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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Automotive Engineers
Journal Basic Information
Journal DOI :
The Korean Society of Automotive Engineers
Editor in Chief :
Volume & Issues
Volume 14, Issue 6 - Nov 2006
Volume 14, Issue 5 - Sep 2006
Volume 14, Issue 4 - Jul 2006
Volume 14, Issue 3 - May 2006
Volume 14, Issue 2 - Mar 2006
Volume 14, Issue 1 - Jan 2006
Selecting the target year
A Study on Effect of a Combined Plasma EGR System upon Soot CO and
Emissions in Turbo Intercooler Common-rail Diesel Engines
Bae, Myung-Whan ; Ku, Young-Jin ; Lee, Bong-Sub ; Youn, Il-Joong ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 1~11
The aim in this study is to develop the combined EGR system with a non-thermal plasma reactor for reducing exhaust emissions and improving fuel economy in turbo intercooler ECU common-rail diesel engines. In this study, the characteristics of soot, CO and
emissions under four kinds of engine loads are experimentally investigated by using a four-cycle, four-cylinder, direct injection type, water-cooled turbo intercooler ECU common-rail diesel engine with a combined plasma exhaust gas recirculation(EGR) system operating at three kinds of engine speeds. The EGR and non-thermal plasma reactor system are used to reduce
emissions, and the non-thermal plasma reactor and turbo intercooler system are used to reduce soot and THC emissions. The plasma system is a flat-to-flat type reactor operated by a plasma power supply. The fuel is sprayed by pilot and main injections at the variable injection timing between BTDC
according to experimental conditions. It is found that soot emissions with increasing EGR rate are increased, but are decreased as the applied electrical voltage of the non-thermal plasma reactor is elevated at the same engine speed and load. Results also show that CO and
emissions are increased as EGR rate is elevated, and CO emissions are increased, but
emissions are decreased as the applied electrical voltage of the non-thermal plasma reactor is elevated at the same engine speed and load.
A Study on the Stiffness of a 13degree-type Impact Tester for Aluminum Wheels
Ko, Kil-Ju ; Kim, Man-Seob ; Song, Hyun-Woo ; Yang, Chang-Geun ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 12~19
It is positively necessary to study on the stiffness of a 13degree-type impact tester in order to improve the fracture prediction of impact testing in wheels using FE(finite-element) analysis. The 13degree-type impact tester consists of an impact striker, a wheel fixer, a steel plate, and four cylindrical rubbers. Important parts of the tester are the steel plate and four cylindrical rubbers which play a role of absorbing impact energy during impact testing. Because of these buffers, the RF(reaction force) variation of the lower part in the 13degree-type impact tester showed the tendency like a damped harmony oscillation during impact testing. In order to investigate the stiffness of a 13degree-type impact tester, this work measured each stiffness of a steel plate and cylindrical rubbers. The stiffness of a cylindrical rubber was measured using a compressive tester. On the other hand, the stiffness of a steel plate was predicted by simulating experimental method using FE analysis.
A Study on the Characteristics of Mixture Formation and Combustion in HCCI Engine according to the Various Injection Angles and Timings
Kim, Hyung-Min ; Ryu, Jea-Duk ; Lee, Ki-Hyung ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 20~25
Recently, there has been an interest in premixed diesel engines as it has the potential of achieving a more homogeneous and leaner mixture close to TDC compared to conventional diesel engines. Early studies are shown that in a HCCI(Homogeneous Charge Compression Ignition) engine, the fuel injection timing and injection angle affects the mixture formations. Thus the purpose of this study was to investigate relationship of combustion and mixture formations according to injection timing and injection angle in a common rail direct injection type HCCI engine using a early injection method called the PCCI(Premixed Charge Compression Ignition). From this study, we found that the fuel. injection timing and injection angle affect the mixture formations and in turn affects combustion in the PCCI engine.
