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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
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Volume & Issues
Volume 22, Issue 7 - Nov 2014
Volume 22, Issue 6 - Sep 2014
Volume 22, Issue 5 - Jul 2014
Volume 22, Issue 4 - May 2014
Volume 22, Issue 3 - Apr 2014
Volume 22, Issue 2 - Mar 2014
Volume 22, Issue 1 - Jan 2014
Selecting the target year
Optimization of Passenger Safety Restraint System for USNCAP by Response Surface Methodology
Oh, Eun-Kyung ; Lee, Ki-Sun ; Son, Chang-Kyu ; Kim, Dong-Seok ; Chae, Soo-Won ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 1~8
DOI : 10.7467/KSAE.2014.22.6.001
Safety performance of a new car is evaluated through USNCAP and their results in the star rating are provided to the consumers. It is very important to obtain high score of USNCAP to appeal their performance to consumers. Therefore the car companies have made the effort to improve their car safety performance. These efforts should satisfy the demand not only to get high score but also to pass the FMVSS, NHTSA regulations on safety. Huge numbers of car crash tests have been conducted on these bases by car companies. However physical tests spend too much cost and time, as an alternative way, the simulation on the car crash could be a solution to reduce the cost and time. Therefore the simulations have been widely conducted in car industry and various researches on this have been reported. In this study, restraint system had been optimized to minimize the injury of female passenger. Belted
female frontal crash test was selected from various test methods of USNCAP for the study. Initial velocity of the test was 56km/h. The combination injury probability of USNCAP was selected as an objective function and the injury limit value, which was defined in FMVSS, was set to an optimization constraint. Many researches that were similar to this study had been conducted, however most of them had limitation that interaction between airbag and safety belt had not been considered. Contrary to these researches, the interaction was considered in this study.
Study of the Mechanical Properties of GFRTP by Pressure Additives and Compounding
Oh, Seung Min ; Kim, Jong Su ; Seol, Gyun Ho ; Yun, Ye Ji ; Kim, Young Min ; Yang, Dong Su ; No, Su Jin ; Lee, Gyu Se ; Gang, Sung Su ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 9~13
DOI : 10.7467/KSAE.2014.22.6.009
Glass fiber reinforced thermoplastics(GFRTP) is made by adding chemical additive to glass fabric which is strong at a high temperate, incorrodible, and good at intensity and specific gravity. Although we focused on the weight lightening, the intensity of GFRTP is also important. To remedy thermoplastic resin's inferior property of matter to thermo-hardening resin, we formed several specimen, differing the chemical additive as Homo PP, MAPP 3%, Rubber 5%, and mixed. We put pressure of 5 type on the specimens. The analyses result for the different pressure, the resin spreads evenly, then the coherence is increased. Eventually, the mechanical properties are changed. When high intensity is needed, it is good idea to use polypropylene(PP) which has good coherence with glass fabric as chemical additive. We can get better intensity when we form the resin at the optimum pressure depending on mixing of chemical additive and glass fabric than when we increase the pressure.
Map Building Based on Sensor Fusion for Autonomous Vehicle
Kang, Minsung ; Hur, Soojung ; Park, Ikhyun ; Park, Yongwan ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 14~22
DOI : 10.7467/KSAE.2014.22.6.014
An autonomous vehicle requires a technology of generating maps by recognizing surrounding environment. The recognition of the vehicle's environment can be achieved by using distance information from a 2D laser scanner and color information from a camera. Such sensor information is used to generate 2D or 3D maps. A 2D map is used mostly for generating routs, because it contains information only about a section. In contrast, a 3D map involves height values also, and therefore can be used not only for generating routs but also for finding out vehicle accessible space. Nevertheless, an autonomous vehicle using 3D maps has difficulty in recognizing environment in real time. Accordingly, this paper proposes the technology for generating 2D maps that guarantee real-time recognition. The proposed technology uses only the color information obtained by removing height values from 3D maps generated based on the fusion of 2D laser scanner and camera data.
