Torquewhirl - A theory to explain nonsynchronous whirling failures of rotors with high load torque
Numerous unexplained failures of rotating machinery by nosynchronous shaft whirling point to a possible driving mechanism or source of energy not identified by previously existing theory. A majority of these failures have been in machines characterized by overhung disks (or disks located close to o...
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| Format: | Article |
| Language: | English |
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Universidad del Zulia
2011-03-01
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| Series: | Revista Técnica de la Facultad de Ingeniería |
| Online Access: | https://www.produccioncientificaluz.org/index.php/tecnica/article/view/4573 |
| Summary: | Numerous unexplained failures of rotating machinery by nosynchronous shaft whirling point to a possible driving mechanism or source of energy not identified by previously existing theory. A majority of these failures have been in machines characterized by overhung disks (or disks located close to one end of a bearing span) and/or high horse power and load torque. This paper gives exact solutions to the nonlinear differential equations of motion for a rotor having both of these characteristics, and shows that high ratios of driving torque to damping can produce nonsynchronous whirling with destructively large amplitudes. Solutions are given for two cases: (1) viscous load torque and damping, and (2) load torque and damping proportional to the second power of velocity (aerodynamic case). Linearized coefficients for stability analyses are derived for a special case. Criteria are given for avoiding the torquewhirl condition.
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| ISSN: | 0254-0770 2477-9377 |