Effect of Early Injection Strategy on the Combustion and Emission Characteristics of the Common-rail DI Diesel Engine
Yoon, Seung-Hyun ; Kim, Myung-Yoon ; Kim, Dae-Sik ; Lee, Je-Hyung ; Lee, Chang-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 26~31
An experimental investigation of an early injection strategy was conducted on a small single cylinder common-rail DI diesel engine to reduce the oxides of nitrogen(
) emission. The main objectives of this study were to investigate the emissions, performance and combustion characteristics in a diesel engine with early and two-stage injections. The two- stage injection was conducted to reduce the wall-wetting of early injected fuels on the cylinder wall or to promote the ignition of premixed charge. The engine test was performed at conditions of 1500rpm, injection timing ranging from TDC to BTDC
. The experimental results show that
emissions were decreased in both cases of early injection and two stage injection compared to the conventional diesel combustion by the near TDC injection. However, soot and products of incomplete products (i.e. HC and CO) are slightly increased. Also, the second injection near TDC promoted the ignition of premixed fuel, therefore, IMEP was increased.
Friction Characteristics of an Hydraulic Cylinder for an Automotive Manual Clutch
Lee, Byoung-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 32~38
A clutch hydraulic system for automotive manual transmissions transfers hydraulic pressure generated by driver's pedal manipulation to the clutch mechanism. The foot effort when the clutch pedal is pushed is different than that when the clutch is returned. The effort or load difference, called hysteresis, is caused by the friction produced between rubber seal and inner wall inside the hydraulic cylinder. This clutch pedal travel foot effort hysteresis is essential for a clutch hydraulic system design and analysis. The dynamic model for a clutch hydraulic system is developed and a simulation analysis is performed to estimate the fiction coefficient as a function of the cylinder pressure. The simulation result is then compared to the measurements obtained from a clutch hydraulic system tester to ensure the reliability of the dynamic model and the coefficients estimated. Also the estimated friction coefficients at various pressure values are compared to those reported by an independent study.
A Numerical Study on Combustion Characteristics of Single Cylinder Engine Fueled with DME
Kim, Hyun-Chul ; Kang, Woo ; Na, Byung-Chul ; Kim, Myung-Hwan ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 39~48
In this research, in order to study the spray, combustion, and emission characteristics of the common rail DME engine, the target engine was disassembled, and 3D CAD file was constructed using a 3D measurement machine and a rapid prototyping machine. Using the obtained 3D geometry, fine moving meshes are generated, and three dimensional non-steady turbulence flow field and combustion phenomenon including spray were numerically analyzed. As a result, IMEP of DME and diesel in medium and high speed revolution showed similar performance. As the DME fuel start to burn in spray area, the vaporized fuel rapidly spreads squish area in low speed revolution. In the case of DME engine, CO and NOx are relatively consistent with experiment results. It was found that the break-up, evaporation, collision model of DME fuel need to be properly adjusted through matching the characteristics of fuel and injector for further improvement.
Dynamic Models and Intelligent Control Algorithms for a
Automotive Air Conditioning System
Han, Do-Young ; Jang, Kyung-Chang ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 49~58
In the respect of the environmental protection viewpoint,
may be one of the most attractive alternative refrigerants for an automotive air-conditioning system. For the development of control algorithm of a
automotive air-conditioning system, characteristics of a
refrigerant should be considered. The high-side pressure of a
system should be controlled in order to improve the system efficiency. In this study, dynamic physical models of a
system were developed and dynamic behaviors of the system were predicted by using these models. Control algorithms of a
system were also developed and the effectiveness of these algorithm was verified by using dynamic models.
Strength Evaluation of Friction Welded SUH35/SUB3 Considering Stress Singularity
Chung, Nam-Yong ; Park, Chul-Hee ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 59~67
Recently, application of friction welded SUH35/SUH3 is increasing in the manufacturing process of automotive engine valves For securing its reliability and a reasonable strength evaluation method, it is necessary to assess stress singularity under the residual stress condition on the friction welded interface between dissimilar materials. In this paper, strength evaluation method of friction welded materials was investigated by boundary element method and static tensile testing. An advanced method of quantitative strength evaluation for SUH35/SUH3 friction welded material is to be suggested by establishing fracture criterion by using stress singularity factors.
