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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 21, Issue 6 - Nov 2013
Volume 21, Issue 5 - Sep 2013
Volume 21, Issue 4 - Jul 2013
Volume 21, Issue 3 - May 2013
Volume 21, Issue 2 - Mar 2013
Volume 21, Issue 1 - Jan 2013
Selecting the target year
An Investigation on the Spray Characteristics of DME with Variation of Nozzle Holes Diameter using the Common Rail Fuel Injection System
Lee, Sejun ; Lim, Ocktaeck ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 1~7
DOI : 10.7467/KSAE.2013.21.4.001
DME spray characteristics were investigated about varied ambient pressure and fuel injection pressure using the DME common rail fuel injection system when the nozzle holes diameter is varied. The common rail fuel injection system with DME cooling system was used since DME has properties of compressibility and vaporization in atmospheric temperature. The fuel injection quantity and spray characteristics were measured. The spray analysis parameters were spray shape, penetration length, and spray angle at six nozzle holes. Three types of injector were used, the nozzle holes diameter were 0.166 mm (Injector 1), 0.250 mm (Injector 2), and 0.250 mm with enlargement of orifice hole from 0.6 mm to 1.0 mm (Injector 3). The fuel injection pressure was varied by 5MPa from 35 to 70MPa when the ambient pressure was varied 0, 2.5, and 5MPa. When using Injector 3 in comparison to the others, the DME injection quantity was increased 1.69 ~ 2.02 times. Through this, it had the similar low heat value with diesel which was injected Injector 1. Among three types of injector, Injector 3 had the fastest development velocity of penetration length. In case of spray angle, Injector 2 had the largest spray angle. Through these results, only the way enlargement the nozzle holes diameter is not the solution of DME low heat value problem.
Development of Optimization Logic for Electric Vehicle with Multiple Axle Power System Based on Vehicle Dynamics
Jeong, Jongryeol ; Shin, Changwoo ; Lim, Wonsik ; Cha, Suk Won ; Jang, Myeong Eon ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 8~15
DOI : 10.7467/KSAE.2013.21.4.008
Recently many kinds of electric vehicles have been developed as many governments demand the environmental friendly vehicles. In this paper, study of load optimization for the electric vehicle which has multiple axle power system was conducted. For the analysis of the vehicle which has three or four driving axles, a method based on the geometry and assumptions that considering axles as a spring model and normal forces of the axles are proportional to the displacement of the axles was applied with basic vehicle dynamics. With the developed vehicle analysis technique, algorithm to find the optimal motor operating points was developed. Using this algorithm, it was possible to find the optimization of vehicle load distribution for multiple axles according to the driving cycles. Also, control logic for the vehicle can be developed based on the optimization simulation results.
Material Optimization of BIW for Minimizing Weight
Jin, Sungwan ; Park, Dohyun ; Lee, Gabseong ; Kim, Chang Won ; Yang, Heui Won ; Kim, Dae Seung ; Choi, Dong-Hoon ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 16~22
DOI : 10.7467/KSAE.2013.21.4.016
In this study, we propose the method of optimally changing material of BIW for minimizing weight while satisfying vehicle requirements on static stiffness. First, we formulate a material selection optimization problem. Next, we establish the CAE procedure of evaluating static stiffness. Then, to enhance the efficiency of design work, we integrate and automate the established CAE procedure using a commercial process integration and design optimization (PIDO) tool, PIAnO. For effective optimization, we adopt the approach of metamodel based approximate optimization. As a sampling method, an orthogonal array (OA) is used for selecting sampling points. The response values are evaluated at the sampling points and then these response values are used to generate a metamodel of each response using the linear polynomial regression (PR) model. Using the linear PR model, optimization is carried out an evolutionary algorithm (EA) that can handle discrete design variables. Material optimization result reveals that the weight is reduced by 44.8% while satisfying all the design constraints.
