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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.
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.