• 제목/요약/키워드: friction property

검색결과 339건 처리시간 0.027초

220kV XLPE CABLE 접속함용 Al-Cu 이종접속슬리브 개발 (Development of Friction Welded Al to Cn Bimetallic Sleeve for 220kV XLPE Cable Termination & Joint)

  • 김현주;박정기;박성민
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2010년도 하계학술대회 논문집
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    • pp.93-93
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    • 2010
  • We developed friction welded bimetallic sleeve for 220kV aluminum conductor XLPE cable. Not only friction welded bimetallic sleeve for Termination(EB-A, EB-G) but also friction welded sleeve for Joint of Al to Cu conductor was developed regardless of this project. Generally, friction welded sleeve used to connect Al conductor cable to Cu conductor cable and used for improvement of mechanical property of terminal by offer the copper side of friction welded bimetallic sleeve at the Termination. Connection method for Al-Cu conductor has mainly used friction welding at the solid state, because it is difficult to connect by using conventional welding method. this investigation introduces development of friction welded bimetallic sleeve by friction welding and test result of 220kV Al conductor XLPE cable and accessories using friction welded sleeve.

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SUS 304과 SUS 630 소재의 UNSM(초음파나노 표면개질) 처리전후 Dry, Grease윤활, Oil윤활 상태하에서 마찰특성 및 Dry 상태하에서 마모특성 (Friction characteristics of SUS 304 and SUS 630 stainless steel in Dry, Grease-, and Oillubricated conditions and wear property in dry condition before and after Ultrasonic Nano-crystal Surface Modification)

  • 김준형;편영식;박정현;최갑수;아마노브아외즈한
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2010년도 춘계학술대회 논문집
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    • pp.521-522
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    • 2010
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가속도 정보를 사용하지 않는 마찰계수 식별방법 (Friction Identification without Information of Acceleration)

  • 김성열;하인중
    • 대한전기학회논문지:시스템및제어부문D
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    • 제51권3호
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    • pp.89-95
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    • 2002
  • This paper describes a new identification method for friction in motion control systems, in which the friction model is not necessarily linear in parameters. The proposed method works well with any measurement data of velocity and input control force, as long as the initial and final velocities are identical. Most importantly, the proposed method does not require the information of acceleration for its implementation, in contrast with the previously known methods. This is due to the orthogonality property between acceleration and a function of velocity. In particular, if the parametric model is linear in parameters, its friction parameters can be identified in closed form without resorting to numerical search methods. To illuminate further the generality and practicality of the proposed friction identification method, we show good performance of the proposed method through some simulation results.

내연기관용 무연 핀부싱의 마찰특성에 관한 실험적 연구 (Experimental Study on Friction Characteristics of Pb-free Pin Bushing for an Internal Combustion Engine)

  • 김청균;오경석
    • Tribology and Lubricants
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    • 제23권6호
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    • pp.306-311
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    • 2007
  • This paper presents the friction characteristics of pb-fres pin bushing bearings for an automotive gasoline engine. The external load is 100 N to 600 N and the speed of the pin bushing bearing is 1000 rpm to 3000 rpm against the rubbing surfaces. And the contact modes of rubbing surfaces between a piston pin and a pb-free pin bushing specimen are a dry friction, an oil lubricated friction and a mixed friction that is starved by a lack of engine oil. Two influential factors of a contact rubbing modes and a material property are very important parameters on the tribological performance of a friction characteristic between a piston pin and a pb-free pin bushing. The experimental result shows that the pin bushing speed of 2000 rpm shows a typical oil film lubricated sliding contact mode in which means that as the applied load is increased, the friction loss is increasing. But other contact mode depending on the speed and the load may affect to the fiction coefficient without a regular and uniform trend. In summary, the oil lubricated rubbing surface definitely decreases a running-in period in short and increase oil film stiffness, and this may leads the reduction of a friction loss.