Study on the Simulation of the Intake and Exhaust Systems of a Gasoline Engine Using BOOST
Lee, Dae-Kwon ; Yoon, Keon-Sik ; Ryu, Soon-Pil ; Woo, Seok-Keun ; Seong, Hwal-Gyeong ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 23~32
DOI : 10.7467/KSAE.2013.21.4.023
This paper presents the simulation of the multi-cylinder 4-stroke cycle spark-ignition engine using a commercial simulation tool, AVL BOOST. Various models were examined to select the appropriate models that would best serve to analyze the main components of the intake and exhaust systems-the plenum chamber, the muffler and the exhaust manifold branch junction. For the plenum chamber and the muffler, the tank model and the pipe model were tested. In order to analyze the exhaust manifold branch junction, a complicated model which reflects the actual shape and involves pressure drops was compared to a simplified one. The results show that both the tank model and the pipe model are applicable with satisfying accuracies for the plenum chamber and the muffler. However, the tank model is more desirable in regards to convenience in modeling and efficiency in calculation. Though both the complicated model and the simplified model show satisfying accuracies for the exhaust manifold branch junction, the simplified model is recommended in regards to convenience in modeling and efficiency in calculation.
Multiple Vehicle Tracking in Urban Environment using Integrated Probabilistic Data Association Filter with Single Laser Scanner
Kim, Dongchul ; Han, Jaehyun ; Sunwoo, Myoungho ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 33~42
DOI : 10.7467/KSAE.2013.21.4.033
This paper describes a multiple vehicle tracking algorithm using an integrated probabilistic data association filter (IPDAF) in urban environments. The algorithm consists of two parts; a pre-processing stage and an IPDA tracker. In the pre-processing stage, measurements are generated by a feature extraction method that manipulates raw data into predefined geometric features of vehicles as lines and boxes. After that, the measurements are divided into two different objects, dynamic and static objects, by using information of ego-vehicle motion. The IPDA tracker estimates not only states of tracks but also existence probability recursively. The existence probability greatly assists reliable initiation and termination of track in cluttered environment. The algorithm was validated by using experimental data which is collected in urban environment by using single laser scanner.
Detection of Lane Marking Candidates by Using Scale-space
Yoo, Hyeon-Joong ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 43~53
DOI : 10.7467/KSAE.2013.21.4.043
Lane marking detection based on a mono camera sensor provides a low cost solution to both ITS (intelligent transportation systems) and DAS (driver assistant systems). A number of methods and implementations have been reported in the literature. However, reliable detection is still an issue. Traditional approaches are mostly based on statistics or Hough transforms. However, the former approaches usually include many irrelevant detection areas, and the latter are not practical because actual lanes are not usually suitable for the approximation with linear or polynomial equations. In this paper, we focus on increasing the reliability of detection by reducing the detection of irrelevant areas while improving the detection of actual lane marking areas, which is usually a tradeoff for most conventional approaches. We use scale-space for that. Through experiments with real images obtained from various environments, we could achieve a significant improvement over traditional approaches.
A Study on the Neck Injury Criteria Using BioRID-II during Very Low Speed Rear-end Collision
Hong, Seungjun ; Ryu, Hankyu ; Kim, Youngeun ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 54~61
DOI : 10.7467/KSAE.2013.21.4.054
Although typically classified as AIS 1, whiplash injuries continue to represent a substantial social problem with associated costs estimated at over $1 billion annually. The primary objective of this study was to determine the effects of seat positions(seatback angle, headrest height) on risk for whiplash injury in very low speed(
The Impact of Cognitive Workload on Driving Performance and Visual Attention in Younger and Older Drivers
Son, Joonwoo ; Park, Myoungouk ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 62~69
DOI : 10.7467/KSAE.2013.21.4.062
Visual demands associated with in-vehicle display usage and text messaging distract a driver`s visual attention from the roadway. To minimize eyes-off-the-road demands, voice interaction systems are widely introduced. Under cognitively distracted condition, however, awareness of the operating environment will be degraded although the driver remains oriented to the roadway. It is also know that the risk of inattentive driving varies with age, thus systematic analysis of driving risks is required for the older drivers. This paper aims to understand the age-related driving performance degradation and visual attention changes under auditory cognitive demand which consists of three graded levels of cognitive complexity. In this study, two groups, aged 25-35 and 60-69, engaged in a delayed auditory recall task, so called N-back task, while driving a simulated highway. Comparisons of younger and older drivers` driving performance including mean speed, speed variability and standard deviation of lane position, and gaze dispersion changes, which consist of x-axis and y-axis of visual attention, were conducted. As a result, it was observed that gaze dispersion decreased with each level of demand, demonstrating that these indices can correctly rank order cognitive workload. Moreover, gaze dispersion change patterns were quite consistent in younger and older age groups. Effects were also observed on driving performance measures, but they were subtle, nonlinear, and did not effectively differentiate the levels of cognitive workload.
