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윤소남,김형의,Yun, So-Nam,Kim, Hyeong-Ui 한국기계연구원 1990 기계연구원소보 Vol.20 No.-
A counter balance valve is used as one part of hydraulic motor brake system. The function of this valve is to protect over-run or free falling of inertia load. But occasionally the brake system with counter balance valve makes some undesirable problems such as pressure surges or vibrations. In this study, for the purpose of easy estimation about dynamic chrcteristics of hydraulic system including counter balance valve, precise formulation describing fluid dynamics and valve dynamics under various boundary conditions were made. dynamic caracteristics were analysed by numerical intergration using Runge-Kutta method, because the equations in this circuit with counter balance valve contain various nonlinear terms. So the analyzing method developed in this study enabled very easy estimating the relation between the performance of counter balance valve and various physical parameters related to the valve.
윤소남,함영복,윤석진,김찬용,이경우 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.11
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,김찬용,함영복,윤석진,이경우,Yun, So-Nam,Kim, Chan-Yong,Ham, Young-Bog,Yoon, Seok-Jin,Lee, Kyung-Woo 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.11
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 $200\;mmH_{2}O(\fallingdotseq0.0196\;[bar])$. 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 modem 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,김찬용,서우석,박중호,함영복 사단법인 유공압건설기계학회 2006 드라이브·컨트롤 Vol.3 No.2
The pressure regulator which is used for controlling the reducing pressure in the piezoelectrically driven pneumatic valve has been studied. The pneumatic valve of this study object is 2-stage type and consists of a piezoelectric actuator, a controller, a poppet valve and a pressure regulator. Nominal flow of 50 1pm, maximum operating pressure of 0.9MPa and frequency characteristic of 10Hz and over are required in this pneumatic valve, but the pressure regulator is needed because piezoelectric actuator has no ability to control the pressure of 0.9MPa directly. In this study, bimorph type PZT actuator of 25.2 mm(L)x7.2 mm(W)x0.5 mm(H) with constant of -220x10-12 CN-1 was proposed and investigated. Maximum operating force of 0.052 N and maximum displacement of 63 ㎛ were gotten from the fabricated PZT actuator. From the analysis results, the orifice diameter or 0.6mm for a piezoelectric actuator was derived and then the pressure regulator which can be operated under 0.15 MPa easily was designed and manufactured. Performance and effects of design parameters were simulated by the Simulink of Matlab software, and it was confirmed that the performance characteristics of manufactured pressure regulator are superior in the common use pressure of 0.5 MPa to 0.7MPa, The results show that the proposed pressure regulator is suitable for the pneumatic valve with a PZT actuator.