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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 12, Issue 6 - Nov 2004
Volume 12, Issue 5 - Sep 2004
Volume 12, Issue 4 - Jul 2004
Volume 12, Issue 3 - May 2004
Volume 12, Issue 2 - Mar 2004
Volume 12, Issue 1 - Jan 2004
Selecting the target year
An Experimental Study on the Effect of Valve Train Design Parameters on the Diesel Engine Valve Rotation
Kim, Do-Joong ; Jeong, Young-Jong ; Lee, Jung-Hee ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 1~8
In this paper we present the effects that valve train design parameters and operating conditions have on the valve rotation properties of a diesel engine. Rotation of intake and exhaust valves are very closely related to the long term durability of diesel engines. of the valves do not rotate even at a rated engine speed, it causes the uneven wear of the valve seat and valve head contact area, which eventually shortens the engine life. Because the rated speed of a diesel engine is relatively lower than that of a gasoline engine, the operating condition of a diesel engine produces tough environment for valve rotation. Therefore, the valve rotation is an important problem which should be solved in the early stage of engine development. In this study, we developed a new technique to measure the valve rotation and shaking motion simultaneously using three proximity sensors. Valve train rotating properties of a diesel engine were measured under various engine operating conditions.
Effect of Injection Parameters on Combustion and Exhaust Emission Characteristics in a Small Common-rail Diesel Engine
Kim, Myung-Yoon ; Lee, Doo-Jin ; Roh, Hyun-Gu ; Lee, Je-Hyung ; Lee, Chang-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 9~15
The characteristics of combustion and emissions were investigated in a single cylinder DI diesel engine equipped with a common rail injection system. This study presents an experimental study of the effect of engine speed, injection timing, injection pressure and pilot injection timing on the combustion and exhaust emissions. The engine speeds were 1000 and 2000rpm and the corresponding injection pressures were 50 and 100MPa. Experimental results show that NOx emissions decrease with retarded injection timing, while HC and CO emissions increases. Higher injection pressure increases NOx with lower soot emissions. For the case with the pilot injection prior to main injection, the ignition delay is shortened and the premixed combustion ratio decreases. Also NOx and soot emissions are decreased with increase of pilot injection advance.
Spray Penetrations of Dimethyl Ether (DME) and Diesel for the Variation of Injection Rate
Choi, Wook ; Lee, Ju-Kwang ; Bae, Choong-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 16~22
Dimethyl Ether (DME) has been considered as one of the most attractive alternative fuels for a compression ignition engine. The major advantage of DME-fuelled engine is a great potential for soot-free combustion without sacrificing an inherent high thermal efficiency of diesel engine, despite a necessity for modification of the conventional fuel injection system. An experimental study on DME and conventional diesel sprays was conducted by employing a common-rail type fuel injection system with a 5-holes sac type nozzle, including a constant volume vessel pressurized with nitrogen gas. The injection rates of DME and diesel fuel were recorded with the Bosch type injection rate meter. The injection delay of DME was shorter than that of diesel fuel. The measured injection rates of DME and diesel fuel were correlated with spray penetrations. The prediction method of spray penetration was established using the injection rates, which was verified with the Dent's penetration model and found to agree well for DME case.
Macroscopic Behavior and Atomization Characteristics of Bio-diesel Fuels
Suh, Hyun-Kyu ; Park, Sung-Wook ; Kwon, Sang-Il ; Lee, Chang-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 23~29
This work was conducted to figure out the atomization characteristics of three types of bio-diesel fuels using a common-rail injection system. The process of spray development was visualized by using a spray visualization system composed of a Nd:YAG laser and an ICCD camera, The spray tip penetrations were analyzed based on the frozen images from the spray visualization system. On the other hand, the microscopic atomization characteristics such as the distributions of SMD and axial mean velocity were measured by using a phase Doppler particle analyzer system, It is revealed that the sprays of the bio-diesel fuels have larger SMD than that of diesel fuel mainly due to high viscosity of bio-diesel. Different characteristics of bio-diesel fuels were also measured in spray tip penetrations according to the fuels and mixing ration.
