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LMI를 이용한 불확실시스템에 대한 섭동의 상위경계치해석
김찬용(C. Y. Kim),윤소남(S. Yun),최봉열(B. Y. Choi),박평원(P. W. Park) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this paper, we deal with the upper boundary analysis of perturbation in an uncertain system using LMI. Existing papers used a pole assignment method that locates pole in the specified region to obtain expected performance and the optimal solution of the upper boundary for stable region was got by Lyapunov method. In this study, the method for the upper boundary analysis of perturbation in an uncertain system using LMI for get a stable system characteristics was proposed. And, it was confirmed that the proposed LMI method is more excellent than the Lyapunov method.
윤소남(S. N. Yun),김찬용(C. Y. Kim),김충환(C. H. Kim),박평원(P. W. Park),이택민(T. M. Lee),이경우(K. W. Lee) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this study, bender type PZT actuator which is used for control the pilot pressure and is applicated to the electro-pneumatic regulator was studied. Also, two PZT pilot valve for proportional pressure control were suggested and PWM control strategy for the hysteresis improvement was attempted. Experiments for the new control mechanism of. the electro-pneumatic regulator were operated under the input condition of 0.1[㎫] and it was confirmed that this mechanism has a good control characteristics to the response sensitivity and hysteresis.
윤소남(S. N. Yun),김찬용(C. Y. Kim),박평원(P. W. Park),정용현(Y. H. Jung) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Gas valve for domestic use is used for flow control of LPG(Liquefied Petroleum Gas) or LNG(Liquefied Natural Gas) of which pressure is about 200mmH₂O(?0.0196 [bar]). Currently, two kinds of valves such as rotary type and button type are widely used in many applications. But, these valves have some problems that they are not controllable and reliable. Piezo actuation combined with modern microelectronics provides a reliable, quiet, low energy, infinitely adjustable gas valve. In this paper, gas valve using piezo actuator which are bimorph and a circle type was studied. Also, Prototype for gas valve was manufactured and characteristics of the prototype gas valve were analyzed.
윤소남(S. Yun),김찬용(C. Y. Kim),박평원(P. Y. Park),이충국(C. K. Lee) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The purpose of this paper is to improve the hysteresis characteristics of a stack type piezoelectric actuator using system identification and tracking control. Recently, several printing methods that cost less and are faster than previous semiconductor processes have been developed for the production of electric paper and RFID. The system proposed in this study prints by spraying the molten metal, and consists of a nozzle, heating furnace, operating actuator, and an XYZ 3-axis stage, As an operating system, the piezoelectric(PZT) method has very valuable uses. However, the PZT actuator has a very big hysteresis characteristic due to the ferroelectric characteristics of the PZT element. This causes problems in the system position control characteristics and deteriorates the performance of the system. In this study, an investigation was conducted to improve the hysteresis characteristics of the PZT actuator that has an output displacement for the input voltage. The study proposed a inverse hysteresis model, a mathematic modeling method that can express the geometric relationship between voltage and displacement, in order to reduce the hysteresis of the PZT actuator. In addition, system identification and PID control methods were examined. Also, it was confirmed that the proposed control strategy gives good tracking performance.
윤소남 (S. N. Yun ),함영복 (Y. B. Ham ),박평원 (P. W. Park ) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
This paper presents a electro-pneumatic regulator with two PZT microvalves. Solenoid actuator method for automatic control of input pressure is widely used but this actuator has a high power consumption characteristics and attraction force depends on the coil temperature. So new actuator is required for constant pressure regulating and for energy saving. In this study, PZT actuator for the pressure control was fabricated and experimented instead of the conventional type solenoid actuator. Experiments for the new control mechanism of the electro-pneumatic regulator were operated under the input condition of 500[lpm] and 0.5[MPa] and it was confirmed that this mechanism has a good control characteristics to the response sensitivity and hysteresis.