• Title, Summary, Keyword: 원통 접촉

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Wheel/Rail Contact Analysis with Consideration of Friction and Torque (마찰과 토크를 고려한 차륜/레일 접촉 해석)

  • Song, Ki-Seok;Han, Seung-Hee;Choi, Yeon-Sun
    • Journal of the Korean Society for Railway
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    • v.17 no.1
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    • pp.14-18
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    • 2014
  • Wheel/rail contact is a significant problem in railway dynamics. In this paper, the wheel/rail contact is examined analytically and numerically as a contact problem between two cylinders where torque and friction have effect. Furthermore, the contact of a real wheel and rail is investigated numerically where the normal and shear force act. This study demonstrates that the wheel/rail contact is a process that generates traction force through creep where rolling and sliding occurs simultaneously depending on the shape of the wheel and rail, and the friction coefficient between them.

Roll-type Micro Contact Printing for Fine Patterning of Metal Lines on Large Plastic Substrate (대면적 미세 금속전극 인쇄를 위한 원통형 마이크로 접촉 인쇄공정)

  • Kim, Jun-Hak;Lee, Mi-Young;Song, Chung-Kun
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.48 no.6
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    • pp.7-14
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    • 2011
  • This paper is related to a roll-type micro-contact printing process. The proper parameters such as coating velocity, inking velocity, printing velocity and printing pressure as well as Ag contents of Ag ink were extracted to perform the fine patterning of Ag electrodes. Additionally we developed a process for PDMS with high uniform thickness. Finally, we obtained the Ag fine electrodes on $4.5cm\;{\times}\;4.5cm$ plastic substrate with the line width of 10 um, thickness less than 300 nm, surface roughness less than 40 nm, and the specific resistance of $2.08\;{\times}\;10^{-5}{\Omega}{\cdot}cm$.

Diameter Measurement of Cylindrical Objects by Non-Contact Method (비접촉식 방법에 의한 원통형 물체의 지름 측정)

  • Im, Bok-Ryoung;Kim, Sok-Won
    • Korean Journal of Optics and Photonics
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    • v.16 no.3
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    • pp.177-181
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    • 2005
  • Although there are many ways to measure the diameter of a cylindrical object, in this study, the diameter of a cylindrical objects were measured by the geometric optical method and interference-diffraction method which are two kinds of tipical non-contact methods. In geometric optical method, the curved laser beam is formed on the cylindrical surface by spreading the inclined laser beam using the cylindrical lens. The curve is captured by CCD camera and the diameter is calculated by geometry. And the interference and diffraction patterns of investigated cylindrical objects are analyzed in interference-diffraction method. In this study, the cylindrical objects, whose diameters are $0.05\;mm\;\~\;100.50\;mm$ were measured by the geometric optical method and interference-diffraction method. The results show that in each method, the relative errors of the measurement are within $2\%$ and $1\%$, respectively and these non-contact methods can be applied in the quick measurement of many objects.

Analysis of Contact Problem of Mating Gear Teeth Taking Account of Friction on the Involute Surface (마찰을 고려한 치차의 접촉 문제 해석)

  • 이대희;최동훈
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.13 no.6
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    • pp.1118-1127
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    • 1989
  • 본 연구에서는 두 치차사이의 접촉 문제를 해석하기 위하여 마찰을 고려한 수직 하중과 접선 하중이 동시에 작용하는 경우에서의 접촉 문제를 수식화하였다. 그리고 두개의 원통의 접촉으로 가정함이 없이 실제적인 인벌루우트 곡면간의 접촉 문제를 해석하기 위하여 유한 요소법을 사용하였으며 비선형 연립 방정식으로 수식화된 된 접촉 문제를 효과적으로 풀기 위하여 최적화 기법을 이용한 산법을 제시하였다. 이때 마찰을 고려한 치차의 접촉 문제 해석에 필요한 수직 압력 분포는 이 등에 의하여 이루어진 결과를 이용하였다. 제시한 산법에 의하여 마찰을 고려한 두 치차의 접촉 문제를 해석하여 치차 손상의 중요한 원인중의 하나인 피팅(pitting) 현상을 유발하는 실제적인 조건을 고려함으로써 자동화 및 정밀화 되어가는 기계의 중요한 부품으로서 치차의 정밀 설계를 하기 위한 정확한 자료를 제시하였다.

원통연삭에 있어 비가공시간 단축기술

  • 김선호;박화영
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.103-107
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    • 1994
  • 본 연구에서는 원통 프런지 연삭에서 비가공시간을 줄이기 위해, 공연삭시간 단축과 드레싱 신호를 이용한 숫돌 손상상태 검출에 관한 연구를 수행하였다. 연삭기의 심압대에 설치한 AE센터와 숫돌 덮개에 설치한 초음파센서를 이용해 공연삭, 공작물과 숫돌의 근접, 접촉상태를 감시하고 이에 대응해 적절히 이송속도를 제어했다. 그리고 드리싱시 나타나는 AE 신호의 표준편차를 이용해 숫돌의 손상상태를 검출해서, 드레싱 기회에 대한 효과적인 정보를 제공합으로써 비가공 시간을 단축했다.