Combustion Characteristics of Dimethyl Ether (DME) and Diesel Fuel Using a Common-rail Fuel Injection System
Choi, Wook ; Lee, Ju-Kwang ; Bae, Choong-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 30~37
The combustion and emission characteristics of a direct injection CI engine fuelled with DME(Dimethyl Ether) and diesel fuel were compared at idle engine speed(800 rpm) with various injection parameters. An optical single cylinder diesel engine equipped with a common-rail fuel injection system was constructed to investigate combustion processes of DME and diesel fuel. The combustion images were recorded with a high-speed video camera system. The results demonstrated that the DME-fuelled engine was superior to the conventional diesel engine in terms of engine performance and emissions. The optimal injection timing of DME was located around IDC(Top Dead Center), which was roughly same as that of diesel fuel. As the injection timing was advanced much earlier than TDC, NOx (Nitric Oxides) level increased considerably. NOx emission of DME was equal or a little higher than that for diesel fuel at the same injection pressure and timing because of higher evaporation characteristics of DME. Throughout all experimental conditions, DME did not produce any measurable smoke level.
A Study on the Effects of Intake Port Geometry on In-Cylinder Swirl Flow Field in a Small D.I. Diesel Engine
Lee, Ki-Hyung ; Han, Yong-Taek ; Jeong, Hae-Young ; Leem, Young-Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 38~45
This paper studies the effects of intake port configuration on the swirl that is key parameter in the flow field of direct injection diesel engines. In-cylinder flow characteristics is known to have significant effects on fuel air mixing, combustion and emissions. To investigate the swirl flow generated by various intake ports, steady state flow tests were conducted to evaluate the swirl. Helical port geometry, SCV shape and bypass were selected as the design parameters to increase the swirl flow and parametric study was performed to choose the optimal port shape that would generate a high swirl ratio efficiently. The results revealed that a key factor in generating a high swirl ratio was to suitably control the direction of the intake air flow passing through the valve seat. For these purposes, we changed the distance of helical and tangential port as well as installed bypass near the valve seat and the effects of intake port geometry on in-cylinder flow field were visualized by a laser sheet visualization method. From the experimental results, we found that the swirl ratio and mass flow rate had a trade off relation. In addition, the result indicates that the bypass is a effective method to increase the swirl ratio without sacrificing mass flow rate.
A Study on the Comparison of the Combustion Characteristics between a Small HSDI and an IDI Diesel Engine by Advanced One-zone Heat Release Analysis
Lee, Suk-Young ; Jeong, Ku-Seop ; Jeon, Chung-Hwan ; Jang, Young-June ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 46~53
Heat release analysis is a very important method for understanding the combustion phenomena inside an engine cylinder. In this study, one-zone heat release analysis was used with the measured cylinder pressures of a HSDI(high speed direct injection) and IDI(indirect injection) diesel engines, Those have benefits of simple equation, fast speed, reliability. The objective of the study is to compare the combustion characteristics between a HSDI and an IDI. The result shoes that the maximum heat release rate of a HSDI is higher than that of an IDI because of long ignition delay period. The heat release curve of an IDI is more linear than that of a HSDI, thus is similiar to that of a SI engine. The combustion efficiency of a HSDI is higher than that of an IDI because of the smaller heat transfer loss of a HSDI. There is a suggestion here that an IDI engine has broad heat transfer area which include two combustion chambers, the connection passage of combustion chambers, etc.
An Experimental Study on Durability Performance of Aluminum Alloy Piston and Steel Forging Piston
Kim, Hyun-Chul ; Lee, Jong-In ; Park, Jong-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 54~59
The goal of this research is to confirm reliable durability and evaluate the engine performance of the current aluminum alloy piston and the newly developed steel forging piston. For such purpose, the test environment was built with 2.91 target engine mounted on the engine dynamometer and additional exhaust gas analysis system. Using the test environment, engine performance test was conducted, and durability test was also conducted using a dedicated piston durability test equipment for 400,000 km. As a result of the experiment, similar durability was appeared for both aluminum piston and steel piston, and the engine output power and torque are slightly reduced because of
heavier weight of the steel piston compare to the aluminum alloy piston.
