• Title/Summary/Keyword: automobiles

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Vehicle Dynamics Control Applications to Automobiles: Survey and Some New Trends (차량 제어 기술 및 선진 연구 동향)

  • Yi, Kyong-Su;Lee, Jun-Yung
    • Journal of Institute of Control, Robotics and Systems
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    • v.20 no.3
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    • pp.298-312
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    • 2014
  • This paper describes control applications in automobiles. Many aspects of automotive applications of advanced control methods, which include suspension systems, stability control systems, engines, hybrid vehicle control systems, electric vehicle controls systems, advanced driver assistance systems and automated driving control systems, are reviewed. The control methods used in each area are briefly reviewed to help readers understand the applicability and effectiveness of these methods. In addition, some new trends in the research of automotive applications are described.

Lamb Wave Inspection for Crack Detection in Coil Spring of Automobile Suspension System (자동차 현가 장치용 스프링의 신뢰성 평가를 위한 Lamb Wave 크랙검사)

  • 문병준;김노유
    • Proceedings of the Korean Reliability Society Conference
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    • 2002.06a
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    • pp.227-233
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    • 2002
  • Suspension system is one of the most important components indespensible for stability and reliability of automobiles. The demands to more safe and durable suspension system have been increased as the automobiles get popular and improve in quality. The crack in the coil spring of the suspension system produced during manufacturing may grow under a fatigue load and cause a severe safety problems which lead to a catastrophic damage to the passengers. Many conventional NDT techniques including ET, RT, and UT are less sensitive or hard to apply to detect the surface breaking crack in the suspension coils partly because the techniques are point-to-point measurement methods, thus take too long time to inspect the coil spring longer than 1m. Contrary to this, Lamb wave technique is full-field measurement method that make it possible to examine the whole coil spring in real time. In this paper, the Lamb wave is applied to the coil spring to investigate the possibility to detect the cracks on the surface of the coil spring.

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A Study on the Development for Automobile Registration Statistics System for After Service (자동차의 사후관리를 위한 등록통계 시스템 개발에 관한 연구)

  • 강지호
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.17 no.32
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    • pp.267-279
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    • 1994
  • The Ministry of Transportation forecasts that the total number of automobiles in use in 1997 will be increased to about 10 million units. Until now, with the increase of domestic demand for automobiles, the customers' complaints have been raised frequently in relation with insufficient supply of auto parts for the repair and maintenance. At the same time, the industry came to face with new problems such as customers' requests of auto makers' quality services. Until now there were not any statistics on the registration of car age for each car type. So, for the auto makers' efficient aftersales management a system for collecting registration statistics was developed, and it has attributed remarkably to the improvement of the aftersales services, through easy anticipation of the requirements of parts being used for not only the small-produced but the massproduced car types. And a systematic instrument useful for auto industry, transportation and policy on environment is provided by timely supply of various statistics to the industry.

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Mass-production of WS$_2$ Solid Lubricant and Its applications (WS$_2$ 고체윤활제의 양산 및 적용)

  • 신동우;최인혁;윤대현;김경도
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1998.10a
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    • pp.221-226
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    • 1998
  • The processing conditions for the mass production of platelet WS$_2$ lubricant powder were optimized. The mixture of tungsten and sulfur powders was sealed in a vacuum of 10$^{-3}$ torr and heat-treated at 850$\circ$C for 2 h. The internal pressure of reaction chamber was maintained at certain level by controlling the release valve automatically. The reaction product was the platelet WS$_2$ powder with an average size of 15 $\mu$m. The synthesized WS$_2$ powder was then coated on the wiper-blade of automobiles and the commercial deep-grooved ball bearing using wet and dry coating methods, respectively. High lubricity and wear resistance of wet coated wiper-blade were confirmed by the life test of 70,000 cycles. The life-time of the ball bearing assembled after WS$_2$ coating onto each part increased 50 times compared to the non-coated ball bearing.

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Design and Manufacturing of Composite Drive Shaft for Automobiles (자동차용 복합재료 드라이브샤프트 설계 및 성형 연구)

  • Kim, T.W.;Lee, S.K;Jun, E.J.;Kim, W.D.;Lee, D.G.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.1 no.3
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    • pp.109-117
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    • 1993
  • A carbon/epoxy composite drive shaft used for the power transmission of the automobiles with steel joints. Compared with the metallic drive shaft, the composite one has the weight saving of 50% with equivalent torsional strength and fatigue characteristics. In this study, the filament winding technique for the composite tube and composite/metal joining technique are estabilished. The performance test of the drive shaft is carried out. The optimal condition of the surface roughness of the steel adherend was $1.5{{\mu}m}$ to $2.5{{\mu}m}$, and the optimal condition of the bonding thickness was 0.15mm. Maximum torque and torsional stiffness of the composite drive shaft manufactured by filament winding process were found to be $210kg{\cdot}m$ and $18.5kg{\cdot}m/deg$, respectively.

