Time-dependent CFD and quasi-static analysis of magnetorheological fluid dampers with experimental validation

Magnetorheological (MR) dampers can be controlled effectively by a magnetic field and with minimum power requirement. Under the magnetic field, MR fluid behaves as a non-Newtonian fluid with controllable viscosity. Damper performance can be enhanced by getting to know better the non-Newtonian flow in the annular gap of piston head.In the study the non-Newtonian flow in the annular gap is investigated by a quasi-static analysis that enables to calculate plug thickness and damper force. Also CFD analysis of the MR damper is performed by using transient and deformed mesh to be able to simulate moving of piston head in the damper considering non-Newtonian regions. Results of the analyses have been compared to experimental data obtained from MR dampers manufactured for the study. Good agreement has been observed between experimental and analyses data. In addition, effects of stroke and velocity on the damper performance are examined in the study.

► This paper presents effect of piston velocity and stroke of MR damper on performance.
► CFD analysis is performed with transient and moving mesh to simulate piston motion.
► Non-Newtonian regions due to magnetic field are considered in the CFD model.
► A quasi-static model is proposed to calculate damper force and plug thickness.
► Three MR dampers are fabricated to confirm the quasi-static and CFD models.