Effect of shrink fits on threshold speeds of rotordynamic instability /
The purpose of this thesis is to study the effect of shrink fits on the threshold speeds of rotor instability. Shrink or press fit components in built-up rotors are known sources of internal friction damping. The internal friction damping increases with speed, and becomes a destabilizing mechanism o...
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
2001.
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| Subjects: | |
| Online Access: | Link to OAK Trust copy |
| Summary: | The purpose of this thesis is to study the effect of shrink fits on the threshold speeds of rotor instability. Shrink or press fit components in built-up rotors are known sources of internal friction damping. The internal friction damping increases with speed, and becomes a destabilizing mechanism once the rotor speed exceeds its first critical speed. The main objective of this thesis is to find an improved procedure to accurately determine the correct numerical value of the internal friction damping for use in rotordynamic models. Tests show that the free-free rap tests yield a better way to obtain the numerical approximate values of the internal friction damping of built-up rotors. These results were verified by comparing the rotordynamic models with running tests. It was found that the internal friction damping increases with decreasing interference fit and with increasing rotor speed. The threshold speed of instability appears at low interference fits but not at tight fits. |
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| Item Description: | Vita. "Major subject: Mechanical Engineering". |
| Physical Description: | xvi, 120 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references (leaves 103-105). |