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변종영(Jong-Yeong Byun),주우진(Woo-Jin Joo),문춘근(Choon-Geun Moon),윤정인(Jung-In Yoon),정석권(Seok-Kwon Jeong) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
This paper presents temperature control of oil outlet in an oil cooler with compressor's speed control. The control system was designed for obtaining precise temperature control performance based on flow rate control of compressor's speed even though disturbances addition to the system. PI controller was adopted in feedback control system. We showed that the gain of PI could be easily determined by using simulation. Through some experiments, excellent control performances such as steady state temperature error within ±0.1℃ were established by the PI controller. We expect that the system can control the target temperature within error of 0.6℃ under abrupt disturbances.
변종영(Jong-Yeong Byun),주우진(Woo-Jin Joo),최준혁(Jun-Hyuk Choi),문춘근(Choon-Geun Moon),윤정인(Jung-In Yoon),정석권(Seok-Kwon Jeong) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
This paper presents precise temperature control of oil outlet in an oil cooler with hot-gas bypass control as an industrial refrigerator. The control system was designed for obtaining precise temperature control performance even though abrupt disturbances based on flow rate control of hot-gas bypass. PID controller was adopted in feedback control system. We showed that the gain of PID could be easily determined by using gain-tuning methods without any numerical model. Through some experiments, excellent control performances such as overshoot within 1.7%, steady state temperature error within ±0.1℃ were established by a simple PI controller. We expect that the system can control the target temperature within error of 0.33℃ under abrupt disturbances.
주우진(Woo-Jin Joo),변종영(Jong-Yeong Byun),정석권(Seok-Kwon Jeong) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Compressor is a major component of refrigeration system. Therefore many attempts to improve performances of the compressor have been conducted. The reliability qualification test is essential when a new product of a compressor is developed to guarantee life time of the product under normal operation conditions. General reduction method of reliability qualification test period is known as acceleration life test. This test is conducted in high stress condition than normal stress condition. An acceleration factor should be increased to reduce reliability qualification test period. And an acceleration factor is usually obtained through an acceleration life test. Through experiments, current was a main factor that affecting condition to highest stress under high temperature. Acceleration factors of two samples were estimated 8 and 7 individually by using the 10℃ law. This result shows that we can reduce the reliability qualification test period 12.5% and 14.3% of total test period.
PI와 피드포워드 제어를 이용한 공작기계용 오일쿨러의 핫가스 바이패스 방식 정밀 온도 제어
정석권(Seok-Kwon Jeong),변종영(Jong-Yeong Byun),김상호(Sang-Ho Kim),윤정인(Jung-In Yoon) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.2
Recently, the performances of speed and accuracy are enhanced in machine tools. The high speed of the machine tools usually causes harmful thermal displacements on the objects. To reduce the thermal displacements, machine tools generally adopt oil coolers with precise temperature control function. This study aims at precise control of oil outlet temperature in the oil coolers with hot-gas bypass manner based on PI control logic. The control system was designed for obtaining steady state error within ±0.1℃ and maximum overshoot with 0.8% even though abrupt disturbances are added to the system. We showed that the PI gains could be easily decided by numerical simulations using practical transfer function which got experiments. Also, transient characteristics could be improved significantly by reflecting the inlet temperature of an evaporator to the output of a controller feedforwardly considering periodic abrupt disturbances. Through some experiments, excellent control performances were established by the suggested control.