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...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
1997-01-01
|
| Series: | International Journal of Rotating Machinery |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1155/S1023621X97000079 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850227032882937856 |
|---|---|
| author | Siyoul Jang John A. Tichy |
| author_facet | Siyoul Jang John A. Tichy |
| author_sort | Siyoul Jang |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-55ce95e064104911bc4ff8264b4926f6 |
| institution | OA Journals |
| issn | 1023-621X |
| language | English |
| publishDate | 1997-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-55ce95e064104911bc4ff8264b4926f62025-08-20T02:04:55ZengWileyInternational Journal of Rotating Machinery1023-621X1997-01-0131617110.1155/S1023621X97000079Internal Damper Characteristics of Rotor System with Submerged ER Fluid Journal BearingSiyoul Jang0John A. Tichy1Lab. for Manufacturing and Productivity, Massachusetts Institute of Technology, Cambridge 02139, MA, USADept. of Mechanical Engineering & Mechanics, and Aeronautical Engineering, Rensselaer Polytechnic Institute, Troy 12180-3590, NY, USAElectro-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.http://dx.doi.org/10.1155/S1023621X97000079Electro-Rheological FluidDynamic CoefficientReynolds' EquationBingham FluidSwitch FunctionRotor-Bearing System Stability. |
| spellingShingle | Siyoul Jang John A. Tichy Internal Damper Characteristics of Rotor System with Submerged ER Fluid Journal Bearing International Journal of Rotating Machinery Electro-Rheological Fluid Dynamic Coefficient Reynolds' Equation Bingham Fluid Switch Function Rotor-Bearing System Stability. |
| title | Internal Damper Characteristics of Rotor System with
Submerged ER Fluid Journal Bearing |
| title_full | Internal Damper Characteristics of Rotor System with
Submerged ER Fluid Journal Bearing |
| title_fullStr | Internal Damper Characteristics of Rotor System with
Submerged ER Fluid Journal Bearing |
| title_full_unstemmed | Internal Damper Characteristics of Rotor System with
Submerged ER Fluid Journal Bearing |
| title_short | Internal Damper Characteristics of Rotor System with
Submerged ER Fluid Journal Bearing |
| title_sort | internal damper characteristics of rotor system with submerged er fluid journal bearing |
| topic | Electro-Rheological Fluid Dynamic Coefficient Reynolds' Equation Bingham Fluid Switch Function Rotor-Bearing System Stability. |
| url | http://dx.doi.org/10.1155/S1023621X97000079 |
| work_keys_str_mv | AT siyouljang internaldampercharacteristicsofrotorsystemwithsubmergederfluidjournalbearing AT johnatichy internaldampercharacteristicsofrotorsystemwithsubmergederfluidjournalbearing |