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13th International Pacific Conference on Automotive Engineering (2005)
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A Study on Optimized Layout Design of FAS Line Through Production Flow Analysis

Andong National Univ.-Nelson S. Andres, Ram P. Marimuthu, Yong-Gyun Eom, Bong-Choon Jang
  • Technical Paper
  • 2005-03-0150
Published 2005-08-22 by Society of Automotive Engineers of Korea in South Korea
Many mid-sized manufacturing companies in Korean automotive industry have attempted to solve the lack of human power, control the quality of the components, improve the production rate and innovate the manufacturing line. Corresponding to these goals, this study is conceptualized to analyze the production rate of an automotive component manufacturing line using simulation software, construct a Flexible Automation Subassembly (FAS) system and suggest an optimized layout design using FAS line. In this research, the simulation model for manufacturing line was developed and used the realistic data of a medium-sized company in Korea automotive industry. In order to complete this research, a simulation software 'ARENA' was used. The software provided a virtual production model that minimizes the expense and time needed for decision-making in many production tasks. This research analyzed the work distribution strategy and cycle time element for production flow and proposed an optimized layout to resolve line balancing problem which will bring the improved production rate.

Ultrasonic Characterization of Ply-Layup Interface Using CF/Epoxy Composite Laminates Under Before and After Curing Conditions

Chosun Univ.-Je-Woong Park, Do-Jeong Kim, Jae-Ki Sim, Kil-Sung Lee, In-Young Yang
Iowa State Univ.-David K. Hsu, Dong Fei
  • Technical Paper
  • 2005-03-0154
Published 2005-08-22 by Society of Automotive Engineers of Korea in South Korea
The layup orientation of CF (Carbon fiber)/Epoxy composites greatly influences its properties in a composite laminate. A nondestructive technique would be very beneficial, which could be used to test the part before and after curing and requires less time than the optical test. A new method for nondestructively determining the ply layup in a composite laminate is presented. The method employs a normal-incidence longitudinal ultrasound to perform C-scan of ply interfaces of the laminate, and extracts fiber orientation information from the ultrasonic reflection in the laminate. Using two-dimensional spatial Fourier transform, interface C-scan images were transformed into quantitatively angular distribution plots to show the fiber orientation information therein and to determine the orientation of the ply. Also a physical model based on the decomposition and recombination of shear polarization has been adopted for composite laminates fabricated from unidirectional plies. This model was used in the interpretation and prediction of test results. In order to develop these methods into practical inspection tools, a motorized system has been developed for different measurement modalities for acquiring ultrasonic signals…

The Development of the Independent-Type Steer-by-Wire System Using HILS (Second Report)

Hyundai Motor Co.-HeeYoung Jo, MinSeok Kam, UnKoo Lee
  • Technical Paper
  • 2005-03-0221
Published 2005-08-22 by Society of Automotive Engineers of Korea in South Korea
The first report described the logic tuning, the vehicle manufacture and the evaluation in the HILS system for the purpose of the development of a Steer-By-Wire (SBW) system. The second report describes the content of applying to a new HILS system, the vehicle manufacture and the result of the evaluation performed in Independent-type SBW (I-SBW) system. Here, the SBW indicates the method of steering both tires by using one motor as the steering gear actuator, similar to the conventional steering system. On the other hand, the I-SBW means the method of steering both front tires independently by using dual motors as the steering gear actuator. As a result, the layout and the kinematical mechanism of the I-SBW system are quite different from those of the typical steering mechanism. Nevertheless, there is no change in the steering column motor system. In the report, we first describe the structure and control logic of the ISBW system, and then the control effect on this system as applied for both the HILS system and a vehicle. Furthermore, our HILS…

Simultaneous Optimum Design for the Structural and Control Systems of the Pneumatic Servo-Type Active Suspension

Okayama University of Science-Hisashi Matsushita, Shujiro Dohta
  • Technical Paper
  • 2005-03-0225
Published 2005-08-22 by Society of Automotive Engineers of Korea in South Korea
In this paper, we propose the simultaneous optimum design method of structured and control systems for an active suspension using a sensitivity analysis. We deal with an analytical half-car model based on the experimental equipment, which has a pneumatic servo-type active suspension. Control design variables for the optimum design are feedback gains of optimal control and structured design variables are spring constants, viscous damping coefficients, cylinder sectional areas, piston strokes and a wheelbase. We used the steepest descent method as search algorithm. We investigated the performance of the proposed control method from numerical simulations. From some simulation results, we confirmed that the proposed method was useful for the control of the bounding vibration and pitching vibration, compared with the control performance in the case of using the conventional optimal control method that doesn't optimize the structural systems.

Development of Torsional Damper With Crowds of Steel Balls

Shizuoka Univ.-Motohiro Sato, Takashi Matsuda
  • Technical Paper
  • 2005-03-0062
Published 2005-08-22 by Society of Automotive Engineers of Korea in South Korea
In this paper, new torsional damper with crowds of steel balls is developed in order to remove the defects of known dampers and improve the damping performance. The damper is designed and manufactured, and experiments and analyses on the vibration reduction are carried out. As a result, it is clarified that the damper can effectively reduce the torsional vibration of crankshaft system for automobiles by adjusting the mass of balls of the experimental damper. And damping mechanism of the damper is estimated as follows: (1) Friction loss due to sliding on the contacting surfaces between damper mass and balls, and among crowds of balls. (2) Fluctuation of the natural frequency of crankshaft system in every period of the torsional vibration. (3) Hysteresis loss due to the elastic deformation of the contacting surfaces. Further, Modelling and Computer simulation on the torsional vibration of testing crankshaft system with the damper are carried out, and above-mentioned damping mechanisms are quantified as the basis for its optimum design.