The Study of PM2.5 and Exhaust Emission Characteristics in the Motorcycles according to Various Lubricants
Lim, Yunsung ; Lee, Jongtae ; Park, Jangmin ; Kim, Jeongsoo ; Lee, Janghoon ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 70~76
DOI : 10.7467/KSAE.2013.21.4.070
Because increased food delivery service and quick delivery service using motorcycle, registration numbers of motorcycles were sharply increased and it could contribute on worsening air quality. In this study, two models(50cc, 125cc) of motorcycle were tested by using three types of engine oil. Two motorcycles were tested with CVS-40 mode for emission characteristics such as CO, THC, NOx, Elemental Carbon(EC), Organic Carbon(OC), sulfate, soot and SOF(soluble organic fraction). Result of according to three types of lubricants which included phosphorus, sulfate ash impacted to particle matters so "C" lubricants is more higher PM than "A", "B" lubricants in this research.
A Study on the Friction Stir Welding Characteristics of AZ31 Mg Alloy by the Design of Experiment
Kang, Dae Min ; Park, Kyoung Do ; Jung, Yung Suk ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 77~82
DOI : 10.7467/KSAE.2013.21.4.077
In this paper, the design of experiment with two-way factorial design was adopted and from that, optimum values of welding variables including the welding speed and rotation speed were found to improve the strength of AZ31 magnesium alloy sheets joined by the friction stir technique. Tool with shoulder diameter of 12 mm and pin diameter of 3.5 mm was used. Also the welding direction was aligned with the material rolling direction, and dimensions of the AZ31 magnesium alloy sheets were
. Conditions of rotation speed were 1000, 1100 and 1200 rpm and those of welding speed were 200, 300 and 400 mm/min. As far as this work is concerned, the optimal conditions for friction stir joint were predicted as the rotation speed of 1200 rpm and welding speed of 200 mm/min.
Effects of Injection Strategies on the Partial Premixed Charge Combustion and Emission Characteristics in a Diesel Engine
Kim, Jaewoong ; Kim, Yungjin ; Park, Sangki ; Lee, Kihyung ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 83~88
DOI : 10.7467/KSAE.2013.21.4.083
Recently, PCCI (premixed charge compression ignition) combustion is studied to reduce both NOx and PM because of homogeneous mixture formation and lower combustion temperature. It has also merit of increasing thermal efficiency owing to better air-fuel mixure. However, it is well known that PCCI combustion has a weakness in fuel economy because PCCI combustion tends to start before TDC. Therefore, it is necessary to find an optimal conditions for PCCI combustion which maintains reduction of NOx, PM and increase of thermal efficiency. In this study, pPCCI combustion was realized by adding early injection strategy to a conventional diesel engine. In addition, the characteristics of pPCCI combustion was analized by comparing conventional diesel injection strategy. The results show that NOx and PM per power in pPCCI combution were reduced compared to a conventional diesel combustion.
