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브러시 및 워터젯을 이용한 풍력 발전 블레이드 표면 청소 효율 측정
전민석(Minseok Jeon),김병곤(Byunggon Kim),박소라(Sora Park),홍대희(Daehie Hong) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.9
Blades of wind energy plants are exposed to external shocks or internal cracks during operation. Furthermore, the blade surfaces can be contaminated by substances such as dust, blood of birds, salt or insects which can decrease the electricity generation efficiency significantly. For this reason, many blade cleaning companies started to appear and a variety of methods for cleaning were suggested. Despite these diverse methods, there has been no study to investigate how effectively to clean the substances in quantitative manner. In this paper, the cleaning efficiency of two rotor blade cleaning methods, brush and water-jet, is examined through experiments by changing operating parameters. Then, the optimal operating conditions for both methods are derived.
AMR방식 SAS와 Optical방식 SAS의 Hysteresis 특성 비교에 관한 연구
남철(Chul Nam),전민석(Minseok Jeon),표재우(Jaewoo Pyo),박기범(Kibum Park),이석우(Seagwoo Lee),이대성(Daesung Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, we confirmed Hysteresis characteristic in absolute angle detect SAS(Steering Angle Sensor) with AMR (Anisotropic Magneto Resistance) type sensor and implemented back-lashless Optical Type SAS with symmetrical PWM code to improve Hysteresis. We expected good result at Hysteresis characteristic but faced problems such as roter’s gap with the steering shaft and delay time caused by angle calculation algorithm. If we solve these problems Optical type SAS will become a better Steering Angle Sensor.
김종헌(Jong Heon Kim),전민석(Minseok Jeon),전경태(Kyungtae Jeon),이상훈(Sang Hoon Lee),홍대희(Daehie Hong) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.4
Nowadays in building construction field, workers become aged and avoid dirty, difficult, and dangerous work. Above all, a person who is in charge of beam assembling work in high and narrow space just relies on safety belt. So these workers should be highly trained. This paper deals with a new locomotion robot that can take this in charge, which will be able to provide less labor costs, less time to build a building and safer environments for workers. The geometric features of steel structure in building construction were carefully analyzed and developed a locomotion mechanism optimized to it. The robot was designed to be rugged, strong, and fast rather than having excessive mobility. Feasibility of the developed robot was verified through experiments.
AMR방식 SAS의 Magnetic Field 특성에 관한 연구
남철(Chul Nam),전민석(Minseok Jeon),표재우(Jaewoo Pyo),이석우(Seagwoo Lee),이대성(Daesung Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents the effect of magnetic field on Steering Angle Sensor (SAS) with AMR sensor. The AMR sensor uses the magnetoresistive effect, so it may have some errors caused by non-standard magnetic field components. For example week magnetic field, non-symmetrical sensor for magnet arrangement, influence of external magnetic field, we have analyzed these error components for optimized design of SAS.
Backlash제거를 위해 Multi-Magnet Disc를 이용한 절대각 센서
박성우(Sungwoo Park),노지형(Jihyoung Roh),전민석(Minseok Jeon),남철(Chul Nam),표재우(Jaewoo Pyo),이석우(Seagwoo Lee),공준호(Junho Gohng),문병무(Byungmoo moon),이대성(Daesung Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
These days absolute steering angular sensor(SAS) is used in vehicles as a component of electric power steering, anti-collision system, ASS/ESP, auto light system, auto parking system and so on. A number of SASs are developed and used in companies and research institution. The sensors are mostly magnetic type because of non-contact type and prevention of pollution. Most magnetic type SAS have used AMR sensors and gears. But this method has the backlash problem. So we use a multi-magnet disc for elimination of backlash without gears. Hall IC is used to SAS for multi-magnet's magnetic flux is measured. As a result, characteristics of this method are resolution which is 0.014° and elimination of backlash problem.