• Title/Summary/Keyword: automotive seat

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A Study of Valve-train Life Time Estimate in Engine Durability Test (2) (엔진내구시험을 통한 Valve Train 수명예측에 관한 연구 (2))

  • Kim, Jaejin;Lee, Hwanhui;Myung, Wanghee;Min, Byengdu
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.3
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    • pp.75-80
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    • 2014
  • In previous study, make an attempt to estimate exhaust valve seat and seat-ring wear acceleration factor for engine durability test with measuring and consideration of wear mechanism. But found abnormal initial wear rate in exhaust valve seat-ring. And have to improve exhaust valve seat-ring wear rate for reliability reason, because next GDI/Turbo engine is based on this engine and GDI/Turbo engine have higher combustion pressure and higher thermal load. In this study, Trying to find the cause of abnormal wear factor, improve valve-train durability by change specification & design of parts and verify variant parts for improving durability of valve-train. And then I would like to propose a design guide line of valve-train system in a reliability point of view, besides make a complement of previous study.

The Effects of the Intake Value Type on the Intake Flow(I) -The Axial Velocity Distribution by the Model- (흡입밸브 형상이 흡입유동에 미치는 영향(I) -모델에 의한 축방향속도분포-)

  • 하대진;박경석
    • Journal of the korean Society of Automotive Engineers
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    • v.11 no.6
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    • pp.57-67
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    • 1989
  • This paper deals with the experimental study of the turbulent flow fields by the hot-wire anemometer and the density fields by the Schlieren photography. In this study, the air mixed with CO$_{2}$ was used to visualize and to study this process and experimental parameters used were valve lift and valve shape. The results obtained are as follows: 1) The axial velocity of mixture flow passing a valve is changed greatly by valve seat angle and valve lift. Especially, it is changed more when the valve seat angles is 30.deg. and 45.deg. than when these are 60.deg. and 90.deg. 2) Experimental results by hot wire anemometer and Schlieren apparatus are very close together. The most satisfactory results are shown when the valve seat angle is 45.deg.

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An Application of Sliding Horizon Control to an Electro- Hydraulic Automotive Seat Simulator

  • Mo, Changki;Sunwoo, Myoungho;Yan, Wenzhen
    • Journal of Mechanical Science and Technology
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    • v.16 no.3
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    • pp.283-291
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    • 2002
  • The paper demonstrates the tracking performance of a sliding horizon feedback/feedforward preview optimal control when applied to a hydraulic motion simulator which has been built to provide a means of replicating the actual ride dynamics of an automobile seat/human system. The design was developed by solving an ordinary differential equation problem instead of a Ricatti equation. Simulation results indicate that the proposed technique has good performance improvement in phase tracking when compared to the classical design methods. It is also found that the controller can be adjusted more easily for robustness due to more tuning parameters.

Structural Analysis and Evaluation Technologies of Automotive Seat Frames (자동차 시트 프레임의 강도설계 및 평가기술 개발)

  • Woo, C.S.;Koo, J.S.;Cho, H.J.;Kim, H.S.;Jeong, J.H.
    • Proceedings of the KSME Conference
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    • 2001.06a
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    • pp.806-811
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    • 2001
  • To develop design and evaluation technologies of automotive seat frames, structural analysis and fatigue tests have been performed. Under the back moment loading condition, the numerical simulation yielded the maximum stress over the yield strength at the side frame bracket. To measure the stresses under the test condition, strain gauges were attached on some weakest points of the side frames. the measured strains are in good agreements with the CAE results. On the other hand, fatigue tests have been performed using the side frame bracket specimens made of various welding types to estimate their durabilities. From the fatigue test results and the analysis ones, it was recommended that the welding position of the bracket should be moved upward.

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A Study on the Structural Design of a Seat frame in Automotive Vehicles (승용차 시트프레임의 구조설계에 관한 연구)

  • 김홍건;조영태;최금호;이병휘
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1999.05a
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    • pp.159-163
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    • 1999
  • A seat frame structure in automotive vehicles made of polymer matrix composite to achieve weight reduction at low cost was developed. In order to design and manufacture the actual product, studies on material selection, and structural analyses were performed. Structural analyses were performed with a finite element analysis. Analyses were done for several cases suggested in various safety regulations of FMVSS(Federal Motor Vehicle Safety Standards). Each result was utilized to modify the actual shape to obtain a lighter, safer and more stable design. The final design was used to produce a sample bottom plate of the seat structure. Substitution of the material resulted in a weight reduction effect with equivalent strength, fatigue and impact characteristics. Furthermore, several effects from the replacement of the material besides weight reduction were also examined.

