Loading...
Please wait, while we are loading the content...
Similar Documents
Whirl motion of a seal test rig with squeeze-film dampers
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Gunter, Edgar J. Proctor, Margaret P. |
| Copyright Year | 2007 |
| Description | This paper presents the experimental behavior and dynamic analysis of a high speed test rig with rolling element bearings mounted in squeeze film oil damper bearings. The test rotor is a double overhung configuration with rolling element ball bearings mounted in uncentered squeeze-film oil dampers. The damper design is similar to that employed with various high-speed aircraft HP gas turbines. The dynamic performance of the test rig with the originally installed dampers with an effective damper length of length 0.23-inch was unacceptable. The design speed of 40,000 RPM could not be safely achieved as nonsynchronous whirling at the overhung seal test disk and high amplitude critical speed response at the drive spline section occurred at 32,000 RPM. In addition to the self excited stability and critical speed problems, it was later seen from FFT data analysis, that a region of supersynchronous dead band whirling occurs between 10,000 to 15,000 RPM which can lead to bearing distress and wear. The system was analyzed using both linear and nonlinear techniques. The extended length damper design resulting from the analysis eliminated the rotor subsynchronous whirling, high amplitude critical speed, and the dead band whirling region allowing the system to achieve a speed of 45,000 RPM. However, nonlinear analysis shows that damper lockup could occur with high rotor unbalance at 33,000 RPM, even with the extended squeeze-film dampers. The control of damper lockup will be addressed in a future paper. |
| File Size | 8018795 |
| Page Count | 12 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20070031910 |
| Archival Resource Key | ark:/13960/t2f81b70s |
| Language | English |
| Publisher Date | 2007-06-19 |
| Access Restriction | Open |
| Subject Keyword | Mechanical Engineering Motion Transient Response Squeeze Films Ball Bearings Dampers Modal Response Gas Turbine Engines Rotor Speed Rotation Fast Fourier Transformations Rotor Dynamics Seals Stoppers Nonlinearity Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
