Electrorheological dampers, Part I: Analysis and design

Journal Article

Electrorheological (ER) materials are suspensions of specialized, micron-sized particles in nonconducting oils. When electric fields are applied to ER materials, they exhibit dramatic changes (within milli-seconds) in material properties. Pre-yield, yielding, and post-yield mechanisms are all influenced by the electric field. Namely, an applied electric field dramatically increases the stiffness and energy dissipation properties of these materials. A previously known cubic equation which describes the flow of fluids with a yield stress through a rectangular duct can be applied to annular flow, provided that certain conditions on the material properties are satisfied. An analytic solution and a uniform approximation to the solution, for the rectangular duct Poiseuille flow case is presented. A numerical method is required to solve the flow in annular geometries. The approximation for rectangular ducts is extended to deal with the annular duct case.

Duke Authors

Cited Authors

  • Gavin, HP; Hanson, RD; Filisko, FE

Published Date

  • 1996

Published In

Volume / Issue

  • 63 / 3

Start / End Page

  • 669 - 675

International Standard Serial Number (ISSN)

  • 0021-8936