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The effect of the diameter of ferromagnetic particles on the performance of MR dampers used in automobiles is analyzed in this study. A magnetorheological fluid (MRF) is used in the MR damper that means its resistance increases as a magnetic field produced by an electric current advance in the coil. It is evident from the experiments that ferromagnetic particles added to the MRF greatly reduce the vertical shift of the piston. When electricity from the wire is introduced, the displacement, velocity and acceleration of the piston drop. This means the magnetic field increases the fluid’s viscosity and, therefore, better helps the vibration damping. Besides, particle size was changed from 250 µm to 125 µm, showing that a smaller particle helped the damper function better. Lower particle sizes increased the fluid’s thickness, making the piston work against resistance and reducing its speed. As the size of the particles went from 175 µm to 125 µm, the Ride Comfort Level (RCL) improved by a large amount, falling from 114.2 dB down to 106.23 dB. Results of this study indicate that tiny ferromagnetic particles in the MR fluid yield better damping, better vibration damping, better ride comfort and improved suspension function. According to the data, the particle size is essential for maintaining the right balance between noise suppression and a convenient ride for those inside the car.
