Abstract

To obtain a good ride quality and smooth car body motion, many studies have focused on the damper. Passive dampers are unable to respond actively to changes in the environment; hence many studies are being conducted on semi-active dampers that use magnetorheological (MR) fluids. As the damping characteristics of the MR damper, such as the response time, control gain, and gradient of the damping force curve, can significantly affect the control performance of the vehicle, the damping characteristics of the MR damper should be carefully considered. Accordingly, in this study, we developed a method for selecting the damping characteristics of an MR damper for specific vehicle types and analyze the relation between the dynamic characteristics of MR damper and driving performances. To achieve this objective, we demonstrated that the damping characteristics can be tuned according to the additional flow path, groove, and core material. To confirm the enhancement of the ride quality, vibration control performance, and steering stability, the skyhook controller was considered. Since we obtained the suitable damping characteristics that met the requirements under random road profiles and bumpy roads, the realization of these characteristics will enable us to satisfy the driving requirements.

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