• Title, Summary, Keyword: LPG filling unit

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Stress Behavior Analysis of O-rings and Packing for a LPG Filling Nozzle (LPG 충전노즐용 O-링과 패킹의 응력거동해석에 관한 연구)

  • Kim, Chung-Kyun
    • Tribology and Lubricants
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    • v.22 no.1
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    • pp.20-25
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    • 2006
  • The stress behavior analysis of a-rings and packing for a LPG filling unit has been presented using a finite element analysis technique by non-linear MSC/MARC program. The sealing performance and endurance of a-rings and packing are affected by working conditions such as filling pressure, friction coefficient, compression ratio, and material properties. The elastomeric polymers of O-rings and packing are nitrile butadiene rubber (NBR) and polytetrafluoroethylene (PTFE), which are selected as proper materials of a-rings and packing based on the stress analysis results. The calculated FEM results showed that the proper material of O-ring is NBR as a secondary sealing component and the recommended material of packing is PTFE as a primary sealing unit during a LPG filling process.

Optimized Design of O-ring Groove in LPG Filling Unit Using Taguchi Experimental Method (다구찌 실험법을 이용한 LPG 충전노즐 O-링 그루브의 최적화 설계연구)

  • Kim Chung-Kyun
    • Journal of the Korean Institute of Gas
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    • v.10 no.2
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    • pp.40-46
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    • 2006
  • In this paper, the optimized design of a rectangular O-ring groove has been analyzed for a maximum Cauchy stress and maximum strain using the Taguchi method. This method may efficiently optimize the design parameters for an O-ring groove of a LPG filling unit. The computed FEM results indicate that the optimized design parameters can only be drawn by nine experimental numbers of iterations when the Taguchi design technique has been employed with a finite element method. This means that the Taguchi design method is very useful for the optimization design of O-ring rectangular groove geometry. Based on the computed FEM results by the Taguchi design technique, the dimensions of a groove geometry are given as h=2.5 mm, d=2.74 mm, c=0.15 mm, and w=3.0 mm. In this study, the initial compression ratio of O-rings is recommended as 8.7% for a gas supply pressure of 18 $kg/cm^2$.

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A Study on the Optimized Design of O-rings for LPG Filling Unit (LPG 충전노즐에 장착된 O-링의 최적설계에 관한 연구)

  • Kim Chung-Kyun;Kim Do-Hyun
    • Journal of the Korean Institute of Gas
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    • v.10 no.3
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    • pp.34-40
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    • 2006
  • This paper presents the optimized design of O-rings with a rectangular groove and dovetails, which are strongly related on the sealing performance of LPG filling unit. The computed results on the optimal design are analyzed by non-linear MARC finite element program with Taguchi method. O-rings with 4 different groove models are analyzed for 3 different elastomeric materials. The design parameters are given to polymer materials, groove depth, groove width, and diameter of O-rings. The FEM computed results showed that the affection ratios of O-ring diameter and material property are the most influential parameter among the groove width, groove depth, and compression ratio. Thus, this paper recommends model III for a rectangular groove and model IV for a dovetail groove with a given gas supply pressure of 1.764 MPa.

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Finite Element Analysis of Contact Behavior Characteristics in LPG Filling Unit Depending on Multi-ball/Cylinder Rolling Friction Motions (LPG 충전기에서 다수 볼-실린더의 구름마찰운동에 따라 달라지는 접촉거동특성에 관한 유한요소해석)

  • Kim Chung-Kyun
    • Journal of the Korean Institute of Gas
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    • v.10 no.2
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    • pp.27-32
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    • 2006
  • In this paper, the contact stress and friction force between multi-balls and rolling friction contact surfaces of two cylinders have been presented using a finite element analysis. The multi-balls for a rolling friction motion may be contacted with a reciprocating mechanism of a parallel cylinder and a misaligned cylinder in a LPG filling unit. The FEM computed results indicate that SiC ceramic and SUS 304 balls show a high contact stress and friction force on the contact spot of rolling balls. But the PEEK balls show a low contact stress and friction loss due to a high flexibility of a PEEK polymer. In this study, we may recommend SiC and SUS 304 balls for high compressive loadings between a multi-ball and a cylinder contact mechanisms and PEEK balls for a low compressive force. And the misalignment between two cylinders should be restricted for a low contact stress and friction loss, especially.

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