Natural Frequncies of Coupled Blade-Bending and Shaft-Torsional Vibrations
In this study, the coupled shaft-torsional and blade-bending natural frequencies are investigated using a reduced order mathematical model. The system-coupled model is developed using the Lagrangian approach in conjunction with the assumed modes method to discretize the blade bending deflection. The...
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| Format: | Article |
| Language: | English |
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Wiley
2007-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2007/506165 |
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| author | B.O. Al-Bedoor |
| author_facet | B.O. Al-Bedoor |
| author_sort | B.O. Al-Bedoor |
| collection | DOAJ |
| description | In this study, the coupled shaft-torsional and blade-bending natural frequencies are investigated using a reduced order mathematical model. The system-coupled model is developed using the Lagrangian approach in conjunction with the assumed modes method to discretize the blade bending deflection. The model accounts for the blade stagger (setting) angle, the system rotating speed and its induced stiffening effect. The coupled equations of motion are linearized based on the small deformation theory for the blade bending and shaft torsional deformation to enable calculation of the system natural frequencies for various combinations of system parameters. The obtained coupled eignvalue system is ready for use as a reference for comparison for larger size finite element simulations and for the use as a fast check on natural frequencies for the coupled blade bending and shaft torsional vibrations in the design and diagnostics processes. Some results on the predicted natural frequencies are graphically presented and discussed pertinent to the coupling controlling factors and their effects. In addition, the predicted coupled natural frequencies are validated using the Finite Element Commercial Package (Pro-Mechanica) where good agreements are found. |
| format | Article |
| id | doaj-art-8c25485839aa491786c123672ecae941 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2007-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-8c25485839aa491786c123672ecae9412025-02-03T05:59:47ZengWileyShock and Vibration1070-96221875-92032007-01-01141658010.1155/2007/506165Natural Frequncies of Coupled Blade-Bending and Shaft-Torsional VibrationsB.O. Al-Bedoor0Mechanical Engineering Department, Faculty of Engineering and Technology, University of Jordan, P.O. Box 13568, Amman 11942, JordanIn this study, the coupled shaft-torsional and blade-bending natural frequencies are investigated using a reduced order mathematical model. The system-coupled model is developed using the Lagrangian approach in conjunction with the assumed modes method to discretize the blade bending deflection. The model accounts for the blade stagger (setting) angle, the system rotating speed and its induced stiffening effect. The coupled equations of motion are linearized based on the small deformation theory for the blade bending and shaft torsional deformation to enable calculation of the system natural frequencies for various combinations of system parameters. The obtained coupled eignvalue system is ready for use as a reference for comparison for larger size finite element simulations and for the use as a fast check on natural frequencies for the coupled blade bending and shaft torsional vibrations in the design and diagnostics processes. Some results on the predicted natural frequencies are graphically presented and discussed pertinent to the coupling controlling factors and their effects. In addition, the predicted coupled natural frequencies are validated using the Finite Element Commercial Package (Pro-Mechanica) where good agreements are found.http://dx.doi.org/10.1155/2007/506165 |
| spellingShingle | B.O. Al-Bedoor Natural Frequncies of Coupled Blade-Bending and Shaft-Torsional Vibrations Shock and Vibration |
| title | Natural Frequncies of Coupled Blade-Bending and Shaft-Torsional Vibrations |
| title_full | Natural Frequncies of Coupled Blade-Bending and Shaft-Torsional Vibrations |
| title_fullStr | Natural Frequncies of Coupled Blade-Bending and Shaft-Torsional Vibrations |
| title_full_unstemmed | Natural Frequncies of Coupled Blade-Bending and Shaft-Torsional Vibrations |
| title_short | Natural Frequncies of Coupled Blade-Bending and Shaft-Torsional Vibrations |
| title_sort | natural frequncies of coupled blade bending and shaft torsional vibrations |
| url | http://dx.doi.org/10.1155/2007/506165 |
| work_keys_str_mv | AT boalbedoor naturalfrequnciesofcoupledbladebendingandshafttorsionalvibrations |