A Study on the Injection Characteristics of Swirl Nozzle Injector in Common-rail System for High Pressure Fuel Injection
Sin, Yunsub ; Lee, Geesoo ; Kim, Hyunchul ; Kwak, Sangshin ; Shin, Suk Shin ; Suh, Hyun Kyu ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 89~95
DOI : 10.7467/KSAE.2013.21.4.089
In this work, the evaluation of swirl nozzle injector performance was conducted by investigating effective area (
), injection mass (
), injection rate (
), and injection delay (
) under various test conditions. To achieve these, fuel injection analysis system which was composed of fuel supply system, injection system, and control system was installed. At the same time, the swirl nozzle that had 12 orifice hole with
injection angle was used in this work. It was revealed that the difference of injection mass (
) between base and swirl nozzle injector increased as the injection pressure (
) and energizing duration (
) decreased under the same test conditions. The maximum injection rate (
) of swirl nozzle injector was higher than base nozzle injector about 2~5%. The injection performance of swirl nozzle was better than base nozzle at low injection pressure (
) and short energizing duration (
Standard Wire Harness Designs in Commercial Vehicles Based on Control Types and Functional Blocks
Lim, Hansang ; Bae, Seung-Deuk ; Jung, Do Hwan ; Jeong, Hyun Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 96~105
DOI : 10.7467/KSAE.2013.21.4.096
This paper presents a standardization method for designing wire harness systems, based on the control types and functional blocks, for use in commercial vehicles. With a rapid increase in the installation of systems with added new features, it is very important to develop a reliable wire harness design in a short time by standardizing wire harness designs and reusing the standard design. Because the function of a system, particularly, for commercial vehicles, varies significantly on the basis of the requirements, regulations, and options, it is not effective to establish one standard design for one system. In addition, a system with the same function may differ in terms of the input conditions and output loads on the basis of the installed vehicle types, and it is not practical to standardize a harness design targeting an entire system. In this study, the wire harness designs of a system were classified into six categories based on the control types of the system: switch driven, control of a switch, control of an electronic control unit, unit driven, control of a unit, and connector operation. Then, a wire harness design of each system was divided into three blocks according to their functions: the control, drive, and monitoring blocks. The standard wire harness designs were made for each functional block of each control type. The advantage of this proposed method is that an effective and practical design can be obtained, which covers the diversities in the same system for different grades of commercial vehicles with a reduction in the number of wire harness supplements.
Emission Characteristics of HCNG Engine with Compression Ratio Change
Lee, Sungwon ; Lim, Gihun ; Park, Cheolwoong ; Choi, Young ; Kim, Changgi ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 106~112
DOI : 10.7467/KSAE.2013.21.4.106
Compression ratio is an important factor affecting engine performance and emission characteristics since thermal efficiency of spark ignition engine can be theoretically improved by increasing compression ratio. In order to evaluate the effect of compression ratio change in HCNG engine, natural gas engine was employed using HCNG30 (CNG 70 vol%, hydrogen 30 vol%). Combustion and emission characteristics of CNG and HCNG fuel was analyzed with respect to the change of compression ratio at each operating condition. The results showed that thermal efficiency improved and
emission decreased with the increase in compression ratio while
emissions were decreased at a certain excess air ratio condition. Higher thermal efficiency and further reduction of exhaust emissions can be achieved by the increase of compression ratio and the retard of spark timing.
Characterization of TLP Bonded of Magnesium AZ31 Alloy using a Nickel Interlayer
Jin, Yeung Jun ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 113~119
DOI : 10.7467/KSAE.2013.21.4.113
The transient liquid phase (TLP) bonding was used to fabricate autogenous joints in a magnesium alloy AZ31 with the aid of a pure Ni interlayer. A
thick pure Ni foil was used in order to form a Mg-Ni eutectic liquid at the joint interface. The interface of reaction and composition profiles were investigated as a function of bonding time using a pressure of 0.16 MPa and a bonding temperature of
. The quality of the joints produced was examined by metallurgical characterization and the joint microstructure developed across the diffusion bonds was related to changes in mechanical properties as a function of the bonding time.
An Analysis Study for Thermal Design of ISG (Integrated Starter & Generator) for Hybrid Electric Vehicle
Kim, Dae Geon ; Kim, Sung Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 120~127
DOI : 10.7467/KSAE.2013.21.4.120
Hybrid electric vehicles have applied electric parts for saving fuel consumption and reducing levels of environmental pollution. Electrification of automobiles is indispensable for entering into global market because of enhanced environment restriction. ISG (Integrated Starter & Generator) system is one of main electric parts and can improve fuel efficiency more than other components by using Idle Stop & Go function and regenerative braking system. However, if ISG motor and inverter work under the continuously high load condition, it will make them the decrease of performance and durability. So the ISG motor and inverter need to properly design the cooling system of them. In this study, we suggested the enhancement points by modifying the thermal design of ISG motor and then confirmed the improvement of the cooling performance.
