• Title/Summary/Keyword: Manifold Design

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Sharing Ship Design Model Based on STEP methodology (STEP 방법론을 이용한 선박설계 모델의 공유)

  • Yong-Jae Shin;Soon-Hung Han
    • Journal of the Society of Naval Architects of Korea
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    • v.35 no.4
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    • pp.98-108
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    • 1998
  • Hull design data is currently prepared by a 2D CAD system and re-input to 3D CAD systems specialized for detail design or to a structural analysis system. In this paper, sharing design data among different CAD systems has been studied. Based on STEP methodology, a neutral model is generated from 2D AutoCAD drawings. To handle a geometric data of this model, the non-manifold model of ACIS is used because it can support various CAD data representation such as 2D graphic entities, 3D wireframe, 3D surface model, and solid B-Rep/CSG model. It is observed that a mon-manifold model can easily be transformed to a 3-D wireframe model for the hull detail design system AutoDef or a FE model for the structural analysis system Nastran.

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A Study on the Optimum Design of Resonance Intake System For 4 Cylinder Diesel Engines (4실린더 디젤기관 공명 흡기계의 최적설계에 관한 연구)

  • 남정길
    • Journal of Advanced Marine Engineering and Technology
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    • v.22 no.6
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    • pp.836-843
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    • 1998
  • In this paper effects of resonator within intake manifold system on volumetric efficiency were investigated n the 4-cylinder and 4 stroke Diesel Engines. The effects of resonator system were analyzed on resonant speed and on volumetric efficiency for a complicated intake system with resonator was confirmed. And the optimum design method of the resonant system which had the overall high and flat characteristic of volumetric efficiecncy was proposed.

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EXPERIMENTAL APPROACH FOR EVALUATING EXHAUST FLOW DISTRIBUTION FOR PZEV EXHAUST MANIFOLDS USING A SIMULATED DYNAMIC FLOW BENCH

  • Hwang, I.G.;Myung, C.L.;Kim, H.S.;Park, S.
    • International Journal of Automotive Technology
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    • v.8 no.5
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    • pp.575-581
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    • 2007
  • As current and future automobile emission regulations become more stringent, the research on flow distribution for an exhaust manifold and close-coupled catalyst(CCC) has become an interesting and remarkable subjects. The design of a CCC and exhaust manifold is a formidable task due to the complexity of the flow distribution caused by the pulsating flows from piston motion and engine combustion. Transient flow at the exhaust manifold can be analyzed with various computational fluid dynamics(CFD) tools. However, the results of such simulations must be verified with appropriate experimental data from real engine operating condition. In this study, an experimental approach was performed to investigate the flow distribution of exhaust gases for conventional cast types and stainless steel bending types of a four-cylinder engine. The pressure distribution of each exhaust sub-component was measured using a simulated dynamic flow bench and five-hole pitot probe. Moreover, using the results of the pitot tube measurement at the exit of the CCC, the flow distribution for two types of manifolds(cast type and bending type) was compared in terms of flow uniformity. Based on these experimental techniques, this study can be highly applicable to the design and optimization of exhaust for the better use of catalytic converters to meet the PZEV emission regulation.

Vibration Design and Analysis of Plastic Intake Manifold (플라스틱 흡기다지관의 진동설계 및 해석)

  • 허승진;김찬민;정영섭;이선석;김진우
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1998.04a
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    • pp.166-172
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    • 1998
  • In contrast to the conventional intake manifold of steel or aluminum material, the lst natural frequency range of plastic intake manifold becomes very lower to ca. 40Hz. That causes negative effects on the engine control unit installed inside the throttle body. In this paper, support design concepts to increase the natural frequency range larger than max. 200Hz are suggested based on the vibration analysis results using finite-element method. In conclusion, it is shown that the vibration level can be reduced most effectively by the installation of the neck support bracket between the throttle body and the plenum chamber.

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A Study on the Effects of the Design Parameters and Sealing Mechanism of the Exhaust Gas in Engine Exhaust System (엔진 배기계의 배기가스 누설 메카니즘과 설계인자들의 영향에 관한 연구)

  • Choi, B.L.
    • Journal of Power System Engineering
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    • v.14 no.4
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    • pp.37-42
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    • 2010
  • This paper deals with the sealing mechanism of the gasket component and the effects of design parameters for the exhaust manifold. The finite element model includes hot-end exhaust system and a simplified gasket model supplied by ABAQUS software. The mechanical behaviors of bead and body of a gasket are measured after several times of cyclic loads by gasket supplier. From the finite element analysis due to the cyclic thermal loads, the flange of exhaust manifold shows thermal expansion and contraction in longitudinal direction as well as convex and concave deformations with respect to the engine cylinder head. And, the contact pressures of the gasket beads suddenly changes by normal deformation of inlet flanges. Therefore, the magnitudes of contact pressures could be used to determine the sealing characteristics of the exhaust gas in the exhaust system. The distributions of contact pressures in gasket bead lines shows a good agreement with the engine test results.