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A Study on Characterizing a Healthy Driving Posture (건강한 운전 자세 특성 연구)

  • Kim, Darae;Choi, Hyungyun;Lee, Joungho;Ahn, Sungmin;Lee, Shiuk
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.5
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    • pp.121-129
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    • 2013
  • To find a healthy driving posture, in this study, survey and empirical analysis given onto measurement of car-seat angle has been performed. Among 153 male respondents, those drivers who has minimum 5 year experience and 2 hours daily driving has been selected by a multiple screening process. They were further confirmed to have no discomfort history in any body region caused by the driving task. Final 44 people verified that their actual driving posture is not significantly different (p = 0.692) from healthy one they think. And their data, accordingly, the healthy driving postures are clustered based on the same seat-cushion angle, seat-back angle and trunk-thigh angle. Consequently, three seat-angles of the 44 subjects showed a significant difference only with their height information which is the most effecting factor on driving posture among the physical characteristics. That is a first result categorized healthy driving posture classified physical, if it were departmentalized into additional study, could be able to reflected a factor of "healthy" on car seat design.

Convergence Study on Durability Analysis of Scooter Seat (스쿠터 시트의 내구성 해석에 관한 융합 연구)

  • Oh, Bum-Suk;Cho, Jae-Ung
    • Journal of the Korea Convergence Society
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    • v.10 no.6
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    • pp.165-170
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    • 2019
  • This study carried out the structural analysis and vibration analysis on scooter seat. By comparing with three kinds of B-bone A, Julio B, and City Ace C, the load was applied to scooter seat as much as a weight of person. Through structural analysis, this study examined which seat is most deformed by comparing the deformation each other or affords passengers most convenience and does not afford passengers the inconvenience by absorbing the vibration during driving. Model C has the most total deformation at the structural analysis result and Model B is seen to be changed to be convenient to sit the deformation as it deforms largely. Through this study, which seat is most convenient and becomes strong on durability can be confirmed. As the durability analysis result data of scooter seat model obtained on the basis of this study result are utilized, the esthetic sense can be shown by being grafted onto the machine or structure at real life.

The Study on a Biomechanical Model for Automotive Seat Design (자동차 SEAT DESIGN을 위한 BIOMECHANICAL MODEL 연구)

  • 신학수;최출헌
    • Proceedings of the ESK Conference
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    • 1998.04a
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    • pp.149-154
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    • 1998
  • The design of seat is maintaining to final stable posture. The final stable posture is the seated posture in which the force of the pad and spring supporting the body is balanced with the body weight and the bodydoes not sink anyfurther intothe seat. With poorly designed seated seats, your behind maygradually move forward, or localized pressure may result in congestion of the blood or numbness, making you want to move. Therefore, the final stable posture is not maintained. A number of ideas were used in this study will eliminate this problem. In automobile seat design, primary attention has forcused on providing the occupant with a comfortable seat that has sufficient padding and adjuxtments toaccomodate different sizes and postures of people. First of all, whether the process is design-oriented or technology-oriented, the design concept must be human-oriented. The fatigue-alleviating seats which were the primary purpose of this research were studied with a human-oriented approach.

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RFID-based Verification System and Method for Improving Quality of a Automotive Seat Assembly Line (자동차 시트 조립공정에서의 품질 향상을 위한 RFID기반 검증시스템 및 방법)

  • Kim, Heejin;Choi, Byoungju;Park, Chanmok
    • Journal of Information Technology Services
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    • v.12 no.4
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    • pp.175-186
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    • 2013
  • Among many automotive manufacturing processes, an assembly process has the smallest automatization percentage. As the correct assembly of the supplied components according to its specification is directly related with the quality of the final product, it is of the utmost importance to reduce the possible human errors in the assembly line. However, due to the lack of an effective verification system for an assembly line, currently, there is huge cost loss caused by the errors in seat assembly every year. Therefore, in this paper, to overcome the limit of the current verification method and to prevent the occurrence of assembly errors caused by mismatching assembling components or its specifications, a verification system and its method is proposed employing the RFID technology. The system is for automatic detection of the assembly errors, so that it can reduce the time and effort needed for verification and maximize the work efficiency. Also, by preventing the assembly errors in advance, the productivity can be increased through a quality innovation.

Human Response Measurement and Ride Quality Evaluation for Seats having various Material Porperties (물성치가 다른 시트에서의 인체 진동 측정 및 승차감 평가)

  • 조영건;박세진;윤용산
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.3
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    • pp.171-180
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    • 2000
  • This paper deals with the whole-body vibration and ride quality evaluation in the vertical direction. The responses of the floor, hip, back, and head in four subjects were measured for various seats when the floor was excited by random vibration with r.m.s of 1.2m/s2 in the vertical direction. In the transmissibility between the hip and floor, the fundamental mode is observed at 4.4 Hz. In the transmissibility between the head and floor, the fundamental mode at 4.4Hz and the second mode at 7.6Hz are observed. It is shown that the head motion is 41% larger than the hip motion and the response of female subject is larger than that of male subject. The response without backrest also was compared with that with backrest. From these human responses ride quality of five seats were evaluated by the ride value such as transfer ration having frequency weighting function is the statistical sense. It is observed that the seat having high damping property can reduce the most acceleration exposed to hip in the statistical sense for all ride valves, while the seat having different seat spring doesn't show statistical difference.

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