Correlation Analysis for Vehicle Duty Cycles and Wheel Bearings

Pusan National Univ.-Hyun-Woo Lee
Pusan National University/ILJIN Global-Jung-Yang Park
  • Technical Paper
  • 2005-03-0066
Published 2005-08-22 by Society of Automotive Engineers of Korea in South Korea
The reliability of vehicle wheel bearing should be guaranteed since the bearing is directly related to driver's safety. Also, the lightweight design of the wheel bearing is important for vehicle performance improvement. In this study, comparison tests were executed to get more practical durability test sequence. A new endurance test sequence was proposed. Load history of a taxi which is used for passenger's transport in Seoul, is selected for the reference driving load sequence. The proposed reference sequence was decided by acceleration test, standard load history generation, and actual durability test results. The comparison test results show that the current standard mode is 1.5 times severe than the proposed driving mode based on endurance test. Therefore, the safety design factor which is referenced by the proposed driving mode is more practical than the current driving mode. The factor of 1.2 is suggested for the Seoul taxi's driving mode.

3D Vision System for the Recognition of Free Parking Site Location

MANDO Corp.-Ho Gi Jung, Dong Suk Kim, Pal Joo Yoon
Yonsei Univ.-Jai Hie Kim
  • Technical Paper
  • 2005-03-0189
Published 2005-08-22 by Society of Automotive Engineers of Korea in South Korea
This paper describes a novel stereo-vision-based localization of free parking site, which recognizes the target position of automatic parking system. Pixel structure classification and feature-based stereo matching extract the 3D information of parking site in real time. The pixel structure represents intensity configuration around a pixel and the feature-based stereo matching uses step-by-step investigation strategy to reduce computational load. This paper considers only parking site divided by marking, which is generally drawn according to relevant standards. Parking site marking is separated by plane surface constraint and is transformed into bird's eye view, on which template matching is performed to determine the location of parking site. Obstacle depth map, which is generated from the disparity of adjacent vehicles, can be used as the guideline of template matching by limiting search range and orientation. Proposed method using both the obstacle depth map and the bird's eye view of parking site marking increases operation speed and robustness to visual noise by effectively limiting search range.

Design and Evaluation of Intelligent Vehicle Cruise Control Systems Using a Vehicle Simulator

Hanyang Univ.-Donghoon Han, Kyongsu Yi
Hyundai Mobis-Jaekwan Lee, Byong Soo Kim
  • Technical Paper
  • 2005-03-0193
Published 2005-08-22 by Society of Automotive Engineers of Korea in South Korea
This paper presents evaluation and comparisons of manual driving and driving with intelligent cruise control (ICC) systems. An intelligent vehicle cruise control strategy has been designed to achieve natural vehicle behavior of the controlled vehicle that would feel comfortable to the human driver and therefore would increase driver acceptance. The evaluation and comparisons of the ICC and manual driving have been conducted using real-world vehicle driving data and an ICC vehicle simulator.

The Experimental Study of Diesel Fuel Injection for Active Regeneration of DPF System

Chungnam National Univ.-Taik-Dong Cho
HYUNDAI MOBIS-Jung-Mo Choi, Jae-Deuk Jo, Young-Hwan You
  • Technical Paper
  • 2005-03-0117
Published 2005-08-22 by Society of Automotive Engineers of Korea in South Korea
The application of after-treatment system has been a necessity according to the reinforcement of exhaust regulation with the rapid growth of vehicles that was applied to diesel-fueled engine. Diesel Particulate Filter (DPF) system was nearly recognized the prior method for reduction of particle matter (PM) but there is one problem that is a regeneration strategy in the low temperature region. In the past, the active regeneration system was complicated, high price, unreliable, so not only regeneration system but also whole DPF system has been doubt about the applying to the vehicle. But a continuous regeneration DPF system has been developed. This system has solved all the problems about complication and unreliability without one which is unsolved problem in low temperature driving condition. In this paper, the evaluation of fuel injection characteristics has been carried out with the third generation, active regeneration DPF system for the decrease of regeneration temperature due to diesel fuel injection. Therefore regeneration temperature and flow uniformity were analyzed in accordance with fuel injection strategy.

The Automotive Suspension Design and Analysis Considering Uncertainties

FRAMAX Co., Ltd.-Byung-Lyul Choi
iDOT-Dong-Hoon Choi
  • Technical Paper
  • 2005-03-0101
Published 2005-08-22 by Society of Automotive Engineers of Korea in South Korea
In this research, the design considering uncertainties and uncertainty analysis are sequentially executed for an automotive suspension system. In the suspension design, random design variables, such as the hardpoint and bushing stiffness, have a great influence on the suspension's performance. In order to analyze the individual effects of the hardpoint and bushing stiffness on the K&C characteristics, the design problem can be considered in three cases. The first case is where the hardpoint is the only random design variable, the second is where only the bushing stiffness is the random design variable and the third is where both are considered random design variables. FRAMAX, a general-purpose, computer-assisted design framework, is used to integrate the design components and execute the optimization and variability analysis. In order to find the most robust design, an efficient reliability-based design optimization algorithm, known as the single-loop-single-vector approach, was utilized. The target reliability level was set to 3-sigma. To estimate the variability or fraction defective, descriptive sampling was applied, often considered to be one of the most efficient sampling methods available.…