자동차용 마찰재에 사용되는 흑연과 마그네시아에 따른 전이막과 마찰특성에 관한 연구 (The Effects of Graphite and Magnesium Oxide in Automotive Friction Materials on Friction and Formation of Transfer Film)

  • 배은갑;윤장혁;장호
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 2002년도 제35회 춘계학술대회
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    • pp.226-234
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    • 2002
  • A systematic study of the role of transfer films on friction properties was performed with various temperatures in the brake system. An NAO friction material specimens containing 9 ingredients were tested using a pad-on-disk type friction tester A new method of measuring the transfer film thickness was developed by considering the electrical resistance of the transfer film using a 4-point probe technique. The properties of transfer film such as surface morphology and film distribution vaied according to the relative amount of graphite and magnesium oxide. By using SEM, it was possible to obtain information about the chemical composition of the transfer film. Results showed that there detected a threshold value of the relative amount of a two active materials to maintain a certiain thickness of a transfer film. Results also showed that formation of friction layer generated on the friction surface was strongly affected by chemical action of two ingredients during sliding due to chemical reaction of solid lubricants at different interface temperature. The results suggested that no apparent relationship between transfer film thickness and the average friction coefficient was founded and friction characteristics were affected more by the property of the solid lubricant and abrasive in the material.

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수차용 봉수장치의 마찰.마모특성에 관한 실험적 연구 (Experimental Study on the Friction and Wear Characteristics of Contact Sealing Unit for a Water Turbine)

  • 김청균;신인철;임광현
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2006년도 추계학술대회
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    • pp.515-518
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    • 2006
  • This paper presents the friction and wear characteristics of contact type sealing unit for a water turbine of a small hydro-power generation, which Is to stop a leakage of a circulating water from a outside of an impeller to an inside of a rolling bearing. The surface wear strongly affect to the seal life of a mechanical face seal. In this study, the hardness of a stainless steel in which is a heat-treated is 892.8 in Vickers hardness and the hardness of silicone carbide of SiC is 714.1 in Vickers hardness. The surface hardness of a heat-treated stainless steel is 25% high compared with that of a ceramic material of SiC. The contact modes of rubbing surfaces aye a dry friction a water film friction and a mixed friction that is contaminated by a dust, silt and moistures, etc. These two factors of a contact rubbing modes and a material property are very important parameters on the tribological performance such as a friction and wear between a seal ring and a seal seat. The experimental result shows that the surface hardness of a seal material is very important on the friction coefficient and a wear volume. Thus, the results recommend higher hardness of a seal material, which may reduce a friction loss and increase a wear life of primary seal components

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콘크리트 궤도용 레일체결장치의 종방향 마찰거동에 대한 통계적 특성 (Statistical Characteristics for Longitudinal Friction Behavior of Rail Fastening System for Concrete Track)

  • 배현웅;박상준;윤경민;박범호;임남형
    • 한국산학기술학회논문지
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    • 제16권11호
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    • pp.7870-7877
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    • 2015
  • 장대레일 궤도가 철도교량 상에 위치하는 경우, 교량과 궤도의 상호작용에 의해 레일에 발생하는 축력분포가 복잡해지며 부가축력이 발생하여 토노반상 장대레일에 비해 큰 축력이 레일에 발생된다. 이로 인해 교량상에 부설되는 궤도는 교량과의 상호작용 영향을 최소화하여 궤도와 주행열차의 안전성을 추가로 확보하여야 한다. 국내 철도설계지침 및 편람 KRC-08080(궤도-교량 종방향 상호작용 해석)에서는 상호작용의 주요 변수인 레일체결장치의 종방향 저항(마찰거동) 물성치가 유럽기준을 적용하여 특정 수치로 규정되어 있으나, 국내 철도에 적용하기 위해서는 실제 사용되는 체결장치의 성능 특성을 반영한 검토가 필요하다. 본 논문에서는 국내 교량상 콘크리트 궤도에 적용되는 레일체결장치의 마찰거동 실험을 수행하였으며, 이로부터 체결장치의 물성치에 대한 통계적 특성을 분석하였다.