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온도․비열 가속모형을 적용한 유압호스조립체 수명특성 연구
이기천(Gi-Chun Lee),김형의(Hyoung-Eui Kim),조유희(You Hee Cho),심성보(Sung-Bo Sim),김재훈(Jae-Hoon, Kim) 한국신뢰성학회 2011 신뢰성응용연구 Vol.11 No.3
Hydraulic hose assemblies deliver a fluid power in various oil pressure equipment such as construction machinery, automobile, aircraft, industrial machinery, machine tools and machinery for ships. Also, they are widely used as pipes in oil pressure circuit. When we estimate their lifetime, it is essential to conduct an accelerated life test by choosing the factor that suits the usage condition of the test object since traditional test method for estimating lifetime under the influence of various external factors incurs hardship in terms of time and expenses. The objective of this study is to propose an acceleration model that takes both temperature and pressure without flexing condition into consideration. The lifetime is estimated by applying the proposed temperature-nonthermal acceleration model to the test data. And we compare the proposed temperature-nonthermal acceleration model and the accelerated life equation suggested by John(1994).
압력과 온도 복합가속모형을 적용한 유압호스 조립체 수명특성 연구
이기천(Gi Chun Lee),김형의(Hyoung Eui Kim),조유희(You Hee Cho),김재훈(Jae Hoon Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
유압호스는 건설기계, 자동차, 항공기 등 각종 기계의 유압장치에서 동역을 전달하기 위한 배관으로 사용된다. 산업의 전분야에서 에너지를 전달하기 위한 배관의 한 종류로써 진동이나 충격 등으로부터 시스템을 보호하는 역할을 한다. 여러 가지 외부 환경 조건으로부터 시스템을 유지하기 위해서는 호스 조립체에서 온도와 압력 등의 외부 환경 조건에 대한 내성을 가지고 있어야만 한다. 본 연구에서는 기존에 호스 조립체에 대해 온도 또는 압력 중 한 가지 인자를 고려한 가속모형을 제시한 연구는 있었지만 두 가지 인자를 동시에 고려한 가속모형은 제시하지는 못하였으므로, 호스 조립체의 압력과 온도를 모두 고려한 복합가속 모형식을 제안하는 것을 목적으로 한다. The hydraulic hose used to the delivery of hydraulic power to the hydraulic mechanism of the mechanical system in construction, automobile, airplane, and etc. The hose assembly roles to protect from the vibration and impulse in the all industry field as one of the kind of piping system to delivery the energy. To keep the system safely from the various outside environments, the hose assembly endures the various factors like the pressure, temperature and etc with the outer environment. This study deals with the hydraulic hose assembly adopting the complex accelerated model with pressure and temperature considering with the two factors simultaneously, because there were the life prediction models proposed with one factor like the pressure and the temperature separately.
이기천(Gi-Chun Lee),김형의(Hyoung-Eui Kim) 한국유체기계학회 2011 유체기계 연구개발 발표회 논문집 Vol.2011 No.11
The butterfly valve has been used over all industries. It has been studied to improve its performance through the theoretical analysis and the test in industry. Though products adopted those improvements have been sold in markets, manufacturers often launch products without the life test. One reason is that the long development period and financial difficulties. The other is the lack of the design and fabrication experiences on building the life test equipment. Thus, this study has been researched for the design and fabrication of our life test equipment, and developed and improved the equipment to check the leakage of the valve with the naked eyes during the test.
