• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.1
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• pp.15-20
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• 2017

The main purpose of the ball valve ball is to be moved by the rotation of the stem when fully open or completely closed. In this study the heat of the initial model, which used a structure interaction analysis technique, tried to examine the structural safety of the high temperature for the ball valve. In the initial model the stress of the exiting sheet was more than the yield strength. We selected two design shapes with variables of length and thickness for the optimization of the sheet. The Kriging interpolation method was applied to a meta-model-based optimization technique. As a result, it was possible to find a thickness and length for the sheet within the yield strength. This was done by measuring the value of the capacity coefficient of the valve and evaluating the performance of the ball valve.

• Journal of the Korea Convergence Society
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• v.10 no.6
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• pp.165-170
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• 2019

This study carried out the structural analysis and vibration analysis on scooter seat. By comparing with three kinds of B-bone A, Julio B, and City Ace C, the load was applied to scooter seat as much as a weight of person. Through structural analysis, this study examined which seat is most deformed by comparing the deformation each other or affords passengers most convenience and does not afford passengers the inconvenience by absorbing the vibration during driving. Model C has the most total deformation at the structural analysis result and Model B is seen to be changed to be convenient to sit the deformation as it deforms largely. Through this study, which seat is most convenient and becomes strong on durability can be confirmed. As the durability analysis result data of scooter seat model obtained on the basis of this study result are utilized, the esthetic sense can be shown by being grafted onto the machine or structure at real life.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.10 no.4
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• pp.50-56
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• 2011

Injection molding process is one of the popular manufacturing methods to produce plastic parts with high efficiency and low cost. Ball seat for automobile suspension is made by an injection molding process as a part to support pivot function of ball joint consisted of ball stud and housing. It is necessary for a ball seat to have a dimensional stability in the three dimensional inner area to be contacted with ball stud. In this paper, the dimensional stability of inner surface is indirectly analyzed by checking the difference of inner diameter around the circumferential direction and the thickness variation at the top part of ball seat. Measurement was performed by using the coordinate measuring machine and the fixture to hold ball seat. Optimization of injection molding processes such as injection time, cooling time and temperatures of cylinder barrel was derived to reduce the difference of inner diameter and the thickness variation at the top part of ball seat based on the Taguchi method.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2000.11a
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• pp.453-459
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• 2000

개개인의 생활 수준 향상으로 자동차가 개인 교통 수단이나 레저 생활용으로 더욱 많이 활용되면서 장시간 운전이 늘어감에 따라, 운전자의 신체적 피로는 운전 중의 사고의 원인이 되고 있으며, 장시간 운전시의 피로감의 원인이라고 할 수 있는 엔진과 노면으로부터 인체에 전달되는 진동에 대한 대비책으로, 시트 부분의 내진 및 감쇠 설계가 실제로 운전자가 느끼는 승차감 즉 안락성에 결정적인 역할을 한다고 볼 수 있다. 국내의 경우 자동차 시트 기술은 대부분 외국 기술에 의존하고 있는 실정이어서 전문적인 연구는 매우 미흡한 실정이다.(중략)

• Proceedings of the Korean Information Science Society Conference
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• 2012.06b
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• pp.175-177
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• 2012

본 논문은 스마트 테스트 도구(Smart Test Tool)를 이용해 식기세척기 소프트웨어를 검증하는 기법에 대해 제안한다. 가전제품의 동작을 기술하기 위해 통상 스펙시트(spec. sheet: 동작명세서)를 이용하는데, 스펙시트를 이용하면 식기세척기 소프트웨어를 개발자 수준에서 블랙박스 테스트 방법으로 검사해 볼 수 있다. 스펙시트는 식기세척기 행정의 기준이 되며 식기세척기를 실제로 동작시키며 얻은 덤프데이터(dump data)는 비교 대상이 된다. 스마트 테스트 도구는 스펙시트 값의 기준대로 덤프데이터 값이 출력되었는지 확인함으로써 각 행정이 제대로 진행되었는지 파악할 수 있다. 이 논문에서는 스마트 테스트 도구의 구조와 오류 검출 메커니즘에 대해 기술한다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2002.05a
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• pp.164-170
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• 2002