The Optimization of Fuel Injection Nozzles for the Reduction of NOx Emissions in a Large Diesel Engine
Yoon, Wook-Hyeon ; Kim, Byung-Seok ; Kim, Dong-Hun ; Kim, Ki-Doo ; Ha, Ji-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 60~65
Numerical simulations and experiments have been carried out to investigate the effect of fuel injection nozzles on the combustion and NOx formation processes in a medium-speed marine diesel engine. Spray visualization experiment was performed in the constant-volume high-pressure chamber to verify the numerical results on the spray characteristics such as spray angle and spray tip penetration. Time-resolved spray behaviors were captured by high-speed digital camera and analyzed to extract the information on the spray parameters. Spray and combustion phenomena were examined numerically using FIRE code. Wave breakup and Zeldovich models were adopted to describe the atomization characteristics and NOx formation processes. Numerical results were verified with experimental data such as cylinder pressure, heat release rate and NOx emission. Finally, the effects of fuel injection nozzles on the engine performance were investigated numerically to find the optimum nozzle parameters such as fuel injection angle, nozzle hole diameter and number of nozzle holes. From this study, the optimum fuel injection nozzle (nozzle hole diameter, 0.32 mm, number of nozzle holes, 8 and fuel injection angle,
) was selected to reduce both the fuel consumption and NOx emission. The reason for this selection could be explained from the highest fuel-air mixing in the early phase of injection due to the longest spray tip penetration and the highest heat release rate after
ATDC due to the increased injection duration.
A Study on the Diesel DI-HCCI Combustion Characteristics using 2-stage Injection Method
Chung, Jae-Woo ; Kang, Jung-Ho ; Kim, Byoung-Soo ; Kang, Woo ; Kim, Hyun-Chul ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 66~73
In this study, combustion characteristics and various performances of a Diesel fuel DI-HCCI engine using 2-stage injection method were investigated. From these researches, application ability of 2-stage injection strategy to a DI-HCCI engine was confirmed and improvement methods of performances were considered. As the results, Using 2-stage injection method, without change of engine specifications and loss of IMEP, exhaust of NOx and Smoke emissions could be reduced to about 1/3 (at 1400rpm, IMEP 6bar) compared to conventional Diesel combustion.
Analysis on the Structure of Evaporative Diesel Spray by Using PIV Technique
Yeom, Jeong-Kuk ; Chung, Sung-Sik ; Ha, Jong-Yul ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 74~79
The effects of change in injection pressure on spray structure have been investigated in high temperature and pressure field. To analyze the structure of evaporative diesel spray is important in speculation of mixture formation process. Also emissions of diesel engines can be controlled by the analyzed results. Therefore, this study examines the evaporating spray structure by using a constant volume vessel. The injection pressure is selected as the experimental parameter, is changed from 72 MPa to 112 MPa with a high pressure injection system(ECD-U2). The PIV(Particle Image Velocimetry) technique was used to capture flow variation of the evaporative diesel spray. A study on the mixture formation process of diesel spray was executed by the results of flow analysis in this study. Consequentially the large-scale vortex flow could be found in downstream spray and the formed vortex governs the mixture formation process in diesel spray.
A Study on the Combustion and Exhaust Gas Characteristics of Single Cylinder Engine for DME and Diesel
Kim, Hyun-Chul ; Kang, Woo ; Kim, Byoung-Soo ; Park, Sang-Hoon ; Chung, Jae-Woo ; Park, Jong-Ho ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 80~89
In order to confront the increasing air pollution and the tightening emission restrictions, this research developed a diesel engine using DME, the advanced smoke-free alternative fuel. By numerical analysis, flow field, spray, and combustion phenomenon of the DME engine was presented. Using an experimental method, the configuration of the fuel supply system and operation/power performance was tested with the current plunger pump. Most emission performance, especially smoke performance was significantly improved. The possibility of conversion from the current diesel engine into the DME engine was affirmed in this research. However, it was found that the increase of engine RPM and fuel amount need to be properly adjusted through matching the characteristics of fuel and injector for further improvement.
