• 제목/요약/키워드: Side member

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Development of 3D Laser Welding System (3차원 레이저 용접시스템 개발)

  • Kang H.S.;Suh J.;Lee J.H.;LEE M.Y.;Jung B.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.932-935
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    • 2005
  • Three dimensional laser welding technology for light car body is studied. A robot, a seam tracking system and 4kW CW Nd:YAG laser are used for three dimensional robot laser welding system. The Laser system is used 4kW Nd:YAG laser(HL4006D) of Trumpf and the Robot system is used IRB6400R of ABB. The Seam tracking system is SMRT-20LS of ServoRobot. The welding joint of steel plate are butt and lap joint. The 3-D welding for Non-linear Tailored blank is performed after the observation experiments of bead on plate. Finally, the welding process for non-linear tailored blank and front side member is developed.

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Design of high stiffness and lightweight body for stiffness distribution ratio (강성 배분비를 괴려한 고강성 경량화 차체 설계)

  • Yang, Hee-Jong;Kim, Ki-Chang;Yim, Hong-Jae;Kim, Chan-Mook
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.11a
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    • pp.562-566
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    • 2006
  • Lightweight body can cause a low stiffness due to the decrease of panel thickness and reinforcing member. The other way, high stiffness body demands an increase of mass. Front pillar section area is decreased due to driver's visual field. Global vehicle stiffness is affected by stiffness distribution ratio between upper part and lower part at side body structure. This paper will describe a process used to evaluate the stiffness distribution ratio based on research of strain energy analysis of the tip rotation method. In addition, optimum design schemes are presented for high stiffness and lightweight body structure considering the investigated stiffness distribution ratio. In this way the designer will be aided by a defined design guide and a set of supporting tool to help him work towards a good design

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Axial Collapse Characteristics of Combined Aluminum CFRP Square Tubes for Light-Weight (경량화용 혼성 알루미늄 CFRP 사각튜브의 축 압궤특성)

  • 이길성;차천석;정진오;양인영
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.110-113
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    • 2004
  • Aluminum and CFRP tube is light-weight material representatively but collapse mechanism is different under axial loading. Aluminum tube absorbs energy by stable plastic deformation under axialloading. While CFRP(Carbon Fiber Reinforced Plastics)tube absorb synergy by unstable brittle failure but its specific strength and stiffness is higher than that of aluminum tube. In this study, for complement of detect and synergy effect by combination with the advantages of each member, the axialcollapsetests were performed for combined aluminum CFRP tubes which are composed of aluminum tubes wrapped with CFRP out side aluminum square tubes. Collapsecharacteristics were analyzed for combined square tubes which have different CFRP orientation angle and thickness. Test results were compared with that of aluminum tubes and CFRP tubes.

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An Experimental Study to Prevent Debdonding Failure of RC Beams Strengthened by Aramid Fiber Sheets (아라미드섬유쉬트로 휨 보강된 RC보의 부착파괴 방지 상세에 관한 실험적 연구)

  • Choi, Ki-Sun;You, Young-Chan;Kim, Keung-Hwan
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.05a
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    • pp.84-87
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    • 2004
  • Nominal flexural strength of RC members strengthened with FRP sheets is generally based on the tensile strength of composite materials obtained from coupon tests. This method is based on the assumption that bond failure does not occur until the FRP sheet reaches its rupture strength. According to the previous researches, however, bond failure often occurs before the FRP sheet reaches its rupture strength. Some attempts were made to control debonding failure by increasing the bonded length of sheet or wrapping the section around their side of the member(U-wrap). In this study, the flexural failure mechanism of RC beams strengthened with AFRP sheets with different bond lengths is investigated. Their strengthening details to prevent the premature debonding failure are also suggested and its effectiveness is verified.

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Chord bearing capacity in long-span tubular trusses

  • Kozy, B.;Boyle, R.;Earls, C.J.
    • Steel and Composite Structures
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    • v.6 no.2
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    • pp.103-122
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    • 2006
  • The capacity of tubular truss chords subjected to concentrated reaction forces in the vicinity of the open end (i.e., the bearing region) is not directly treated by existing design specifications; although capacity equations are promulgated for related tubular joint configurations. The lack of direct treatment of bearing capacity in existing design specifications seems to represent an unsatisfactory situation given the fact that connections very often control the design of long-span tubular structures comprised of members with slender cross-sections. The case of the simple-span overhead highway sign truss is studied, in which the bearing reaction is applied near the chord end. The present research is aimed at assessing the validity of adapting existing specifications' capacity equations from related cases so as to be applicable in determining design capacity in tubular truss bearing regions. These modified capacity equations are subsequently used in comparisons with full-scale experimental results obtained from testing carried out at the University of Pittsburgh.

