Abstract:
A semi- active control based on the magneto rheological (MR) damper is presented. The system includes four key parts: a rack and pinion mechanism, linear permanent magnet DC generator, a current adjustment MR damper, and control circuit. Semi active control devices have received significant attention in recent years because they offer the adaptability of active control devices without requiring the associated large power sources. Magneto rheological (MR) dampers are semi active control devices that use MR fluids to produce controllable dampers. The advantage of MR dampers is over conventional dampers are they are simple in construction, compromise between high frequency isolation and natural frequency isolation, they offer semi-active control, have very quickly response. Magneto rheological fluids controllable fluids belonging to the class of active materials that have a unique ability to change the dynamic to change dynamic yield stress when acted upon by an electric or magnetic field, while maintaining viscosity relatively constant. This property can be utilised in MR damper where the damping force is changed by changing the rheological properties of fluid magnetically. The objective of the project to study the application of MR damper to vibration control, design the vibration damper using MR fluids, test and evaluate its performance. In this project the rheology and the theory behind MR fluids and the theory on vibration control were studied.
Keywords: MR damper, Energy regeneration, DC motor, Semi-active control.