Center Pillar Design for High Bending Collapse Performance
Kang, Sungjong ; Park, Myeongjae ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 128~134
DOI : 10.7467/KSAE.2013.21.4.128
High bending collapse performance (maximum resistance force and mean resistance force) of body center pillar is an important design target for vehicle safety against side impact. In this study, effect of the upper section shape and the thickness of outer reinforcement on bending collapse performance was investigated for the center pillar of a large passenger car. First, through bending collapse analyses using simple models with uniform section, an optimized center pillar upper section was chosen. Next, bending collapse performance for various models of the actual center pillar with changing the thickness of outer reinforcement were analyzed. The finally designed model showed distinctive enhancement in bending collapse performance nearly without weight increase.
A Study on Evaluation of Oxidation Degradation of Bidiesel and Biodiesel Blended Fuel Distributing in Domestic
Min, Kyong-Il ; Yim, Eui Soon ; Na, Byung-Ki ; Jung, Choong-Sub ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 135~143
DOI : 10.7467/KSAE.2013.21.4.135
In this study, we suggested effective countermeasure of biodiesel oxidation problems by investigating the oxidation degradation of biodiesels derived from variable resources and the level of oxidation stability of current distributing biodiesel blended fuels (2%) in Korea, and oxidation stability change according to storage time (for 3 month) and biodiesel blending ratio (2, 5, 7, 10%). By the composition analysis results of biodiesel from various resources which are possible to distribute in Korea, the biodiesel from animal fat has poor oxidation stability and cold performance, while the biodiesel from coconut and palm kernel which are considered as future potential raw material showed good oxidation stability and cold performance. The oxidation stability level of current distributing biodiesel blended fuels in Korea was excellent with showing over 30 hours (average 68 hours) stability, but the oxidation stability of the blended fuel with animal fat biodiesel having poor oxidation property (1.22 hours) was rapidly decreased to below 32 hours by mixing only 2%. Therefore, we have to pay attention to quality control of oxidation property, because the oxidation stability problem can be caused by increasing biodiesel blending ratio and diversifying raw materials those have worse property.
A Study on Design Specifications and Evaluation of Structural Strength for PRT
Cho, Jeonggil ; Koo, Jeongseo ; Kang, Seokwon ; Jeong, Raggyo ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 144~152
DOI : 10.7467/KSAE.2013.21.4.144
PRT(Personal Rapid Transit) system is a new transportation system which will meet increasing demands of traffic in Korea. It is also an environment-friendly transportation and automatically operated. For these reasons, researches on the PRT system are actively undergoing, but the PRT vehicles have different forms of subway, bus, etc. There are no design standards to evaluate structural integrity, yet. In this paper, Structural design specifications are derived, which are based on the performance test standard for EMU and the ASCE-APM standards. We also perform the static and fatigue analyses by FE simulation and suggest strategies to improve an initial structure design. In addition, we derived the design specifications for energy-absorbing structures to meet the conditions of the collision scenarios predefined from a view point of operation safety.
Study on the Apply Characteristics to the Gasoline Engine of Exhaust Heat Recovery Device Counterflow
Shin, Suk-Jae ; Kim, Jong-Il ; Jung, Young-Chul ; Choi, Doo Seuk ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 153~158
DOI : 10.7467/KSAE.2013.21.4.153
The purpose of this study is to investigate the performance characteristics of the counterflow exhaust heat recovery device for the applied gasoline engines. The EHRS device is installed behind the catalyst. This study investigates the engine warm-up characteristic, the exhaust noise characteristic, the back-pressure characteristic. The engine warm-up characteristics is (load 0%, load 10%, load 20%) in (idle, 1000rpm, 1500rpm, 2000rpm, 2500rpm) conditions by measuring the time it warmed up, coolant temperature (
) until the performance evaluation is performed. The wide open throttle and the coast down the exhaust noise and the back-pressure characteristic experiment repeated twice. The test conditions is 950rpm~6,050rpm proceed experiment repeated 3-5 times. Load 0% idle conditions except the results improved engine warm-up characteristics. The exhaust noise obtain similar results the BASE+EHRS W/O_FRT_MUFF with BASE and back-pressure to obtain similar results BASE+EHRS W/O_FRT_ MUFF with BASE+EHRS.
