• 제목/요약/키워드: 자기유변유체

검색결과 117건 처리시간 0.031초

자성유변연마의 컨디셔닝 기술 (Conditioning of Magnetorheological finishing)

  • 신영재;이응숙;김경웅;김영민
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.557-560
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    • 2003

  • Magnetorheological finishing(MRF) is a newly developed and recently commercialized for finishing optical components. The magnetorheological fluid consists of a water based suspension of carbonyl iron, nonmagnetic polishing abrasives, and small amounts of stabilizer. This magnetorheological fluid is pumped from conditioner on the rotating wheel and suctioned back to the conditioner, where it cooled to setpoint temperature and evaporative losses are replaced. This method could produce some problems in suction. So newly designed MRF tools is proposed in which MR fluid is not circulated and conditioned by the slurry. The new polishing mechanism is experimented. Measured surface roughness supports the validity of this mechanism.

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소형 MR감쇠기의 성능 실험에 기초한 준능동 제어 시스템 (Semi-Active Control System Based on the Experimental Results of the Performance of a Small Scale MR Damper)

  • 민경원
    • 한국전산구조공학회논문집
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    • 제19권3호
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    • pp.233-238
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    • 2006

  • 이 논문에서는 소형 다층 구조물의 진동제어에 적용하기 위한 복합모드의 자기유변유체(MR) 감쇠기를 개발하였다. 우선, 도식적으로 전단, 유동, 복합모드 MR감쇠기의 형태를 설계조건과 함께 표현하였고, 각각의 모드에 대하여 자기장에 따른 감쇠력을 예측하기 위한 해석모델을 유도하였다. 다음으로 적당한 크기의 복합모드 MR감쇠기를 제작하고 자기장에 따른 감쇠특성을 시간영역에서 평가하였다. 마지막으로 지진하중을 받는 소형구조물에 제작된 MR감쇠기가 준능동 제어기로 제어하였을 때의 성능을 수치적으로 평가하였다.

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자기유변유체를 이용한 승용차량 쇽 업소버의 유한요소 최적설계 (Optimal Design of Magnetorheological Shock Absorbers for Passenger Vehicle via Finite Element Method)

  • 성금길;최승복
    • 한국소음진동공학회논문집
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    • 제18권2호
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    • pp.169-176
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    • 2008

  • This paper presents optimal design of controllable magnetorheological(MR) shock absorbers for passenger vehicle. In order to achieve this goal, two MR shock absorbers (one for front suspension; one for rear suspension) are designed using an optimization methodology based on design specifications for a commercial passenger vehicle. The optimization problem is to find optimal geometric dimensions of the magnetic circuits for the front and rear MR shock absorbers in order to improve the performance such as damping force as an objective function. The first order optimization method using commercial finite element method(FEM) software is adopted for the constrained optimization algorithm. After manufacturing the MR shock absorbers with optimally obtained design parameters, their field-dependent damping forces are experimentally evaluated and compared with those of conventional shock absorbers. In addition, vibration control performances of the full-vehicle installed with the proposed MR shock absorbers are evaluated under bump road condition and obstacle avoidance test.

  • https://doi.org/10.5050/KSNVN.2008.18.2.169 인용 PDF KSCI