현재 농업용 장비들은 특성상 사용자에게 심한 양의 진동을 가하고 있다. 이는 사용자에게 나쁜 승차감을 주고 또한 장시간 운전시에는 건강에도 좋지 않은 영향을 줄 수 있다. 본 연구에서는 농업용 트랙터에서 사용자에게 전달되는 진동의 양을 측정하여 사용자가 느끼는 승차감을 정량적으로 측정하고 또한 건강에 미칠 수 있는 영향에 대해 평가해 보았다. 실험은 포장도로와 농로 그리고 논갈기 작업시에 인체에 전달되는 12축의 진동을 측정하였고, 또한 트랙터에 사용되는 서스펜션 시트의 특성을 보기 위해 시트 아래의 수직방향 진동을 측정하였다 실험에 참가한 피실험자는 모두 현재 트랙터를 사용하고 있는 4명을 대상으로 하였다 실험 결과 현재의 트랙터는 사용자에게 좋지 않은 승차감을 주고 있으며 건강에도 좋지 않은 환경을 제공하고 있음을 볼 수 있었다. 이러한 환경을 개선하기 위해서는 서스펜션 시트의 설계가 중요하게 되는데 보다 좋은 승차감을 제공하기 위해서는 인간이 민감하게 느끼고 또 트랙터에서 많은 양이 나타나는 주파수 대역의 진동을 저감하기 위한 설계가 필요하다고 할 수 있다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.2
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• pp.373-380
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• 2020

A valve product can be over-designed or too heavy. Finite element analysis was performed using ANSYS for two and three-dimensional ball valve models, and the ball weight was reduced by optimization within the allowable design criteria. The ball is structurally safe according to the computed stress values, which are within the material's admissible stress. The weight was reduced by about 22%, and the structural safety factor was 1.25. The structural safety of the seat insert and ring, which are used to prevent leakage, was confirmed through finite element analysis. It is shown that the two-dimensional analysis can result in similar values to the three-dimensional analysis for the axisymmetric structure. The redesign of the valve is not included in the results since such changes require a whole new design process, including all valve components.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2001.04a
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• pp.346-349
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• 2001

Nowadays the amount of plastic products is increasing in modern industry. Plastic materials are continuously developed to satisfy the mechanical, physical, and chemical properties. The increasing application of plastic parts in automobile and aerospace industries is due to the fact that it can reduce the structural weight and can lessen the environmental contamination. Among many manufacturing technologies for plastic parts, the injection molding process is very attractive because of its low cost and short production time. Through various analyses of resin flow and molding process for the conventional gate and cooling mechanism, a new type of mold was designed which had different gate location and cooling systems. Newly designed ball seat has an excellent performances, i.e. diminished weld-line, residual stress density, higher magnitude less crack propagation and smaller dimensional contractions effect.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.07a
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• pp.300-302
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• 2005

X7R 특성을 가지는 적층 칩 캐패시터 제작시 그린시트의 두께에 따라 유전율, 절연파괴 전압. C-V특성이 변화되며 특히, 그린시트의 두께는 C-V특성에 중요한 인자임을 확인할 수 있었다. 적층수 증가에 따른 특성 검토시 80층 이상부터 재료의 물성 변화로 예상되는 특성을 볼 수 있으며 특히 전류-전압특성에서의 층수 증가에 따른 영향을 몰 때 유전체 조성 및 공정조건을 최적화하여야 함을 확인하였다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.12 no.1
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• pp.109-116
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• 2008

In order to test the adhesive capacity of carbon fiber sheet, a static loading method for bending-behavior-type beam specimens, cut in half was developed and test was conducted with compressive strength of concrete set as the test parameter. The tests were performed to prescribe adhesive shear strength based upon the result of shear failure as well as verification of testing method. First of all, the test method proved to be reliable in determining the adhesive shear strength. The test result also exhibited two types of variations in adhesive shear strength. Among two types of variations, average and minimum values for adhesive shear strength, relatively stable results, 3.41MPa and 2.11MPa, respectively. Particularity in the adhesive shear strength with respect to compressive shear strength was not found.