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와이베이즈 분석을 통한 건설기계용 라디에이터의 내구성 평가
박태국(Tae-Kook Park),장무성(Mu-Seong Chang),성백주(Baek-Ju Sung),최병오(Byung-Oh Choi),양청광(Cheong-Kwang Yang) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The radiator emits high-temperature heat generated in the engine. The aluminum radiator that is light-weighted and has an excellent heat transfer is used for high efficiency engines. The aluminum radiator was introduced in the construction equipment in the late 2000s, and since then the reliability of radiator has been improved by the efforts of manufacturers. The radiator is exposed to a high temperature when the engine is running and to a low temperature when the engine stops. The radiator is failed by the fatigue due to the cyclic expansion and contraction. In this paper, we estimate a reliability parameter for the radiator by performing the life test with the thermal shock by alternatively circulating high temperature fluid and low temperature fluid directly to the radiator. And the durability of the improved radiator is evaluated using a Weibayes analysis.
박태국(Tae-Kook Park),배승훈(Seung-Hoon Bae),김상교(Sang-Kyo Kim),김선민(Seon-Min Kim),김대환(Dae-Hwan Kim),엄학용(Hak-Yong Eom),이근휘(Keun-Hui Lee) 한국신재생에너지학회 2020 신재생에너지 Vol.16 No.4
Photovoltaic and Thermal collector (PV/T) systems are renewable energy devices that can produce electricity and heat energy simultaneously using solar panels and heat exchangers. Since PV/T systems are exposed to the outdoors, their reliability is affected by various environmental factors. This paper presents a reliability test for a PV/T system and evaluates the test results. The reliability assessment entails performance, environment, safety, and life tests. The factor that had the greatest influence on the life of the system was the hydraulic pressure applied to the heat exchanger. A test was conducted by repeatedly applying pressure to the PV/T system, and a reliability analysis was conducted based on the test results. As a result, the shape parameter (β) value of 5.6658 and the B<SUB>10</SUB>life 308,577 cycles at the lower 95% confidence interval were obtained.
가속수명시험을 이용한 브레이징 판형 열교환기의 수명 예측
박태국(Tae-Kook Park),성백주(Baek-Ju Sung),최병오(Byung-Oh Choi),장무성(Mu-seong Chang),장영규(Young-Gyu Jang),박형준(Hyung-Jun Park) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The brazed plate heat exchanger is lightweight but has excellent heat transfer performance. So, it has been used in various industries as well as refrigeration and air conditioning. Its failure effects on performance and life of the overall system which it is used. Especially, the life is very important because it is directly related to the economical problem of companies. In normal condition, the life test time is generally so long. This paper presents the accelerated stress factors needed for performance of acceleration life test, which are confirmed through failure mode analysis of brazed plate heat exchanger, and introduces the optimal acceleration model. And, the accelerated life test is performed in accordance with the proper test plan using the stress factors such as pressure and temperature. Reliability measures such as MTTF and B10 life for the brazed plate heat exchanger is estimated by statistical analysis of the test data.
박태국(Tae-Kook Park),최병오(Byung-Oh Choi),송태진(Tae-Jin Song),장영규(Young-Gyu Chang),양청광(Cheong-Kwang Yang) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Temperature (high, low, cycle, change) and humidity test has been performed in the basic test of environmental testing. And temperature and humidity test is performed in the temperature and humidity environmental chamber. The reliability has recently been important in the industry. Environmental testing is a branch of the reliability test. So temperature and humidity test has been extensively increased in the industry. In this paper, Temperature in the temperature and humidity environmental chamber is measured during temperature test. The uncertainty of the measured temperature is calculated. So the estimation of uncertainty of the measured temperature is described. The expanded uncertainty (ĸ = 2) of the temperature test is 0.32 ℃
MIL-STD-810G w/Change 1의 고온 및 저온 시험 방법에 대한 고찰
박태국(Tae-Kook Park),최병오(Byung-Oh Choi),강보식(Bo-sik Kang),이기천(Gi-Chun Lee),양청광(Cheong-Kwang Yang),송태진(Tae-Jin Song) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
The environmental tests is a branch of the reliability tests. The environmental tests has recently been important in the industry. High and low temperature tests has been performed in the basic tests of the environmental tests. So high and low temperature tests has been extensively increased in the industry. The MIL-STD-810G w/Change 1 is used as the basic standards to perform the environmental tests. In this paper, It is reviewed in the method for high and low temperature test of the MIL-STD-810G w/Change 1. The product has to operate in climates of the world in which is expected to be used. The climates of the world is different climatic conditions depending on the location. The product is produced, transported and stored in each different condition. So the product is exposed in a variety of conditions, such as high and low temperature. The purpose of the temperature tests obtains data to help evaluate effects of high(or low) temperature conditions on safety, integrity, and performance during storage, operation, and manipulation.