Dead Time Compensation and Polarity Check of Phase Currents Based on Programmable Low-pass Filter for Automotive Electric Drive Systems
Choi, Chinchul ; Lee, Kangseok ; Lee, Wootaik ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 23~30
DOI : 10.7467/KSAE.2014.22.6.023
This paper proposes a dead time compensation method for an AC motor drive using phase current polarity information which is detected based on a digital programmable low-pass filter (PLPF). The polarity detection using the PLPF is an alternative solution of a conventional method which uses a general low-pass filter (LPF) and hysteresis bands in order to avoid jittering due to noises. The PLPF not only adjusts its cutoff frequency according to the synchronous frequency of AC motors but also eliminates a gain attenuation and phase delay which are main problems of the general LPF. Through the PLPF, a fundamental component signal without gain and phase distortions is extracted from the measured raw current signal with noise. By use of the fundamental component, the polarity of current is effectively detected by reducing the hysteresis band. Finally, the proposed method compensates the dead time effects by adding or subtracting average voltage value to voltage references of the controller according to the detected current polarity information. The proposed compensation method is experimentally verified by compared with the conventional method.
A Study on the Appropriateness of Virtual Machine for Reverse Engineering
Oh, Seokhyung ; Chang, Byoungchun ; Ro, Yunsik ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 31~38
DOI : 10.7467/KSAE.2014.22.6.031
The purpose of this study is to make virtual machine using a 3D modeller to perform reverse engineering. Through the intuitive designer's ability, approximated model of the object is created and used to extract the data and NC tool path. The extracted data make approximated curve by using NURBS curve fitting. And the curve is used to remodel. From these series of process, the final reverse engineering data of the objects can be obtained. Two conclusions are drawn from this study. First, initial deviation of the intuitive model is one of the important factors that determine the number of repetitions of the experiment. Due to the characteristic of intuitive curve, after a certain number of repetitions the average deviation increase and radiate rather than decrease.
A Study on the Dynamic Behavior of a 2-step Variable Valve Switching System for Automotive Engines
Kim, Dongil ; Kim, Dojoong ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 39~48
DOI : 10.7467/KSAE.2014.22.6.039
Variable valve actuation system is one of the widely used techniques to improve the fuel efficiency and power of automotive engines. 2-step variable valve actuation systems are also paid attention for the application to direct acting type valve train systems. Besides its advantages in size, weight, relatively simple structure, ets, however, 2-step variable valve actuation system has inherent disadvantages in dynamic instability of switching system to alter discontinuous lift modes. In this study, both experimental and analytical studies are performed to understand the dynamic behavior of a switching mechanism of a 2-step variable valve actuation system, and present a design method to improve its dynamic instability.
Assessment and Reliability Validation of Lane Departure Assistance System Based on DGPS-GIS Using Camera Vision
Moon, Sangchan ; Lee, Soon-Geul ; Kim, Minwoo ; Joo, Dani ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 49~58
DOI : 10.7467/KSAE.2014.22.6.049
This paper proposes a new assessment and reliability validation method of Lane Departure Assistance System based on DGPS-GIS by measuring lanes with camera vision. Assessment of lane departure is performed with yaw speed measurement and determination method for false alarm of ISO 17361 and performance validation is executed after generating departure warning boundary line by considering deviation error of LDAS using DGPS. Distance between the wheel and the lane is obtained through line abstraction using Hough transformation of the lane image with camera vision. Evaluation validation is obtained by comparing this value with the distance obtained with LDAS. The experimental result shows that the error of the extracted distance of the LDAS is within 5 cm. Also it proves performance of LDAS based on DGPS-GIS and assures effectiveness of the proposed validation method for system reliability using camera vision.
Development of New Numerical Model and Controller of AFS System
Song, Jeonghoon ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 59~67
DOI : 10.7467/KSAE.2014.22.6.059
A numerical model and a controller of Active Front wheel Steer (AFS) system are designed in this study. The AFS model consists of four sub models, and the AFS controller uses sliding mode control and PID control methods. To test this model and controller an Integrated Dynamics Control with Steering (IDCS) system is also designed. The IDCS system integrates an AFS system and an ARS (Active Rear wheel Steering) system. The AFS controller and IDCS controller are compared under several driving and road conditions. An 8 degree of freedom vehicle model is also employed to test the controllers. The results show that the model of AFS system shows good kinematic steering assistance function. Steering ratio varies depends on vehicle velocity between 12 and 24. Kinematic stabilization function also shows good performance because yaw rate of AFS vehicle tracks the reference yaw rate. IDCS shows improved responses compared to AFS because body side slip angle is also reduced. This result also proves that AFS system shows satisfactory result when it is integrated with another chassis system. On a split-m road, two controllers forced the vehicle to proceed straight ahead.
