Shock and Vibration

Shock and Vibration / 2007 / Article

Open Access

Volume 14 |Article ID 506165 | https://doi.org/10.1155/2007/506165

B.O. Al-Bedoor, "Natural Frequncies of Coupled Blade-Bending and Shaft-Torsional Vibrations", Shock and Vibration, vol. 14, Article ID 506165, 16 pages, 2007. https://doi.org/10.1155/2007/506165

Natural Frequncies of Coupled Blade-Bending and Shaft-Torsional Vibrations

Received11 Jun 2005
Revised19 Jan 2006

Abstract

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.

Copyright © 2007 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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