Loading...
Please wait, while we are loading the content...
Similar Documents
Stabilizing gyroscopic modes in magnetic-bearing-supported flywheels by using cross-axis proportional gains
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Duffy, Kirsten P. Jansen, Ralph H. Brown, Gerald V. Kascak, Albert F. Dever, Timothy P. |
| Copyright Year | 2006 |
| Description | For magnetic-bearing-supported high-speed rotating machines with significant gyroscopic effects, it is necessary to stabilize forward and backward tilt whirling modes. Instability or low damping of these modes can prevent the attainment of desired shaft speed. We show analytically that both modes can be stabilized by using cross-axis proportional gains and high- and low-pass filters in the magnetic bearing controller. Furthermore, at high shaft speeds, where system phase lags degrade the stability of the forward-whirl mode, a phasor advance of the control signal can partially counteract the phase lag. In some range of high shaft speed, the derivative gain for the tilt modes (essential for stability for slowly rotating shafts) can be removed entirely. We show analytically how the tilt eigenvalues depend on shaft speed and on various controller feedback parameters. |
| File Size | 430618 |
| Page Count | 22 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20060008913 |
| Archival Resource Key | ark:/13960/t2f81b33f |
| Language | English |
| Publisher Date | 2006-01-01 |
| Access Restriction | Open |
| Subject Keyword | Mechanical Engineering Stability Proportional Control Low Pass Filters Feedback Bandwidth Eigenvalues Frequency Distribution Magnetic Bearings Gyroscopes Flywheels Shafts Machine Elements Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