Numerical Study on the Effect of Changes of Geometric Shape of Diesel Particulate Filter on Light-Off Characteristics and Transient Thermal Behavior during Regeneration
Jeong, Soo-Jin ; Lee, Sang-Jin ; Kim, Woo-Seung ; Lee, Chun-Beom ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 68~76
The minimization of maximum DPF wall temperature and the fast Light-off during regeneration are the targets for the high durability of the DPF system and the high efficiency of regeneration. In order to predict transient thermal response of DPF, one-channel numerical modeling has been adopted. The effect of the ratio of length to diameter(L/D), cell density, the amount of soot loading on temporal thermal response and regeneration characteristics has been numerically investigated under two different running conditions: city driving mode and high speed mode. The results indicate that the maximum wall temperature of DPF increase with increasing 'L/D' in 'High speed mode'. For 'City driving mode', the maximum wall temperature decreases with increasing 'L/D' in the range of
. The maximum temperature decreases with increasing cell density because heat conduction and heat capacity are increased. It is also found that the effect of amount of soot loading on light-off time is negligible.
In-Cylinder Compression Flow Characteristics According to Inlet Valve Angle
Ohm, In-Yong ; Park, Chan-Jun ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 77~83
A PIV(Particle Image Velocimetry) was applied to measure in-cylinder velocity field according to inlet valve angle during compression stroke. Two engines, one is conventional DOHC 4 valve and the other is narrow valve angle, were used to compare real compression flow. The results show that the flow patterns are well arranged compared with intake flow and the basic tumble flow structures are maintained until end compression stage regardless of valve angle. Also the results show that the tumble motion is intensified by momentum conservation during compression in normal engine. In the normal engine, the bulk shape of flow pattern is "Y" type at the top of cylinder and reverse "Y" type at the bottom of cylinder and weak reverse flow exists at the top of cylinder along cylinder center line. Otherwise, the other engine's flow pattern changes from "Y" type to "T" type at the top of cylinder during compression.
Effects of the EGR and Injection Pressure on the Combustion and Emission Characteristics of DME Commonrail Diesel Engine
Chung, Jae-Woo ; Kang, Jung-Ho ; Lee, Sung-Man ; Kim, Hyun-Chul ; Kang, Woo ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 84~91
In this study, the effect of EGR and fuel injection pressure on the characteristics of combustion and emission performance of the common-rail diesel engine is investigated using DME fuel as a smoke-free alternative fuel. Because the heating value and density of DME fuel are lower than those of diesel fuel, the injection duration of the DME engine is relatively longer than the injection duration of the diesel engine with the same injection pressure. However, the higher injection pressure can shorten the injection duration for the DME engine. Although the smoke level of the DME engine is much lower than that of the diesel engine, the NOx is at a level similar to that of the diesel engine. As a proposed solution for this, the EGR technique is empirically applied to the DME engine. In the experiments, the injection pressure was changed from 200bar to 400bar, and the EGR rate was limited under 40%. With the same injection timing and fuel amount, the experiment results indicated that the increase of injection pressure led to the increase of IMEP while decreasing HC and CO emissions. However, the NOx emission tends to increase as the injection pressure becomes higher. On the other hand, as the EGR rate was increased, NOx emission and A/F were reduced while the HC and CO emissions were increased. Because HC and CO emissions have the critical A/F point where the emissions of HC and CO are rapidly increased, it is proposed that the EGR rate must be limited under the critical EGR rate.
Roll Motion Analysis of a 3 D.O.F. Planar Car Model using Instantaneous Centers
Lee, Jae-Kil ; Shim, Jae-Kyung ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 92~98
In this paper, a planar car model with 3 degrees of freedom was analyzed using the concept of the roll center. To avoid ambiguity, force components which require experimental data were excluded. Only kinematic approach was used to find the position and orientation of the vehicle body and the position of the roll center. The roll center was found by the pole with infinitesimal movement and Kennedy-Aronhold theorem. Centrodes, which are the loci of instantaneous centers of planar motion, were constructed with analyzed results to show characteristics of vehicle body motion. To verify the presented analysis method in this paper, the locus of the roll center and the motion of a 3 D.O.F. planar car model were compared with those of the 1 D.O.F. model.