Crankshaft Bearing Design Adapting Discontinuous Oil Supply System
Yun, Jeong-Eui ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 90~95
In this study, for the crankshaft bearing design adapting discontinuous oil supply system, analyses were conducted to determine the lubrication characteristics such as oil flow rate and increase of oil temperature at main bearing and connecting rod bearing. Additionally, supplied oil pressure and temperature effects on the bearings were simulated to figure out lubrication characteristics on the bearings. Finally the effects of increasing the bearing width and clearance were introduced on the lubrication characteristics.
A Study on the Characteristics of DPF Regeneration Process of Peugeot 406 Vehicle Engine
Kim, Chang-Il ; Baek, Choong-Hyun ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 96~102
The diesel particulate filter(DPF) is effective for particulate removal from diesel engine under a variety of conditions, and then the regeneration strategies is very important in the aspects of engine fuel consumption and engine durability. This paper addresses the changes of Peugeot 406 vehicle engine parameters(fuel injection timing, period, rail pressure, emissions exhaust temperature so on) during DPF regeneration. additionally, checked the soot loading mass with mileage and the change of fuel consumption and performance with ash accumulation.
PIV Analysis of the External Flow Field of Front End Cooling Pack System
Heo, Hyung-Seok ; Han, Chang-Pyung ; Park, Kyoung-Suk ; Lee, Gee-Soo ; Bae, Suk-Jung ; Won, Jong-Phil ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 103~110
The major trend in global automotive market is changing drastically in the way that a vehicle FECPS(Front End Cooling Pack System) is designed and manufactured as an assembly part. The system can encompass many functions, be assembled into a vehicle as a module, and reduce the production cost as well as time. The FECPS consists of an impact beam, an aluminum condenser and a radiator, a carrier and a cooling fan with a BLDC motor. In order to predict the performance of a FECPS accurately, it is essential to properly model the air flow field through various heat exchangers, such as a condenser or a radiator. In this study, the flow field of the system is measured by a PIV(Particle Image Velocimetry) system. The result is compared with that measured with multi-channel anemometer.
Effect of Tunnel Entrance Shape of High Speed Train on Aerodynamic Characteristics and Entry Compression Wave
Jeong, Soo-Jin ; Kim, Woo-Seung ; Zhu, Ming ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 111~118
The work presented in this paper concerns the aerodynamic characteristics and compression wave generated in a tunnel when a high speed train enters it. A large number of solutions have been proposed to reduce the amplitude of the pressure gradient in tunnels and some of the most efficient solutions consist of (a) addition ofa blind hood, (b) addition of inclined part at the entrance, and (c) holes in the ceiling of the tunnel. These are numerically studied by using the three-dimensional unsteady compressible Euler equation solver with ALE, CFD code, based on FEM method. Computational results showed that the smaller inclined angle leads to the lower pressure gradient of compression wave front. This study indicated that the most efficient slant angle is in the range from
. The maximum pressure gradient is reduced by
for the inclined angle of
as compared to vertical entry. Results also showed that maximum pressure gradient can be reduced by
in blind hood entry as compared to
inclined tunnel entry. Furthermore, the present analysis showed that inclined slant angle has little effect on aerodynamic drag. Comparison of the pressure gradient between the inclined tunnel hood and the vertical entry with air vent holes indicated that the optimum inclined tunnel hood is much more effective way in reducing pressure gradient and increasing the pressure rise time.
Observation on Double-droplet Combustion Speed in Premixed Spray Flame
Lee, Chi-Woo ; Shim, Han-Sub ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 119~126
In order to elucidate the modes of double-droplet combustion speed in premixed spray flame, the difference between flame propagation speed and droplet cluster disappearance speed are experimentally investigated using a premixed spray burner system, It was confirmed that flame speed concerned with premixed-mode combustion in the spray flame was approximately 2.0 m/s in average while mean disappearance speed of droplet clusters, which were dominated by diffusion-mode combustion in downstream of the flame, was evaluated as much as 0.45 m/s. It was clarified that both characteristics of premixed-mode and diffusion-mode combustion in spray flames are of much difference in nature, even though both speed, which are supposed to depend on local properties of the spray itself and flow conditions surrounding droplet clusters, are scattered in experiments.
