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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.
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.
Groove Type 플라스틱 풀리의 정밀도 향상을 위한 금형 보상 가공에 관한 연구
심창업(Changup Shim),구효선(Hyoseon Ku),엄학용(Hakyong Eom),윤형로(Hyoungro Yoon),김형민(Hyungmin Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The plastic pulley applied to the car is the item in which this application increases drastically due to the advantage including vehicle lightweight, cost down through the mass production, and etc. to the key components of the aid drive required for the engine drive. Recently, when the loosened coated the engine noise stands out in the existing and while the low noise engine is drastically spreaded like the reduction of the engine noise and hybrid vehicle the importance is recognized. The uniformity of the outer wheel face of the lee, which the noise problem of the plastic pulley will loosen after the product injection surface roughness, and precision of the shape have to be secured. Because of being heated by the specific temperature as to the process including on characteristic injection of the plastic material, and etc. and being molded, the surface shrink problem is generated and this shrink problem brings the illuminance of the outer wheel face, shape, and size irregularity. In the industry field bottleneck technique development subject, in order to improve the noise problem of the plastic pulley materially, the noise problem had in the plastic pulley based on the mould drawing technology compensating the molding contraction in the mold tries to be effectually improved.
시험 DFSS기법을 이용한 릴레이의 고장인자 영향도 분석
이희복(Heebok Lee),위신환(Shinhwan Wi),엄학용(Hakyong Eom),성기우(Kiwoo Sung),이용(Yong Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Failure factors of the automotive relay are operating voltage, load voltage, temperature and chattering count. In order to analyze effects of failure factors for the relay, effects of them are solved through DFSS method. In this study, the effect of failure factors is analyzed under the same load. The final results are as follows; ⅰ) Experiment is designed by L? tables of orthogonal arrays. ⅱ) failure factors of four types are used as control factors. And 3 levels are used. ⅲ) The influence of failure factors is interpreted in the following orders; (1. Chattering count 2. Load voltage. 3. Temperature. 4. Operating voltage.) ⅳ) finally for these reason, influence of failure factors is analyzed and verified.