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탈황 흡수탑 유도전동기 베어링 결함 진단을 위한 전류 스펙트럼 해석
박정현,문승재,Bak, Jeong-Hyeon,Moon, Seung-Jae 한국플랜트학회 2015 플랜트 저널 Vol.11 No.2
본 연구는 석탄화력 탈황설비인 흡수탑 교반기용 유도전동기의 베어링 결함진단을 토대로 전류 스펙트럼 해석이 예측정비 수단으로서 활용할 수 있는지를 논하고자 하였다. 베어링의 교체 전과 후의 전류스펙트럼 해석을 하고 베어링을 육안 점검하여 비교 분석함으로써 실제 발전 산업현장에서 부하운전중인 유도전동기의 베어링의 결함진단을 하였다. 분석 결과, 볼과 외륜의 베어링 결함에 해당하는 주파수성분이 예측한 값으로 검출되었고 전압기준의 진폭크기로 환산하여 베어링 교체하기 전과 후를 비교하면 결함이 진행될 경우 볼 결함에서는 약 2.9배 증가되고 외륜 결함에서는 약 2.24배 증가 되었음을 확인할 수 있었다. 이 같은 결론으로 인위적인 고장요소에 의한 베어링 결함진단 뿐만 아니라 산업현장에서 부하 운전되고 있는 유도전동기의 베어링 결함을 사전에 예측하는데 있어서도 매우 유용하였다. According to a research that is based on a previous study, But in a different way, This study shows fault diagnosis of Induction motor bearing which runs in coal-fired power plant industries on Desulfurization absorber agitator using Spectrum analysis of Stator Current and visual inspection. As a result of harmonic content analysis of stator current spectrum, It was possible to detect ball and outer race fault frequency. The comparison in the context of this experiment proves that the amplitude of faulty frequency is increased in three times at a fault in ball and in outer race. Spectrum analysis of stator current can be used to detect the presence of a fault condition as well as experiment in faulty bearings, besides early fault detection in bearings can prevent unexpected power generation loss and emergency maintenance cost.
박정현(Jeong-Hyeon Bak),이광희(Kwanghee Lee),이철희(Chul-hee Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
There are some reports saying that over the half of reasons of car accidents on the highways are due to dozing off at the wheel. To prevent those accidents, this paper suggests a way to control the steering wheel actively when unwilling lane departure of car occured. The activation condition of the control system is decided by turn signal and the information of the vehicle, such as location, velocity and etc.. By using those information of the vehicle, the control algorithm become activated and carried out to minimize the possibility of accidents. As rapid steering control can cause other car accidents, the controller must control the car with proper steering speed for the safety. The simulaton was carried out to validate the algorithm first and the algorithm was implemented on the test system. Futher study will be carried out to improve the algorithm and adapt to actual vehicles.
박정현(Jeong-Hyeon Bak),이광희(Kwanghee Lee),이철희(Chul-hee Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In recent days, vehicles have become equipped with electric system that assist and help drivers driving safe in highway. Lane Departure Warning and Lane Keeping Assistant System are one of those safe system. Sudden and inattentive lateral motion of vehicle due to drivers fatigue, illness, inattention, and drowsiness are major causes of accidents in highway. In order to prevent and minimize any possible accidents due to lateral motion of vehicle, active steering control system is designed and simulated in this study. Activation and warning areas are defined for the control system with respect to the location of vehicle and parameters for vehicle dynamics. The current location of vehicle is obtained by Global Positioning System (GPS) and it can detect GPS-based lanes then determine whether activates or not.
현정환 ( Hyeon Jeong Hwan ),박정현 ( Jeong Hyeon Bak ),이홍우 ( Hong Wo Lee ),안광준 ( Gwang Jun An ),김태상 ( Tae Sang Kim ) 대한산부인과학회 2003 Obstetrics & Gynecology Science Vol.46 No.2
Meconium peritonitis is the chemical inflammation or foreign body reaction of peritoneum resulted from the prenatal bowel perforation associated with or without obstructive lesion during late intrauterine or early neonatal periods. Prenatal ultrasonograph
군집 모바일 로봇의 대형 분할을 통한 충돌회피 대형 제어
강윤석(Yoon Seok Kang),박정현(Jeong-Hyeon Bak),김덕하(Deok Ha Kim),박종현(Jong Hyeon Park) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
This paper proposes a new control method for a swarm of mobile robots to formation patterns while avoiding collisions between them. The swarm formations are made without any external controls during the motions of the mobile robots. Each individual robot needs to go to its predetermined terminal target region while avoiding collisions with the other robots. This study assumes 2-D planar motions in forming multiple shapes. In order to form a easily recognizable shape when the robots finish their motions, it is proposed that the concept of velocity field is used, based on an artificial potential