Electrorheological dampers .1. Analysis and design
Gavin HP, Hanson RD, Filisko FE
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
63 (3): 669-675 SEP 1996


Abstract:
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.

KeyWords Plus:
FLUID, SUSPENSIONS, MECHANISMS, RHEOLOGY

Addresses:
Gavin HP, DUKE UNIV,DEPT CIVIL & ENVIRONM ENGN,DURHAM,NC 27708
FEMA,DISASTER FIELD OFF,PASADENA,CA 91102
UNIV MICHIGAN,DEPT MAT SCI & ENGN,ANN ARBOR,MI 48109

Publisher:
ASME-AMER SOC MECHANICAL ENG, NEW YORK

IDS Number:
VL348

ISSN:
0021-8936