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엄학용,조유희,최종식,이규석,이기천,이용범,송은택,이기석 (사)한국축산환경학회 2021 한국축산시설환경학회지 Vol.23 No.3
In this study, in order to analyze the factors affecting the moisture content of the livestock manure dehydration device, the moisture content was measured under 48 conditions according to the plan and method of the screen compression test. Based on the measured results, ANOVA was performed using Minitab, and three factors were viewed as independent variables, and the water content measured at each level was defined as a response variable to examine the linear relationship between the independent variable and the response variable together. Among the results of ANOVA on moisture content, Pareto graphs confirmed factors affecting moisture content among screen size, compression load, and manure content. From the results of measuring the moisture content, it was found that among the three factors at the significance level of 5%, screen size and compression load were statistically factors that influence the moisture content, and the interaction between the excreta and each factor did not affect the moisture content.
엄학용(Hak-Yong Eom),이기천(Gi-Chun Lee),장무성(Mu-Seong Chang),박종원(Jong-Won Park),이용범(Yong-Bum Lee) 한국신뢰성학회 2018 신뢰성응용연구 Vol.18 No.3
Purpose: In this study, the life of the motor is investigated by performing the accelerated life test with the brush wear of the industrial cleaner motor as the main failure mode. Methods: The accelerating stress factor of the accelerated life test is a voltage, which can increase the number of revolutions of the motor to accelerate the brush wear due to the friction between the brush and the commutator. Also, the accelerating stress level was determined after determining the maximum allowable level of the voltage through the preliminary test. Results: The motor failure time at each accelerating stress level was predicted by regression analysis with brush wear length as performance degradation data. The main failure mode, which is brush wear, of the motor was reproduced by this test. The shape parameter of the Weibull distribution was confirmed to be the same statistically at all accelerating stress levels by the likelihood ratio test. Conclusion: The life of the motor was investigated by performing the accelerated life test with the brush wear of the industrial cleaner motor as the main failure mode. Through the accelerating test method of the cleaner motor, various life expectancy and life expectancy of the acceleration factor are predicted.
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.