Internal Damper Characteristics of Rotor System with Submerged ER Fluid Journal Bearing
Electro-Rheological (ER) fluid behavior is similar to Bingham fluid’ s. Only when the shear stress magnitude of ER fluid exceeds the yield stress, Newtonian flow results. Continuous shear strain rate equation about shear stress which simulates Bingham-like fluid shows viscosity variations. Shear yie...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
1997-01-01
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| Series: | International Journal of Rotating Machinery |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1155/S1023621X97000079 |
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| Summary: | Electro-Rheological (ER) fluid behavior is similar to Bingham fluid’ s. Only when the shear
stress magnitude of ER fluid exceeds the yield stress, Newtonian flow results. Continuous
shear strain rate equation about shear stress which simulates Bingham-like fluid shows
viscosity variations. Shear yield stress is controlled by electric fields. Electric fields in
circumferential direction around the journal are also changeable because of gap distance.
These values make changes of spring and damping coefficients of journal bearings compared
to Newtonian flow case. Implicit viscosity variation effects according to shear strain rates of
fluid are included in generalized Reynolds' equation for submerged journal bearing. Fluid
film pressure and perturbation pressures are solved using switch function of Elord's algorithm
for cavitation boundary condition. Spring and damping coefficients are obtained for
several parameters that determine the characteristics of ER fluids under a certain electric
field. From these values stability region for simple rotor-bearing system is computed. It is
found that there are no big differences in load capacities with the selected electric field
parameters at low eccentric region and higher electric field can support more load with
stability at low eccentric region. |
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| ISSN: | 1023-621X |