Force measurements in magnetic bearings using fiber optic strain gauges /
This research follows the work done by Raymer (2001) on the same magnetic bearing test rig at the Turbomachinery Laboratory of Texas A&M University. Raymer (2001) basically proved that it is possible to employ the fiber optic strain gauge (FOSG) technology to measure forces in magnetic bearings...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
2002.
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| Summary: | This research follows the work done by Raymer (2001) on the same magnetic bearing test rig at the Turbomachinery Laboratory of Texas A&M University. Raymer (2001) basically proved that it is possible to employ the fiber optic strain gauge (FOSG) technology to measure forces in magnetic bearings with a higher level of accuracy compared to previous research works. The original calibration method of Raymer (2001) is used to better understand and quantify the beneficial effects of different compensations (temperature and jump) on force accuracy. Also, the positive effect of opposed FOSG measurements on the same axis is inspected. If measured forces have a frequency higher than 1 Hz, force accuracies in the order of 0.05% of magnetic bearing maximum load capacity are achieved with no limitations (inertia, eddy currents, saturation, hysteresis). Then, a new procedure is presented to make the calibration faster, easier, and more repeatable having the same force accuracy. An interesting comparison with the force measurements using a current-position formula is done showing the FOSG improvement in force accuracy at high frequencies. In particular, at low frequencies they are the same, while above 20 Hz the two measurements keep diverging. Moreover, rotordynamic measurements and simulations are performed to prove the great accuracy of the FOSGs at high frequencies and rotational speeds and to inspect the effects of rotor speed on the system dynamic flexibility transfer function, i.e., on its damping ratios and natural frequencies. A quick de-lamination discussion is also presented as well as its influence on force uncertainty and installation procedure. |
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| Item Description: | Vita. "Major subject: Mechanical Engineering". |
| Physical Description: | xvii, 95 leaves : illustrations ; 28 cm. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references (leaves 93-94). |