Numerical Analysis of Combustion Characteristics during Combustion Mode Change of a Low NOx Utility Gas Turbine
Jeong, Jai-Mo ; Chung, Jae-Hwa ; Park, Jung-Kyu ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 127~134
Three-dimensional numerical investigations are carried out to understand the combustion characteristics inside a DLN(dry low NOx) utility gas turbine combustor during the combustion mode change period by applying transient fuel flow rates in fuel supply system as numerical boundary conditions. The numerical solution domain comprises the complex combustor liner including cooling air holes, three types of fuel nozzles, a swirl vane, and a venturi. Detailed three-dimensional flow and temperature fields before and after combustion mode changeover have been analyzed. The results may be useful for further studies on the unfavorable phenomena, such as flashback or thermal damage of combustor parts when the combustion mode changes.
Design of Occupant Protection Systems Using Global Optimization
Jeon, Sang-Ki ; Park, Gyung-Jin ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 135~142
The severe frontal crash tests are NCAP with belted occupant at 35mph and FMVSS 208 with unbelted occupant at 25mph, This paper describes the design process of occupant protection systems, airbag and seat belt, under the two tests. In this study, NCAP simulations are performed by Monte Carlo search method and cluster analysis. The Monte Carlo search method is a global optimization technique and requires execution of a series of deterministic analyses, The procedure is as follows. 1) Define the region of interest 2) Perform Monte Carlo simulation with uniform distribution 3) Transform output to obtain points grouped around the local minima 4) Perform cluster analysis to obtain groups that are close to each other 5) Define the several feasible design ranges. The several feasible designs are acquired and checked under FMVSS 208 simulation with unbelted occupant at 25mph.
Nondestructive Test of Optical Connector by Resonant Ultrasound Spectroscopy Method
Kim, Sung-Hoon ; Lee, Kil-Sung ; Kim, Dong-Sik ; Kim, Young-Nam ; Jeong, Sang-Hwa ; Yang, In-Young ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 143~150
In this paper, resonant ultrasound spectroscopy(RUS) was used to determine the natural frequency of a ceramic ferrule and a ball lens. The ceramic ferrules are cylinderical shape with
2.56mm diameter and l0mm in length. Crack lengths of these ferrules are 10.40
m and 32.35
m. The spherical ball lens was made of BK-7 glass, one's diameter in 2mm and 5mm. RUS system is consisted of spectrum analyzer, power amplifier, PZT sensor and support frame. The principle of RUS is that the mechanical resonant frequency of the materials depends on density and the coefficient of elasticity. Rus system is based on that given resonant frequency of the materials can be represented by the function of density and the coefficient of elasticity, and it is applied to excite specimen and to inspect the difference of natural frequency pattern between acceptable specimen and defective ones. Defect evaluation by RUS are performed to investigate the natural frequency measure of ferrule and ball lens.
Magnetic Abrasive Polishing for Internal Face of Seamless Stainless Steel Tube Using Sludge Abrasive Grain
Kim, Hee-Nam ; Yun, Yeo-Kwon ; Kim, Sang-Baek ; Choi, Hee-Sung ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 151~157
In this paper deals with behavior of the magnetic abrasive using sludge on polishing characteristics in a new internal finishing of seamless stainless steel tube applying magnetic abrasive polishing. The magnetic abrasive using sludge-abrasive grain WA and GC used to resin bond fabricated low temperature. And sludge of magnetic abrasive powder fabricated that sludge was crused into 200 mesh. The previous research have made an experiment in the static state the movement of magnetic abrasive grain is nevertheless in the dynamic state. In this paper, We could have investigated into the changes of the movement of magnetic abrasive grain. In reference to this result, we could have made the experiment which is set under the condition of the magnetic flux density, polishing velocity according to the form of magnetic brush.