The Effect of High Velocity Oxygen Fuel Thermal Spray Coating on Fatigue Crack Growth Behavior for Welded SM490B
Yoon, Myung-Jin ; Choi, Sung-Jong ; Cho, Won-Ik ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 99~106
High velocity oxygen-fuel thermal spray coating of the WC-Co cermet material is a well-established process for modifying the surface properties of the structural components exposed to the corrosive and wear attacks, and also these coating are well-known method to improve the fatigue strength of material. In this study, HVOF coated SM490B are prepared to evaluation of the effect of coating on tension and fatigue crack growth behavior. The pre-crack of the fatigue crack growth test specimens machined at deposited material area, heat affected zone and boundary, respectively. Through these test, the following results are obtained: 1) Tensile strength was about 498 MPa, and fracture occurred on base metal area. 2) The fatigue crack of coated specimens propagated more rapidly than non-coated specimen in all specimens. 3) In the same coating thickness specimens, the specimens with pre-crack at boundary more rapidly propagated than the specimens with pre-crack at HAZ and deposited material area. These results can be used as basic data in a structural integrity evaluation of rolled SM490B weldments considering HVOF coating.
Construction of Web-based Material Database and Case Study of Material Selection for Automotive Engine Pulley
Chun, Doo-Man ; Ahn, Sung-Hoon ; Jang, Jae-Duk ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 107~114
Material selection is one of the important activities in design and manufacturing. A selected material at the conceptual design stage affects functionality of the designed part as well as manufacturability and cost of the final product. Unfortunately there are not many accessible material databases that can be used for design. In this research, a web-based material database was constructed. In order to assist designers to compare different materials, two-dimensional and three-dimensional graphs were provided via the web browser Using these graphical tools, multi-dimensional comparison was available in more intuitive manner. As a case study, this system was applied for material selection of an automotive engine pulley.
The Durability and Exhaust Emission Characteristics of an IDI Diesel Engine Using Biodiesel Fuel
Ryu, Kyung-Hyun ; Oh, Young-Taig ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 115~122
To evaluate the durability characteristics of in-direct injection diesel engine using BDF 20(a blend of 20% biodiesel fuel and 80% diesel fuel in volume), an IDI diesel engine used to commercial vehicle was operated on BDF 20 for 300 hours. Engine dynamometer testing was completed at regularly scheduled intervals to investigate the combustion characteristics, engine performance and exhaust emissions. The engine performance and exhaust emissions were sampled at 1 hour interval for analysis. From the results, the combustion variations such as the combustion maximum pressure(
) and the crank angle at which this maximum pressure occurs(
) were not appeared during long-time dynamometer testing. Also, BSFC with BDF 20 resulted in lower than with diesel fuel. The peak pressure with BDF 20 was higher than that with diesel fuel due to the oxygen content in BDF. And, BDF 20 resulted in lower emissions of carbon monoxide, carbon dioxide, and smoke emissions with a little increase of oxides of nitrogen than diesel fuel. It was concluded that there was no unusual deterioration of the engine, or any unusual change in exhaust emissions during the durability test of an IDI diesel engine using BDF 20.
Design of the Active Hood Lift System Using Orthogonal Arrays
Shin, Moon-Kyun ; Park, Kyung-Taek ; Lee, Keun-Bae ; Bae, Han-Il ; Park, Gyung-Jin ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 123~131
The majority of pedestrian fatalities and injuries are caused by vehicle-pedestrian accidents. Recently, it has been recognized as a serious problem. Injuries of occupants in a vehicle have been decreased considerably. However, efforts for protection of pedestrians are still insufficient. These days, many advanced industries are striving for a better protection of pedestrians by using an active hood lift system, rather than reforming the existing structure. In this research, the active hood lift system is designed to enhance the performance for protection. The active hood lift system is analyzed by using the nonlinear finite element method. An optimization problem is formulated by incorporation of the analysis results. Orthogonal arrays are utilized to solve the formulated problem. An iterative optimization algothrithm using orthogonal arrays is utilized for design in the discrete space. It is found that the method can remarkably decrease the number of function evaluations.
