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논문 : 노외기계시스템공학 ; 타이어 시뮬레이터를 이용한 능동형 타이어 공기압 제어 시스템 개발
이규철 ( K. C. Lee ),류관희 ( K. H. Ryu ),이중용 ( J. Y. Rhee ),홍지향 ( J. H. Hong ),김혁주 ( H. J. Kim ),유지훈 ( J. H. Yu ) 한국농업기계학회 2010 바이오시스템공학 Vol.35 No.1
This study was performed to develop an active tire pressure control system that can adjust tire pressure to the optimum level according to traveling and working condition of agricultural tractor. For the development of active tire pressure control system, pneumatic supplier, solenoid valve block including pneumatic supply line, infinite rotation type pneumatic supplier with rotary joint unit, tire pressure transceiver module and control algorithm were developed. Also, tire simulator was developed. Using this tire simulator, the feasibility of each part constructing actual system was tested by checking the performance. The average communication success ratio was 98.3% between tire pressure transmitter and receiver module according to the various tire rotational speed and data receipt position of receiver module. The communication performance of the developed transmitter and receiver module was very stable in any condition. The tire pressure control system was accomplished by using the proportional control algorithm in this study. Also tire pressure control performance of developed control system was analyzed by using the tire simulator. As a result of control performance analysis to the developed system, the developed control system took 307 seconds to inflate agricultural tractor`s tire from 50 kPa to 180 kPa. In opposite case, it took 210 seconds. Also it was able to control the tire pressure accurately under ±0.9% (FS) in any condition.
강성규(S.K. Kang),이승재(S.J. Lee),유인수(I.S. Ryu),이규철(K. C. Lee) 한국연소학회 2007 한국연소학회지 Vol.12 No.4
Utilization of sewage sludge for industrial fuel should be considered in appropriate calory with low emission of environmental pollutants and the amount of sewage sludge for continuously long-time operation. For the low grade fuel(<4,000kcal/㎏), one of proper processes is that coal and oil are added into sewage sludge to remove impurities and increase calory(>7,000kcal/㎏) and the amount of fuel having sewage sludge. Recently, 2-step agglomeration has been attempted by secondarily agglomerate sewage sludge onto the primary nuclei formed by agglomeration of coal and oil. Furthermore, sawdust and waste oil can substitute about 1/3 each for coal and mineral oil consumed in this process, which will lead to securing alternative energy resources from environmental pollutants as well as cost reduction.