wear rates of cutting tool are calculated by the weight ratios based on tool wear before and after the experiment. It is found that the maximum cutting temperature and the wear rates of cutting tool are raised as the cutting amount per tool edge is increased with the rise of feed rate, in this experimental range, and as the frictional area due to the rise of contacting friction numbers between tool and specimen is increased with the rises of cutting time and spindle speed. In addition, the increasing rate of maximum cutting temperature in the flat and round end mills are the highest for the cutting time from 50 to 60 minutes, and the wear rate of cutting tool in the flat end mill is 1.14 to 1.55 times higher than that in the round end mill for all experimental conditions.
Turbine Design for Turbo-compound System to Recover Exhaust Gas Energy Using 1-D Mean Line Flow Model
Jang, Jinyoung ; Yun, Jeong-Eui ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 74~81
DOI : 10.7467/KSAE.2016.24.1.074
The aim of this study was to find the initial design value of turbine blade for electrical type turbocompound system generating 10 kW. Turbocompound is one of the waste heat recovery system applying to internal combustion engine to recover exhaust gas energy that was about 30 % of total input energy. To design the turbine blade, 1-D mean line flow model was used. Exhaust gas temperature, pressure, flow rate and turbine rotating speed was fixed as primary boundary conditions. The velocity triangles was defined and used to determine the rotor inlet radius and width, the rotor outlet radius at shroud and radius at hub, the rotor flow angles and the number of blades.
Numerical Study on Human Thermal Comfort in a Passenger Train
Kim, Man-Hoe ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 82~89
DOI : 10.7467/KSAE.2016.24.1.082
This paper presents computational fluid dynamics (CFD) analysis on passenger thermal comfort in a train. Human thermal comfort in vehicles depends mainly on air temperature, mean radiant temperature, air velocity, humidity, and direct solar flux, as well as the level of activity and thermal properties of clothing and seat. The velocity and temperature distribution in a train with and without passengers are reported. The thermal comfort in a passenger train are also presented based on PMV and PPD indices with 16 segments of the human body.
The Optimization Study on the Test Method of Remanufactured Power Steering Oil Pump by Using FMEA
Seo, Youngkyo ; Jung, Dohyun ; Yu, Sangseok ; Rha, Wanyong ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 90~98
DOI : 10.7467/KSAE.2016.24.1.090
Currently government certified test method for an automobile remanufactured products is insufficient. Thus many automotive parts in the remanufacturing market are lacking proper evaluation criteria and production of defective products are causing customer dissatisfaction. In this paper a power steering oil pump, which requires stringent manufacturing standards, is studied by the failure mode and effect analysis approach. The research suggested that the test criteria such as discharge flow characteristic test, tightness test, pulley run-out test, pressure switch operation test, low temperature test and rotation pressure durability test should be performed to evaluate the reliability of remanufactured power steering oil pumps. As a result of tests, the performance of remanufactured power steering oil pump satisfied the evaluation criteria of pressure switch operation test and low temperature test. However, the remanufactured power steering oil pump failed to satisfy the evaluation criteria on discharge performance test, tightness test and pulley run-out test. These performance evaluation tests proved the necessity of standard process for the remanufactured power steering oil pump.
Integrated Fault Diagnosis Algorithm for Driving Motor of In-wheel Independent Drive Electric Vehicle
Jeon, Namju ; Lee, Hyeongcheol ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 99~111
DOI : 10.7467/KSAE.2016.24.1.099
This paper presents an integrated fault diagnosis algorithm for driving motor of In-wheel independent drive electric vehicle. Especially, this paper proposes a method that integrated the high level fault diagnosis and the low level fault diagnosis in order to improve a robustness and performance of the fault diagnosis system. The high level fault diagnosis is performed using the vehicle dynamics analysis and the low level fault diagnosis is carried using the motor system analysis. The validity of the high level fault diagnosis algorithms was verified through
cosimulation and the low level fault diagnosis's validity was shown by applying it to a MATLAB/
interior permanent magnet synchronous motor control system. Finally, this paper presents a fault diagnosis strategy by combining the high level fault diagnosis and the low level fault diagnosis.
Safe Adaptive Headlight Controller with Symmetric Angle Sensor Compensator Using Steering-swivel Angle Lookup Table
Youn, Jiae ; An, Joonghyun ; Yin, Meng Di ; Cho, Jeonghun ; Park, Daejin ;
Transactions of the Korean Society of Automotive Engineers, volume 24, issue 1, 2016, Pages 112~121
DOI : 10.7467/KSAE.2016.24.1.112
AFLS (Adaptive front lighting system) is being applied to improve safety in driving automotive at night. Safe embedded system design for controlling head-lamps is required to improve noise robust ECU hardware and software simultaneously by considering safety requirement of hardware-dependent software under severe environmental noise. In this paper, we propose an adaptive headlight controller with a newly-designed symmetric angle sensor compensator, especially based on the proposed steering-swivel angle lookup table to determine whether the current controlling target is safe. The proposed system includes an additional backup hardware to compare the system status and provides safe swivel-angle management using a controlling algorithm based on the pre-defined lookup table (LUT), which is a symmetric mapping relationship between the requested steering angle and expected swivel angle target. The implemented system model shows that the proposed architecture effectively detects abnormal situations and restores safe status of controlling the light-angle in AFLS operations under severe noisy environment.