건설기계용 카운터웨이트 시험장비 및 가속수명시험법 개발
이기천(Gi-Chun Lee),이용범(Young-Bum Lee),최병오(Byung-Oh Choi),강보식(Bo-Sik Kang),김도식(Do-Sik Kim),최종식(Jong-Sik Choi),김재훈(Jae-Hoon Kim) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.12
카운터웨이트를 수명시험 하기 위해서는 실제 현장과 유사하게 2 톤의 무게를 가진시켜 주는 대형 가진기가 필수적이다. 그렇지만 이러한 장비를 일반업체에서 보유하여 시험하기는 어려우므로, 이러한 애로점을 해소하기 위해 본 연구에서는 첫번째로 2 톤의 중량물일지라도 건설기계의 신뢰성을 평가하는 전기모터들로 구성되는 회전식 가진기를 사용하여 실제 현장조건을 재현하는 시험장비를 개발하였고, 주요 구성품에 대해 카운터웨이트의 고장해석을 수행하였다. 두번째로 현장으로부터 필드데이터를 측정하여 수명시험에 활용할 수 있도록 하였다. 마지막으로 성능과 수명을 확인하기 위해 가속수명시험법을 개발하였고, 제품의 고장발생 없이 B5 10,000 시간을 만족하는 가속수명시험을 완료하였다. A large-sized exciter that vibrates a two-ton component is required to simulate the field operating conditions of a counterweight of an excavator. However, it is difficult for a small-medium sized company to obtain a large exciter for the life test of a counterweight which is an equivalent counterbalancing weight that balances a load. Therefore, in this study, we developed life test equipment for evaluating the reliability of construction machinery weighing about two tons. It simulates the field operating conditions using rotational vibrators consisting of electric motors. A failure analysis of the counterweight was also performed for the major components. Field data acquired from various sites were applied to the life test design of the counterweight. Finally, a zero-failure qualification test based on the accelerated life test was designed, and there was no failure during the test, which guarantees a B5 life of 10,000 hours.
압력과 온도 복합가속모형을 적용한 유압호스 조립체 수명특성 연구
이기천(Gi Chun Lee),김형의(Hyoung Eui Kim),조유희(You Hee Cho),김재훈(Jae Hoon Kim) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.11
유압호스는 건설기계, 자동차, 항공기 등 각종 기계의 유압장치에서 동력을 전달하기 위한 배관으로 사용된다. 산업의 전분야에서 에너지를 전달하기 위한 배관의 한 종류로서 진동이나 충격 등으로부터 시스템을 보호하는 역할을 한다. 여러 가지 외부 환경 조건으로부터 시스템을 유지하기 위해서는 호스 조립체에서 온도와 압력 등의 외부 환경 조건에 대한 내성을 가지고 있어야만 한다. 본 연구에서는 기존에 호스 조립체에 대해 온도 또는 압력 중 한 가지 인자를 고려한 가속모형을 제시한 연구는 있었지만 두 가지 인자를 동시에 고려한 가속모형은 제시하지는 못하였으므로, 호스 조립체의 압력과 온도를 모두 고려한 복합가속 모형식을 제안하는 것을 목적으로 한다. Hydraulic hoses are used as pipelines for transferring power from hydraulic systems in various machineries such as construction equipments, automobiles, and aircraft. Hydraulic hoses protect the system from vibration or impacts, and they are being used to transfer energy in all segments of the industry. In order to protect the system from various external environmental conditions, hydraulic hose assemblies must be able to withstand a wide range of temperatures and pressures, as well as variations in other factors. In previous studies, an acceleration model for the hydraulic hose assembly was developed by taking into account only one of the acceleration factors (temperature or pressure). Therefore, the objective of this study is to develop a comprehensive acceleration model that takes both temperature and pressure into consideration.
건설기계용 카운터웨이트 시험장비 및 가속수명시험법 개발
이기천(Gi-Chun Lee),이용범(Young-Bum Lee),최병오(Byung-Oh Choi),김도식(Do-Sik Kim),최종식(Jong-Sik Choi) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
The counter weight is a heavy material installed in equipment to balance the center of gravity of construction machinery or special equipment. When the connection part of the counter weight, which is connected to the construction machinery such as the excavator or a fork lift, is broken to be separated, it can be very risky due to the loss of the center of gravity and its overturn. So, it is necessary to secure its reliability. However, to perform the life testing of the counter weight, it is required to have very large-sized exciter which simulates the vibration to the about 2-tons heavy material similar to that occurring in the real field. Firstly, the stress of the broken part of the counter weight is analyzed by failure analysis performed for the major components in this paper. Secondly, the field data acquired in the site was applied to the life test of the counter weight. Also, we developed the life test equipment, which is simulated real service condition with a rotational vibrator using the electric motor, to evaluate the reliability of the construction machineries even though the weight of the sample was heavy weight about 2 tons.