Issues Related to the Modeling of Solid Oxide Fuel Cell Stacks

  • Yang Shi;Ramakrishna P.A.;Sohn Chang-Hyun
    • Journal of Mechanical Science and Technology
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    • v.20 no.3
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    • pp.391-398
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    • 2006
  • This work involves a method for modeling the flow distribution in the stack of a solid oxide fuel cell. Towards this end, a three dimensional modeling of the flow through a Solid Oxide Fuel Cell (SOFC) stack was carried out using the CFD analysis. This paper examines the efficacy of using cold flow analysis to describe the flow through a SOFC stack. It brings out the relative importance of temperature effect and the mass transfer effect on the SOFC manifold design. Another feature of this study is to utilize statistical tools to ascertain the extent of uniform flow through a stack. The results showed that the cold flow analysis of flow through SOFC might not lead to correct manifold designs. The results of the numerical calculations also indicated that the mass transfer across membrane was essential to correctly describe the cathode flow, while only temperature effects were sufficient to describe the anode flow in a SOFC.

CFD and Structural Analysis for Design of Automobile Exhaust Manifold (자동차용 배기관 설계를 위한 유동 및 구조 해석)

  • Lee, Kwang-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.8 no.5
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    • pp.984-990
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    • 2007
  • The objective of this study is the estimation of the $O_2$ concentration range, the thermal behavior by high temperature exhaust gas and durability of exhaust manifold by the coupling analysis of CFD and structure analysis. This estimation results is used the guideline to the optimum design of exhaust manifold.

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Natural Resolution of DOF Redundancy in Execution of Robot Tasks;Stability on a Constraint Manifold

  • Arimoto, S.;Hashiguchi, H.;Bae, J.H.
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.180-185
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    • 2003
  • In order to enhance dexterity in execution of robot tasks, a redundant number of degrees-of-freedom (DOF) is adopted for design of robotic mechanisms like robot arms and multi-fingered robot hands. Associated with such redundancy in the number of DOFs relative to the number of physical variables necessary and sufficient for description of a given task, an extra performance index is introduced for controlling such a redundant robot in order to avoid arising of an ill-posed problem of inverse kinematics from the task space to the joint space. This paper shows that such an ill-posedness of DOF redundancy can be resolved in a natural way by using a novel concept named “stability on a manifold”. To show this, two illustrative robot tasks 1) robotic handwriting and 2) control of an object posture via rolling contact by a multi-DOF finger are analyzed in details.

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A Study on the Mechanical Design and the 2.5-axial Combined Machining by CAD/CAM (CAD/CAM을 활용한 기계설계 및 2.5축 복합가공에 대한 연구)

  • Lee, Yang-Chang
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.6
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    • pp.97-103
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    • 2008
  • In this paper, the Post Process for the manifold complex processing using CAD/CAM Software of two and a half Dimensions(2.5D) has been developed to maximize the application of the manifold manufacturing machine. Many companies are currently making use of high price systems to improve manufacturing process using the multi-axial complex manufacturing machine. In accordance with the requirements, the utilization of CAD/CAM Software for the manifold complex manufacturing machine is earnestly demanded. However, the experts who have experience in manifold manufacturing machine are insufficient. Consequently the outcomes of the Post Process for 2.5D CAD/CAM Systems have been dealt in order to be smoothly operated by those who have basic skills and be understood in process drawings. CNC program functions can be specially used as they are, when drawn up. The Post Process for the original point designation and transformation of coordinates has been developed and applied. The results gave proof of practical manufacturing outcomes.

Structural Optimization of a Manifold Valve for Pressure Vessel (압력용기 매니폴드 밸브의 구조최적설계)

  • Bae, Tae-Sung;Kim, Si-Pom;Lee, Kwon-Hee
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.12
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    • pp.102-109
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    • 2009
  • This study proposes the structural optimization of a manifold valve. FE analysis is performed to evaluate the strength of a manifold valve. In addition, the structural optimization technique is applied to reduce its weight. In this study, the optimization method using the kriging interpolation method is adopted to obtain the minimum weight satisfying the strength constraint. The maximum stress and the weight are replaced by the metamodels. In this process, tile sample points are generated by latin-hypercube design. Optimum designs are obtained by ANSYS Workbench and the in-house program.