Free transverse vibration of rotating blades in a bladed disk assembly |
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Authors: | R Luo |
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Affiliation: | 1.MI Group, Blading Department,Alstom Power,Rugby,UK |
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Abstract: | This paper investigates the natural frequency of free transverse vibration of blades in rotating disks to examine the relationship
of natural frequencies, blade stiffness and nodal diameters to study how neighboring blades react upon each other and affect
blade natural frequency. With the use of elastic hinge theory and a cantilever beam model subjected to either a transverse
concentrated force or a bending moment at the free end, the force-deflection stiffness/moment-rotation stiffness of the beam
have been developed. Thereafter, the reaction forces and moments from the neighboring blades have been determined without
the need for an exact solution of large deformation of cantilever beams including geometrical nonlinearity effects. With the
use of the energy conservation principle and modal theory, the natural frequency of free transverse vibration of blades in
rotating disks has been determined for any nodal diameter. A comparison of the analytical and finite element solutions for
a bladed disk with uniform aerofoils shows that the analytical method presented in this paper is accurate. |
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