Fatigue Durability Analysis due to the Classes of Automotive Wheels
Han, Moonsik ; Cho, Jaeung ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 68~74
DOI : 10.7467/KSAE.2014.22.6.068
This study analyzes structural stress and fatigue about three types of automotive wheels. As maximum equivalent stresses at 1, 2 and 3 types become lower than the yield stress of material and deformations become minute, theses types are thought be safe on durability. Type 2 model has the most fatigue life among three kinds of types and the rest of models with fatigue lives are shown in the order of type 1 and 3. As the most fatigue frequency of type 2 model happens at the state of average stress and amplitude stress on the stress range narrower than type 1 or 3, type 2 model becomes most stable. In case of type 2 with the state near the average stress of 0 MPa and the amplitude stress of 300MPa, the possibility of maximum damage becomes 30%. This stress state can be shown as the most damage possibility. These study results can be effectively utilized with the design on automotive wheel by anticipating and investigating prevention and durability against its damage.
Effects of Sensation Seeking and Driving Confidence Level on Reckless Driving Behavior in Motor Sports Club's Members
Son, Sung-Uk ; Huh, Jin-Young ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 75~82
DOI : 10.7467/KSAE.2014.22.6.075
The purpose of this study is to identify the effects of sensation seeking and driving confidence level on reckless driving behavior in motor sports club's members. Data was collected from 265participants of the Trackday, driving school. Subjects answered the questionnaire using convenient sampling method. Data which is obtained through self-administration was analyzed by using the frequency analysis and multiple regression. Results are as follows. First sensation seeking has influenced on reckless driving behavior such as, drunken driving and errors. Second, driving confidence level has influenced on reckless driving behavior such as, drunken driving, overspeed driving and errors.
Development of Low Temperature Diesel Combustion Engine for Construction Equipments
Shim, Euijoon ; Kim, Duksang ; Lee, Dongin ; Park, Yonghee ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 83~88
DOI : 10.7467/KSAE.2014.22.6.083
LTC(Low Temperature Combustion) technology has been studied to see feasibility of the combustion technology applied to heavy-duty engines on the laboratory scale. This study succeeded to develop a demo engine including realized low temperature combustion under partial load conditions. To find the best feasible LTC strategy, various LTC combustion methods such as PPCI, MK and highly diluted mixing controlled LTC were conducted on 6.0L heavy duty diesel engine. Air management system was re-designed to make these combustion scheme stable and the re-designed air system helped expand LTC operating range. This study finally revealed plausible LTC concept to maximize benefit of the alternative combustion technology while overcoming handicaps of the LTC strategy.
An Experimental Study on the Benefit of Pre-ventilation Using Solar Sunroof
Lee, Daewoong ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 89~95
DOI : 10.7467/KSAE.2014.22.6.089
This study presented the benefit of the pre-ventilation using solar sunroof with integrated photovoltaic. Recent year, auto-makers make an effort to enhance the fuel efficiency and moreover to clean the cabin passenger's health. Solar energy, one of the alternative energies, adapted in automotive air handling system, in order to pre-ventilation when vehicle parked under the sun in summer. The power generated by a prototype solar sunroof has been used to run blower in a air handing system. And the solar sunroof was installed in a vehicle, and evaluated to find out benefit of the pre-ventilation. The effect of reducing the cabin temperature about
with 20 ~ 40W power generator from solar sunroof were obtained in the pre-ventilation test. This reduced thermal load can lead to the reduction of air-conditioning operation time than that of current car. Moreover, fuel economy may increase as a results of the short use of the air-conditioning time. Additionally, Total Volatile Organic Compounds in the cabin is reduced maximum 80% than that of the current vehicle.
Comparison of Combustion Characteristics with Combustion Strategy and Excess Air Ratio Change in a Lean-burn LPG Direct Injection Engine
Cho, Seehyeon ; Park, Cheolwoong ; Oh, Seungmook ; Yoon, Junkyu ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 96~103
DOI : 10.7467/KSAE.2014.22.6.096
Liquefied Petroleum Gas(LPG) has attracted attention as a alternative fuel. The lean-burn LPG direct injection engine is a promising technology because it has an advantage of lower harmful emissions. This study aims to investigate the effect of combustion strategy and excess air ratio on combustion and emission characteristics in lean-burn LPG direct injection engine. Fuel consumption and combustion stability were measured with change of the ignition timing and injection timing at various air/fuel ratio conditions. The lean combustion characteristics were evaluated as a function of the excess air ratio with the single injection and multiple injection strategy. Furthermore, the feasibility of lean operation with stratified mixture was assessed when comparing the combustion and emission characteristics with premixed lean combustion.