A Study on Atomization and Wall Impingement Process of Hollow-Cone Fuel Spray
Shim, Young-Sam ; Choi, Gyung-Min ; Kim, Duck-Jool ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 132~138
Numerical analysis about atomization and wall impingement process of hollow-cone fuel spray is performed by a modified KIVA code with hybrid model. The atomization process is modeled by using hybrid breakup model that is composed of Linearized Instability Sheet Atomization(LISA) model and Aerodynamically Progressed Taylor Analogy Breakup(APTAB) model. The Gosman model, which is based on the droplet behaviors after impingement determined by experimental correlations, is used for spray-wall impingement process. The LIEF technique was used to compare the results with those of experiment. The calculations and experiments are carried out at the ambient pressures of 0.1 MPa and 0.5 MPa and the ambient temperature of 293K. It was found that the calculated results show satisfactory agreement with experimental ones.
Cam Profile Design for Impulsive Noise Reduction of Automotive Engine Valve Train
An, Ki-Yong ; Kim, Do-Joong ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 139~148
Valve train is one of the important noise sources in idling engines. Valve train noise comes mostly from two different impacts. One is the impact between cam and tappet at the beginning of the valve open period, which is an important source of impulsive noise of valve trains. The other is the impact between valve and valve seat at the closing of the valve open period. In case of mechanical lash adjusters, it is very difficult to control the initial impact. In this paper, we designed various types of cam profiles, especially in the opening ramp design, and investigated the effect of cam profiles on the magnitude of the initial impact. The effects that some cam design parameters have on the impulsive noise are also observed.
Emissions and Combustion Characteristics of LPG HCCI Engine
Yeom, Ki-Tae ; Jang, Jin-Young ; Bae, Choong-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 149~156
This paper investigates the steady state combustion characteristics of LPG homogeneous charge compression ignition(HCCI) engine with variable valve timing(VVT) and dimethyl ether(DME) direct injection, to find out the benefits in exhaust gas emissions. VVT is one of the attractive ways to control HCCI engine. Hot internal residual gas which is controlled by VVT device, makes fuel is evaporated easily, and ignition timing is advanced. Regular gasoline and liquefied petroleum gas(LPG) were used as main fuel and dimethyl ether(DME) was used as ignition promoter in this research. Operating range and exhaust emissions were compared LPG HCCI engine with gasoline HCCI engine. Operating range of LPG HCCI engine was wider than that of gasoline HCCI engine. The start of combustion was affected by the intake valve open(IVO) timing and the
due to the latent heat of vaporization, not like gasoline HCCI engine. At rich operation conditions, the burn duration of the LPG HCCI engine was longer than that of the gasoline HCCI engine. CAD at 20% and 90% of the mass fraction burned were also more retarded than that of the gasoline HCCI engine. And carbon dioxide(CO2) emission of LPG HCCI engine was lower than that of gasoline HCCI engine. However, carbon oxide(CO) and hydro carbon(HC) emission of LPG HCCI engine were higher than that of gasoline HCCI engine.
Ratio Control of CVT by Considering the CVT System Efficiency
Ryu, Wan-Sik ; Kim, Hyun-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 157~163
A modified ratio control algorithm is proposed for the improvement of the fuel economy for a metal belt CVT. In the modified ratio control algorithm, the CVT ratio is controlled to operate the engine on the optimal operation region which provides the best efficiency from the view point of the overall efficiency of the engine-CVT system. In order to construct the modified ratio map, the CVT system loss model is used by assuming that the all the loss is attributed to the torque loss. It is found from the simulation results that the fuel economy by the modified ratio control algorithm is improved by 5.5 percents compared with the existing ratio control.
Analysis of Hydraulic Characteristics of High Pressure Injector with Piezo Actuator
Lee, Jin-Wook ; Min, Kyoung-Doug ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 164~173
In the electro-hydraulic injector for the common rail Diesel fuel injection system, the injection nozzle is being opened and closed by movement of a injector's needle which is balanced by pressure at the nozzle seat and at the needle control chamber, at the opposite end of the needle. In this study, the piezo actuator was considered as a prime movers in high pressure Diesel injector. Namely a piezo-driven Diesel injector, as a new method driven by piezoelectric energy, has been applied with a purpose to develop the analysis model of the piezo actuator to predict the dynamics characteristics of the hydraulic component(injector) by using the AMESim code. Aimed at simulating the hydraulic behavior of the piezo-driven injector, the circuit model has been developed and verified by comparison with the experimental results. As this research results, we found that the input voltage exerted on piezo stack is the dominant factor which affects on the initial needle behavior of piezo-driven injector than the hydraulic force generated by the constant injection pressure. Also we know the piezo-driven injector has more degrees of freedom in controlling the injection rate with the high pressure than a solenoid-driven injector.