A Study on Noise Reduction of a Fan DC Motor in a Vehicle using FEM
Jung, Il-Ho ; Seo, Jong-Hwi ; Park, Tae-Won ; Kim, Joo-Yong ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 158~165
The DC motor in a vehicle may cause noise and vibration because of high speed revolution, which can make a driver feel uncomfortable. There have been various studies attempting to solve these problems, focusing mostly on the causes of and ways to reduce noise and vibration. It is suggested that the noise in a DC motor may be primarily due to interaction between a brush and a commutator. Brush noise, the most common noise in a DC motor, results from a brush bounced from the surface of the commutator, fluctuation of the friction between the brush and the commutator, and the impact on the brush when passing over slots of the commutator. Based on the noise test, one of the most important design parameters was shown to be the roundness of the commutator. As the DC motor is used, the roundness of the commutator gets bigger with subsequent increase of the level of brush noise and vibration. There must be a threshold in order to prevent the brush noise from getting worse. Using the method of CAE is more efficient than the real test for purposes of looking for various design parameters to maintain the roundness of the commutator. In this study, the design process to reduce the brush noise is presented with the use of a computer model. The design parameters to reduce the brush noise and vibration are proposed by using FEM. The design parameters are used to reduce the noise and vibration of a DC motor and it is verified with the test results on a fan DC motor in a vehicle. This method may be applicable to various DC motor.
A Study on the Control System of the Narrow Vehicles for Improvement of Maneuvering under Emergency Situation
So, Sang-Gyun ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 166~174
In urban area narrow commuter vehicles have attracted interest as a possible solution to reduce traffic congestion and parking problems. However, a narrow vehicle has an increased to overturn during hard cornering when compared to conventional vehicles. This tendency can be reduced by tilting it toward the inside of the turn. Two types of automatic tilting control systems which are Direct Tilt Control(DTC) and Steering Tilt Control(STC) have been developed. In this paper as one of the technique to improve the handling performance for the unusual vehicle the control system which blends both the DTC and the STC system is considered. It uses the merits of both the DTC and the STC system. As a control strategy for combination the switching control method is used. Finally, the fact that the unusual vehicle is safe under an emergency situation such as slippery road surface is proved by computer simulation.
Analysis on the Dynamic Characteristics of Power Transmission System Using Multi-body Dynamics
Woo, Min-Soo ; Kong, Jin-Hyung ; Lim, Won-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 175~181
This paper presents the main method to analyze the dynamic characteristics of power transmission system using the multi-body dynamics, which is based on the concept of subsystem equation, subsystem assembling, and the self-determination technique for the system degree of freedom. We can model the mechanical components of power transmission system easily with the advantage of multi-body dynamics. Based on the theory, a dynamic simulation program was developed to analyze system performances, transient phenomena, and other dynamic problems. The driving performance of automatic transmission was simulated with using the multi-body dynamics and Newtonian method, and the validity of program was proved by comparing the two kinds of result.
Compensation of Errors on Car Black Box Records and Trajectory Reconstruction Analysis
Yang, Kyoung-Soo ; Lee, Won-Hee ; Han, In-Hwan ;
Transactions of the Korean Society of Automotive Engineers, volume 12, issue 6, 2004, Pages 182~190
This paper presents reconstruction analysis of vehicle trajectory using records of a developed black box, and results of validation tests. For reconstruction of vehicle trajectory, the black box records the longitudinal and lateral accelerations and yaw-rate of vehicle during a pre-defined time period before and after the accident. One 2-axis accelerometer is used for measuring accelerations, and one vibrating structure type gyroscope is used for measuring yaw-rate of vehicle. The vehicle's planar trajectory can be reconstructed by integrating twice accelerations along longitudinal and lateral directions with yaw-rate values. However, there may be many kinds of errors in sensor measurements. The causes of errors are as follows: mis-alignment, low frequency offset drift, high frequency noise, and projecting 3-dimensional motion into 2-dimensional motion. Therefore, some procedures are taken for error compensation. In order to evaluate the reliability and the accuracy of trajectory reconstruction results, the black box was mounted on a passenger car. The vehicle was driven and tested along various specified lanes. Through the tests, the accuracy and usefulness of the reconstruction analysis have been validated.