Comparison and Optimization of MRF Dampers Performance with Different Piston Coil Winding Orientation using COMSOL Multiphysics®

P. Singh[1], S. Panda[2]
[1]Indian Institute of Technology (BHU), Varanasi, India
[2]IIT (BHU), Varanasi, India
Published in 2019

Undesirable shocks and vibrations are a noteworthy issue in numerous human exercises and domains. Therefore, various damping techniques are used to minimise vibrations, can be classified as active, Semi-active and passive damping. The development of semi-actively controlled Magnetorheological fluid (MRF) dampers is among the most promising devices for automotive suspension, shock absorption systems for civil and military applications and medical purposes such as prosthetic limbs and orthosis. The MRF dampers offer swift variation in damping properties using minimal power requirement, make them ideal for efficiently suppress the vibration.

This study provides an experimental and simulation analysis of MRF dampers by using COMSOL Multiphysics® . The governing equations describing the electromagnetic field and fluid flow in the annular gap are solved numerically by using AC/DC and CFD modules respectively along with the moving mesh interface. A validation study is conducted for finite-element based COMSOL® model of a conventional single-coil based Magnetorheological damper, where the coil axis is usually superposed on the damper axis, and the inner cylindrical housing is part of the magnetic circuit.

This paper compares the performance of conventional two-stage piston MR damper, with a new approach, where in contrast to the conventional solutions, the coils are wound in a direction perpendicular to the damper axis. The purpose of this study to maximise the dynamic range of MRF Dampers in addition to keep a compact volume. The optimisation of parameters conducted for two types of MRF dampers, as mentioned earlier through parametric analysis. The results obtained from simulations show that by changing the orientation of the piston coil, the damping coefficient and dynamic range could be increased up to three times and 2.5 times, respectively.