On the Stability of the Axially Compliant Fixed Scroll Member in Scroll Compressors

  • Hyun Jin Kim
    • International Journal of Air-Conditioning and Refrigeration
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    • v.10 no.1
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    • pp.40-49
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    • 2002
  • Floating fixed scroll adopted for tip sealing enhancement in a scroll compressor is always under the influence of tipping moment produced by internal gas forces. Unless the tipping moment is property compensated by some restoring moment, the fired scroll would suffer tipping movement, degrading the compressor performance. The condition on which the tipping movement of the fixed scroll can be suppressed has been investigated analytically. For no tipping movement, the floating fixed scroll should be suspended on the main frame at proper level. The upper limit of the stable suspension is the axial location of the o-rings adopted for a back pressure chamber sealing on the rear side of the fixed scroll, and the lower limit is the mid-height of the scroll wrap.

Stress Analysis of Large Commercial Vehicle Frames with Bolted Joints (볼트 체결된 대형 상용차 프레임의 응력해석)

  • Yong-Kuk Park;Jin-Gon Kim
    • Journal of Advanced Marine Engineering and Technology
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    • v.28 no.4
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    • pp.577-586
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    • 2004
  • Structural failures, such as crack initiation, often arise near the bolted parts of the side member and trunnion bracket in some commercial vehicles. The purpose of this paper is: 1) establishment of a simple and practical bolted joint modelling technique and 2) determination of the key design variables for design improvement based on numerical experiments. Once the bolted joint modelling technique is established through experimental verification, the key design variables must be identified in order to alleviate the level of the stress concentration near the problem region. Numerical results indicate that the torsional rigidity of the frame cross-section should be increased to reduce the level of the maximum stress at the actual crack initiation location.

Optimization of Sheet Metal Forming Process by using Decision-Making Theory (의사결정이론을 이용한 박판성형공정의 최적화)

  • Kim, Kyung-Mo;Yin, Jeong-Je
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.2
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    • pp.125-136
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    • 2012
  • Wrinkle and fracture are two major defects frequently found in the sheet metal forming process. In this process there are more than one design attributes to optimize and several uncontrollable factors which cannot be ignored in determining the optimal values of design variables. Therefore, attempts to reduce defects through a traditional optimization technique are often led to failures. In this research, a new design method for reducing the wrinkle and fracture under uncontrollable factors is presented by using decision-making theory. To avoid the psychological difficulties in determining the scaling constants of the multi-attribute utility function by using the ordinary lottery questions, a pair-wise comparison procedure is adapted to avoid this problem. The effectiveness of the proposed method is illustrated through a robust design of sheet metal forming process of a side member of an automotive body.

A study on the design thinking of Modern Design (모던 디자인 (Modern Design)의 디자인 사고에 대한 연구)

  • 오창섭
    • Archives of design research
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    • v.13 no.1
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    • pp.87-100
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    • 2000
  • This thesis concentrates on modern design with understanding the ooncept of design thinking. Functionalism and exactness in design result from the project that modern design attempted to change everyday life with mechanical design language. There is thought to be convenient and profitable, to link a function and a need, to make something with building-up process, and to give judgement something by dualism in the other side. That thoughts were produced by not only transition of production system from by hand to by machine but also atmosphere of society that enables one to know himself as a member of modern age.

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Design of High Stiffness and Lightweight Body for Stiffness Distribution Ratio (강성 배분비를 고려한 고강성화 경량화 차체 설계)

  • Yang, Hee-Jong;Kim, Ki-Chang;Lim, Si-Hyung;Kim, Chan-Mook;Yim, Hong-Jae
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.17 no.10
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    • pp.901-906
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    • 2007
  • Lightweight body due to the decrease of panel thickness and reinforcing member might cause low stiffness. On the other hand, high stiffness body requires an increase of mass. Front pillar section area has been decreased for increasing the driver's visual field. Global vehicle stiffness is affected by stiffness distribution ratio between upper part and lower part at a side body structure. This paper describes a process used to evaluate the stiffness distribution ratio based on strain energy. In addition, optimum design schemes are presented for high stiffness and lightweight body structure considering the investigated stiffness distribution ratio.