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Fully Suspended, Five-Axis, Three-Magnetic-Bearing Dynamic Spin Rig with Forced Excitation (Paperback)
Loot Price: R429
Discovery Miles 4 290
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Fully Suspended, Five-Axis, Three-Magnetic-Bearing Dynamic Spin Rig with Forced Excitation (Paperback)
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Loot Price R429
Discovery Miles 4 290
Expected to ship within 10 - 15 working days
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The Five-Axis, Three-Magnetic-Bearing Dynamic Spin Rig, a
significant advancement in the Dynamic Spin Rig (DSR), is used to
perform vibration tests of turbomachinery blades and components
under rotating and nonrotating conditions in a vacuum. The rig has
as its critical components three magnetic bearings: two heteropolar
radial active magnetic bearings and a magnetic thrust bearing. The
bearing configuration allows full vertical rotor magnetic
suspension along with a feed-forward control feature, which will
enable the excitation of various natural blade modes in bladed disk
test articles. The theoretical, mechanical, electrical, and
electronic aspects of the rig are discussed. Also presented are the
forced-excitation results of a fully levitated, rotating and
nonrotating, unbladed rotor and a fully levitated, rotating and
nonrotating, bladed rotor in which a pair of blades was arranged
180 degrees apart from each other. These tests include the bounce
mode excitation of the rotor in which the rotor was excited at the
blade natural frequency of 144 Hz. The rotor natural mode frequency
of 355 Hz was discerned from the plot of acceleration versus
frequency. For nonrotating blades, a blade-tip excitation amplitude
of approximately 100 g/A was achieved at the first-bending critical
(approximately 144 Hz) and at the first-torsional and
second-bending blade modes. A blade-tip displacement of 70 mils was
achieved at the first-bending critical by exciting the blades at a
forced-excitation phase angle of 908 relative to the vertical plane
containing the blades while simultaneously rotating the shaft at
3000 rpm.
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