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아날로그 PID 제어기를 이용한 2단 비례 압력 제어 밸브의 실현에 관한 연구
윤소남(S. N. Yun),정황훈(H. H. Jeong) 유공압건설기계학회 2012 유공압건설기계학회 학술대회논문집 Vol.2012 No.6
The customers who used the hydroulic system desire the product that has more detailed specification quickly during the industrial technology is developed. Every researcher try to reduce the developed period and to satisfy the customers" desire. Lot"s of simulation program and hardware was used already to be satisfied those purpose. But these kind of equipment need a lot of cost to set up and technical knowledge to drive that system. This paper concerns about analog PID controller that can be assembled with a few resistor, condensor and optional amplifier and doesn"t need technical knowledge to drive. At the first, the plant was modeled mathematically to design the analog PID controller"s circuit. After that, PID controller"s parameter was selected by costomer"s desire. Finally, the analog PID controller"s circuit was assembled from control law. The circuit"s availability was confirmed by step response test in the controlled system.
드레인 오리피스를 갖는 포펫 밸브의 상대 안정도에 관한 연구
윤소남(S. N. Yun),정황훈(H. H. Jeong),서정균(J. K. Seo),함영복(Y. B. Ham) 유공압건설기계학회 2010 유공압건설기계학회 학술대회논문집 Vol.2010 No.6
The poppet valve had used every field area due to high quality of leakage property and response characteristic. But this valve still has terrible disadvantage that is self-exited vibration. This problem affects stability of total system and raises noise. The researcher tries to reduce that self-exited vibration when valve was designed. The stability discriminant is the typical study to improve the performance of the poppet valve. This paper concerns about stability discriminant that uses poppet valve with a drain orifice. At the first, the mathematical model is computed from poppet valve. After that, the limitation of stability is calculated that based on Nyquist criterion. At the final, the stability discriminant is selected in each condition and the graph that shows stability in the system is drown by dimensionless quantity.