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박명관,이은준,오시마 슈조,야마네 류이치로,Park, Myeong-Kwan,Rhee, Eun-Jun,Oshima, Shuzo,Yamane, Ryuichiro 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.7
The purpose of present research was to get characteristics and basic knowledges of electrorheological(ER) suspension. To observe behaviors of the ER suspensions. transparent conductive plates were used to visualize the flow of ER suspensions between two parallel plate electrodes. The influence of flowing speed and intensity of electric field on the ER fluid were examined in circle-shaped electric field, and it takes several hundred milliseconds that suspensions in flow cluster. The present study also conducts a numerical analysis adopting the Bingham model. It is found that simple Bingham model can not property describe the flow behavior in the parallel plates.
전자기력에 의한 자성유체의 자유표면 형성 및 상승높이 제어에 관한 연구
이은준,신진오,박명관,Lee, Eun-Jun,Shin, Jin-Oh,Park, Myeong-Kwan 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.12
In this paper, the investigation about the elevation control and the formation of the free surface of magnetic fluids is carried out theoretically and experimentally on the basis of magnetic fluids is carried out theoretically and experimentally on the basis of Rosensweig' Ferrohydrodynamic Bernoulli Equation. Governing equations of magnetic fields are solved using the concept of vector potential. While applied magnetic fields are induced by 4$\times$4 electromagnet located under the magnetic fluid, the fee surface of the magnetic fluid is formed the balance of surface force, gravity, pressure difference, magnetic normal pressure and magnetic body force. The results of numerical simulation and experiment show the formation of the free surface of the magnetic fluid. Using PID control, an experiment for the elevation control of the free surface of magnetic fluids is performed.
남윤주(Yun-Joo Nam),박명관(Myeong-Kwan Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
This paper is concerned with an electromagnetic design methodology for the magneto-rheological (MR) damper. In order to improve the performance of the MR damper, the magnetic field should be effectively supplied to the MR fluid. Therefore, it is important that magnetic circuit consisting of the MR fluid, the ferromagnetic material for magnetic flux path, and the electromagnetic coil is well designed. For this purpose, two effective approaches are proposed: one is to shorten the magnetic flux path by removing the unnecessary bulk of the yoke in order to improve the static characteristic of the MR damper, and the other is to increase the magnetic reluctance of the ferromagnetic material by minimizing its cross-sectional area through which the magnetic flux passes in order to improve the dynamic and hysteretic characteristics. The effectiveness of the proposed design methodology is verified through magnetic analysis and a series of basic experiments.
남윤주(Yun-Joo Nam),박명관(Myeong-Kwan Park) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The pressure pulsation due to the gear geometry of the gerotor (generalized rotor) pump mainly occurs in the instant that the chamber of the gerotor leaves from the suction port and enters the delivery one. Such a pressure pulsation may result in the undesirable vibration and noise of the pump components as well as the cavitation in the hydraulic system. Therefore, it is very important to examine the pressure characteristic of the gerotor pump at its design and analysis stages. In this paper, in order to reduce the pressure pulsation in the gerotor pump, the port plate with the relief grooves is designed by referring to as the notch of the vane pumps and the relief groove of the piston pumps. A series of the theoretical analyses on the pressure pulsation are performed in consideration of various design parameters of the port plate including the installation positions of the port inlet/outlet and the groove width.
[차량운동성능] 차량용 반능동 ER댐퍼의 스카이훅 제어
이육형(Yuk Hyung Lee),박명관(Myeong Kwan Park) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
In this paper, skyhook control of a semi-active ER(Electro-Rheological) damper for vehicles is investigated. The strength of the ER damper is controlled by a high voltage power supply. This paper deals with a two-degree-of-freedom suspension using the damper with ERF for a quarter vehicle system. The control law for semi-active suspensions modeled in this study is developed using skyhook and Linear Quadratic Regulator(LQR) optimal control method. Computer simulation and experimental results show that the semi-active suspension with ERF damper has good performances of ride quality.