• 제목/요약/키워드: 열적 져더

검색결과 3건 처리시간 0.016초

반 실린더형 홈을 가진 벤틸레이티드 디스크 브레이크에서의 국소열전달 측정 및 수치 해석 (Local Heat Transfer Measurement and Numerical Analysis in the Ventilated Disc Brake with Semi-Cylindrical Grooves)

  • 이대희;박성봉;임창율;김흥섭;이관수
    • 대한기계학회논문집B
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    • 제30권6호
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    • pp.587-593
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    • 2006
  • A ventilated disc brake having semi-cylindrical grooves has been proposed to improve the thermal judder by way of heat transfer enhancement. The local heat transfer coefficients were measured in the flow passage of disc brake. These measured local heat transfer data were utilized to do the finite element numerical analysis which predicts the maximum temperatures on the disc brake. The results show that the maximum temperatures on the disc surface with semi-cylindrical grooves are approximately 35.2% lower than those without them.

나선형 홈을 가진 브레이크 유로 내에서의 국소 열전달 측정 및 열 유동 해석 (Measurement of Local Heat Transfer Coefficients and Numerical Analysis in the Flow Passage of Disc Brake with Spirally Grooved Surfaces)

  • 이대희;박성봉;임창율;김흥섭;이관수
    • 한국자동차공학회논문집
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    • 제14권6호
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    • pp.104-111
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    • 2006
  • A ventilated disc brake having spirally fluted surface has been proposed to improve the thermal judder by way of heat transfer enhancement. The local heat transfer coefficients were measured in the flow passage of disc brake. These measured local heat transfer data were utilized to do the finite element numerical analysis which predicts the maximum temperatures on the disc brake. The results show that the maximum temperatures on the disc surface with spirally fluted surface are approximately 26.6% lower than those without them.

벤틸레이티드 디스크 브레이크 로터의 최적설계 (Optimal Design of Ventilated Disc Brake Rotor)

  • 이수기;성부용;하성규
    • 대한기계학회논문집A
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    • 제24권3호
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    • pp.593-602
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    • 2000
  • The shape optimization is performed to minimize the judder of ventilated disc brake rotor that is induced by the thermal deformation of the disc. A three-dimensional finite element is developed to analyze the coupled system of temperature and displacement field, and the thermal conductivity and mechanical stiffness matrices are simultaneously taken into account. To reduce computing time, an equivalent heat transfer rate is introduced approximating the heat transfer rate on the disc surface. A deformation factor is introduced to describe the thermal deformation causing the judder. The deformation factor is chosen as an objective function in the optimization process. Consequently an optimum design is then performed minimizing the deformation factor with the design variables of the shape of the disc. The optimum design procedure presented in this study is proven to be an effective method of minimizing the judder, and it reduces the thermal deformation by 23% of the initial geometry.