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자동변속기 제어기(TCU)의 수명 해석을 위한 가속 시험법 개발
위신환(Shinhwan Wei),김형민(Hyungmin Kim),김성준(Sungjun Kim),강희열(Huiyul Kang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to assess the reliability of the auto-transmission control unit for automobiles, accelerated life test model and procedure are developed. By using this method, failure mechanism and life distribution are analyzed. The main results are as follows; ⅰ) the main failure mechanism is degradation failure that is, junction destruction of a semiconductor resin by high temperature. ⅱ) the life distribution of the auto-transmission control unit is fitted well to Weibull life distribution and the accelerated life model of that is fitted well to Arrhenius model. ⅲ) at the result of the life distribution, accelerated life test method is developed, and test time for life assessment will be shortened by 5,000 hours by this test method.
자동차용 에어컨 클러치 코일의 수명평가 기준과 고장해석
최만엽(Manyeop Choi),위신환(Shinhwan Wei),김정식(Jung-Sik Kim),정해성(Hai Sung Jeong) 한국신뢰성학회 2011 신뢰성응용연구 Vol.11 No.2
The clutch coil mounted on the automotive air conditioner is an important part which actuates the clutch to connect or disconnect the pulley and the compressor according to the climate control condition in an automobile. Here, it is generally required that the clutch coil should ensure the long term durability requirement, such as a warranty for the 10 years of field operation or 160,000 km driving, especially in a brand new item, and so forth. However, some difficulties have arisen in restoring its credibility, since domestic specifications for the part have not been yet unified. In order to ensure the reliability, test methods and assessment criteria should be standardized. Moreover, assessed lifetime under specific conditions and potential failure analysis would be important. In this study, lifetime test specifications for the clutch coil have been reviewed and methodological suggestions are provided to ensure reliability, utilizing a quality function deployment through the potential failure mode effect analysis.
자동차 워셔펌프의 통기구 유무에 따른 작동내구 특성 분석
이상훈(Sanghoon Lee),위신환(Shinhwan Wei),김성우(Sungwoo Kim),김규로(Gyuro Kim) 한국신뢰성학회 2013 신뢰성응용연구 Vol.13 No.1
In this paper, we analyze the failure mechanism of the washer pump to find what is the failure cause in the road environment. The statistics show the field common failure mode is inner corrosion. The failure mechanism is assumed that the inner part of washer pump is corroded due to inflow of moisture through vent hole. To prevent the failure, we can think a method that is covering the vent hole. In general, the vent hole is designed to play an important role in an automobile parts. So, we need to prove the vent hole is not necessary. The first purpose of this paper is to make sure that the vent hole does not affect the durability of washer pump using the analysis of operating condition. The second purpose is to compare the durability properties if the vent hole is covered.
김형민(Hyungmin Kim),위신환(Shinhwan Wei),박동규(Dongku Park),신현동(Hyundong Shin) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The fuel level sender mounted on the automotive fuel pump is an important part which actuates the sender to full or empty the fuel tank according to the fuel pump in an automobile. Here, it is generally required that the fuel level sender should ensure the long term durability requirement, such as a warranty for the 10 years of field operation or 160,000 km driving, especially in a brand new item, and so forth. However, some difficulties have arisen in restoring its credibility, since lifetime for the part have not been yet verified. Moreover, assessed lifetime under specific conditions and potential failure analysis would be important. The result is established by employing the weibull plot and compared the predicted life of fuel level sender to the experimental result.
엄학용(Hakyong Eom),위신환(Shinhwan Wei),김형민(Hyungmin Kim),이희복(Heebok Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
For a ventilator DC motor, the several accelerated tests were carried out in this paper. The accelerated test methods for the brush wear by temperature and voltage, and the bearing wear based on the noise standard were studied. Besides, the insulation aging of motor coil by temperature and humidity was also studied. After all, the following conclusions were obtained from the test results of ventilator DC motor. i)The appropriate accelerated models for the lifetime prediction of brush are the Arrhenius accelerated model and inverse power model. The activation energy of the brush is 0.2eV, and life exponent of the voltage is 8.49. ii)Due to bearing wear, the noise increased exponentially along with the a cumulative number of rotations. iii)A eyring model was applied for motor coil acceleration model, and the result was shown that activation energy was 0.86eV.
엄학용(Hakyong Eom),김성옥(Sungok Kim),위신환(Shinhwan Wei),박상욱(Sangwook Park),김규로(Gyuro Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In order to assess the reliability of the brush-type DC motor for automobiles, accelerated life test model and procedure are developed. By using this method, acceleration factor and life distribution are analyzed. The main results are as follows; ⅰ) the main acceleration factor of brush wear is voltage causing Joule heating effect. ⅱ) environmental temperature is a second factor to affect a brush wear failure. ⅲ) the life distribution of the auto-transmission control unit is fitted well to Weibull life distribution and the accelerated life model of brush is fitted well to the combination model of the Arrhenius’s model and the inverse power model. iv) activation energy is 0.2eV and exponent of the inverse power model is 8.49.