Analysis of the Irradiation Distance of Dipped-beam Headlamps Using Computer Simulation
Cho, Hyun Yul ; Lee, Ho Sang ; Yong, Boojoong ; Woo, Hyun Gu ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 159~165
DOI : 10.7467/KSAE.2013.21.4.159
One of the leading causes of night time automobile accidents is the darkness of surroundings. Headlamps play a critical role in casting light and providing drivers with visibility. Headlamp design and new technology have been developed recently as research has been actively carried out to increase headlamp recognition. This study statistically analyzes irradiation distance using computer simulation by categorizing headlamps applied in domestic automobiles in the last decade by year, light source, form, vehicle type, and height of installation. After analyzing results of irradiation distance, it appears irradiation distance has been increased by approximately 10m in the last decade. This increase in irradiation distance is predicted to decrease night time accidents by allowing more time to recognize potential causes of accidents.
Experimental Static Strength Evaluation of a Passenger Car Aluminium Multi-link Suspension Corner Module
Cho, Wonyong ; Choi, Gyoojae ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 166~173
DOI : 10.7467/KSAE.2013.21.4.166
An aluminum suspension corner module is widely used in high class passenger cars to reduce vehicle weight and improve fuel economy. According to the change of material and suspension type, the evaluation of the static strength and failure mode of the corner module is important. In this study, static strength and failure mode analysis of aluminium multi-link suspension corner module is presented. Static strength test system is designed and static failure mode tests of the corner module are carried out in longitudinal, lateral, and vertical direction. From the resuls of the tests we found that the failure modes are different compare to those of the steel corner module. The static failure modes and load-displacement curves of this study will be used as a guidance in design of a passenger car aluminium multi-link suspension corner module.
Vibration Characteristics of Non-pneumatic Tire with Honeycomb Spokes
Jo, Hongjun ; Lee, Chihoon ; Kim, Kwangwon ; Kim, Dooman ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 174~180
DOI : 10.7467/KSAE.2013.21.4.174
The vibration characteristic of tire is heavily related to the noise and comfort on driving. Therefore, in this paper, we investigate modal charateristic of non-pneumatic tires with Honeycomb spokes. The modal analysis of non-pneumatic tire is investigated for geometric of non-pneumatic tire(NPT) which is designed according to the cell angle of honeycomb cell. Investigation of natural frequencies and mode shapes of non-pneumatic tire are compared regular type NPT with auxetic type NPT. The analysis is based on the finite element method and used ABAQUS program which is able to analyze of non-linear. The material of NPT is used for the Ogden energy model which is model of hyperelastic material. As a result, natural frequencies and mode shapes of non-pneumatic tires with honeycomb spokes are affected by the angle of honeycomb cell.
Verification and Hydraulic Model Development of 3rd Generation Piezo Injector for CRDi System in Passenger Vehicle
Jo, Insu ; Jeong, Myoungchul ; Lee, Jinwook ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 181~187
DOI : 10.7467/KSAE.2013.21.4.181
Performance of DI diesel engine with high fuel injection method is directly related to its emission characteristics and fuel consumption. In this study, numerical model of 3rd generation piezo-driven injector was designed to analyze the hydraulic performance. Also the injection response characteristics was investigated by using the AMESim simulation code. From this study, it was shown that 3rd generation piezo-driven injector had a faster response and had better control capability due to its hydraulic bypass-circuit that has potential to higher hydraulic characteristics and improved accuracy of injected fuel quantity.
Characteristics Analysis of the Hydraulic Motor Design Variables
Liu, Liang-Liang ; Jang, Joosup ;
Transactions of the Korean Society of Automotive Engineers, volume 21, issue 4, 2013, Pages 188~194
DOI : 10.7467/KSAE.2013.21.4.188
Hydrostatic pumps and motors occupy an important position in hydraulic system. There are a lot of researches on characteristics of hydraulic pumps, but not hydraulic motors. So in order to know the characteristics of hydraulic motors we had this research. The purpose of this study is to derive and analyze the theoretical calculation of hydraulic axial piston motor torque and torque ripples. Then, analyzed the differences between torque ripples with dead place and without dead place on the valve plate, and modeling a hydraulic motor with AMESim software. Finally, theoretical calculation of hydraulic motor torque ripples was verified from the viewpoint of simulation.