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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.