Numerical Analysis to Predict the Time-dependent Behavior of Automotive Seat Foam
Kang, Gun ; Oh, Jeong Seok ; Choi, Kwon Yong ; Kim, Dae-Young ; Kim, Heon Young ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 104~112
DOI : 10.7467/KSAE.2014.22.6.104
Generally, numerical approaches of evaluation for vehicle seat comfort have been studied without considering time-dependent characteristics and the only seating moment have been considered in seat design. However, the comfort not only at the seating moment but also in the long-term should be evaluated because the passengers are sitting repeatedly on the seat to drive the vehicle for hours. So, the aim of this paper is to carry out a quantitative evaluation of the time-dependent mechanical characteristics of seat foams and to suggest a process for predicting the viscoelastic deformation of seat foam in response to long-term driving. To characterize the seat materials, uniaxial compression and tension tests were carried out for the seat foam and stress relaxation tests were performed for evaluating the viscoelastic behavior of the seat foam. A unit solid element model was used to verify the reliability of the material model with respect to the compression behavior of the seat foam. It is not straightforward to evaluate the time-dependent compression of foams using the explicit solver because the viscoelastic material model is limited. To use the explicit solver, the material model must be modified using stress-degradation data. Normalized stress relaxation moduli were added to the stress-strain curves obtained under static conditions to achieve a time-dependent set of stress-strain relations that were compatible with the implicit solver. There was good agreement between the analysis results and experimental data.
Effects of Vehicle Electric Components on the Steering Input Torque
Cho, Hyunseok ; Lee, Byungrim ; Chang, Sehyun ; Park, Youngdae ; Kim, Minjun ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 113~119
DOI : 10.7467/KSAE.2014.22.6.113
For the robust design of Motor Driven Power Steering (MDPS) systems, it is important to consider energy efficiency from every aspect such as system configuration and current flow, etc. If design optimization is not considered, it has many problems on a vehicle. For example, when evaluating steering test, particularly the Catch-up test which turning the steering wheel left or right quickly, steering effort should be increased rapidly. Also a vehicle might have poor fuel efficiency. In this study, it is calculated energy consumption for each component of the steering system and analyzed factors of energy consumption. As a result, this paper redefines a method to estimate steering input torque using characteristics of vehicle electric components and then conducts an analysis of contribution for the Catch-up.
Investigation of Combustion Strategy for Commercialization of Low Temperature Diesel Combustion Engine
Shim, Euijoon ; Han, Youngdeok ; Shin, Seunghyup ; Kim, Duksang ; Kwon, Sangil ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 120~127
DOI : 10.7467/KSAE.2014.22.6.120
Robustness and controllability are the key factors in internal combustion engine commercialization. This study focuses on the combustion strategy to commercialize the low temperature diesel combustion technology. Various LTC combustion methods such as PPCI, MK and highly diluted mixing controlled LTC were conducted on 6.0L heavy duty diesel engine. To find the best feasible LTC strategy, emission level, fuel consumption and combustion safety during the combustion mode change were considered. Experiments were carried out under various engine operating conditions; engine speed & load, EGR level, injection timing. Finally, this study suggests realizable LTC combustion strategy; moderate EGR level and slight early injection are possible to considerably lower PM, NOx emission and expand LTC operating range up to 50% load without CO and HC emission.
Durability Study through Structural and Fatigue Analyses of Brake Pads with Different Configurations
Han, Moonsik ; Cho, Jaeung ;
Transactions of the Korean Society of Automotive Engineers, volume 22, issue 6, 2014, Pages 128~133
DOI : 10.7467/KSAE.2014.22.6.128
In this study, Two kinds of pad models with different configurations as the part of brake system are investigated by structural and fatigue analyses. As the maximum equivalent stress of model 2 becomes higher to the extent of 60% than that of model 1, model 2 can endure more load than model 1. In cases of two kinds of models, the maximum fatigue life at 'Sample history' becomes longer 60 times than 'SAE bracket history' and this life in case of 'SAE transmission' becomes longer 3.5 times than the case of 'SAE bracket history'. Maximum fatigue damages in cases of 'SAE bracket history', 'SAE transmission' and 'Sample history' at model 1 become higher than model 2. Model 2 is thought to have more fatigue durability than model 1. These study results can be effectively utilized with the design of brake pad by anticipating and investigating prevention and durability against its fatigue damage.