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Development of a Modular Magnetostrictive Transducer for Torsional Guided Wave Transduction in a Cylindrical Structure (원통형 구조물에서 비틀림 유도초음파 변환을 위한 모듈형 자기변형 트랜스듀서 개발)

  • Cho, Seung-Hyun;Park, Jae-Ha;Kwon, Hyu-Sang;Ahn, Bong-Young;Lee, Seung-Seok
    • Journal of the Korean Society for Nondestructive Testing
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    • v.29 no.5
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    • pp.427-435
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    • 2009
  • Cylindrical structures such as pipes and shafts are widely used in various industrial facilities. Recently, researches on magnetostrictive transduction of torsional waves have been actively reported for the nondestructive evaluation of those cylindrical structures. However, the existing magnetostrictive patch transducer has somewhat inconvenient and time.consuming process like patch bonding to a structure since it should employ a magnetostrictive patch having strong magnetostriction. To overcome these limitations of the existing transducer, in this work, we develop a novel modular magnetostrictive transducer to generate and measure torsional waves to inspect a cylindrical structure. The proposed transducer can be applied as viscous liquid coupling with shear couplant or dry coupling without coupling media instead of patch bonding to a structure. We describe a detailed structure of the modular transducer and conduct some experiments to verify its performance.

Derivation of Added Mass Matrix and Sloshing stiffness matrix of the Ideal Fluid using BEM and Application to the Seismic Analysis of Cylindrical Liquid storage tanks. (경계요소법에 의한 이상유체의 부가질량 및 슬러싱 강성행렬 도출과 원통형 액체 저장 탱크 지진응답 해석)

  • 김재관;이진호;진병무
    • Journal of the Earthquake Engineering Society of Korea
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    • v.4 no.3
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    • pp.83-98
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    • 2000
  • 유연한 액체 저장탱크 내 유체의 부가질량 및 슬러싱 강성행렬을 도출하는 새로운 방법을 제시하였다. 비점성, 비압축성 이상유체를 표면 출렁임을 고려하여 경계요소법에 의하여 모델링하였다. 유체의 표면과 저장탱크 벽체의 접촉면과 같은 불연속 경계를 다루기 위해 특별한 과정을 도입하였다. 원통형 액체저장탱크의 지진응답해석에 적용하여 우수한 결과를 얻을 수 있음을 확인하였다.

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Experimental Study on Inward Melting of Phase Change Material in Inclined Circular Tube (경사진 원통형 용기내에서 상변화 물질의 내향 용융에 관한 실험적 연구)

  • Yim, Chang-Soon;Son, Ha-Jin
    • Solar Energy
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    • v.12 no.1
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    • pp.48-58
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    • 1992
  • In the present investigation, experimental analysis was performed to research heat transfer phenomena generated by means of conduction and natural convection at a succession of tube-inclimations relative to the vertical tube during inward melting process of a phase change material. The phase change material used in the experiments is 99 percent pure n-docosane paraffin($C_{22}H_{46}$). When the tube is vertical, the dominant mode of energy transfer between the tube wall and the melting interface is natural convection. On the other hand, when the tube is inclined to the vertical, the melting solid is brought into direct contact with the tube wall by the action of gravity. In the experimental results, direct contact gave rise to substantial enhancements in the amount of melted mass, relative to those for natural-convection-dominated melting.

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The Characteristics of Ozonizer using Dielectric Barrier Discharge and Water Quality Improvement (유전체 장벽 방전에 의한 오존발생기의 오존생성 및 하수 수질개선 특성)

  • Lee, Chang-Ho;Lee, Ho-Sang;Woo, Sung-Hun;Kim, Jong-Hyun;Song, Hyun-Jig;Lee, Sang-Keun;Lee, Kwang-Sik
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.273-276
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    • 2008
  • 본 연구에서는 Air 및 Oxygen을 원료가스 사용하여 원통형 오존발생기의 오존생성농도를 측정하여 오존발생량 및 오존생성 수율을 계산하였다. 오존발생기에서 발생된 오존을 오존접촉조내의 원수 30[L]에 기상 오존주입량 3[g/$m^3$]를 투입하여 오존접촉 시간의 변화에 따른 오존접촉 실험 6일 후의 녹조 특성을 조사하였다. 오존생성특성 결과 원료가스가 Air인 경우, 최대오존생성 농도는 유량 1.0[$\ell$/min] 에서 5.5[g/$m^3$], 최대오존발생량은 유량 5.0[$\ell$/min] 에서 1.0[g/h]를 얻을 수 있었고, 원료가스가 Oxygen인 경우, 최대오존생성농도는 유량 1.0[$\ell$/min] 에서 51.5[g/$m^3$], 최대오존발생량은 유량 4.0[$\ell$/min] 에서 4.5[g/h]를 얻을 수 있었다. 오존접촉 실험 6일 후에서 원수와 오존접촉시간 1분에서 녹조 현상을 관찰할 수 있었고 나머지 오존접촉시간에 따른 오존 처리 수에서는 녹조 생성을 관찰할 수 없었다.

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Numerical Study on the Optimal Shape of Concrete Plug for Compressed Air Energy Storage Caverns (압축공기에너지 저장 공동의 콘크리트 플러그 최적 형상에 대한 수치해석적 연구)

  • Park, Doh-Hun;Kim, Hyung-Mok;Ryu, Dong-Woo;Synn, Joong-Ho;Song, Won-Kyong
    • Tunnel and Underground Space
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    • v.21 no.3
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    • pp.164-173
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    • 2011
  • In the present study, the stability of a compressed air energy storage cavern was numerically assessed by concrete plug shapes in order to investigate the optimal shape of concrete plug. The concrete plugs were cylindrical, embedded cylindrical, tapered, and wedged in shape. The stability assessment was carried out based on factor of safety through a strength reduction method and a volume ratio which refers to the ratio of the volume of yield regions in concrete induced by internal pressure to all concrete volume. The results from the present study indicated that the embedded cylindrical and taper shaped plugs were mechanically more stable than the cylindrical and wedge shaped plugs. However, from a comparison of stress distributions in rock mass between the embedded cylindrical and taper shaped plugs, the taper shaped plug was found to be more optimal than the embedded cylindrical plug, since the embedded cylindrical plug caused more stress concentration in the interface between the plug and rock mass than the taper shaped plug.