Development of a Wheel Slip Control System for Vehicle Cornering Stability
Hong, Dae-Gun ; Huh, Kun-Soo ; Hwang, In-Yong ; SunWoo, Myoung-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 174~180
The wheel slip control systems are able to control the braking force more accurately and can be adapted to different vehicles more easily than conventional braking control systems. In order to achieve the superior braking performance through the wheel slip control, real-time information such as the tire braking force at each wheel is required. In addition, the optimal target slip values need to be determined depending on the braking objectives such as minimum braking distance, stability enhancement, etc. In this paper, a wheel slip control system is developed for maintaining the vehicle stability based on the braking monitor, wheel slip controller and optimal target slip assignment algorithm. The braking monitor estimates the tire braking force, lateral tire force and brake disk-pad friction coefficient utilizing the extended Kalman filter. The wheel slip controller is designed based on the sliding mode control method. The target slip assignment algorithm is proposed to maintain the vehicle stability based on the direct yaw moment controller and fuzzy logic. The performance of the proposed wheel slip control system is verified in simulations and demonstrates the effectiveness of the wheel slip control in various road conditions.
Continuous Contact Force Model for Low-Speed Rear-End Vehicle Impacts
Han, In-Hwan ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 181~191
The most common kind of vehicular accident is the low-speed rear-end impact that result in high portion of insurance claims and Whiplash Associated Disorders(WAD). The low-speed collisions have specific characteristics that differ from high speed collisions and must be treated differently This paper presents a simple continuous contact force model for the low-speed rear-end impact to simulate the accelerations, velocities and the contact force as functions of time. A smoothed Coulomb friction force is used to represent the effect of braking, which was found to be significant in simulating low-speed rear end impact. The intervehicular contact force is modeled using nonlinear damping and spring elements with coefficients and exponents. This paper presents how to estimate analytically stiffness and damping coefficients. The exponent of the nonlinear contact force model was determined to match the overall acceleration pulse shape and magnitude. The model can be used to determine
and peak accelerations for the purpose of accident reconstruction and for injury biomechanics studies.
Development of the Real-Time Simulator of a Turning-Type Sluice Gate Actuated by the Hydraulic Cylinder
Lee, Seong-Rae ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 192~198
The real-time simulator of a turning-type sluice gate actuated by the hydraulic cylinders is developed using a PC and a visual C++ program language. The real-time simulator receives the directional control valve signal selected by the operator using the mouse, updates the state variables of the turning-type sluice gate system responding to the control signal, and draws the moving figures of the sluice gate, cylinder, reserved water every drawing time on the PC monitor. Also, the operator can observe the sluice gate angle, cylinder force, cylinder pressures, and hydraulic power representing the operation of sluice gate system through the PC monitor every drawing time. The simulator can be a very useful tool to design and improve the turning-type sluice gate system.
Development of Real Time Vehicle Dynamics Models for Intelligent Vehicle HILS
Lee, Chang-Ho ; Kim, Sung-Soo ; Jeong, Wan-Hee ; Lee, Sun-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 4, 2006, Pages 199~206
Real time vehicle dynamics models have been developed with the subsystem synthesis method for intelligent vehicle HILS system. Three different models for solving subsystem equations are compared in order to find out the best suitable model for HILS applications. The first model is based on the generalized coordinate partitioning technique, and the second one is on the approximate function approach, and the last one is on the constraint stabilization method. To investigate the theoretical efficiency of three proposed methods, arithmetic operators used in the formulations of three models are counted. Bump run simulations with half-sine bump have also carried out with three different models to measure the actual CPU time to validate theoretical investigation.