Multiphysics modeling of magnetorheological dampers

D Case, B Taheri, E Richer

Abstract


The dynamics of a small scale magnetorheological damper were modeled and analyzed using multiphysics commercial finite element software to couple the electromagnetic field distribution with the non-Newtonian fluid flow. The magnetic flux lines and field intensity generated within the damper and cyclic fluid flow in the damper under harmonic motion were simulated with the AC/DC and CFD physics modules of COMSOL Multiphysics, respectively. Coupling of the physics is achieved through a modified Bingham plastic definition, relating the fluid's dynamic viscosity to the intensity of the induced magnetic field. Good agreement is confirmed between simulation results and experimentally observed resistance forces in the damper. This study was conducted to determine the feasibility of utilizing magnetorheological dampers in a medical orthosis for pathological tremor attenuation. The implemented models are thus dimensioned on a relatively small scale. The method used, however, is not specific to the damper's size or geometry and can be extended to larger-scale devices with little or no complication.

Full Text:

PDF

References


D. J. Klingenberg, "Magnetorheology: Applications and challenges," AIChE Journal, vol. 47, no. 2, pp. 246-249, February 2001. CrossRef

G. Yang, B. F. Spencer Jr., J. D. Carlson, and M. K. Sain, "Large-scale mr fluid dampers: modeling and dynamic performance considerations." Engineering Structures, vol. 24, p. 309, 2002. CrossRef

J. Rosen, S. Burns, and J. Perry, "Upper-limb powered exoskeleton design," IEEE/ASME Transactions on Mechatronics, vol. 12, no. 4, pp. 408-417, 2007. CrossRef

H. Gurocak and J. Blake, "Haptic glove with MR brakes for virtual reality," IEEE/ASME Transactions on Mechatronics, vol. 14, no. 5, pp. 606-615, 2009. CrossRef

A. Shafer and M. Kermani, "On the feasibility and suitability of MR fluid clutches in human-friendly manipulators," IEEE/ASME Transactions on Mechatronics, vol. 16, no. 6, pp. 1073-1082, December 2011. CrossRef

D. Case, B. Taheri, and E. Richer, "Design and characterization of a small-scale magnetorheological damper for tremor suppression," IEEE/ASME Transactions on Mechatronics, vol. 18, no. 1, pp. 96-103, February 2013, doi: 10.1109/TMECH.2011.2151204. CrossRef

R. Ehrgott and S. Masri, "Modelling the oscillatory dynamic behavior of electrorheological materials in shear," Smart Materials and Structures, vol. 1, no. 4, pp. 275-285, 1992. CrossRef

B. Spencer Jr., S. Dyke, M. Sain, and J. Carlson, "Phenomenological model of a magnetorheological damper," ASCE Journal of Engineering Mechanics, vol. 123, no. 3, pp. 230-238, 1997. CrossRef

T. C. Papanastasiou, "Flow of materials with yield," Journal of Rheology, vol. 31, pp. 385-404, 1987. CrossRef

A. Taylor and S. Wilson, "Conduit flow of an incompressible yield stress fluid," Journal of Rheology, vol. 41, no. 1, pp. 93-101, 1997. CrossRef

G. Burgos, A. Alexandrou, and V. Entov, "On the determination of yield surfaces in herschelbulkley fluids," Journal of Rheology, vol. 43, no. 3, pp. 463-483, 1999. CrossRef

I. Frigaard and C. Nouar, "On the usage of viscosity regularization methods for visco-plastic fluid flow computation," Journal of Non-Newtonian Fluid Mechanics, vol. 127, pp. 1-26, 2005. CrossRef

M. Moyers-Gonzalez and I. Frigaard, "Numerical solution of duct flows of multiple visco-plastic fluids," Journal of Non-Newtonian Fluid Mechanics, vol. 122, pp. 227-241, 2004. CrossRef

R. Phillips, Engineering applications of fluids with a variable yield stress, Ph.D. dissertation, Berkeley, 1969.

G. M. Kamath, M. K. Hurt, and N. M. Wereley, "Analysis and testing of bingham plastic behavior in semi-active electrorheological fluid dampers," Smart Materials and Structures, vol. 5, pp. 576-590, 1996. CrossRef

J. G. Oldroyd, "A rational formulation of the equation of plastic flow for a Bingham solid," Proceedings of the Cambridge Philosophical Society, vol. 43, pp. 100-105, 1947. CrossRef

A. Cantelli, "Uniform flow of modified Bingham fluids in narrow cross sections," Journal of Hydraulic Engineering, vol. 135, no. 8, pp. 640-650, 2009 stress," Ph.D. dissertation, Berkeley, 1969.




DOI: http://dx.doi.org/10.1260/1750-9548.7.1.61

Copyright (c) 2016 The International Journal of Multiphysics