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박태조,조용민 경상대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.16 No.-
In this paper, the performance improvement methods are suggested to the previously developed hydraulic couplers which are widely used for hydraulic line quick disconnections. Design modification of the components is focused mainly on the reductions of the pressure drop and leakage for connected and disconnected conditions, respectively. Performance tests are carried out under ISO7241 regulations, and variations of the pressure drop with oil flow rate are compared for various couplers. The results showed that the pressure drop characteristics are highly improved and the performances are superior or equal to those of Parker's. Therefore present design methods and data can be used to improve the performance of other types of couplers.
박태조 경상대학교 생산기술연구소 2003 工學硏究院論文集 Vol.19 No.-
In this paper, a numerical analysis is carried out to investigate the effects of a radial groove in circular disk type thrust bearing which adopted in the scroll compressor. The hydrodynamic pressure distributions in the lubricating film, bearing load capacities, friction forces and tilting moments acting on the disk are calculated solving the Reynolds equation for tilted conditions. A radial groove reduces highly the pressure difference in the circumferential directions and overturning moments. Therefore. this paper showed theoretically the effectiveness of radial groove in disk type thrust bearing for stable operations. And there exists an optimum radial groove position which makes tilting moments minimum for given operating conditions. The numerical methods and results can be applied to enhance the lubrication performance of thrust bearing for scroll compressor.
박태조 慶尙大學校生産技術硏究所 1995 生産技術硏究所論文集 Vol.11 No.-
In this paper, a finite difference method and the Newton-Raphson method are used to calculate the destohydrodynamic lubrication film thickness in elliptical contacts problem. The minimum and central film thicknesses are compared with those of Hamrock & Dowson's numerical results and their film thickness formulas. More accurate EHL film thickness formula for elliptical contact problems can he expected using present numerical methods. therefore. further research should be required.