박태국(Tae-Kook Park),김대환(Dae-Hwan Kim),김재형(Jae-Hyoung Kim),이근휘(Keun-Hui Lee),장무성(Mu-Seong Chang),이기천(Ki-Chun Lee),최영도(Young-Do Choi) 한국신재생에너지학회 2019 신재생에너지 Vol.15 No.2
The use of new and renewable energy has increased in several fields. The use of solar energy has taken up a large portion of new and renewable energy. The method to collect solar energy is to produce electricity and obtain heat energy. A photovoltaic cell converts solar light directly to electricity by a photoelectric conversion element. In heat collection, the technology stores solar heat in a fluid using a thermal collector. A PV/T panel is a combination of a photovoltaic panel and a thermal collector, which can produce electricity and heat energy simultaneously. This study examined the electricity and heat energy output of a PV/T panel. Test equipment was developed to measure the performance of a PV/T panel. The results were analyzed by statistical analysis and a regression equation was derived. The heat energy output and electricity can be predicted through the regression equation of the PV/T panel test results. The performance of a PV/T panel predicted by the derived model formula fitted similarly the actual experimental results. The initial framework was constructed and reported at the 2017 conference of the KSME.
수 충격에 의한 체크밸브의 동적 성능 예측을 위한 실험 연구
박태국(Tae-Kook Park),이용범(Yong-Bum Lee),김재형(Jae-Hyeong Kim),이기천(Ki-Chun Lee),백동천(Dong-Cheon Baek) 한국신뢰성학회 2019 신뢰성응용연구 Vol.19 No.1
Purpose: In this study, the dynamic performance by the reproduced water hammer was compared and analyzed according to the shape of the check valve. Methods: The pressure variation caused by water hammer can be obtained using the Joukowsky equation. In actual pipe systems, water hammer occurs in long pipe of several km, but it is impossible to install long pipe in the laboratory environment due to the space constraints. Therefore, the test equipment by installation a pressure tank was developed to replace the long pipe. Results: The pressure of the water hammer phenomenon rises in proportion to the applied pressure at the check valve outlet, and the pressure rise was about three times the applied pressure. Conclusion: The main parameters affecting the water hammer were the applied pressure and the shape of check valve. It was confirmed that the effect of the applied pressure was greater than the effect of the shape of the check valve. It was verified that the multi-disc check valve performs the function of protecting the pump more than single-disc check valve from the water shock of the pipe system. The initial framework has been constructed and reported at the 2017 conference of the KSME [1].
박태국(Tae-Kook Park),성백주(Baek-Ju Sung),양청광(Cheong-Kwang Yang),박형준(Hyung-Jun Park) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
Air conditioning energy consumption in data center accounted for 40% of energy. The local cooling system compared to the conventional cooling method may be 35% energy savings. A deterioration of IT equipment directly connected to the calorific value for effective management of a data center, the lifetime can be extended further than ever. So the use of the local cooling system will be expanded extensively. In this paper, the reliability evaluation of the local cooling system for failure analysis and test methods(total performance test and environmental test, safety test, life test) are presented. And the results of reliability evaluation of are presented.