Abstract
Magnetorheological fluids are smart materials, which are responsive to the external stimulus and changes their rheological properties. The damper performance (damping force) is dependent on the magnetic flux density induced at the annular gap. Magnetic flux density developed at fluid flow gap of MR damper due to external applied current is also dependent on materials properties of components of MR damper (such as piston head, outer cylinder and piston rod). The present paper discus about the influence of different materials selected for components of the MR damper on magnetic effect using magnetostatic analysis. Different materials such as magnetic and low carbon steels are considered for piston head of the MR damper and magnetic flux density induced at fluid flow gap (filled with MR fluid) is computed for different DC current applied to the electromagnetic coil. Developed magnetic flux is used for calculating the damper force using analytical method for each case. The low carbon steel has higher magnetic permeability hence maximum magnetic flux could pass through the piston head, which leads to higher value of magnetic effect induction at the annular gap. From the analysis results it is observed that the magnetic steel and low carbon steel piston head provided maximum magnetic flux density. Eventually the higher damping force can be observed for same case.
Highlights
The magnetorheological dampers are smart devices, whose damping force can be varied upon a change in the current
The MR damper force is highly influenced by the amount of magnetic flux induced in the MR damper due to the current supplied to the electromagnetic coil
Three different materials were considered as the material for piston head viz., M36, SA1020 and SST 430
Summary
The magnetorheological dampers are smart devices, whose damping force can be varied upon a change in the current. Nguyen et al (2008) [1] developed a novel optimization method based on finite element analysis to compute the optimal parameters. Zhang et al (2006) [2] developed a method to design the MR damper constructed on the magnetic design through FE analysis. The effect of different piston configurations such as geometric features, shape and size on the damping force was investigated. Paul et al (2014) [6] presented an investigation on characteristics of MR fluid and its effect on the MR damper through commercially available FE software and the analysis results obtained were validated with the experimental results. The variation in the damper performance due to usage of different materials for the piston head is investigated
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