이중 선형 감쇠특성을 갖는 새로운 형태의 MR 댐퍼 설계 및 해석

초록

In this study, we propose a novel MR damper with bilinear damping characteristics realized through open-loop control alone. The bilinear damping characteristics are a high damping coefficient at low stroke speed and a low damping coefficient at high stroke speed. This is possible since the damping coefficient is drastically changed by the slope breaking point. The proposed MR damper consists of a main orifice and a bypass orifice, which are activated independently. Unlike conventional MR dampers, the proposed MR damper retains a specific pole shape in the main orifice. Therefore, the effective area of the orifice is controllable through the manipulation of the magnetic field to the main orifice, resulting in control of the damping coefficient. In addition, by controlling the opening or closing of the bypass orifice, drastic changes in the damping coefficient are realized. For validation, mathematical modeling of the proposed MR damper is performed considering the pole shape function and slope breaking point. Subsequently, the damping force controllability with bilinear damping characteristics is analyzed as a function of magnetic field intensity.

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