Magnetic Circuit Design and Multiphysics Analysis of a Novel MR Damper for Applications under High Velocity

Abstract

A novel magnetorheological (MR) damper with a multistage piston and independent input currents is designed and analyzed. The equivalent magnetic circuit model is investigated along with the relation between magnetic induction density in the working gap and input currents of the electromagnetic coils. Finite element method (FEM) is used to analyze the distribution of magnetic field through the MR fluid region. Considering the real situation, coupling equations are presented to analyze the electromagneticthermal-flow coupling problems. Software COMSOL is used to analyze the multiphysics, that is, electromagnetic, thermal dynamic, and fluid mechanic. A measurement index involving total damping force, dynamic range, and induction time needed for magnetic coil is put forward to evaluate the performance of the novel multistage MR damper. The simulation results show that it is promising for applications under high velocity and works better when more electromagnetic coils are applied with input currents separately. Besides, in order to reduce energy consumption, it is recommended to apply more electromagnetic coils with relative low currents based on the analysis of pressure drop along the annular gap.

Transient multi-physics analysis of a magnetorheological shock absorber with the inverse Jiles–Atherton hysteresis model

“…The test points (A-E) located along the centerline of the working gap are employed to monitor the local magnetic flux densities as shown in figure 8. The main geometric parameters of the four-coil MR damper are given in table 1 based on the previous work [32]. The assembly components of the manufactured MR absorber are shown in Figure 2.…”

Mathematical modeling and experimental evaluation of a prototype double-tube Magnetorheological damper

“…5, the distribution and magnitude of the field density, field intensity and magnetic flux are shown. It is noteworthy how choosing series or parallel winding depends upon the geometry of the control valve and the application of MR devices [57,58].…”

Analysis of the magnetic field for MR damper working in shear mode

“…• Amongst the variety of elements that ANSYS includes to represent the electromagnetic phenomenon, PLANE13 is taken to be the most apt element for our model because it is a 2-D quadrilateral coupled-field-solid containing four nodes (Zheng and Wang, 2014).…”