• 대한기계학회논문집A
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• 제33권1호
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• pp.82-88
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• 2009

A disadvantage in the design of gerotor pump is a lack of parts that can be adjusted to compensate for wear in the rotor set, and as a consequence, it causes a sharp reduction of efficiency. In this paper, an attempt has been made to reduce the wear rate between the rotors of a gerotor pump. To do this, floating genetic algorithm (FGA) is used as an optimization technique for minimizing the wear rate proportional factor (WRPF). The result shows that the wear rate can be reduced considerably, e.g. approximately 8% in this paper, throughout the optimization using FGA.

• 대한기계학회논문집A
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• 제33권12호
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• pp.1383-1392
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• 2009

A disadvantage in the design of a hypotrochoidal gear pump as in a gerotor pump is a lack of parts that can be adjusted to compensate for wear in the rotor set, and as a consequence, it causes a sharp reduction of volumetric efficiency. In this paper, an attempt has been made to reduce the wear rate between the rotors of a hypotrochoidal gear pump. Using the knowledge of shape design on the rotors, the contact stresses without hydrodynamic effect between the rotors' teeth are evaluated through the calculation of the Hertzian contact stress. Based on the above result and the sliding velocity between the rotors, a genetic algorithm (GA) is used as an optimization technique for minimizing the wear rate proportional factor (WRPF). The result shows that the wear rate or the WRPF can be reduced considerably, e.g. approximately 12.8% in this paper, throughout the optimization using GA.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 추계학술대회 논문집
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• pp.445-446
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• 2008

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 추계학술대회 논문집
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• pp.447-448
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• 2008

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 춘계학술대회 논문집
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• pp.777-778
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• 2008

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 추계학술대회 논문집
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• pp.95-96
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• 2009

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 추계학술대회 논문집
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• pp.97-98
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• 2009

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 추계학술대회 논문집
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• pp.121-122
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• 2009

• Elastomers and Composites
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• 제58권4호
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• pp.179-190
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• 2023

The effect of the particle size and silica structure on the wear behavior of Silica/Styrene-Butadiene Rubber (SBR) compounds was investigated using a blade-type abrader and the findings were compared with those obtained with an Akron abrader. The compensated characteristic parameter (Ψ_c), which was the contributory factor of the combined effect of the particle size and filler structure, was introduced. This parameter was found to exhibit a linear relationship with the Young's modulus. The Young's modulus correlated more with Ψ_c than the uncompensated characteristic parameter (Ψ) modeled for carbon black. The wear rate and volume loss measured using a blade-type abrader and Akron abrader were respectively observed to be inversely proportional to Ψ_c, that is, the wear resistance of Silica/SBR compound improved as the particle size became smaller and the silica structure became intricate. The coefficient of determination (R²) obtained from the linear relationship between Ψ_c and wear rate was higher than those between Ψ_c and volume loss for the Silica/SBR compound. Thus, the blade-type abrader exhibited high potential to be used for accurately evaluating the effect of particle size and structural properties of silica on the wear behavior of SBR compounds.

• 감성과학
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• 제17권4호
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• pp.71-78
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• 2014

PET 중공필라멘트 복합 DTY(Draw Textured Yarns)와 ATY(Air-jet Textured Yarns)는 경량의 스포츠 의류를 포함한 고감성 의류용으로 많이 사용되고 있다. 본 연구는 중공섬유 복합 DTY와 ATY 복합사 직물의 수분 및 열이동에 관계되는 쾌적특성에 중공 복합사 및 직물의 구조 특성이 어떠한 영향을 미치는 가에 대한 분석이다. 기공의 크기가 큰 중공 복합 직물의 흡수성이 우수하였고 커버팩터는 영향을 미치지 않았다. 또한 ATY사 직물이 DTY사 직물에 비해 흡수성이 우수하였다. 반면, 건조특성은 기공 사이즈가 미세한 직물이 기공사이즈가 큰 직물보다 건조시간이 짧았으며 낮은 커버팩터와 기공 사이즈가 작은 하이멀티사 직물이 중공 복합직물에 비해 건조 특성이 우수하였다. 직물의 기공 사이즈는 공기투과도와 열전도도 특성에 가장 중요한 인자였다. 직물의 큰 기공도는 중공 복합 직물의 기공도와 열전도도에 비선형적인 반비례 상관관계를 나타냈다.