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Premature Failure of Deep Grooved Ball Bearing for Automobiles : Part 1 - A Failure Mechanism (자동차용 깊은홈 볼베어링의 조기파손 : 1보 - 파손기구의 규명)

  • Hyun Joons;Park Tae Jo
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2003.11a
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    • pp.388-394
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    • 2003
  • This paper deals with a premature failure mechanism of deep grooved ball bearing for automobiles. A close examination of used bearings revealed that the premature failure could be arose by dents on the ball. Universal testing machine with specially designed tools is used to simulate the practical dents on the ball and test bearings are assembled with dented balls and new hearing components. The endurance test results showed that the dents on the balls were printed on the races and these phenomena come to premature failure.

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Premature Failure of Deep Grooved Ball Bearing for Automobiles : Part 2 - Critical Dent Size (자동차용 깊은홈 볼베어링의 조기파손 : 2보 - 임계압흔의 크기)

  • Hyun Joons;Park Tae Jo
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2003.11a
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    • pp.395-401
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    • 2003
  • In this paper, the dent printing phenomena and critical dent size which lead to premature failure of deep grooved ball bearing for automobiles are presented. The results of newly assembled test bearings showed that the ball dent size strongly affect the bearing life and inner ring raceways were the major failed parts in spite of using the dented balls. The dent printing phenomena are a root cause of premature failure, which was not reported until now. And there exist the critical ball dent size for given rolling bearings and operating conditions. So, the initial condition of tribologically mating parts should be treated as important as the failed body itself.

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A Study on the Collapse Characteristics of Thin-walled Structural Members for Automobiles Under Axial Compression Load (차체구조용 박육부재의 압궤특성에 관한 연구)

  • 김정호;임성훈;양인영
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.3
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    • pp.1-14
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    • 1997
  • In this paper, collapse test of thin-walled structural member widely used for automobiles is carried out under static compression load to observe the effects of cross- sectional shape and material on the energy absorbing capacity in the viewpoint of cras- hworthiness. Specimens tested consist of two sorts(Aluminium, CFRP) and configur- ations(Circular, Square) with variation in thickness. Also, comparisons of Al circular and square specimens are made to find the influence of difference in shape on the energy absorbing capability according as the thickness of specimen varies.

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Analysis of Electro-magnetic Interference Noise for Eco-friendly Vehicle (친환경 자동차의 전자파 방사 노이즈 특성 분석)

  • Kim, Hae-Sung;Yong, Boo-Joong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.6
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    • pp.76-81
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    • 2011
  • Fossil fuel, the energy source of internal combustion engine automobiles, is limited in resource and has caused environmental issues for decades. Accordingly, automobile manufacturers from many countries around the world are developing or producing eco-friendly vehicles that utilize alternative sources of energy. These vehicles are equipped with many electronic and electrical components which operate on high voltage and/or large current that were not used in conventional combustion engine automobiles. In this paper, in order to analyze the electro-magnetic interference noise, electric vehicles and fuel cell electric vehicles are tested under the guidelines of KMVSS (Korean Motor Vehicle Safety Standards) as well as under test modes that are not stipulated under the guidelines.

Influence of Stacking Condition on Collision Safety of CFRP Side Member (적층구성이 CFRP 사이드 부재의 충돌안전성에 미치는 영향)

  • Hwang, Woo Chae;Yang, In Young
    • Journal of the Korean Society of Safety
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    • v.29 no.3
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    • pp.14-19
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    • 2014
  • The global demand for reduction in the weight of automobiles has led many countries to focus on the development of hybrid, eco-friendly, and electric cars. Reduction in the weight of materials can both increase fuel efficiency and maximize automobile performance. Therefore, the design of automobile should be inclined towards the safety aspects. but at the same time, it also consider reducing the structural weight of an automobile. In this study, CFRP side members with circular and double hat shaped section was manufactured. The impact collapse tests performed with change of the stacking condition, such as variation of interface number and outerlayer angle. The impact collapse load and absorbed energy were quantitatively analyzed according to the changes in section shapes and stacking condition. This analysis was performed to obtain design data that can be applied in the development of optimum lightweight members for automobiles.